[TechAssist] Re: JVC AV-32050 lightning damaged
- From: "Leonard G. Caillouet" <lcaillo@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 8 Oct 2002 18:06:42 -0400
Bill, I have two of these pains-in-the-ass in the shop right now. One is
very similar to yours and one I have running but the B+ only comes up to 85v
and the pix is undersized hor & vert. I have the manual, it was not very
expensive but still stumped. have checked and changed everything that I can
imagine creating a problem and then some. I have been told that they are
impossible to fix but was hard headed like you. If you want a copy of the
schematic I can send it by fax or mail.
Leonard G. Caillouet
Service Manager
Electronics World
Gainesville, FL
352-332-5608
352-332-5668 (fax)
----- Original Message -----
From: "Bill Boyd" <billstvs@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, October 08, 2002 5:40 PM
Subject: [TechAssist] JVC AV-32050 lightning damaged
>
> JVC 32" TV
> Model AV-32050
>
> I am in JVC hell with this set.
> I ignored the wisdom of this list and took in a
> lightning damaged JVC. There was no blown fuses,
> burnt traces, or exploded componets. The raw B+
> supply was good but the switched mode was not running.
> I changed IC901 (STR-F6626), Q912, and IC941 (SE135N).
> Then it would click on and off when pluged in.
> Changed bad photo coupler PC901.
> Then relays would close and switched mode would run when
> pluged in. Had 133V on HOT collector but no drive.
> Found bad Q923 and IC101 (9V reg).
> Had HV but no pic or on/off.
> Found bad IC771 (5V reg).
> Then had picture, channel and volume buttons worked but
> could not turn off.
> Found bad Q927 in B+ relay control circuit and Q921 in
> degaussing relay control circuit.
> Now when plugged in relay clicks once and then nothing.
> Switched mode only runs when the relay clicks and there
> are no standby voltages.
> This is the first JVC with this power supply I have worked on.
> If anyone has a schematic they could send me or can explain
> this circuit to me, I would appreciate it very much.
>
> TIA
> Bill
> Bill's TV Service
> Sulphur Springs, TX
>
> PS: I tried an NTE3098 for PC901 and only got 120V B+
>
>
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