[TechAssist] Re: Sony KV27FS100L

I could not find the original problem listed,  but I had one shut down and
R598 off pin 9 of  IHVT open  .47ohm 1/4 watt found nothing else wrong.
Its posted in WinStips
Phillip R Hull
phil245@xxxxxxxxxxxxx
FAX 517--569-3075
Professional Technicians only
----- Original Message ----- 
From: "Paul" <dntwntv@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, September 30, 2005 2:27 PM
Subject: [TechAssist] Re: Sony KV27FS100L


> 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
> >
>
> --------------------------------------------------------------------------
---
> > This Email List is accessible to the general public through search
engines.
> > Remove: http://www.tech-assist.org/remove.htm
> > Set Vacation
> > mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> > Lost Password: http://www.tech-assist.org and select "Login Problems?".
> > Email Archives: http://www.freelists.org/archives/techassist/
> >
> >
> >
> --------------------------------------------------------------------------
---
> This Email List is accessible to the general public through search
engines. Remove: http://www.tech-assist.org/remove.htm
> Set Vacation
mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> Lost Password: http://www.tech-assist.org and select "Login Problems?".
> Email Archives: http://www.freelists.org/archives/techassist/
>
>
>
> Paul ,B
> Central TV&Video
> 911W Grand Ave
> Grover Beach Ca.
> (805)481-8084
>
> --------------------------------------------------------------------------
---
> This Email List is accessible to the general public through search
engines. Remove: http://www.tech-assist.org/remove.htm
> Set Vacation
mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> Lost Password: http://www.tech-assist.org  and select "Login Problems?".
> Email Archives: http://www.freelists.org/archives/techassist/
>
>


-----------------------------------------------------------------------------
This Email List is accessible to the general public through search engines. 
Remove: http://www.tech-assist.org/remove.htm
Set Vacation mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
Lost Password: http://www.tech-assist.org  and select "Login Problems?".
Email Archives: http://www.freelists.org/archives/techassist/

Other related posts: