Just Joined!

[Mike]

Hey everyone!

Just joined and wanted to let everyone know. I'm looking forward to
hearing different ways to fix electronics. Have had some bad luck
lately-with the xbox 360, my p2 and some cell phones!!

 

[Nicholas Bodley]

On Mon, 20 Jul 2009 15:30:19 -0700, Mike wrote:

Hey everyone!

Just joined and wanted to let everyone know. I'm looking forward to
hearing different ways to fix electronics. Have had some bad luck
lately-with the xbox 360, my p2 and some cell phones!!

Welcome!

Not sure what a P2 is, but the others are quite sophisticated.

Please take a good look (longer is better) at the Repair FAQ:
<http://www.repairfaq.org/>

How much technical knowledge do you have? (A trial question: How do you
connect a better DMM to measure current?)

It's also important to learn how not to damage what you're trying to fix.
Having worked in industry, I'm almost fanatical about wrist ground straps.

You seem to have the enthusiasm and desire, and that surely helps!

--
Nicabod =+= Waltham, Mass.
Who's been involved in electronics
in some way since 1942

 

[Arfa Daily]

On Mon, 20 Jul 2009 15:30:19 -0700, Mike wrote:

Hey everyone!

Just joined and wanted to let everyone know. I'm looking forward to
hearing different ways to fix electronics. Have had some bad luck
lately-with the xbox 360, my p2 and some cell phones!!

You don't really 'join' usenet newsgroups. They are not web-based moderated
forums. You just access any group you fancy, and go ahead and post questions
as a new thread, or append answers or comments to existing threads. It's
usually a good idea to check a group's FAQs, to see what is and what isn't
considered good practice and manners for that group.

That said, sci.electronics.repair is pretty tolerant, and has a good
collection of regular posters and contributors from a number of electronics
related disciplines, as well as many amateurs from a wide range of
backgrounds with skill levels from dabbler to accomplished tech.

A degree of off-topic subject discussion is tolerated as 'bar room chatter',
but usually only once a thread has been running for a while, and the central
issues have been thrashed to death

Oh, and remember that contributions to newsgroups are world wide, so be
careful how you phrase yourself. What might sound like a tongue in cheek
comment to you, might sound very offensive to the person it's directed at
....

Have fun, and don't be afraid to jump in. All (most !!) contributors are
very welcome.

Arfa

 

[Smitty Two]

In article <jun9m.81480$ay4.44045@newsfe27.ams2>,
"Arfa Daily" <arfa.daily@ntlworld.com> wrote:

You don't really 'join' usenet newsgroups. They are not web-based moderated
forums.

But they appear so to google groupers. Mike, use google to search out
the word "usenet." Once you've figured out where the hell you are, find
a way to get here other than through google's half-assed portal. Most
regulars here block all google groupies.

 

[Jeff Liebermann]

On Mon, 20 Jul 2009 15:30:19 -0700 (PDT), Mike
<michael.jmitchell5@gmail.com> wrote:

Hey everyone!

What would you do if everyone responded?

Just joined and wanted to let everyone know. I'm looking forward to
hearing different ways to fix electronics. Have had some bad luck
lately-with the xbox 360, my p2 and some cell phones!!

Join? One does not join a Usenet newsgroup. Perhaps "enlist" might
be a better term.

Well, there are many ways to fix electonics. My motto is "Learn By
Destroying". I've even registered the domain name. Basically, one
doesn't really understand how something works until after they've
destroyed it, and frantically attempted to repair it before the
spouse, customer, or owner finds out. Any method of destruction is
acceptable as real learning ocurrs only after the destruction.

Blaming bad luck on lack of repair success would be acceptable is the
repair industry operated like Las Vegas. This is not the case, so
luck only plays a small part. Undertanding, dilligence,
documentation, and knowing someone with a clue and a large parts
collection is far more important than luck.

The xbox 360 and some computah motherboards have problems with lousy
BGA soldering. There are several videos on YouTube showing how to
reflow the CPU. I use a hot air soldering iron and hot plate as shown
here:
<http://www.youtube.com/watch?v=ndeq6cAA8MY>
I also use an infra-red optical thermometer to monitor temperature.
There are other videos showing using a bottle cap with burning cotton
and alcohol. It works, but with with a very low batting average.

