This is a 2nd go round with this problem for me. Last time it was under Svc Agreement and covered. The tech explained it as a common problem. I'm rather experienced in electronics repair (25 yrs. avionics, CAT scanners & MRI's). I just need to know what parts to replace and what sort of calibration may be necessary. Would it be easier and better to replace the entire blue convergance PCB, or the discreet components. Please guide me with part numbers and where to access them.
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Thats the classisc sign that you need to replace both convergence ICs. You will need two Convergence ICs STK392-120 and then six resistors they are RK42 3.3 ohm 1watt, RK46 1.5 ohm 1watt, RK50 2.7 ohm 1watt, RK54 1.5 ohm 1watt, RK58 3.9 ohm 1watt, RK62 1.8 ohm 1watt. You can get replacement ICs and resistors at the following link and they provide free instalation instructions with pictures so you can repair the set yourself. Heres the link. http://servicemanuals.vstore.ca/
Theres a short somewhere in the set. Most likly the HOT is shorted or the vertical IC has caused this in the past. In one case I had shorted convergence IC cause this symptom.. This set is solid state and there are no user serviceable parts inside so please call a trained tech to assist you with this problem Good Luck