How to test LCD backlight?

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I suspect the LCD backlights are faulty and cause the Lcd monitor to
shut down the backlight.

Question: If i connect the suspected backlights to  another good 15
inches LCd monitor and turn it on.

Will it damage the  good 15 inches LCd monitor?(both  are HP, 15inches,
but different model and use different LCD panel and different inverter
design. The inverter plug for both of them are  the same. number  of
lamp in the panel is the same)

Will this test whether the backlight is faulty?


Re: How to test LCD backlight?

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I just repaired a KDS monitor with the same problem. Was bad caps in the
power supply...Paul



Re: How to test LCD backlight?
snipped-for-privacy@yahoo.com wrote in news:1162761001.781390.173540
@h54g2000cwb.googlegroups.com:

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It would make more sense to plug the lamps into their original power
supply, turn it on, and measure the voltage coming to the lamps.  You do
have a voltmenter, right?

If no voltage, either fix the power supply, or replace it, with an
original from the monitor's manufacturer, or online, for example, here:
http://www.lcdpart.com/doc/inverter.html

Re: How to test LCD backlight?
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If the inverter is working correctly and you hook your voltmeter up to it
you will probably smoke your voltmeter unless it is rated for about 2 KV
which most arent. Check the fuses on your inverter board, that is a common
failure.





Re: How to test LCD backlight?
Oh and BTY the lamps rarely fail completely. They usually just get dimmer
and dimmer. Odds are the inverter has failed.



Re: How to test LCD backlight?
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Another thing that happens on occasion is the lamp ages to the point
where the inverter shuts down. If it doesn't at least blink once then
the inverter is likely bad though.

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