[TechAssist] Re: Sony KV35S42(AA-2D) - Snaps & shorts H.OUT, Damper Diode & regulator
- From: "Larry E" <videotech@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 18 May 2005 19:16:41 -0400
Dale, this is a shot in the dark but does apply to the AA-2 chassis,
"repeated short of HOT and IC601", check yoke leads inside the connector
for burn marks and loose connections or bad crimp,especially the horizontal
wires crimp to the terminal, Larry E
Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
----- Original Message -----
From: "Dale Lubow" <harristv50010@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, May 18, 2005 11:05 AM
Subject: [TechAssist] Sony KV35S42(AA-2D) - Snaps & shorts H.OUT, Damper
Diode & regulator
> I am working on a Sony KV35S42 with a AA-2D chassis. Came in with
> H.output(2SC5148), IC601 regulator & damper diode(D502) shorted. I then
> replaced H.output, IC601 regulator, damper diodes(D502, D503 & D504), C511
&
> flyback checked Ok. When I turned it on it made a loud HV snap and all
parts
> shorted again. I called Sony tech. assist, he suggested changing the
> flyback. I then replaced all the parts listed plus the flyback.
>
> First I checked the B+ before I connected the H.output and it was 135V.
> The horizontal circuit times out perfectly with my Sencore TVA-92.
>
> This time the HV came up for about 5 seconds, I heard a loud snap & a
> bright flash near the H.output transistor and all the parts shorted again.
I
> find no trace of arcing near the H.output, so maybe the flash was a
reaction
> of the transistor shorting.
>
> I took the yoke off and looked for any sign of breakdown and checked for
any
> shorts across windings. I checked the picture tube & the emission is ok.
>
> The CRT could be breaking down when the HV comes up but I have never had
> this short one of the two parallel dampers each time it happens.
>
> Does any one have any idea what might be going on?
>
> TIA,
> Dale
>
>
> Dale A. Lubow C.E.T.
> Harris TV & Appliance
> 335 Lincoln Way
> Ames, IA 50010
> 515-232-1109 (Voice)
> 515-232-3356 (Fax)
> HarrisTV50010@xxxxxxx
>
>
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