2022-06-11

Asus VW223D monitor repair

 This is 22" 16:10 (1680x1050) LCD monitor from 2008. It has CCFL backlight (4 tubes), so power consumption is rather high (55W according to user manual). I suspect this might be power consumption with maximum brightness, as in my test it heats up only a little. While I'll probably won't keep it, I like warm colors of this kind of monitors comparing them to LED/blueish cheap LED-backlight panels.

Disassembly: panel is screwed up to back part, front frame is held by one screw and latches.

Only VGA input




Realtek RTD2554VH



Delta DAC-19M020 power supply, used also in other monitors. Apparently still available (as used products, so it might be hard to predict their expected life time) on aliexpress for less than $10.


When I've tried to turn it on, it only was blinking shortly in regular intervals - pretty typical sign of power supply malfunction or overloading. It turned out to be typical failure, with 2200u/10V capacitors visibly bulging and losing capacity. Other capacitors seemed to be fine when measuring with tester, but I've actually replaced all electrolytic capacitors except for the high voltage one. 


Other problem: not working ON/OFF microswitch (probably because it was the most used one). Metal part soldering was broken and also its latches were streched, so it was only loosely attached. I probably could search for some replacement, but soldering back microswitch metal part and securing it with some epoxy was faster and seems good enough.


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