Question LG Flatron W1942S power issues

Jul 22, 2019
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Hello! I'm troubleshooting an LG Flatron W1942S LCD monitor. It didn't power on, sometimes after unplugging and plugging it back in several times it showed the LG logo for a second or less, and back when it worked the colors were off. I disassembled it and noticed several capacitors were swollen, so I changed all the electrolytic capacitors on the power supply board. Only one capacitor is different now, the 450v 68uF is now 450v 100uF. Now the image quality is better than when it was new.

But after being unplugged overnight, when I plug it in, the power button is unresponsive, somethimes with its light on, sometimes completely off. If I unplug it and plug it back in, it immediately begins to work perfectly. Then you can turn it off and on, unplug it and plug it in again, whatever you do it always starts up normally and with a clear image.

What should I check?

Thank you.
 

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