I guess the P2 is a PS2 or Playstation 2. (11th commandment.... Thou
shalt not abrev). There's plenty on the web on how to fix most
anything. For example:
<http://www.ps2repair.com/PS2.htm>
Use Google find more.

Cell phones are something I fix in my non-existent spare time. They're
usually quite easy, especially when most of the damage is mechanical.
If it moves, it breaks. However, the average life of a cell phone is
18 months and the cost of commodity cell phones is so low, that it's
often not worth fixing.
<http://802.11junk.com/jeffl/pics/office/slides/radio-mess.html>

Hopefully, I've given you enough clues so that you can destroy
electronics in a deliberate and organized manner. That should teach
you enough so that you're able to avoid old mistakes on the next
repair.

 

[Arfa Daily]

"Smitty Two" <prestwhich@earthlink.net> wrote in message
newsrestwhich-F36908.20261821072009@newsfarm.iad.highwinds-media.com...

In article <jun9m.81480$ay4.44045@newsfe27.ams2>,
"Arfa Daily" <arfa.daily@ntlworld.com> wrote:

You don't really 'join' usenet newsgroups. They are not web-based
moderated
forums.

But they appear so to google groupers. Mike, use google to search out
the word "usenet." Once you've figured out where the hell you are, find
a way to get here other than through google's half-assed portal. Most
regulars here block all google groupies.

Hi Smitty ! How's it going ? Yeah, you're right - I'd forgotton that and was
lazy enough not to check ... I've come across quite a few web-based forums
now, that 'tap into' usenet, without the members being aware that's what's
happening. Still, if a few of these replies find their way back, at least
some of the people might get the idea that there are much better ways to
access newsgroups ...

Arfa

 

[Smitty Two]

In article <F1A9m.73836$tU4.46654@newsfe19.ams2>,
"Arfa Daily" <arfa.daily@ntlworld.com> wrote:

"Smitty Two" <prestwhich@earthlink.net> wrote in message
newsrestwhich-F36908.20261821072009@newsfarm.iad.highwinds-media.com...
In article <jun9m.81480$ay4.44045@newsfe27.ams2>,
"Arfa Daily" <arfa.daily@ntlworld.com> wrote:

You don't really 'join' usenet newsgroups. They are not web-based
moderated
forums.

But they appear so to google groupers. Mike, use google to search out
the word "usenet." Once you've figured out where the hell you are, find
a way to get here other than through google's half-assed portal. Most
regulars here block all google groupies.

Hi Smitty ! How's it going ? Yeah, you're right - I'd forgotton that and was
lazy enough not to check ... I've come across quite a few web-based forums
now, that 'tap into' usenet, without the members being aware that's what's
happening. Still, if a few of these replies find their way back, at least
some of the people might get the idea that there are much better ways to
access newsgroups ...

Arfa

I'm waging a profane campaign against the web forums on another n.g.
It's not a "service" to their readers, it's just viral advertising. Many
of the posts are shills put up by the site's operator.

 

[Bob Larter]

Jeff Liebermann wrote:

Well, there are many ways to fix electonics. My motto is "Learn By
Destroying". I've even registered the domain name. Basically, one
doesn't really understand how something works until after they've
destroyed it, and frantically attempted to repair it before the
spouse, customer, or owner finds out.

<grin> I blew up my mother's TV when I was about 14 (I'd run a tap into
it for composite video, but it was a live-chassis unit - I'm sure you
can guess the failure mode...), & managed to fix it before she got home.
(Only a transistor & a few resistors, thank god.) Boy, was that
educational! Mind you, that was back in the days when TV's came with a
schematic.

Any method of destruction is
acceptable as real learning ocurrs only after the destruction.

Too true.


