[TechAssist] Re: Sony KV27FS100L
- From: Paul <dntwntv@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 3 Oct 2005 12:40:16 -0700 (PDT)
That is pretty much the same chassis. Same 2SKs and same location. Lousy design
on top of everything else about this set, as far as I am concerned.
Paul
Hoyt's TV <hoytstv@xxxxxxxxxxx> wrote:
I don't remember for certain. The 2SKs probably. I think the power supply
was built on the main board to the front of the HOT. I saved the parts in a
bag for future use and here's the list:
2 2SK2640-010MR
1 2SD2634-YB
1 IC MCZ3001D
1 100k resistor to be added as a modification. R651
They didn't tell me to order the IC. I got it just so I wouldn't have to pay
shipping on it later by itself.
Russ Hoyt
Hoyt's TV
Exeter, NH
----- Original Message -----
From: "Paul"
To:
Sent: Monday, October 03, 2005 1:49 PM
Subject: [TechAssist] Re: Sony KV27FS100L
> Russ
> That is an interesting situation. Do you remember if the power supply in
> the Sony had two switching mosfets or not?
> Paul
> Hoyt's TV wrote:
> Paul, Try disconnecting the anode lead and see if it will run.
>
> I had a KV24FS100 that I repaired the power supply and replaced the HOT
> and
> it would then fire up to a lower than normal HV for a few seconds and go
> into shutdown. After a conversation with the Sony Tech at Fultons and
> doing
> the testing he recommended, we decided it needed a HO Transformer even
> though it rang OK.
>
> I put that in and it still did the same thing. That's where the customer
> said "uncle" and I quit working on it.
>
> A few weeks later I got in a JVC (I think) that was doing the same thing
> but
> the power supply was OK. The H wave forms looked exactly the same as what
> the Sony tech said indicated a bad IHVT. The two transformers appeared to
> be
> identical so I put in the new Sony one and got the same results.
>
> For some reason I decided to hook the chassis up to my test jig to see
> what
> would happen. It worked fine on the test jig. I plugged the factory yoke
> back in and it still worked fine and stayed on, without any vertical
> deflection on the test jig of course. But when I hooked it back up to it's
> own CRT it went into shutdown. I unhooked the anode lead and it kept
> running. So there must have been an anode short in the CRT.
>
> I never tried the Sony again to see if it had an anode short because I had
> removed all the power supply and HV parts when I quit working on it.
>
>
> Russ Hoyt
> Hoyt's TV
> Exeter, NH
>
>
> ----- Original Message -----
> From: "Paul"
> To:
> 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 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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>
>
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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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