[TechAssist] Re: Philips 27PT6442 Chassis L04.1U.AA Horizontal tearing
- From: becyn <becyn@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 17 Nov 2005 10:49:48 -0500
Almost sounds like a bad filter cap in the LV supply , which will allow
rectified pulses on the DC,distorting the deflection waveforms
Jim McVey
McVey Alltronix
327 Broadway
Newburgh N.Y. 12550
"If it doesn't play...
CALL MCVEY !!!!!!"
Factory authorized
service for over 20
major brands.
845 561 8383
(Last of the Mohegans)
Wally Heise wrote:
>Greetings,
>This will be my last attempt to fix this dog. It has horizontal tearing,
>jagged edges on sides, video flickering back and forth, throughout the
>display. This is more noticeable in the center 2/3 of the crt, but is
>everywhere and unacceptable. The original problem with this tv was blown
>degaus thermistor, which I replaced with the new Philips replacement per their
>instructions. I have the Force schematics for this set but still am at a lose
>on where to look for this problem. I have also checked the updates for this
>model per Force 32 and they are correct. I have also replaced the hv flyback.
>
>I notice the Vertical deflection pulse has horizontal frequency parabolic
>signal ringing through the low side of the signal. This parabolic signal has
>an amplitude of about 15 volts peak to peak. I haven't worked on one of these
>flat screens before and am not sure if these pulses are meant to be there for
>p/c or some kind of dynamic focus like monitors use.
>
>Anyone have any ideas or suggestions?
>
>Thanks,
>
>Wally Heise
>South Isle Repair
>Isle, Mn.
>
>
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