[TechAssist] Re: Sony projection model KP 41EXR96 no power
- From: "D PANDAY" <dpanday@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 26 Jul 2002 09:40:27 -0400
This a list of all the common fault on Power supply I have:
1.KP41EXR96
DEAD, BROKEN
CONNECTIONS & CRACKS
AROUND T608 ON THE G
BOARD
Solder-bridge cracks and resolder connections
around T608.
2.KP41EXR96
SHUT OFF BY PROTECT
MODE, REPLACE FBT
Voltage checks showed g board supplying +115
and other supply voltages but no high voltage
being developed. Disconnecting N-5 connector
allowed set to power on and stays on. Resistance
test of flyback transformer showed shorted primary
winging. Replacement of T803 restored normal operation.
3.KP41EXR96
NO POWER FROM G BOARD
(PWR SPLY), REPLACED
T601
Checked T601, pin 11-15 and pin 12-16. They
measured 345uh and only 3 rings using sensor Z
meter. A good transformer reads 2.95mh and has
100 rings. Replacing T601 restored the power
supply.
I hope it helps'.
I do not a copy of the schematic to loan, however I can
send you the Operation of the power supply.This tell's you
how the power supply works.
Panday
>From: Ttkirkpat@xxxxxxx
>Reply-To: techassist@xxxxxxxxxxxxx
>To: techassist@xxxxxxxxxxxxx
>Subject: [TechAssist] Sony projection model KP 41EXR96 no power
>Date: Thu, 25 Jul 2002 23:50:34 EDT
>
>
>Set was completely dead. On the G board ( power supply ) D605 and Q603 were
>shorted. Replaced with originals. Now have 324v on the collector of Q603
>and
>about 225v on the base and emitter of Q603. No relays click and I still do
>not have the 115v source or other secondary sources coming from the
>transformer T601. I do not have the service manual for this so I would
>appreciate any assistance. Also flyback and horizontal circuits are fine.
>Thanks for your help from Mike at the Video Center e-mail
>ttkirkpat@xxxxxxx
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