Fixed my ProView 19" crt Monitor

J

JR North

Guest
I love it when stuff works out. I'm not an electronics repair tech by
any means, but can usually fix stuff anyway. Monitor would sometimes
power up, but no screen. Other times, the screen brightness would
slowly go up and down, then down to blank screen. A light whack on the
case would usually fix it, temporarily. Eventually, the whack stopped
working, and the monitor would not drive the screen at all. Almost
pitched it, but decided to give it a shot first. Took the case apart,
discharged the HV, removed the neck board and unsoldered/removed the
shield on it. Reflowed the connections to the neck socket, and some
other iffy-looking solder joints. Works great again.
JR
HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------
 
"JR North" <junkjasonrnorth@bigfoot.com> wrote in message
news:stc0k593gpjtpc2skq0ipev8j2hd33ca99@4ax.com...
I love it when stuff works out. I'm not an electronics repair tech by
any means, but can usually fix stuff anyway. Monitor would sometimes
power up, but no screen. Other times, the screen brightness would
slowly go up and down, then down to blank screen. A light whack on the
case would usually fix it, temporarily. Eventually, the whack stopped
working, and the monitor would not drive the screen at all. Almost
pitched it, but decided to give it a shot first. Took the case apart,
discharged the HV, removed the neck board and unsoldered/removed the
shield on it. Reflowed the connections to the neck socket, and some
other iffy-looking solder joints. Works great again.
JR
HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------
Click to expand...
Well done Jason ! Always gratifying when something like that works out, and
good to have saved it from landfill, if nothing else.

Arfa
 
In article <stc0k593gpjtpc2skq0ipev8j2hd33ca99@4ax.com>,
JR North <junkjasonrnorth@bigfoot.com> wrote:

I love it when stuff works out. I'm not an electronics repair tech by
any means, but can usually fix stuff anyway. Monitor would sometimes
power up, but no screen. Other times, the screen brightness would
slowly go up and down, then down to blank screen. A light whack on the
case would usually fix it, temporarily. Eventually, the whack stopped
working, and the monitor would not drive the screen at all. Almost
pitched it, but decided to give it a shot first. Took the case apart,
discharged the HV, removed the neck board and unsoldered/removed the
shield on it. Reflowed the connections to the neck socket, and some
other iffy-looking solder joints. Works great again.
JR
HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------
Click to expand...

Dry joints seem to be one of the very common faults modern gear seems to
fall prey to - I wonder if they still have people inspecting and
correcting the soldering these days.

Many years ago I spent a few days on a production line 'dryjointing'
circuit boards after they came through the solder bath. Mongrel of a
job, but when you are young you do what you are told.

The girls that did this on a day to day basis complained of sore eyes
from the glare.

Perhaps things have changed

David
 
"David" <postings@REMOVE-TO-REPLYconfidential-counselling.com> wrote in
message news:postings-D6C788.10292204012010@news.bigpond.com...
In article <stc0k593gpjtpc2skq0ipev8j2hd33ca99@4ax.com>,
JR North <junkjasonrnorth@bigfoot.com> wrote:

I love it when stuff works out. I'm not an electronics repair tech by
any means, but can usually fix stuff anyway. Monitor would sometimes
power up, but no screen. Other times, the screen brightness would
slowly go up and down, then down to blank screen. A light whack on the
case would usually fix it, temporarily. Eventually, the whack stopped
working, and the monitor would not drive the screen at all. Almost
pitched it, but decided to give it a shot first. Took the case apart,
discharged the HV, removed the neck board and unsoldered/removed the
shield on it. Reflowed the connections to the neck socket, and some
other iffy-looking solder joints. Works great again.
JR
HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------


Dry joints seem to be one of the very common faults modern gear seems to
fall prey to - I wonder if they still have people inspecting and
correcting the soldering these days.

Many years ago I spent a few days on a production line 'dryjointing'
circuit boards after they came through the solder bath. Mongrel of a
job, but when you are young you do what you are told.

The girls that did this on a day to day basis complained of sore eyes
from the glare.

