[TechAssist] Re: Sony KV27FS100L Fixed almost
- From: Paul <dntwntv@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 4 Oct 2005 10:50:30 -0700 (PDT)
I finally found the problem with this thing. The dual diode D615 was shorted.
This I knew and had unsoldered one leg to relieve the short to ground reading.
The problem was the diode was shorted on all three legs and two of the legs go
to windings in the secondary of the power supply. So the windings were
effectually shorted. Removed the diode from circuit and set runs fine. Don't
know if there is a problem with the audio amp I/C that the diode furnishes a
supply voltage for. The diode is on back-order, naturally, so wont know till it
gets in. Love these Sonys.
Paul
Hoyt's TV <hoytstv@xxxxxxxxxxx> wrote: 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"
To:
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 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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>
>
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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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