[TechAssist] Re: SONY KV32S40 SCC-S08A-A *PINCUSHION*
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 2 Apr 2003 10:34:27 -0500
Kevin,
I would also suspect C511 and IC501. I am going to send you privately a PDF
document on the pincushion circuit for this set since I cannot send it to
the list as an attachment. See the following also:
SYMPTOMS
Unit has severe over scan of horizontal sweep. Tech replaced Q512 Shorted
and Q511 open all elements.
RESOLUTION
Measuring the collector of Q512 tech finds the voltage running in excess
of -7 volts. The voltage on this transistor in inconsistent with the symptom
on the screen of a narrow raster that is hourglass shaped. L511 and Q512 are
burning up. Suggest the tech replace the following additional components
D502, D503, D504, C511, and C513.
See E17958715 on reason L511 is overheating.
If there is no input to Q511 then L511 will heat up. Make sure IC501/pins 5
& 6 have proper waveforms. See attachments.
IC501/pin 5 .5v, 20us
IC501/pin 6 .5v, 5ms
IC501/pin 7 .5v, 5ms
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
www.geminicomputertvsecurityalarms.com
----- Original Message -----
From: "Kevin Gunn" <kgunn@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, April 02, 2003 8:30 AM
Subject: [TechAssist] Re: SONY KV32S40 SCC-S08A-A *PINCUSHION*
> I have replaced the following with no result.
>
> Q512, D516, C530, L511, Q511, D502, D503, D504, C513.
>
> I also went to the SERVICE MODE and when adjusting any of the HORIZ or
PAMP parameters there was no change.
>
> I suspect IC 501 which is the surface mount PIN CONTROL, unless there is
an EEPROM in this set.
>
> Does anyone else have any input?
>
> Kevin Gunn
> Star Tek Electronic Services
> 390 Springbank Drive
> London, Ontario
> www.ulurn.com/startek
>
> N6J 1G9 519-473-6366
> ----- Original Message -----
> From: Kevin Gunn
> To: techassist@xxxxxxxxxxxxx
> Sent: Thursday, March 27, 2003 9:57 PM
> Subject: SONY KV32S40 *PINCUSHION*
>
>
> I have a 32" SONY KV32S40 with severe PINCUSHION problem.
> Does anyone have anything on this set, I do not have a schematic.
>
> Kevin Gunn
> Star Tek Electronic Services
> 390 Springbank Drive
> London, Ontario
> www.ulurn.com/startek
>
> N6J 1G9 519-473-6366
>
>
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