[TechAssist] Re: Sony TV model KV27TS35 - chassis SCC-E65E-A
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 05 Apr 2004 10:02:44 -0500
Did the HOT short again? If yes then the problem is either loss of H
drive or flyback timing. If no then the problem is within the power
supply and you may have a bad match with the 2SC4644's, poor quality
generic parts. Try another pair and check the base or emitter waveform
for a 50/50 duty cycle, or find VDR601, pull it and check it, it must
read infinity ohms. Anything less and it is bad,
*******************************************************************************************************************
Since 1972
Jim Myers
Telrad Electronics
Fort Wayne, Indiana
Ernie - Valley TV & Stereo wrote:
> Hello all:
>
> Having a problem with this set.
> Came in with HO transistor shorted - both regulators (2SC4664) shorted and
> fuse blown.
> Also diode D622 shorted.
> Replaced all the parts, resoldered driver transformer, flyback etc.
>
> Set ran for 30 minutes and blew both regulators again. HO Trans. OK
> Replaced regulators with 2SC4834 and same problem again.
> This set does not have the ususal VDR's in circuit and I have no schematic for
> this model.
> Can anyone help????
> TIA
>
> Ernie Niessen
> Valley TV & Stereo
> 9401 Fletcher St.
> Chilliwack, B.C.
> V2P 4Z4
> Since 1960
>
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