[TechAssist] Re: SONY KV35S66 CHASSIS AA-2D need print
- From: Panday <dpanday@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 12 Jun 2003 20:00:25 -0400
Jorge,
I have send you off list a few tips.
Hope it helps'.
Good luck.
Panday
>
> From: Jorge Camboni <geo@xxxxxxxxxxxxx>
> Date: 2003/06/11 Wed PM 08:34:20 EST
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] SONY KV35S66 CHASSIS AA-2D need print
>
>
>
> >
>
> Hi techs. I'v been struggling with this (exceptionally) heavy
> Sony KV35S66 set at the customer's home.
> apparently, there is a problem with the vertical output. The output
> IC is a TDA8172 and it is fed by +15 -15 volts originated in separate
> flyback secondary windings. The PROBLEM ITSELF IT IS THAT
> THERE IS NO PIC, NO RASTER unless you advance the G2 control,
> the voltage on the 3 colour cathodes being over 200v (no video drive at all)=
> ..
> but when you advance the G2, the picture is a milky rainbow pattern
> just like the old magnavoxes with one of the vertical psupplies bad,
> because there is a 9VOLTS DC BIAS across the vert. yoke (there's
> actually no vertical deflection, just a strong dc bias on the yoke)
> and the set is protecting itself cutting any video output. ...
> Well, I changed the tda8172 first.. no luck, then rechecked
> both power supplies and they are somewhat asymetrical, the
> positive being 11.6v and the negative 16.5v, that is quite a difference
> but resistor, diode and caps are just fine on both, and unless on of
> the flyback windings is bad, IT SEEMS THAT THE POSITIVE
> POWER SUPPLY IS BEING DRAINED MORE HEAVILY, hence
> the voltage difference. I checked all I could at the customer's location
> and in this case I am unable to bring it to the workshop. I suspect the=
> jungle
> IC but I wont=B4t spend that money unless I am pretty sure of it. Need the
> schematic to go deeper into matters, but I had to give him a rather low
> estimate in order to do the job (big mistake)
> If anybody could help with a print, or a clue on this case, I' d appreciate=
> it
> very much
>
> TIA Jorge
>
> Jorge Camboni, GY Electronics, Richardson, TX
>
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