[TechAssist] Re: !!Help!! Sony Main AA-2D Chassis needed

  • From: Jim Myers <jr.myers@xxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Sat, 04 Jun 2005 12:23:22 -0500

Did you try bringing up the line slowly like you say with the CRT socket 
board removed from the CRT?


********************************
Since 1972                     *
Jim Myers                      *
Telrad Electronics             *
Fort Wayne Indiana             *
********************************


Dale Lubow wrote:
> 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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