Perhaps things have changed

David
Click to expand...
Only for the worse I'm afraid, David. It's all lead-free solder now, and dry
joints are a bigger problem than they they have ever been in the past - even
back to the early days of printed circuit introduction, when the technology
of automated soldering was young and immature ...

The problem is made doubly bad by the utterly different characteristics of a
lead-free bad joint. It is very typical for a joint to go intermittent
completely randomly, but not be able to be provoked by physical disturbance,
heating or freezing, and yet when you actually find the little mutha, it
will often be such a bad joint that the solder has not stuck to the
component leg at all, and you can actually pull it out of the board. Apart
from that, you can no longer spot a bad joint at twenty paces, as you could
with leaded solder. With lead-free, *all* joints look bad to the
traditionally trained eye ...

Arfa
 
On Jan 3, 7:37 pm, "Arfa Daily" <arfa.da...@ntlworld.com> wrote:
"David" <posti...@REMOVE-TO-REPLYconfidential-counselling.com> wrote in
messagenews:postings-D6C788.10292204012010@news.bigpond.com...





In article <stc0k593gpjtpc2skq0ipev8j2hd33c...@4ax.com>,
JR North <junkjasonrno...@bigfoot.com> wrote:

I love it when stuff works out. I'm not an electronics repair tech by
any means, but can usually fix stuff anyway. Monitor would sometimes
power up, but no screen. Other times, the screen brightness would
slowly go up and down, then down to blank screen. A light whack on the
case would usually fix it, temporarily. Eventually, the whack stopped
working, and the monitor would not drive the screen at all.  Almost
pitched it, but decided to give it a shot first. Took the case apart,
discharged the HV, removed the neck board and unsoldered/removed the
shield on it. Reflowed the connections to the neck socket, and some
other iffy-looking solder joints. Works great again.
JR
HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------

Dry joints seem to be one of the very common faults modern gear seems to
fall prey to - I wonder if they still have people inspecting and
correcting the soldering these days.

Many years ago I spent a few days on a production line 'dryjointing'
circuit boards after they came through the solder bath.  Mongrel of a
job, but when you are young you do what you are told.

The girls that did this on a day to day basis complained of sore eyes
from the glare.

Perhaps things have changed

David

Only for the worse I'm afraid, David. It's all lead-free solder now, and dry
joints are a bigger problem than they they have ever been in the past - even
back to the early days of printed circuit introduction, when the technology
of automated soldering was young and immature ...

The problem is made doubly bad by the utterly different characteristics of a
lead-free bad joint. It is very typical for a joint to go intermittent
completely randomly, but not be able to be provoked by physical disturbance,
heating or freezing, and yet when you actually find the little mutha, it
will often be such a bad joint that the solder has not stuck to the
component leg at all, and you can actually pull it out of the board. Apart
from that, you can no longer spot a bad joint at twenty paces, as you could
with leaded solder. With lead-free, *all* joints look bad to the
traditionally trained eye ...

Arfa- Hide quoted text -

- Show quoted text -
Click to expand...
AMEN!!!
 
Yup. the joints I reflowed appeared to not have the solder wick onto
the pins.
JR

On Mon, 4 Jan 2010 01:37:17 -0000, "Arfa Daily"
<arfa.daily@ntlworld.com> wrote:

"David" <postings@REMOVE-TO-REPLYconfidential-counselling.com> wrote in
message news:postings-D6C788.10292204012010@news.bigpond.com...
In article <stc0k593gpjtpc2skq0ipev8j2hd33ca99@4ax.com>,
JR North <junkjasonrnorth@bigfoot.com> wrote:

I love it when stuff works out. I'm not an electronics repair tech by
any means, but can usually fix stuff anyway. Monitor would sometimes
power up, but no screen. Other times, the screen brightness would
slowly go up and down, then down to blank screen. A light whack on the
case would usually fix it, temporarily. Eventually, the whack stopped
working, and the monitor would not drive the screen at all. Almost
pitched it, but decided to give it a shot first. Took the case apart,
discharged the HV, removed the neck board and unsoldered/removed the
shield on it. Reflowed the connections to the neck socket, and some
other iffy-looking solder joints. Works great again.
JR
HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------


Dry joints seem to be one of the very common faults modern gear seems to
fall prey to - I wonder if they still have people inspecting and
correcting the soldering these days.

