Sony Trinitron Color Problem

B

beaudoin

Guest
I have a twelve year old Sony Trinitron that has suddenly developed a color
problem. The colors all of a sudden changed to mainly green and pink. No
adjustment brings it back to normal. A friend told me a color gun failed.
Might this be so? Another friend told me it might be the video board. If
this is so, where can I get a replacement board? And where can I get a
schematic?
 
It is most likley a weak electron gun in the CRT which throws the color
mixing off balance
 
Being 12+ years old it is probable the crt has finaly given up, may want to
have the tele checked out to assure yourself of that fact or just look for a
viable replacment tele.
"MarkC" <markcharles@webtv.net> wrote in message
news:2187-409F2455-102@storefull-3131.bay.webtv.net...
It is most likley a weak electron gun in the CRT which throws the color
mixing off balance
Click to expand...
 
"beaudoin" <cn8cg@ixpres.com> wrote in message
news:2g8b1uF5gbmfU1@uni-berlin.de...
I have a twelve year old Sony Trinitron that has suddenly developed a
color
problem. The colors all of a sudden changed to mainly green and pink. No
adjustment brings it back to normal. A friend told me a color gun failed.
Might this be so? Another friend told me it might be the video board. If
this is so, where can I get a replacement board? And where can I get a
schematic?
Click to expand...

I think a sudden change like you indicate points to a component failure
rather than a weak tube as the tubes tend to lose emmission more slowly over
time. A green/pink picture might indicate a failed blue video output device.
Swapping the RGB connectors on the CRT neck might help in diagnosis.
You don't say which model but there are some Sony schematics available here
http://rv6llh.rsuh.ru/shema2.htm
Other posters may know of others.
Pete
 
What's the model #?


--

=================================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
(860)399-1861
(860)664-3535 FAX
jstielau@snet.net
=================================
"beaudoin" <cn8cg@ixpres.com> wrote in message
news:2g8b1uF5gbmfU1@uni-berlin.de...
I have a twelve year old Sony Trinitron that has suddenly developed a
color
problem. The colors all of a sudden changed to mainly green and pink. No
adjustment brings it back to normal. A friend told me a color gun failed.
Might this be so? Another friend told me it might be the video board. If
this is so, where can I get a replacement board? And where can I get a
schematic?
Click to expand...
 
I think a sudden change like you indicate points to a component failure
rather than a weak tube as the tubes tend to lose emmission more slowly
over
time. A green/pink picture might indicate a failed blue video output
device.
Swapping the RGB connectors on the CRT neck might help in diagnosis.
You don't say which model but there are some Sony schematics available
here
http://rv6llh.rsuh.ru/shema2.htm
Other posters may know of others.
Pete
Click to expand...
I would agree with Pete's assessment. Sams Fotofacts are usually my first
choice for schematics.
Warning: Sonys can be a pain in the a*s to fix! <smile>
John
 
On Sun, 9 May 2004 23:25:45 -0400, "beaudoin" <cn8cg@ixpres.com> wrote:

I have a twelve year old Sony Trinitron that has suddenly developed a color
problem. The colors all of a sudden changed to mainly green and pink. No
adjustment brings it back to normal. A friend told me a color gun failed.
Might this be so? Another friend told me it might be the video board. If
this is so, where can I get a replacement board? And where can I get a
schematic?
Click to expand...
Don't overlook a degauss problem. Sometimes a magnetized tube can have the
overall appearance of a missing color, instead of the more commonly seen
localized discoloration. Might try resoldering the degauss thermistor.

Alan Harriman






 
Thanks to everyone responding. The model number is kv-27tr10. Any
additional leads/help will certainly appreciated.
 
I don't know if this was mentioned already, but look for an aprox 1"x1" square
shaped black colored part. It's a 3 leg thermister labeled on the board as
THP601. It's on the far left of the main board toward the back a couple inches
from the fuse. Look at all 3 connections to this part under the board. You'll
find a burnt connection on one lead. Resolder it and you'll be all fixed up.
Ron
 
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