[tvservice] Re: Philips TP3669 TV Chasis 36Z500-7563
- From: "Jan Duvenhage" <csccomp@xxxxxxxx>
- To: <tvservice@xxxxxxxxxxxxx>
- Date: Fri, 13 Feb 2009 09:21:24 +0200
Hi Jim,
It?s definitely a PSU problem, common problem is the ?Kick Start? circuit
fails which comprises 2 high value (+100K) ¼ - ½ watt resistors(depending on
screen size),these resistors supply a low voltage pulse to the Fet?s at
switch on and over time the value increases significantly to the point where
switching the set of even for extended periods won?t help, these same 2
resistors also drains to ground at switch of to remove any ?floating
voltages? from the smoothing caps in the PSU , hence if the set was working
on and off and you switch it off and then back on again nothing will happen,
but over a period of 5 ? 10 minutes the voltages around drains away. Some
variants of sets might have different configurations but normally the
standard is 2. The fuse not being blown is a good sign and doesn?t point to
any short circuit devices(Diodes,Fet?s) .
Good luck
J.D.
_____
From: tvservice-bounce@xxxxxxxxxxxxx [mailto:tvservice-bounce@xxxxxxxxxxxxx]
On Behalf Of Jim Bailey
Sent: 11 February 2009 11:48 PM
To: tvservice@xxxxxxxxxxxxx
Subject: [tvservice] Philips TP3669 TV Chasis 36Z500-7563
Hi, I've got a Philips TP3669 TV - Chassis 36Z500-7563
Set would not turn on after the power went out. On two previous occasions I
have unplugged it for 5 minutes and it reset and worked fine. This last
occasion the power did not go completely out, the lights just dimmed. The TV
was not on at the time, but now the set is completely dead and it won't
reset like it used to. I did hear a small click when it was plugged back in.
I know others have had the same problem with this model. I'm figuring it's
something in the power supply. Fuse is good, I didn't see any obvious signs
of destruction inside. Is this an easy fix? Which part usually fails? Is it
worth fixing? Where should I take measurements to determine the problem? Any
help would be most appreciated before I just go and buy a new TV, but I hate
to if this one is repairable. I'm no longer in the repair field, but am OK
with most repairs.
Thanks in advance,
Jim (vcrfix@xxxxxxx)
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