[TechAssist] Re: Sony KV27FS100L
- From: Paul <dntwntv@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 30 Sep 2005 11:27:03 -0700 (PDT)
I don't think the vertical I/C that I replaced was bad. The problem seems to be
that the B+ never gets up to 135v. It makes about 47v then shuts down and goes
into standby. I found a dual diode that was shorted in the secondary but it
supplies the audio amp and removing it did not make any difference in the low
B+ problem. Unless the secondary needs an exact load in order to run, I am at
a loss to know what is going on.
Paul
Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx> wrote:
I have seen a number of sets that, when the vertical IC fails it takes
out the video processor. Check for vertical drive out of the processor.
Pins 28 and 29. These are complimentary sawtooth waveforms, about
1.2v pk-pk.
Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Pensacola, Fl. 32506-3310
Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com
850-456-5995 voice
850-458-6369 fax
Leonard Caillouet wrote:
> Four blinks can be either vertical or horizontal or something else that
> causes the vertical output to not work.
>
> Leonard Caillouet
> Service Manager
> Electronics World
> Gainesville, FL
>
> ----- Original Message -----
> From: "Paul"
> To:
> Sent: Thursday, September 29, 2005 8:39 PM
> Subject: [TechAssist] Sony KV27FS100L
>
>
> How reliable are blink codes? This set is becoming more of a problem than I
> first thought. The blink code is four, indicating a problem in the vertical
> circuit, as I suspected before getting the service manual. I replaced the
> vertical I/C as the most likely cause per the self diagnostics. Problem
> remains, that being the set tries to start but never makes enough B+ and
> goes into stand by. I removed the HOT and replaced both switching mosfets.
> Nothing has changed. I have checked the lytics in that circuit, and supply
> resistors. Nothing shorted or low to ground on the B+ line.Haven't found
> anything bad yet. When I took the back off and saw that the chassis was the
> one that has bad tact switches I headed there first. Anyone familiar with
> this chassis and this problem?
> Paul
>
>
> Paul ,B
> Central TV&Video
> 911W Grand Ave
> Grover Beach Ca.
> (805)481-8084
>
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Paul ,B
Central TV&Video
911W Grand Ave
Grover Beach Ca.
(805)481-8084
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