[TechAssist] Re: Sony KV27FS100L
- From: "Hoyt's TV" <hoytstv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 3 Oct 2005 19:15:57 -0400
Yep, I thought they had a pretty good one with that power supply on a
separate board. They had a procedure for troubleshooting that, out of the
set. I could see me having one all repaired, sitting on the shelf waiting
for a chassis to put it in after I replaced the shorted HO transistor that
killed it. I never got enough of those in, to do that.
I don't understand why Sony persists in using power supplies that get wiped
out like that.
Russ Hoyt
Hoyt's TV
Exeter, NH
----- Original Message -----
From: "Paul" <dntwntv@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, October 03, 2005 3:40 PM
Subject: [TechAssist] Re: Sony KV27FS100L
> 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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>>
>> 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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