[TechAssist] Re: JVC AV32D200 Dead Need some help
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 15 Dec 2003 01:43:30 -0500
Al, I just repaired the same model set with similar symptom this past
week. When power button pressed, the red light would come on but the set
wouldn't start up.
Check the B+ pin on the flyback (next to the HOT collector pin). Press
the power button and see if the B+ rises. ON my set, it went to 76V dc
for a second then died out. There are two wire jumpers in parallel
leading to the flyback B+ pin from the power supply. Disconnect these
jumpers then measure the B+ on the power supply side of the jumpers.
Mine ran at 135V. The flyback was the culprit. My HR flyback tester
agreed with that theory- it showed a bad collector waveform on the
scope). Global had the flyback in stock for $74.00 CDN. Fixed the set.
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
Al Gutz wrote:
>
> This one has me stumped. Set is totally dead, no fuses were blown and
> HOT was not shorted.
>
> This model is the supply using the STRF6626, 2 opto-isol, and 2sd2088
> transistor.
>
> When plugged in all I get on STRF is raw DC of 165V on pin 3 and on pin
> 4 the 16V supply slowly varies from 16V down to about 10V then slowy
> increases back to 16V, on the sd2088 I have 10V on all three leads and
> about 12V on the opto PC901.
> I have replaced STR and sd2088 and opto-iso and 2 1000u caps C911 and
> C926 and checked every part in both primary and secondary, (where
> questionable out of cct).
>
> Connecting scope to STR show no pulse of any sort.
> Tried connectiong my 16V supply to pins 3 and 4, then the STR will osc,
> when I do this all my secondary supplies have voltage on them, it low
> becacuse supply is only 16V but they all work.
>
> Would anyone have a print of this set?
>
> If it was a smaller set I would just tell cust not worth repair.
>
> Thanks for any good ideas of information
>
> Al G
> Al's TV-Electronics
> Pembroke Ont.
> Canada
>
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