--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------

 

[Jeff Liebermann]

On Sat, 25 Jul 2009 23:32:00 +1000, Bob Larter <bobbylarter@gmail.com>
wrote:

Jeff Liebermann wrote:
Well, there are many ways to fix electonics. My motto is "Learn By
Destroying". I've even registered the domain name. Basically, one
doesn't really understand how something works until after they've
destroyed it, and frantically attempted to repair it before the
spouse, customer, or owner finds out.

grin> I blew up my mother's TV when I was about 14 (I'd run a tap into
it for composite video, but it was a live-chassis unit - I'm sure you
can guess the failure mode...), & managed to fix it before she got home.
(Only a transistor & a few resistors, thank god.) Boy, was that
educational! Mind you, that was back in the days when TV's came with a
schematic.

Huh? Transistors in a TV with an AC-DC power supply? I doubt it.
That was the case with some tube type TV's and of course, the classic
5 tube radio, but not xsitorized TV's.

Any method of destruction is
acceptable as real learning ocurrs only after the destruction.

Too true.

My first experience was not electronic in nature. I was about 12
years old. We had a wind up mechanical clock on the mantle which
caught my attention. I wanted to know what made it tick, literally.
When the main spring went "sprong!", I knew that I had seriously
erred. I attempted to repair the damage, with no useful results. The
best I could do was cram all the parts and screws back into the case,
and hope that nobody noticed. Unfortunately, the lack of clock hands
and the lack of ticking made it all too obvious that something was
amiss. I was duly interrogated by the parents, and after the usual
improbable lies failed badly, I confessed.

Prior to this incident, every time I destroyed something, my father
would do his best to repair the damage. Broken windows, broken toys,
broken furniture, etc. This time was different. He demanded that I
repair the clock, while he watched.

Every evening for perhaps 30 minutes (the limit of my attention span),
I would sit with the guts of the clock on the kitchen table, while my
father introduced me to the art of using small tools, deducing
function, puzzle theory, search for parts on the floor, and how a
clock should work. Invaluable advice was offered such as "if you
don't know how it works, you probably can't fix it". While I fumbled,
my father patiently watched, while sitting on his hands. When I later
asked why he was sitting on his hands, he replied to was to keep from
strangling me to relieve the frustration of watching my inept
fumbling.

I don't recall if I ever really fixed the clock. It was returned to
the mantle, but only ran erratically. We usually let it run down so
it wouldn't make so much noise.

After my first experience in "Learn by Destroying", as long as I put
it back together, it was perfectly acceptable to destroy things for no
better reason than to see how it worked. At one point, I applied the
process to rebuilding a 1960 Ford Falcon engine, in the driveway. It
took 4 months. This was also where I decided RTFM is a futile
exercise as the shop manual was nearly useless.

Such destruction and resurrection exercises are a basic requirement to
later obtaining expertise and proficiency in the repair and
engineering biz. I've met people that failed to has such childhood
experiences, that have 5 thumbs on each hand, and are unable to use
tools other than a hammer. Those that failed the "Learn by
Destroying" test, can become attorneys, programmers, and decision
manufacturers.


--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

 

[none]

Jeff Liebermann wrote:

On Sat, 25 Jul 2009 23:32:00 +1000, Bob Larter <bobbylarter@gmail.com
wrote:

Jeff Liebermann wrote:
Well, there are many ways to fix electonics. My motto is "Learn By
Destroying". I've even registered the domain name. Basically, one
doesn't really understand how something works until after they've
destroyed it, and frantically attempted to repair it before the
spouse, customer, or owner finds out.
grin> I blew up my mother's TV when I was about 14 (I'd run a tap into
it for composite video, but it was a live-chassis unit - I'm sure you
can guess the failure mode...), & managed to fix it before she got home.
(Only a transistor & a few resistors, thank god.) Boy, was that
educational! Mind you, that was back in the days when TV's came with a
schematic.

Huh? Transistors in a TV with an AC-DC power supply? I doubt it.
That was the case with some tube type TV's and of course, the classic
5 tube radio, but not xsitorized TV's.

Any method of destruction is
acceptable as real learning ocurrs only after the destruction.
Too true.

My first experience was not electronic in nature. I was about 12
years old. We had a wind up mechanical clock on the mantle which
caught my attention. I wanted to know what made it tick, literally.
When the main spring went "sprong!", I knew that I had seriously
erred. I attempted to repair the damage, with no useful results. The
best I could do was cram all the parts and screws back into the case,
and hope that nobody noticed. Unfortunately, the lack of clock hands
and the lack of ticking made it all too obvious that something was
amiss. I was duly interrogated by the parents, and after the usual
improbable lies failed badly, I confessed.

