Transistor specifications, (D1556)?

[mrwebcrawler]

Greetings,

I by no means know the difference between a transistor, and a lamp
shade, but going to try to ask for help on behalf of another party.

I managed to find a bit of info for him online, mainly parts
replacement. What he is asking me is, a schematic of the actual D1556
part itself, what's 'inside'? I think it's like a transistor with a
diode built in.

Any help or leads would be appreciated.

 

[Sofie]

mrwebcrawler:

Yes, you are almost correct...... internally in the 2sd1556 there is an
internal 50 ohm resistor ( base to emitter) and a damper diode connected
between the emitter and collector (cathode to collector).
The 2sd1556 is a NPN, Silicon, high speed, high voltage, switching
transistor with a built-in damper diode.... used almost exclusively as a
Horizontal Output Transistor in modern televisions and monitors.
1500 V
6 A
50 W

Not all Horizontal Output Transistors like the 2sd1556 have the built-in
resistor, many have just the damper diode, then, of course there are a
number of devices with similar specs that don't have the resistor or damper
diode.... just a high speed, high voltage, switching transistor like the
BU508 and others.

--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


"mrwebcrawler" <admin@mrwebcrawler.com> wrote in message
news:718fc989.0402111246.5798ffcc@posting.google.com...

Greetings,

I by no means know the difference between a transistor, and a lamp
shade, but going to try to ask for help on behalf of another party.

I managed to find a bit of info for him online, mainly parts
replacement. What he is asking me is, a schematic of the actual D1556
part itself, what's 'inside'? I think it's like a transistor with a
diode built in.

Any help or leads would be appreciated.

 

[Bruce]

I thinks its a small HOT ie with diode, I'm curious, what would you do with
this info
BTW the transistor is very common

"mrwebcrawler" <admin@mrwebcrawler.com> wrote in message
news:718fc989.0402111246.5798ffcc@posting.google.com...

Greetings,

I by no means know the difference between a transistor, and a lamp
shade, but going to try to ask for help on behalf of another party.

I managed to find a bit of info for him online, mainly parts
replacement. What he is asking me is, a schematic of the actual D1556
part itself, what's 'inside'? I think it's like a transistor with a
diode built in.

Any help or leads would be appreciated.

 

[Michael Turner]

admin@mrwebcrawler.com (mrwebcrawler) wrote:

Greetings

I by no means know the difference between a transistor, and a lam
shade, but going to try to ask for help on behalf of another party

I managed to find a bit of info for him online, mainly part
replacement. What he is asking me is, a schematic of the actual D155
part itself, what's 'inside'? I think it's like a transistor with
diode built in

Any help or leads would be appreciated

2SD1556

--

Michael Turne

Posted with PPCNew

 

[john]

Its a Horizontal Output with internal Damper Diode.
kip

--
"Watch the return E-Mail addy its false"
"Michael Turner" <mike.turner1963@DeleteThisToEmail.virgin.net> wrote in
message news:_cGdnRAsDJsGDbbd4p2dnA@giganews.com...

admin@mrwebcrawler.com (mrwebcrawler) wrote:

Greetings,

I by no means know the difference between a transistor, and a lamp
shade, but going to try to ask for help on behalf of another party.

I managed to find a bit of info for him online, mainly parts
replacement. What he is asking me is, a schematic of the actual D1556
part itself, what's 'inside'? I think it's like a transistor with a
diode built in.

Any help or leads would be appreciated.

2SD1556 ?

--

Michael Turner

Posted with PPCNewz

 

[mrwebcrawler]

"Bruce" <Montypythom@hotmail.com> wrote in message news:<402b57b0$0$19704$afc38c87@news.optusnet.com.au>...

I thinks its a small HOT ie with diode, I'm curious, what would you do with
this info
BTW the transistor is very common

"mrwebcrawler" <admin@mrwebcrawler.com> wrote in message
news:718fc989.0402111246.5798ffcc@posting.google.com...
Greetings,

I by no means know the difference between a transistor, and a lamp
shade, but going to try to ask for help on behalf of another party.

I managed to find a bit of info for him online, mainly parts
replacement. What he is asking me is, a schematic of the actual D1556
part itself, what's 'inside'? I think it's like a transistor with a
diode built in.

Any help or leads would be appreciated.

Not at the place myself right now, so what I post will be off the top
of my head.

Generally, I think this gentleman is going to open a electronics and
electrical repair shop sometime soon. He is learning English, (quite
well I may add), and I think he is/was some sort of... electonics
engineer or something. The long and short of it from what I can see;
European electronics and components, are quite different, but yet
similar.

Anyways, the story goes: he promised someone he would fix a 1992/93
Panasonic TV, and the task is... challenging, since he has little to
go on.

I managed to dig up, (on the internet), a bunch of information he
needed: schematic/service manuals of similar to this PC-29[brainfart],
datasheets of whatever that IC (? 7858) was that he is trying to
figure out, and I think a datasheet of a similar to the d1556, (? NPN,
B/E/C, ratings).

Along with this unit, he has to look at the accomanying Panasonic
DVD-A110, which I still have to dig up what I can on that, (he's
asking for schematics).

Third person perspective doesn't help much, does it? Will try to post
better information when I understand a bit more of that he needs.

