Re: Philips 32PT563S w/ Horizontal Short Issue
- From: b <reverend_rogers@xxxxxxxxx>
- Date: Mon, 25 Aug 2008 10:10:06 -0700 (PDT)
On 24 ago, 08:58, "Tom Tom" <sometom...@xxxxxxxxxx> wrote:
I am looking for help to find short that develops in the horizontal section
of a Philips 32PT563S37G (Chassis L01.1UAC-7638).
When the TV was first going out, it would be difficult to turn on. It would
take several attempts at turning on to get it to stay on. It started with
the right side of the screen wavering along the edge and somewhat folding
over on itself. As the TV would be turned on repeatly it would eventually
settle down and stay on and be ok. Then finally one day the TV died and the
HOT (horiz output transistor) shorted out (zero ohms across all junctions).
This wavering on the edge of the screen only happens on the right, never on
the left.
I've replaced the HOT twice with a NTE2636 - can't locate a true replacement
for the BU4508DX - I can only get the BU4508AF which doesn't have the Re and
damper diode built-in. I have replaced every electrolytic capacitor in the
TV that's on the main board (not any on the SSB or CRT yoke board), along
with two PNP (BC32725 & C557B) & two NPN (BC33725 & C547B) transistors. The
electrolytics were all replaced with the same manufactuer - I got them all
from Mouser.com. And yes, I did replace the capacitor 2455 along with the
NPN/PNP transistors nearby.
While I had the HOT out of the TV I tried checking the flyback (part #
OV2076) windings with an ohm meter. I used a diagram for a HR8380 as a
reference. I was getting some low ohm readings on the primary and secondary
voltage output for video and other circuits - the readings were around 1 to
2 ohms. I tried checking the ohm reading on the HV output side and wasn't
getting any shorted out or low ohm reading - and I don't recall much of any
reading on higher ohm ranges.
The right side of the screen was developing a wave along it (not straight)
just before it died the last time. The TV only lasted for about 15-20 mins
before the HOT shorted out again. Now there is a high pitch ticking sound
from the TV when the power cord is plugged in.
I'm waiting for a Sams Photofacts to arrive for this - but could use any
help / advice about the right side horizontal issue.
Thanks,
Glenn
the highland electrix site has a long list of common philips faults.
-B
.
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