Prior to this incident, every time I destroyed something, my father
would do his best to repair the damage. Broken windows, broken toys,
broken furniture, etc. This time was different. He demanded that I
repair the clock, while he watched.

Every evening for perhaps 30 minutes (the limit of my attention span),
I would sit with the guts of the clock on the kitchen table, while my
father introduced me to the art of using small tools, deducing
function, puzzle theory, search for parts on the floor, and how a
clock should work. Invaluable advice was offered such as "if you
don't know how it works, you probably can't fix it". While I fumbled,
my father patiently watched, while sitting on his hands. When I later
asked why he was sitting on his hands, he replied to was to keep from
strangling me to relieve the frustration of watching my inept
fumbling.

I don't recall if I ever really fixed the clock. It was returned to
the mantle, but only ran erratically. We usually let it run down so
it wouldn't make so much noise.

After my first experience in "Learn by Destroying", as long as I put
it back together, it was perfectly acceptable to destroy things for no
better reason than to see how it worked. At one point, I applied the
process to rebuilding a 1960 Ford Falcon engine, in the driveway. It
took 4 months. This was also where I decided RTFM is a futile
exercise as the shop manual was nearly useless.

Such destruction and resurrection exercises are a basic requirement to
later obtaining expertise and proficiency in the repair and
engineering biz. I've met people that failed to has such childhood
experiences, that have 5 thumbs on each hand, and are unable to use
tools other than a hammer. Those that failed the "Learn by
Destroying" test, can become attorneys, programmers, and decision
manufacturers.


The first lesson is: "Don't take anything apart that you cannot put back

together". which is a subset of "Don't do what you cannot undo".

This lesson requires a good deal of "lab time".

Most of humanity seldom, if ever, learns this lesson.

 

[msg]

On Sat, 25 Jul 2009 23:32:00 +1000, Bob Larter <bobbylarter@gmail.com
wrote:

<snip>

grin> I blew up my mother's TV when I was about 14 (I'd run a tap into
it for composite video, but it was a live-chassis unit - I'm sure you
can guess the failure mode...), & managed to fix it before she got home.
(Only a transistor & a few resistors, thank god.) Boy, was that
educational! Mind you, that was back in the days when TV's came with a
schematic.

Jeff Liebermann wrote:

Huh? Transistors in a TV with an AC-DC power supply? I doubt it.
That was the case with some tube type TV's and of course, the classic
5 tube radio, but not xsitorized TV's.

Au contraire, mon ami; in 1979 I added a 75 video input connection
(BNC) to a Ward's branded 13 inch color set which did not have
a power transformer and I need to use an isolation transformer with
it when it was connected to a video source.

Michael

 

[msg]

On Sat, 25 Jul 2009 23:32:00 +1000, Bob Larter <bobbylarter@gmail.com
wrote:

<snip>

grin> I blew up my mother's TV when I was about 14 (I'd run a tap into it for composite video, but it was a live-chassis unit -
I'm sure you can guess the failure mode...), & managed to fix it before she got home. (Only a transistor & a few resistors, thank

god.) Boy, was that educational! Mind you, that was back in the days when TV's came with a schematic.

Jeff Liebermann wrote:

Huh? Transistors in a TV with an AC-DC power supply? I doubt it.
That was the case with some tube type TV's and of course, the classic
5 tube radio, but not xsitorized TV's.

Au contraire, mon ami; in 1979 I added a 75 video input connection
(BNC) to a Ward's branded 13 inch color set which did not have
a power transformer and I needed to use an isolation transformer with
it when it was connected to a video source (IIRC, it had a full wave
and not bridge rectifier, with one lead from the AC mains connected
to the chassis (through a filter)). I made the mistake of failing
to check AC plug polarity one time (without using the isolation
transformer) and got a nasty current loop through the video source
that fortunately only blew a fuse.

Michael

 

[Jeff Liebermann]

On Sat, 25 Jul 2009 10:10:30 -0700, none <""karls\"@(none)"> wrote:

The first lesson is: "Don't take anything apart that you cannot put back
together". which is a subset of "Don't do what you cannot undo".

