Question about Philips 200S4SS (Silver) 20.1" LCD Monitor

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Power problem with LG L204WT Flatron

Hello, friends!
This is the situation:
My monitor is about 2 years old. When I try to turn it on, no matter if it is connected to a computer or not, it just starts a very quiet electrical noise and thats it. But after it stays like this for 20 minutes for example, when i unplug the power cable and put it back again, it starts(used to start) normaly! And works fine till i turn it off, or it goes to "power save mode"... and then the same thing over again.(it works only when i start the power by the cable, not by the power button!)
But now its been two days, and that method doesn't work anymmore... i try to turn it on... starts a noise, but quieter than before, and nothing can make it work properly.
Any ideas ? I hope that's reparable :(
Thank you in Advance!

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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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Unique_m_m, Your LG l204WT has a possible bad "switch-mode-power-supply"/"CCFL inverter circuit" that will need to be repaired. The sound that you hear can only come from the circuits mentioned. The SMPS supplies dc voltage to the INVERTER supply and it changes it to a high voltage ac to light-up the "cold-cathode-fluorescent-lamps" (2) that are hung on the reverse side of the lcd panel you look at. You will need a tech type to investigate the units SMPS/inverter board for bad (swollen,leaky) electrolytic filter capacitors and "cold, frosty looking solder joints of the surface and through hole mounted electronic parts soldered to the circuit board. Here is cost to repair. DIY if handy with soldering pencil would be less than $20. Farm out the repair $35 to $65
More if new replacement board is required. I would certainly get on PHILLIPS case and yell and scream about their product's poor quality and short lifespan. Let us know if they give you the "bird"and a "you bought it you own it toyota" attitude. A service life of only two years is totally unacceptable! You could ask phillips if they have a refurbished unit swapout program?? Let us know what happens by doing additional comments to original posting. Bye for now. 12fixlouie

Posted on Jan 31, 2010

  • magicyoum Dec 21, 2010

    I had exactly the same problem. Changed 5 capacitors on the power supply board that were swollen, now the monitor work like a brand new! Cost about 5$ Thank you very much!

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Posted on Jan 02, 2017

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