[TechAssist] Re: KV32V36,strange problem after power supply repair,won"t power down!
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 26 Nov 2003 07:27:37 -0500
Last Update
5/9/2002 Event ID
E08912019 Model
KV32V36
Subject
DEAD (SHORTED D103, D104, AND IC641)
SYMPTOMS
Unit will not power up. Standby voltage measured 1v.
RESOLUTION
Found shorted D103, D104. After replacing diodes found unit would shut down.
By reducing the input voltage unit would power on but would not power off,
HV was still on. Also found IC641, 874992058 shorted and outputting about
10v instead of 9v.
Last Update
3/27/2002 Event ID
E16571130 Model
KV32V26, KV32V36, KV35V36, KV35V76
Subject
Power Relay Cycling, No Raster, No Sound
SYMPTOMS
Power Relay Cycling, No Raster, No Sound
CAUSE
Power Relay Cycling, No Raster Replaced relay drive transistor. Check
component loading down I2C bus. With AV board disconnected, set powers up
with raster and sound.
RESOLUTION
No +9V supply on AV board. Therefore I2C bus being loaded down. Defective +9
volt regulator IC. BA09.
Also check to see if relay is working properly (sticking contacts).
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
www.geminicomputertvsecurityalarms.com
----- Original Message -----
From: "Ron Miller d.b.a. Country TV" <rlmbkm@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, November 25, 2003 9:48 PM
Subject: [TechAssist] KV32V36,strange problem after power supply
repair,won"t power down!
> This set came in D.O.A. has separate power supply pcb.Replaced ( used all
> SONY parts) R607.Q601 602.vdr 601. r622. C613 C613. IC643. D646. IC642.
> D603-610 (8). and the four 22 ohm resisters:609 610 616& 617.Also horiz
> output transistor and soldered drive path.
> Tested at low voltage ( 30-40 vac) no excessive current draw on bench.Put
> into set plugged in set came on with good pix and sound ran it 10 min.
> turned it off and unplugged it checked for overheating, now here is the
> strange thing plugged set back in (set should by in standby ) heard audio
> pop in speakers and HV coming up,looked at filaments and they are lit
pushed
> POWER button heard deg relay and sound no pix turned up G2 and saw faint
> gray raster with line at top. (no vert).Replaced vert output TDA8172 same
> results, anybody seen this?Set will not power down.
> Country TV
> Ron Miller
> Inez, TX. 77968
>
>
>
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