[TechAssist] Re: fix?Sony KP41EXR96, dead, clicks. G board parts shorted
- From: "Intrepid Video Support" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 24 Sep 2004 23:50:39 -0400
Phil,
You may have missed two diodes...check the last two hear below for leakage:
SONY \KP53XBR35\Dead. Relay Clicks\(Unit has a light box)\\\Replace Shorted
Q614* D605* D621*
D623\\\\\\\\
Jeff
--
Intrepid Video TV/VCR Repair
263 S Front St, Steelton PA 17113
717-939-7708; (F) 717-564-4952
www.intrepid-video.com www.tech-repair.net
----- Original Message -----
From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, September 24, 2004 9:45 AM
Subject: [TechAssist] Re: fix?Sony KP41EXR96, dead, clicks. G board parts
shorted
I replaced the below mentioned 2 shorted parts on the power supply "G"
board (Q614 and D605), resoldered the board as well.
Powered up the set. Picture looked good, but a slight distortion, or
narrowing on left side about an inch, then after about 15 seconds, the
convergence "flickered" way out several times, so I quickly unplugged
the set, saving my parts.
On the "D" convergence board in front, I replaced both convergence IC's,
both STK4278L (8-749-923-16).(the two converg. fuses were good)
resoldered all other IC's as well. A tech said replace a known failure
cap c1742 on D board(470mfd) between IC905 and IC906 3 terminal regs.
Now, unit powered up and display stayed good until I turned it off 30
min later to close shop.
The STK convergence IC's were likely failing and took out the diode/reg
on the G board.
Phil Bader
Phil Bader wrote:
>Customer said the picture distorted, appeared to be "double", or an
>"outline" just before it went dead.
>Not sure it she describes a horizontal, or convergence effect.
>On the convergence board, the two conv. fuses are OK. All the low ohm
>resistors on the board OK
> I removed the power supply "G" board, (burried under a scan board) and
>bench checked it, locating two shorted parts:
>Power transistor Q614 (C4582), and a 3 leg "common anode" dual diode
>D605 (D10SC6MR).
>I checked all over and no other parts appear shorted or open. The D605
>appears to output to the set's "-18V" source to connectors G2 and G7.
>Don't know what the negative 18V does.
>Any history on these parts failing, or suggestions of elsewhere to look?
>Ten years old.
>Sony PTV's seems to have a knack for smokingthe same newly installed
>parts...
>Phil Bader
>
>
>
--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
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