Question about LG L204WT LCD Monitor

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Monitor turned off and now will not restart (Power light flashing rapidly)

I just purchased an LG L204WT. It worked perfectly for a few weeks. After about 2-3 weeks, it bagan to turn off after about 10-15 minutes of use. When the screen turned off, the power light goes to a rapid flash. After the first few times it could be "fix" by unplugging the power. The "fix" only allowed it to remain on for a few minutes before shutting down again. It now will not power on and the power light contines to flash rapidly.

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Re: Monitor turned off and now will not restart (Power...

If your LG L204WT will not power up all of a sudden, or takes long to power up, or dies after a while and it has not been exposed to lightning damage then in all likelihood the Electrolytic capacitors in its power supply has started to fail.
Unplug the unit from mains. To open it up, remove the 4 philips screws at the back. Then starting at the bottom corner use a small flat screw driver to wedge the front bezel loose. After removing the bezel the rear casing will also come off the panel. The circuitry case is taped to the panel with silver tape. Loosen the tape, lift the power supply. Carefully unplug the two sets of backlight cables, and the front panel controls to completely remove the circuitry case. Now remove the 4 screws holding the power board and then replace the following capacitors:
You can order caps from most electronic component stores.
You will need to replace:
C105: Electrolytic Cap, 47uF 50V 105 degrees C
C106: Electrolytic Cap, 1uF 50V 105 degrees C
C202,C206: Electrolytic Cap, 680uF 25V 105 degrees C
C203,C204, C205: Electrolytic Cap, 1000uF 25V 105 degrees C
You can always use a HIGHER voltage and a slightly HIGHER uF, and HIGHER temp rating but never lower.
Make 100% sure to observe the polarity when replacing the caps. Electrolytic caps have a clear negative marking stripe on the side coinciding with a black mark on the board.

Posted on Mar 23, 2013

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Re: Monitor turned off and now will not restart (Power...

Sounds like it is defective or was shocked. See if you can swap it out or contact the manufacturer about repair under the warranty on it.

Hope this helps!

Posted on Nov 27, 2007

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When it's on power off it make's a beeping sound, not one tone but it's fast. and when i am trying to turn the power on it wont start untill i pressed the power on/off button in 4-5 min. and yesterday the...

robin almen, If date code on rear is 2006, you will explor these options: 1 DIY refurbishment of units internal power supply printed circuit board. 2. See if LG (lucky Goldstar) has a cash+old unit swap-out program??? 3. Contract out the repair work. ($30 to $75) 4. Trade L204WT for new monitor. 5. Do some reading in the fixya profiles and follow the links you find there, to see if you might be able to do your own repair. Then visit YOUTUBE for repair video clips, searching using this: "lcd monitor disassembly" and "lcd monitor repair" Now it's up to you! What will you do? What will you do? Bye for now. 12fixlouie

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I'm going through the same thing with a Dell 1905FP - it has 3 bulging capacitors on the Power Supply/Inverter board, and I suspect they are the culprits. At first it delayed a few seconds to start (green power light flashing in all situation), then it took about 10 minutes, then delayed about 45 minutes, then went all the way to about 6 hours - all within a week. When it did come up after the delay, it was perfect. Now it won't come up at all....

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