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Old 02-09-2020, 10:58 PM   #1
rattlesnake
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Join Date: Dec 2017
City & State: Buenos Aires
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Exclamation FLATRON E1942 blinks on and off

Hello community,

This monitor turns on and off very quickly upon connecting the AC adapter (tried two, tested 19v).

I can see the LG logo on the screen for a split second, then turns off and on constantly in less than 1 second intervals. There's a high pitch noise while the stand by light/screen is on.

I looked at the capacitors, only removed the big one
1NBKJ
33
100V

Measured it, it was fine. Anyway replaced it with a new one, and no luck.

Just to test, unplugged the CCFL. Plugged the AC adapter. It stays on, the high pitched noise remains (some IC? coil?) and I can turn it off manually.

Any help will be greatly appreacciated!
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Old 02-10-2020, 10:11 AM   #2
R_J
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Default Re: FLATRON E1942 blinks on and off

This monitor uses LED's for the backlight, not CCFL's. How did you "measure" the 33f/100v cap? Check that D105 is not shorted. There are also a few fet's I believe that are on the rear of the board, Q101~Q108, check that none of them are shorted.
You can also monitor the return voltage on the plug going to the led's. with the monitor off, monitor the voltage on pin#1 as you turn on the monitor, then do the same for pin 2, 5 & 6.

Last edited by R_J; 02-10-2020 at 10:39 AM..
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