The phrase "Learn by Destroying" implies that one learns something
from the exercise. Apparently, you haven't learned much. Fear of
disassembly is what prevents ordinary mortals from becoming competent
service personnel. I've dived into many contrivances, where I had no
clue as to what I was getting into, much less any clue what I was
doing. Sometimes, an astute customer will ask me "Have you ever done
this before"? Usually, my answer is no. Lack of expertise and prior
experience doesn't bother me. If I understand how it works, or is
suppose to work, I can usually figure out what's broken. I learn as I
go along. Lack of experience has never stopped me. However, I were
worried about reassembly, I probably wouldn't try to fix anything.

These days, I take digital photos of the disassembly, and organize the
screws so that I can replace them in the original location. I will
admit to having some difficulties putting Humpty Dumpty back together
again, but it's rare. I recent near disaster was replacing the batter
on an Apple iPod Touch 1G. Getting it apart is hell. Putting it back
together is worse. I eventually had to clamp the case together
between two pieces of wood, and apply excessive force with a pair of
vice grips. The risk of breaking the glass was rather high. If I had
known what was involved, I'm not sure if I would have attempted the
job. However, now that I know how it works, it's no big deal.

Anyway, at age 12, one would not expect anyone to know their own
limitations. After watching Superman on TV, I tried flying.

This lesson requires a good deal of "lab time".

Sure. Experience is a good teacher. However, reading the manual,
looking at the schematic, and understanding how it works, will
dramatically reduce the "lab time".

Most of humanity seldom, if ever, learns this lesson.

That's why I'm still in business. If the GUM (great unwashed masses)
had any interest in getting their hands dirty by tearing into their
toys, I would be looking for something else to do. I suspect this is
because of the ancient patrician attitude that the upper classes
should not have to deal with manual labor.

Incidentally, one the secrets to staying in business is the ability to
fix anything. Customers call me with computah problems. However,
when I arrive, it's not unusual to get involved in other electronic
failures. Phone, various audio/visual devices, cell phones,
appliances, garage door openers, and such are common repairs. For a
while, I was making more money dealing with printer problems than
computah.

However, last week, I hit the undo button. The customer called with a
problem with their ancient Konica copier. 500,000 pages and just
about everything is worn out. I've kept it alive by just keeping it
clean for about 15 years. So, I made a big show of tearing it apart,
proclaiming unsolvable difficulties, overestimating the damage, and
then hitting the undo button by returning it to its original
malfunctional state.

Also, I was seriously considering starting a "black list" of
manufacturers and products that are unusually difficult to disassemble
and/or repair, or are otherwise designed to discourage repair. It
probably won't help make things repairable, but it will highlight the
problem. Top of the list are the iPhone and iPod Touch followed by
laptop manufacturers that use snap together plastic cases the
literally require breaking tabs to disassemble.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

 

[none]

Jeff Liebermann wrote:

On Sat, 25 Jul 2009 10:10:30 -0700, none <""karls\"@(none)"> wrote:

The first lesson is: "Don't take anything apart that you cannot put back
together". which is a subset of "Don't do what you cannot undo".

The phrase "Learn by Destroying" implies that one learns something
from the exercise. Apparently, you haven't learned much. Fear of
disassembly is what prevents ordinary mortals from becoming competent
service personnel. I've dived into many contrivances, where I had no
clue as to what I was getting into, much less any clue what I was
doing. Sometimes, an astute customer will ask me "Have you ever done
this before"? Usually, my answer is no. Lack of expertise and prior
experience doesn't bother me. If I understand how it works, or is
suppose to work, I can usually figure out what's broken. I learn as I
go along. Lack of experience has never stopped me. However, I were
worried about reassembly, I probably wouldn't try to fix anything.

These days, I take digital photos of the disassembly, and organize the
screws so that I can replace them in the original location. I will
admit to having some difficulties putting Humpty Dumpty back together
again, but it's rare. I recent near disaster was replacing the batter
on an Apple iPod Touch 1G. Getting it apart is hell. Putting it back
together is worse. I eventually had to clamp the case together
between two pieces of wood, and apply excessive force with a pair of
vice grips. The risk of breaking the glass was rather high. If I had
known what was involved, I'm not sure if I would have attempted the
job. However, now that I know how it works, it's no big deal.

