diyAudio (
-   Parts (
-   -   Electrical Transistor question??? (

sbisdabomb 6th April 2005 06:16 PM

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,

sbisdabomb 6th April 2005 06:52 PM

It's a transformer not a transistor.

thomas997 6th April 2005 11:54 PM

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.

sbisdabomb 7th April 2005 05:51 AM

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.

All times are GMT. The time now is 09:49 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2