I see it as, he has a similar schematic, though the components are
different. Probably a question of plugging the right transistor in the
right way. ;-)

Thanks for your time btw.

 

[mrwebcrawler]

"Sofie" <sofie@olypen.com> wrote in message news:<102laa2rja8mbc7@corp.supernews.com>...

mrwebcrawler:

Yes, you are almost correct...... internally in the 2sd1556 there is an
internal 50 ohm resistor ( base to emitter) and a damper diode connected
between the emitter and collector (cathode to collector).
The 2sd1556 is a NPN, Silicon, high speed, high voltage, switching
transistor with a built-in damper diode.... used almost exclusively as a
Horizontal Output Transistor in modern televisions and monitors.
1500 V
6 A
50 W

Not all Horizontal Output Transistors like the 2sd1556 have the built-in
resistor, many have just the damper diode, then, of course there are a
number of devices with similar specs that don't have the resistor or damper
diode.... just a high speed, high voltage, switching transistor like the
BU508 and others.

--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -


"mrwebcrawler" <admin@mrwebcrawler.com> wrote in message
news:718fc989.0402111246.5798ffcc@posting.google.com...
Greetings,

I by no means know the difference between a transistor, and a lamp
shade, but going to try to ask for help on behalf of another party.

I managed to find a bit of info for him online, mainly parts
replacement. What he is asking me is, a schematic of the actual D1556
part itself, what's 'inside'? I think it's like a transistor with a
diode built in.

Any help or leads would be appreciated.

Wow, thanks Mr. Sofie, will run that by him.

For my interest though: the part is stamped with d1556, ('T' above, I
think '40' below), and you mention, (as I have seen in searching),
prefixed with '2s'. Is there, and how much of a difference is there in
these two?



Open question:

If he was to start doing this as a small business, (sole
proprietorship), where on the internet would be a good place to start,
to see what he would be getting into?

 

[mrwebcrawler]

Thanks, so helpful so far.

Anyways, I think he is hoping to find a schematic for the panasonic
pc-29xf20a with chasis yanedp218, but would settle with something that
can show him how the ic la7838 and that transistor d1556 work
together. The similar schematic I found him is similar, but different
enough I guess.

 

[mrwebcrawler]

admin@mrwebcrawler.com (mrwebcrawler) wrote in message news:<718fc989.0402130359.6b87b4d6@posting.google.com>...

Thanks, so helpful so far.

Anyways, I think he is hoping to find a schematic for the panasonic
pc-29xf20a with chasis yanedp218, but would settle with something that
can show him how the ic la7838 and that transistor d1556 work
together. The similar schematic I found him is similar, but different
enough I guess.

Hi again,

Multi-part... (and help so far is so much appreciated).

If we needed to get an exact schematic, (assuming printed medium
because of age), for the Panasonic pc-29xf20a, where would be
recommended to look, (and for about what price)?

He was speaking to someone close to us here, and supposedly there are
publications by manufacturers as well, on a fairly regular basis?

Basically, he has this tv and the dvd-a110 sitting on his bench. The
question I would ask is, how cane he get the information he needs to
repair this unit, and get it back out the door, in as little time, and
cost, to him?

I thank thee again...

John.

 

[Sofie]

mrwebcrawler:
I can not help but think how can your tech friend even hope to repair your
units in a timely fashion if he has questions such as "what is a D1556?"
...... and "how the LA7838 and D1556 work together?" ... and "where to find
schematics".... etc, etc.
Maybe it is time to TAKE the equipment to a trained technician in a well
equipped shop for a proper and safe repair... or at the very least get a
repair cost estimate so you can make an intelligent repair decision. Most
experienced and knowledgeable tech repair televisions many times without the
aid of schematics..... there is a lot of troubleshooting, testing and
repairing that can be done without the schematic.
Your friend can then have the freedom to learn television repair procedures
at his own pace instead of being under the gun here and it seems to be more
than obvious that he may be over his head and possibly beyond his skill and
experience level.
You should do your tech friend a favor and direct him to the website for
this newsgroup at
http://www.repairfaq.org?
There, with some searching, there is a wealth of troubleshooting tips,
repair procedures, component testing methods and IMPORTANT safety
information.
--
Best Regards,
Daniel Sofie
Electronics Supply & Repair
----------------------------



"mrwebcrawler" <admin@mrwebcrawler.com> wrote in message
news:718fc989.0402161825.4488921@posting.google.com...

admin@mrwebcrawler.com (mrwebcrawler) wrote in message
news:<718fc989.0402130359.6b87b4d6@posting.google.com>...
Thanks, so helpful so far.

Anyways, I think he is hoping to find a schematic for the panasonic
pc-29xf20a with chasis yanedp218, but would settle with something that
can show him how the ic la7838 and that transistor d1556 work
together. The similar schematic I found him is similar, but different
enough I guess.

Hi again,

Multi-part... (and help so far is so much appreciated).

If we needed to get an exact schematic, (assuming printed medium
because of age), for the Panasonic pc-29xf20a, where would be
recommended to look, (and for about what price)?

He was speaking to someone close to us here, and supposedly there are
publications by manufacturers as well, on a fairly regular basis?

Basically, he has this tv and the dvd-a110 sitting on his bench. The
question I would ask is, how cane he get the information he needs to
repair this unit, and get it back out the door, in as little time, and
cost, to him?

I thank thee again...

John.