Many years ago I spent a few days on a production line 'dryjointing'
circuit boards after they came through the solder bath. Mongrel of a
job, but when you are young you do what you are told.

The girls that did this on a day to day basis complained of sore eyes
from the glare.

Perhaps things have changed

David

Only for the worse I'm afraid, David. It's all lead-free solder now, and dry
joints are a bigger problem than they they have ever been in the past - even
back to the early days of printed circuit introduction, when the technology
of automated soldering was young and immature ...

The problem is made doubly bad by the utterly different characteristics of a
lead-free bad joint. It is very typical for a joint to go intermittent
completely randomly, but not be able to be provoked by physical disturbance,
heating or freezing, and yet when you actually find the little mutha, it
will often be such a bad joint that the solder has not stuck to the
component leg at all, and you can actually pull it out of the board. Apart
from that, you can no longer spot a bad joint at twenty paces, as you could
with leaded solder. With lead-free, *all* joints look bad to the
traditionally trained eye ...

Arfa

HOME PAGE:
Click to expand...
http://www.seanet.com/~jasonrnorth
--------------------------------------------------
 
Arfa Daily <arfa.daily@ntlworld.com> wrote in message
news:jDb0n.27133$p33.7746@newsfe20.ams2...
"David" <postings@REMOVE-TO-REPLYconfidential-counselling.com> wrote in
message news:postings-D6C788.10292204012010@news.bigpond.com...
In article <stc0k593gpjtpc2skq0ipev8j2hd33ca99@4ax.com>,
JR North <junkjasonrnorth@bigfoot.com> wrote:

I love it when stuff works out. I'm not an electronics repair tech by
any means, but can usually fix stuff anyway. Monitor would sometimes
power up, but no screen. Other times, the screen brightness would
slowly go up and down, then down to blank screen. A light whack on the
case would usually fix it, temporarily. Eventually, the whack stopped
working, and the monitor would not drive the screen at all. Almost
pitched it, but decided to give it a shot first. Took the case apart,
discharged the HV, removed the neck board and unsoldered/removed the
shield on it. Reflowed the connections to the neck socket, and some
other iffy-looking solder joints. Works great again.
JR
HOME PAGE:
http://www.seanet.com/~jasonrnorth
--------------------------------------------------


Dry joints seem to be one of the very common faults modern gear seems to
fall prey to - I wonder if they still have people inspecting and
correcting the soldering these days.

Many years ago I spent a few days on a production line 'dryjointing'
circuit boards after they came through the solder bath. Mongrel of a
job, but when you are young you do what you are told.

The girls that did this on a day to day basis complained of sore eyes
from the glare.

Perhaps things have changed

David

Only for the worse I'm afraid, David. It's all lead-free solder now, and
dry
joints are a bigger problem than they they have ever been in the past -
even
back to the early days of printed circuit introduction, when the
technology
of automated soldering was young and immature ...

The problem is made doubly bad by the utterly different characteristics of
a
lead-free bad joint. It is very typical for a joint to go intermittent
completely randomly, but not be able to be provoked by physical
disturbance,
heating or freezing, and yet when you actually find the little mutha, it
will often be such a bad joint that the solder has not stuck to the
component leg at all, and you can actually pull it out of the board. Apart
from that, you can no longer spot a bad joint at twenty paces, as you
could
with leaded solder. With lead-free, *all* joints look bad to the
traditionally trained eye ...

Arfa
Click to expand...
With the recent very cold spell recently in the UK do you expect a rush of
lead-free tin-pest intermittants in the coming weeks?
Even if the mediaeval organ builders knew not of allotropes , they knew tin
organ pipes would crumble to dust in the little ice age era.

Re the OP the signature is slow changes , usually indicating fault up around
the CRT neck

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://diverse.4mg.com/index.htm
 
Just researching for timeplot for degree of tinpest v temp (av) v temp (min)
http://www.youtube.com/watch?v=vVtCPw7RsW4
NPL artificially speeded up.
Still not found timeline curves for onset after severe temp minima


--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://diverse.4mg.com/index.htm
 
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