Question about CTX PV 720 17" LCD Monitor

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Ctx pv 720 lcd monitor backlight drops post plus 30 seconds!


I turn on the monitor and it is fine for 30 seconds or so then then the backlight drops but the images are still there can be seen with external light if i shut it off and turn it back on it will get another 30 seconds etc.
a transistor is obviously bad and I am poor enough to have to isolate it.
ctx pv 720 LCD monitor. how do I fix it ? I can solder and desolder with the best of them.

Comment posted on Dec 03, 2008 I know its gotta be capacitor or power transistor circuit but where exactly is the low power transistor controller

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Hi...there,
The problems on the backlight inverter power supply. Open it up and check all the capacitors, it look like a tiny battery cap on the side had writing on it. (Example 1000uf 16v ) if you are lucky you can spot it right away...with a bulged on top of each caps. If not, just replaced all of the caps... Good luck!

Posted on Dec 07, 2008

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Posted on Jan 02, 2017

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This is what inverter board looks like:
http://www.shopjimmy.com/catalogsearch/result/?q=CTX%20PV720

Look for bad caps also, more likely to need new inverter board, warning, you can have bad lamp assembly also.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net
Capacitors kit: http://lcdalternatives.auctivacommerce.com/

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Hi...there,
You can saved even more repaired yourself. The problems on the backlight inverter power supply. Open it up and check all the capacitors, it look like a tiny battery cap on the side had writing on it. (Example 1000uf 16v ) if you are lucky you can spot it right away...with a bulged on top of each caps. If not, just replaced all of the caps... Good luck!

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Hi...there,
The problems on the backlight inverter power supply. Open it up and check all the capacitors, it look like a tiny battery cap on the side had writing on it. (Example 1000uf 16v ) if you are lucky you can spot it right away...with a bulged on top of each caps. If not, just replaced all of the caps... Good luck!

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