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Posted on Oct 30, 2010
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Toshiba TV Model No. 27HL85 Chassis No. TAC0507 Picture looks like the vertical is off frequency (rolling fast) Sound O.K. I have repaired a lot of CRT type TVs but know little about LCD TVs. Arnold ttv

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  • Master 10,594 Answers
  • Posted on Oct 30, 2010
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Hi,
As you already an experienced tech, picture rolling top to bottom happens in two conditions, either video signal level is weak/ less than standard or video signal is missing vertical sync signal.
Please check does picture roll fast in all inputs of tv?
If yes, then video processor seems bad that is mounted on main board and main board will be replaced and if any specific input gives rolling picture and other input is fine then check bad input's buffer parts like chip resistors, chip capacitors and buffer transistors that might be causing low video signal level.
Hope these info will help you.
Thanks.

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