Sorry to ask you guys a computer question again...

[MRX37]

Like I said before: Don't give up.

Bad caps alone won't cause the horizontal to fail to my knowledge. it's usually a bad cap that makes whatever controls the horizontal fail.

You're also lucky to actually have access to a FREE service manual. Most times you don't get that lucky.

If you're getting frustrated, stop working on the monitor for a day or two.

If you can find replacements, it wouldn't hurt to replace Q901 and Q902. Replacing them won't hurt anything as long as they're replaced with the same part, and at the very least, you can rule them out.

[karmaman]

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.

[MRX37]

Originally Posted by karmaman

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.

Q505 sounds like it's VERY likely to be your problem.

Input the part number into google and see if you can order it online.

The 15" trinitron is unlikely to have that specific transistor in it. It might, but don't get your hopes up.

If you can get a replacement, test the resistors and caps around that transistor. It's likely that a bad resistior or cap made the transistor fail, and you wouldn't want to put in a new one just to watch it fail 5 minutes after you power the monitor up.

EDIT: you're welcome, and I'm glad I could help.

Being the owner of a 19 inch Viewsonic flat screen CRT monitor that had intermittant HV failure when I first found it, I know fixing a monitor is not fun, but it's damn rewarding when you fix it.

EDIT 2: I think this is your part.

[karmaman]

That is indeed the part. Thanks MR37. For some reason, I was unable to find it just by googling. We're leaving on vacation in a few days and won't be back for two weeks, so sadly it'll have to wait until next year. I'm just going to try and get it out of my mind for a while, otherwise for the entire two weeks it'll be eating away at me. I will definitely order the part from bluestar if I don't find one in the 15" Trinitron (which, like you said, seems unlikely, but I will check anyway).

EDIT: I have to order at least two, bringing the total price to $10, and then the shipping is $9 (!). For something that could easily be mailed in an envelope?! There's no way my parents will let me buy this, they'll me to toss the monitor Better start searching locally, or call bluestar and see if they can take a money order so my parents won't find out how much I paid.