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Old 12-18-2007, 08:52 PM
karmaman's Avatar
karmaman karmaman is offline
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Join Date: Mar 2007
Location: Escondido, CA
Posts: 137
Hey guys, there's a pretty big transistor, Q505, that shares a heatsink with Q901 and Q902. According to my multimeter it is shorted, now I haven't taken it off the PCB to test for sure, but every other transistor gave me correct readings without taking it off the PCB (won't have time to fully test it until tomorrow). According to the schematic, Q505 is responsible for H OUT. I'm very hopeful that this is the problem. Fixing this monitor has engulfed me for the last 5 days, it's all I do with my spare time, and I have finals this week :/ probably not very good to be working on a monitor instead of studying. Anyway, if Q505 IS shorted, and it's responsible for H OUT, it would probably be causing the problems I am having right now, amirite?

EDIT: According to the service manual, Q505 is a 2SC5530-01, a Hitachi part. There is no NTE cross for it. I know for a fact Radio Shack won't have it (they never have anything) and I don't think Fry's has it either. Can you guys recommend a replacement that will work? It is a Bipolar NPN transistor, not sure of voltages or anything. I also have a 15" Trinitron in the attic, any chances it might have the same part and I can pull it off there? Will check tomorrow and let you guys know. I'm feeling hopeful right now! There's no way I can pitch this monitor now, I've put about $14 worth of new capacitors in it!

BTW MRX37, thanks a million for the link to the repair manual. Without that, I would have pitched it by now.
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