[TechAssist] Re: Sony KV27FS100L

If the customer is moving get out of it.

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


Paul wrote:
> The pulses are  about 4 or 5 hundred p/p. I scoped it at the
> collector of the HOT, but with only 47v I didn't expect much else.
> The slow start circuitry that you mention seems to fit what is going
> on.This set is Mar. 2004. I have been checking the scan derived
> voltages to see if something could be the cause there, but haven't
> found anything yet. The markings on the chassis are not helping
> either. I have found mismarked components and the 6's,8's and 9's are
> hard to tell the difference. Then to make matters worse the customer
> is moving and wants the TV today. Love this business! Paul Wayne
> Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx> wrote: What do the horizontal
> pulses look like? If you can't probe the collector of the horizontal
> output transistor probe a secondary.
> 
> I haven't paid attention to the actual startup of these, but there
> are several sets now that are using a "slow start" in the horizontal 
> section. They will typically run the output transistor at 20Khz or so
>  for a couple of seconds then drop down to 15K and the set comes up
> at full power. It uses the start up time to determine if all supplies
> are coming up. I don't see the audio supply being monitored anywhere.
> 
> 
> 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
> 
> 
> Paul wrote:
> 
>> 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 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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> Paul ,B Central TV&Video 911W Grand Ave Grover Beach Ca. 
> (805)481-8084
> 
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