Anyway, at age 12, one would not expect anyone to know their own
limitations. After watching Superman on TV, I tried flying.

This lesson requires a good deal of "lab time".

Sure. Experience is a good teacher. However, reading the manual,
looking at the schematic, and understanding how it works, will
dramatically reduce the "lab time".

Most of humanity seldom, if ever, learns this lesson.

That's why I'm still in business. If the GUM (great unwashed masses)
had any interest in getting their hands dirty by tearing into their
toys, I would be looking for something else to do. I suspect this is
because of the ancient patrician attitude that the upper classes
should not have to deal with manual labor.

Incidentally, one the secrets to staying in business is the ability to
fix anything. Customers call me with computah problems. However,
when I arrive, it's not unusual to get involved in other electronic
failures. Phone, various audio/visual devices, cell phones,
appliances, garage door openers, and such are common repairs. For a
while, I was making more money dealing with printer problems than
computah.

However, last week, I hit the undo button. The customer called with a
problem with their ancient Konica copier. 500,000 pages and just
about everything is worn out. I've kept it alive by just keeping it
clean for about 15 years. So, I made a big show of tearing it apart,
proclaiming unsolvable difficulties, overestimating the damage, and
then hitting the undo button by returning it to its original
malfunctional state.

Also, I was seriously considering starting a "black list" of
manufacturers and products that are unusually difficult to disassemble
and/or repair, or are otherwise designed to discourage repair. It
probably won't help make things repairable, but it will highlight the
problem. Top of the list are the iPhone and iPod Touch followed by
laptop manufacturers that use snap together plastic cases the
literally require breaking tabs to disassemble.

I'm glad to see that you agree with everything I said.

 

[Arfa Daily]

The first lesson is: "Don't take anything apart that you cannot put back
together". which is a subset of "Don't do what you cannot undo".

This lesson requires a good deal of "lab time".

Most of humanity seldom, if ever, learns this lesson.

However, taking it apart before you *know* that you can put it back
together, is an important part of Jeff's 'learn by destruction' method, and
a daily part of anyone in the repair business's routine. I've been
professionally engaged in repairs for getting on for 40 years, and I still
find myself regularly taking apart things that I only *think* that I will be
able to reassemble by experience ...

Arfa

 

[Michael A. Terrell]

Bob Larter wrote:

grin> I blew up my mother's TV when I was about 14

Did you burn your lips? ;-)


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

http://www.flickr.com/photos/materrell/

 

[none]

Arfa Daily wrote:

The first lesson is: "Don't take anything apart that you cannot put back
together". which is a subset of "Don't do what you cannot undo".

This lesson requires a good deal of "lab time".

Most of humanity seldom, if ever, learns this lesson.

However, taking it apart before you *know* that you can put it back
together, is an important part of Jeff's 'learn by destruction' method, and
a daily part of anyone in the repair business's routine. I've been
professionally engaged in repairs for getting on for 40 years, and I still
find myself regularly taking apart things that I only *think* that I will be
able to reassemble by experience ...

Arfa


If you honestly think you can put it back together, then you are still

following the one true path. It is only those who take something apart
knowing they will not be able to reassemble it, or sometimes not even
thinking ahead that far, who are consigned to outer darkness...

I've met these people. Some of them have occasionally given me a
cardboard box of pieces, wanting me to make it work again.

The digital camera is a wonderful tool for documenting each step of the
process, and I use it often. Hurrah for macro focus.

Note, as a "TV Repairman" before I got into broadcasting, I was fixing
things that belonged to other people. If I destroyed their stuff, I
would have had to pay them for it.
It was far better economics to know those rare times when one has to say
"Sorry, I can't fix this for less than it's replacement cost" and give
it back in it's original condition.

That doesn't happen very often, I've taken apart and repaired defective
motors in tape cassette decks several times, when replacement motors
were not available. I've even rewound a power supply transformer once.

