[TechAssist] Sony TV - KV32FS100 Red/Blue pull away from Green
- From: "Damon" <damon101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 3 Jun 2004 08:48:27 -0500
Whoops, signature needed.....
Damon Brunger
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Damon" <damon101@xxxxxxxxxxxxxx>
To: "TechAssist" <techassist@xxxxxxxxxxxxx>
Sent: Thursday, June 03, 2004 8:02 AM
Subject: [TechAssist] Sony TV - KV32FS100 Red/Blue pull away from Green
| Anybody remember the Sony CRT that has the BUILT-IN Convergence Grid on
the
| Direct View TVS???
|
| I'm working on a Sony KV32FS100.....on the bottom of the picture the Red
and
| Blue part of the picture pulls up when the contrast is maxed out. Reducing
| contrast causes the RED/BLUE to approach normal geometry, Green doesn't
seem
| to be affected, and adjusting the screen control has the same effect......
| If I didn't see it myself in the customer's home I wouldn't have believed
| it.....but sometime ago the trainers mentioned an internal grid tied to
the
| HV section and it is used to >>help/assist<< in converging the color.
|
| Page 41 of the Sony schematic show a resistor array tying several grids to
| HV, and I'm pretty sure that's the circuit I'm dealing with.....but if
| anybody has more info about this, it would help me get a better grasp as
to
| what is going on.
|
| I ran several tests on the CRT, including checking geometry/yoke. While I
| heard what sounded like corona hiss around the yoke, pulling the yoke
| revealed no arc/char spots....but boy was the tape on the crt neck toasty
| looking.
|
| I just can't state that the CRT is BAD, mostly because the Green isn't
| affected at all, the picture has good geometry, and the red/blue is
affected
| ELECTRICALLY. I'm looking for a part....or an electronic signal out of
| whack.
|
|
|
|
|
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