[TechAssist] Re: Sony KV27TW70 shuts off when I attach cablesignal
- From: "Vilhelm Boor" <villyboor@xxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx, techassist@xxxxxxxxxxxx
- Date: Tue, 08 Oct 2002 09:36:09 0000
Villy boor
boorelec Durban
Have had a few Sony's with saomewhat similar, was a tube cathode heater short.
Had to overcome by isolating the heater.
--
On Tue, 08 Oct 2002 01:14:23
kevinstv wrote:
>
>I had a Panasonic with a smiliar problem. With the cable disconnected the
>set worked fine, but with the cable connected it would shut off. The
>problem turned out to be the B+ regulator allowing the B+ to go too high.
>Sounds like your Sony has the same symptoms.
>
>I think hooking up the cable loads the B+ down because the TV has to work
>harder to produce a dark picture. I remember turning the screen up and the
>TV would stay on with the cable connected. With the screen turned down the
>TV would shut down with or without the cable connected. HTH
>
>Kevin Wilks
>Kevin's TV and Video Repair
>Penticton BC Canada
>kevinstv@xxxxxxx
>----- Original Message -----
>From: "Wally Heise" <sirepair@xxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Monday, October 07, 2002 10:02 PM
>Subject: [TechAssist] Re: Sony KV27TW70 shuts off when I attach cable signal
>
>
>>
>> Hi Bill,
>>
>> A thought, maybe the high voltage is too high, causing it to shut down.
>> This could especially be true after changing the flyback. I'm not
>familiar
>> with this set, but does it have a hv adjust pot?
>>
>> Wally Heise
>> South Isle Repair
>> Isle, Mn.
>> sirepair@ecenet
>>
>> ----- Original Message -----
>> From: "Bill Grabowski" <bgrabowski@xxxxxxxxx>
>> To: <techassist@xxxxxxxxxxxxx>
>> Sent: Monday, October 07, 2002 10:08 PM
>> Subject: [TechAssist] Sony KV27TW70 shuts off when I attach cable signal
>>
>>
>> >
>> > I repaired this Sony's power supply and Horiz section and after
>> > completion I brought the AC up slowly and check for current on the
>> > isolation meter as always and everything was fine at full line voltage
>> > so I applied signal and within a second or two and the set went into
>> > shutdown. Would anyone have a clue if I should start at the power supply
>> > or the Horiz section. I did replace the flyback and H.O.T. and went over
>> > driver connections along with all solder that looked poor. I don't
>> > remember anyone having a similar problem like this with any brand. Any
>> > help would be greatly appreciated. Thanks much!!!
>> >
>> > P.S. The chassis power supply and Horiz are still working but AC has to
>> > be interrupted and set will stay on indefinitely with out cable signal.
>> >
>> > Bill Grabowski
>> > Triangle Appliance
>> > Kenosha,WI
>> > bgrabowski@xxxxxxxxx
>> >
>> >
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