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Old 6th April 2005, 06:16 PM   #1
diyAudio Member
Join Date: Dec 2004
Location: fort collins, co
Default Electrical Transistor question???

I'm from the DIY projector fourms on this site and have a question I thought you guys might beable to help me with.

I have an LCD monitor that I bought broken, backlight doesn't work. I found a surface mounted transistor on the inverter board of the LCD that was humming, looks to be arcing internally. I can't find the actual transistor anywhere (jameco, mouser, digikey, and some others) as expected. The transistor outputs somewhere between 500-2800 volts, and my multimeter can only measure up to 500v. There is an identical transistor on the board and I was wondering if I could put a resistor accross the one that was working - so it ouput less current and voltage, and then calculate what it acutally ouput so I could attempt to find a replacement transistor.

If I'm totally off base here, or in way over my head just let me know.

Thanks in advance guys,
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Old 6th April 2005, 06:52 PM   #2
diyAudio Member
Join Date: Dec 2004
Location: fort collins, co
It's a transformer not a transistor.
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Old 6th April 2005, 11:54 PM   #3
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thomas997's Avatar
Join Date: Feb 2004
Location: Vancouver
Is the cold cathode bulb good?

Chances are the transformer will be the same as the ones found in cold cathode computer light inverters.

You can try applying a smaller ac voltage to it and measuring the output to find the ratio.
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Old 7th April 2005, 05:51 AM   #4
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Join Date: Dec 2004
Location: fort collins, co
yeah the cold cathode is in good shape, it's the transformer that's shot. My buddy is an EE major and has access to all sorts of tools, I think I'm gonna take it to the lab with him and see exacty what it outputs. but any help is still welcom and appreciated.
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