[TechAssist] Re: RCA P56938 (PTK195S16P chassis) intermittent excessive brightness
- From: "James M. Knoble" <jmk1938@xxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 22 Jan 2003 18:37:15 -0500
check for a sandcastle pulse. It is a combination of a vert and a hor=20
pulse,so if the vert or hor pulse is missing the sandcastle pulse will be=20
incorrect and give the symptoms you describe.
At 10:17 AM 10/2/2002 -0400, you wrote:
>I have an RCA P56938 (PTK195S16P chassis) with excessive brightness most of
>the time but no retrace lines. Chipper Check revealed error code of 136
>indicating Y Pr Pb processor fault and Thomson Tech Assist recommended that
>I replace the Y Pr Pb board (part# 249116) which was done without any
>difference. I now have the chassis (light box) in the shop and have also
>replaced the signal IC (ref# U16201 - part# 241266 - LA7612N) which right
>after replacement was fine and then within a couple of hours went back to
>the excessive brightness again and has remained so. I have tried tapping=
the
>boards, heating, freezing, and resoldering the plugs with no success. It is
>the same regardless of any or no input. Not quite sure where to go with=
this
>one so I thought I would ask if anyone has been here before?
>
>Bob Waterman, CET=AE #RI-28
>Master Technician License #9109
>Service Manager
>Gemini Computer, TV, & Security Alarms
>(508)695-7302
>(508)695-7769 FAX
>geminitv@xxxxxxxxxxxxxxxx
>geminitv@xxxxxxx
>
>
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James M. Knoble
2303 Pleasant Valley Road
Fairmont, WV 26554
jmk1938@xxxxxxxxxx
Phone 304-366-1938
Fax 304-367-8965 =20
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