[TechAssist] Re: Sony KV27TW75 Blowing Q601 and Q602
- From: peggs <peggs@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx, <techassist@xxxxxxxxxxxxx>
- Date: Mon, 25 Apr 2005 21:07:22 -0700
Also check the cap(.47uF I think) in the HDT circuitry.
It usually takes out HOT,but you should throw it in any way
Peggs
At 02:42 AM 4/24/05, Robert Father wrote:
>Hi Pete,
> Replace the VDRs. They are a big problem on Sonys.
>Good Luck
>
>-------Original Message-------
>
>From: techassist@xxxxxxxxxxxxx
>Date: 04/24/05 00:28:48
>To: techassist@xxxxxxxxxxxxx
>Subject: [TechAssist] Sony KV27TW75 Blowing Q601 and Q602
>
>Sony
>KV27TW75
>Chassis LN-1 (very simmilar to the AA-1 in the KV27TS27....)
>MFD 1992
>
>
> Set came in with blown HOT, SW mode transistors and fuse.
>Connections on HDT were ok but wax had melted out of it. Replaced then HDT
>with one from a AA-2 chassis (same #) Pulled flyback (1-439-498-12) it rang
>31 times one I had on the shelf (a leftover that didn't fix another set rang
>46 times) so I swaped it out with the one on the shel. used 2SD1880 (from
>B&D). Used 2SC4834 M instead of 2SC4664 B for Q601 and Q602. Set ran long
>enough to show a picture for a minitue then blew Q601 & Q602 and the fuse.
>Found a service bultien in the filing cabinet to change R647 to 1Ω. But
>is still blowing Q601 &Q602 about a miniute after the picture appears (the
>2nd time used so left over pulls from a power supply C4106 to test) Ideas..
>Caps etc...
>
>Peter Oliver
>Tucson Radio TV
>
>
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