[TechAssist] Re: sony 32 in.power supply problems
- From: "James M. Knoble" <jmk1938@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 28 May 2002 21:58:07 -0400
replace the small caps in the base and collector of the switching transistors.
At 07:48 AM 5/22/02 -0400, you wrote:
>Tommy,
>
> What is the model # of the set.....that way we can be sure we're on the
>same page.
>
>
> I believe the failure you are describing originates because of a cracked
>solder connection on the H-drive transformer on the base of the horizontal
>output.
>
> Basically if the output is shorted....this is why it did.
>
> Then when the output shorts , it wipes out the 2SC4834 pair in the SMPS.
>
>General rule of thumb on these sets is to resolder all 4 pins on that driver
>transformer , resolder all the TO-220 case style heat sink mounted
>regulators & any other device that generates a decent amount of heat when
>operating.
>
>
>Jeff Stielau
>Shoreline Electronics Repair
>125 Beech Tree Lane
>Westbrook, CT 06498
>860-399-1861
>860-664-3535 (fax)
>jstielau@xxxxxxxx
>----- Original Message -----
>From: <Tommycontact@xxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Tuesday, May 21, 2002 7:56 PM
>Subject: [TechAssist] sony 32 in.power supply problems
>
>
> > i have two of these in the shop with the same problem. ime at home now and
> > dont have model # but ime sure all know of which ones i speak.switch mode
> > power supply 2sc4834,varistors,open load resistor,ect... sets come in
>dead,
> > all power supply components shorted or open,sometimes but not always the
>ho
> > is shorted.replaced all faulty parts ,works great for sometimes 1 day up
>to a
> > week then a complete repeat of failure!help!!!!
> > tommy
> > the electronic shop
> > hot springs , ar.
> >
> >
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