Set has very dark bluish OSD only. Raising screen control produces
slight bluish retrace lines for only a few seconds and then raster
fades to black again. Basically the only thing you can see is the
smeary OSD. Collector rsistors read about 250Von both sides. Looked for
the little transistor I thought I'd find on the video board but this
set has none. Any common problems of this sort with this chassis?
Thanks, Lenny Stein, Barlen Electronics.

Try taking the tuner out of the circuit and see if the AV jacks then
produce a picture. It's common for the tuner to short, load down the
data lines and foul up the entire video circuit.
wrote:
Set has very dark bluish OSD only. Raising screen control produces
slight bluish retrace lines for only a few seconds and then raster
fades to black again. Basically the only thing you can see is the
smeary OSD. Collector rsistors read about 250Von both sides. Looked for
the little transistor I thought I'd find on the video board but this
set has none. Any common problems of this sort with this chassis?
Thanks, Lenny Stein, Barlen Electronics.

I neglected to mention though I do have sound. Would the tuner still be
suspect? Lenny

wrote:
Set has very dark bluish OSD only.

I would be suspicious of ICX2200 (221-01165). Any suggestion of
lightning? If so, it's almost a shoo-in.


David, on the Illinois prairie.

David, I was considering that chip. I had planned to check the three
driver transistors on the main board also but I was wondering if you
would know what DC voltage I could expect to find on the R,G, and B
output pins of the chip, and also what should be the magnitude of the
video waveforms at those points? Thanks very much. Lenny Stein, Barlen
Electronics.

wrote:
I was wondering if you
would know what DC voltage I could expect to find on the R,G, and B
output pins of the chip, and also what should be the magnitude of the
video waveforms at those points?


ICX2200

Pin 19 R OUT

Pin 20 G OUT

Pin 21 B OUT

About 2.5 VDC, about 3.0 V P-P


Connector 2C5

Pin 1 Red 4.4 V P-P

Pin 2 Grn 3.9 V P-P

Pin 3 Blu 2.8 V P-P

Q 2203 is Red
Q 2204 is Green
Q 2205 is Blue

PNP (anything will do). The only time I have had these bad is an
occasional shorted one which will kill that particular color only.

David, on the Illinois prairie.

David I checked the voltages and they seemed way out of whack so I
replaced the chip but the problem is still there. Do you have any
other ideas or perhaps do you have a schematic of this set you might be
able to share with me? Thanks very much for any further assistance.
Lenny Stein, Barlen Electronics

wrote:
David I checked the voltages and they seemed way out of whack so I
replaced the chip but the problem is still there. Do you have any
other ideas or perhaps do you have a schematic of this set you might be
able to share with me? Thanks very much for any further assistance.
Lenny Stein, Barlen Electronics


Ooooo. This could be a real buggah. I have the schematics, such
as they are, since this (32" diag.) was only board level repair for
that model.
You have figured out that my posting e-mail is no longer a useable
address. If you can post a fax number I will copy it and transmit it
or give me a mailing address and I will mail you a copy.
Reverse the digits on your fax or your mailing address, or some
such scheme. I'm not good at making and sending electronic copies.
Nothing else comes to mind as far as a fix goes. I have notes for
earlier models ("A" line) with these sort of problems, but it's not the
same circuit we are talking about here. The same IC, but different off
chip schemes.
Finally, a confession: I'm not a master technician. I've just
been around the block so to speak.

David, on the Illinois prairie. Man, did it storm this evening.

wrote:
David I checked the voltages and they seemed way out of whack so I
replaced the chip but the problem is still there. Do you have any
other ideas or perhaps do you have a schematic of this set you might be
able to share with me? Thanks very much for any further assistance.
Lenny Stein, Barlen Electronics


Ooooo. This could be a real buggah. I have the schematics, such
as they are, since this (32" diag.) was only board level repair for
that model.
You have figured out that my posting e-mail is no longer a useable
address. If you can post a fax number I will copy it and transmit it
or give me a mailing address and I will mail you a copy.
Reverse the digits on your fax or your mailing address, or some
such scheme. I'm not good at making and sending electronic copies.
Nothing else comes to mind as far as a fix goes. I have notes for
earlier models ("A" line) with these sort of problems, but it's not the
same circuit we are talking about here. The same IC, but different off
chip schemes.
Finally, a confession: I'm not a master technician. I've just
been around the block so to speak.

David, on the Illinois prairie. Man, did it storm this evening.

Lenny

I'm in the shop for a change, and am looking at my notes for past
problems of this natu


D2206 (off pin 30 of ICX2200) Leaky after lightning, no video

David, on the Illinois prairie.

Lenny

I'm in the shop for a change, and am looking at my notes for past
problems of this natu


D2206 (off pin 30 of ICX2200) Leaky after lightning, no video

David, on the Illinois prairie.

David thanks fior the help and advice. The customer started to balk at
the time and cost and I didn't need any more grief from this dog so I
gave up on it. Best regards, Lenny