I have this problem with a Viewsonic pf775. The horizontal size started expanding. I turned it off for a few minutes, turned it on again and it was back to normal. After a while it became expanding again. I tried to reduce it with the horizontal size control. I went to min size and the monitor suddenly went dead. Opened it and found TDA8172 was burned along with a diode next to it. As far as I know TDA8172 is a vertical deflection circuit, but the problem I encounterd was with the horizontal size. I already ordered the chip, but I am afraid that the problem may be more serious than this chip alone. Does anyone have any suggestion? Will appreciate any information. Thank you.
Peter
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