Question about Televison & Video
There could be either loose connections or cold solder joints in the set that are not behaving the way they should. Please do the hard reset and the whacking test first of all to clear the obvious.
HARD RESET: Unplug the power cord for 4 hours. When you power back up the internal soft codes will automatically be reset to the factory default settings. Then, go to the OSD and reset the features as you had them before.
WHACK: Just perform a little physical violence to the set. Whack or pound on the cabinet all around during its "bad" time with your hand or fist. The physical vibration will usually wakeup the poor connection or cold solder joint and restore the picture.
If the reset and whacking help, then you may be able to find some creative smackeroo that will keep it working reliably. Some have found a small book or magazine under one of the corners of the cabinet will put enough twist on the chassis to keep it working fine.
If the reset and the whacking do not help then you will need the services of a trained tech.
The lines you describe are probably retrace lines during the vertical rescan and are supposed to be kept out of view by the vertical blanking circuit. If this diagnosis is correct, the repair, if not solved by the reset or the whacking, may involve a new IC or repair of the circuits around the vertical processing IC. The cost of repair could be as low as $200, but a definitive diagnosis is necessary to determine for sure.
You may need to replace the 120k resistor on the green video output module. Resistor is located next to the green video output transistor (has heat sink). If you replace it with a 1/2 watt carbon type, it will probably never happen again. I always replace the same resistor on the red and blue video boards at the same time.
Hope this helps you make the right decision.
Should you have any further questions, please feel free to post them here.
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Posted on Oct 04, 2008
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Posted on Jan 02, 2017
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