[TechAssist] Re: Philips 27PT6442 Chassis L04.1U.AA Horizontal tearing
- From: "al m" <ampm@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 17 Nov 2005 07:57:19 -0500
Don't know how jagged the picture is but is the ground from the DAG on the
CRT. Have seen pictures bend without that connected. Just a thought.
Al Marquardt
ampm@xxxxxxx
Al Marquardt Electronic Repair
206 W Main
Girardville Pa. 17935
----- Original Message -----
From: "Wally Heise" <sirepair@xxxxxxxxxx>
To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, November 16, 2005 11:34 PM
Subject: [TechAssist] Philips 27PT6442 Chassis L04.1U.AA Horizontal tearing
> 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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