Sometimes you can't win even if you do fix the problem. I repaired an
old clock radio once, (This was in the mid-1970's, in a shop in Wichita,
Kansas) and cleaned up its grimy case as well. This revealed an old
crack in the plastic, and the owner accused me of breaking his radio.
Needless to say, that was not a profitable repair.
No good deed goes unpunished...

 

[Bob Larter]

Jeff Liebermann wrote:

On Sat, 25 Jul 2009 23:32:00 +1000, Bob Larter <bobbylarter@gmail.com
wrote:

Jeff Liebermann wrote:
Well, there are many ways to fix electonics. My motto is "Learn By
Destroying". I've even registered the domain name. Basically, one
doesn't really understand how something works until after they've
destroyed it, and frantically attempted to repair it before the
spouse, customer, or owner finds out.
grin> I blew up my mother's TV when I was about 14 (I'd run a tap into
it for composite video, but it was a live-chassis unit - I'm sure you
can guess the failure mode...), & managed to fix it before she got home.
(Only a transistor & a few resistors, thank god.) Boy, was that
educational! Mind you, that was back in the days when TV's came with a
schematic.

Huh? Transistors in a TV with an AC-DC power supply?

AC only. This was circa 1980, or thereabouts.

I doubt it.
That was the case with some tube type TV's and of course, the classic
5 tube radio, but not xsitorized TV's.

You've never seen transistor + IC TV with a live chassis? - I'm
surprised. Bear in mind that this was back in the days when (cheap) TVs
didn't have external inputs of any kind, so the manufacturers could save
money by not isolating the DC rails from the mains with a transformer.

My first experience was not electronic in nature. I was about 12
years old. We had a wind up mechanical clock on the mantle which
caught my attention. I wanted to know what made it tick, literally.
When the main spring went "sprong!", I knew that I had seriously
erred. I attempted to repair the damage, with no useful results. The
best I could do was cram all the parts and screws back into the case,
and hope that nobody noticed. Unfortunately, the lack of clock hands
and the lack of ticking made it all too obvious that something was
amiss. I was duly interrogated by the parents, and after the usual
improbable lies failed badly, I confessed.

Prior to this incident, every time I destroyed something, my father
would do his best to repair the damage. Broken windows, broken toys,
broken furniture, etc. This time was different. He demanded that I
repair the clock, while he watched.

My son is at about that stage. I'm not sure that I could be as patient
as your father. ;^)


--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------

 

[Bob Larter]

msg wrote:

On Sat, 25 Jul 2009 23:32:00 +1000, Bob Larter <bobbylarter@gmail.com
wrote:

snip

grin> I blew up my mother's TV when I was about 14 (I'd run a tap
into it for composite video, but it was a live-chassis unit - I'm sure
you can guess the failure mode...), & managed to fix it before she got
home. (Only a transistor & a few resistors, thank god.) Boy, was that
educational! Mind you, that was back in the days when TV's came with a
schematic.

Jeff Liebermann wrote:

Huh? Transistors in a TV with an AC-DC power supply? I doubt it.
That was the case with some tube type TV's and of course, the classic
5 tube radio, but not xsitorized TV's.

Au contraire, mon ami; in 1979 I added a 75 video input connection
(BNC) to a Ward's branded 13 inch color set which did not have
a power transformer and I needed to use an isolation transformer with
it when it was connected to a video source (IIRC, it had a full wave
and not bridge rectifier, with one lead from the AC mains connected
to the chassis (through a filter)). I made the mistake of failing
to check AC plug polarity one time (without using the isolation
transformer) and got a nasty current loop through the video source
that fortunately only blew a fuse.

<nods> The only differences in my case was that I didn't have an
isolation transformer, & blew a few components in the video amp circuit.
I was damn lucky that it didn't take out the jungle chip.

--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------

 

[Bob Larter]

Michael A. Terrell wrote:

Bob Larter wrote:
grin> I blew up my mother's TV when I was about 14


Did you burn your lips? ;-)

<groan>

Cue the old joke about the Irish terrorist who blew up a bus.


--
W
. | ,. w , "Some people are alive only because
\|/ \|/ it is illegal to kill them." Perna condita delenda est
---^----^---------------------------------------------------------------