[TechAssist] Re: !!Help!! Sony Main AA-2D Chassis needed
- From: "Ron Miller d.b.a. Country TV" <rlmbkm@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 4 Jun 2005 12:04:01 -0500
Did you replace the 0.47uf @ 50vdc connected to the base of the horiz drive
transistor??It will cause this type of problem.HTH
Country TV
Ron Miller
Inez, TX. 77968
----- Original Message -----
From: "Dale Lubow" <harristv@xxxxxxxxx>
To: "TechAssist" <techassist@xxxxxxxxxxxxx>
Sent: Saturday, June 04, 2005 11:47 AM
Subject: [TechAssist] !!Help!! Sony Main AA-2D Chassis needed
>I have been working on a Sony ModelKV35S42 for over a month. Basically
> what happens is when you turn unit on it comes up for several seconds
> then you hear a loud snap. Then you find the Q502 H.output shorted,
> either damper diode D502 or D503 shorted, power supply IC 601 shorted
> and R607 open. I then replaced T503 flyback, Q502, IC601, D502, D503,
> D504, C511 & C513. After replacing these parts I checked the flybacks
> pulse width & load with my Sencore and it was perfect. I then fired it
> up again and it snapped and shorted all the same parts again. I talked
> to Sony about it and they suggested I replace the shorted parts and
> slowly bring up the line voltage while monitoring the flyback pulse,
> B+ & HV. everything looks perfect until the B+ gets to about 110V,
> then the trailing edge of the pulse starts to distort where it
> contacts the base line and the HV starts going down a bit while the
> H.Output starts getting hot. I did change the T501 H Driver
> transformer, Q501 H. Driver & C502 in Q501's base circuit. I still
> have the same problems with the pulse distorting & the H.Output
> getting hot. I have checked every part in the H.output stage, H.Driver
> stage & Pincushion stage.
>
> I was wondering if anyone possibly has a chassis AA-2D out of one of
> the following models, KV-32S42, KV-32S66, KV-32V42, KV-35S42, KV-35S66
> or KV-35V42.
>
> The number on the original flyback is 8-598-809-00 which should help
> to identify the right chassis version.
>
> TIA,
> Dale
> --=20
> Dale A. Lubow CET
> Harris TV & Appliance
> 335 Lincoln Way
> Ames, IA 50010
> 515-232-1109 (Voice)
> 515-232-3356 (Fax)
> HarrisTV@xxxxxxxxx
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