[TechAssist] Re: JVC - 35" TV HORIZ WIDTH, B+low
- From: <fremur01@xxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 6 May 2005 10:38:54 -0400
The followups are much appreciated. Initially I checked regulator
IC901 for shorts...none found, measured 164vdc across cap
C910, just a tad bit high.
Back to the suggestion about Q943, I do suspect problems as transitor
test's showed...0 gain. Q944 is a digital, testing it also. ESR'
on Cap C926 was good, but I think value has drifted.
Am currently looking for a Q943 replacement. I recall once a tech
mentioned problematic smd's after power surge on JVC's.
Fred
MTS Electronics
fremur01@xxxxxxxxx
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of Leonard Caillouet
Sent: Friday, May 06, 2005 9:05 AM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: JVC - 35" TV HORIZ WIDTH, B+low
The regulator is running if it has secondary voltage. If those transistors
are the ones in the feedback circuit that is likely a good tip. Low B+ on a
JVC is often in that area.
Leonard Caillouet
Electronics World
1261 NW 76 Blvd
Gainesville, FL 32606
352-332-5608
FAX 352-332-5668
----- Original Message -----
From: "Eric Manuel" <tvman@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, May 06, 2005 9:00 AM
Subject: [TechAssist] Re: JVC - 35" TV HORIZ WIDTH, B+low
Hi Fred chech this out.Also replace C926-1000x50 volts in the power
supply..Eric
jvc av35955 lightning--dead replace ic901, error amp, and
opto, also check q943-944--nasty nasty--those 2 xistors will throw you
Eric
E M Electronics
Deer Lake Nfld
Canada
tvman@xxxxxxxxxxxxxxx
fremur01@xxxxxxxxx wrote:
> Hello,
>
> This set was orig. brought in as dead unit, replaced opto and got it
> to fire up. It now has pic, but horiz width is lacking. A fellow tech had
> a partial scan of the p/s circuit which I've reviewed for test points,
> I recall him saying it's a GV chassis.
>
> Measured B+ at 95vdc, should be 134vdc. I'm checking the smd's and caps
> closely.
> Does anyone have case history on this unit? Trying to determine whats
> pulling the B+ down. Feedback from ASC's would be appreciated
>
> JVC MDL: AV35955 HORIZ WIDTH
>
> Thanks,
>
> Fred
> MTS Electronics
> fremur01@xxxxxxxxx
>
>
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