[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 17:03:49 -0500
On the "AV" board. See the following:
Part Number Reference Number Description Symptom Code Section Code PCB
Reference Defect Code Repair Code
871999133 "D103,4" DIODE ISS133T-77 1111 PSU AV A A
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: Wednesday, November 26, 2003 12:11 PM
Subject: [TechAssist] Re: KV32V36,strange problem after power supply
repair,won"t power down!
> IC 641 is not turning all the way off, good call have ordered one.Were is
> D103 & D104?
> Country TV
> Ron Miller
> Inez, TX. 77968
>
> ----- Original Message -----
> From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Wednesday, November 26, 2003 6:27 AM
> Subject: [TechAssist] Re: KV32V36,strange problem after power supply
> repair,won"t power down!
>
>
> > 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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> >
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