19 inch CGA-EGA-VGA-SVGA LCD arcade monitor
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Virtua Fighter 3 marquee
Toshiba PB6643-1 no picture and no hi voltage.
Tested the Horizontal Output Transistor found to be shorted. location Q412
I started thinking what can cause the HOT to short since the HOT turns on the flyback and the 125 volt run through the Horizontal Output Transistor maybe the power coming from the power supply is bad! I started taking the capacitors out and testing them. I found three that didn't test healthy in the power supply.
Cap CQ29 2200uf 25v 105C
Cap CQ41 470uf 25v 105C
Cap CQ15 220uf 50v 105C
I found one more cap that looked bad C416 470uf 35v 105C
So I Powered the monitor back up and it came on! I will try to put it in a game maybe tonight!
Components changed five, cost $7.00
Horizontal Output Transistor Q412
Posted: Fri, 15 Apr 2011