LG Flatron W2442PA bad caps?

[Pimvb]

Hi all,

One of my monitors just went down a week ago [LG Flatron W2442PA]. I used before going to bed, didn't turn it off, and when i woke up i couldn't get it to power up. The power button doesn't light up either. I've switched cables, sockets, the lot. Nothing works, it seems dead.

I've been reading up on on the topic and found that the most likely causes are bad caps or broken fuse (hence my enrollment on the website). I've read that broken caps can be recognized by bulging tops or leaking 'electrolytes' at the bottom. I opened my monitor to inspect it and found the situation as shown in the attached pictures (specific monitor ID etc also included).

I'm not an expert but it looks fine to me.

basically i have three questions:

1. Do the caps look oke?
2. How can i test them? (preferably without a multi meter, as i don't have one)
3. What other causes can there be?

I hope you can help, all replys are appreciated.

Regards!

Pim

[Rtech]

Re: LG Flatron W2442PA bad caps?

The second photo(which shows your hand),has two large capacitors on the Right side,and just behind them 4 Diodes in line,and you also show the fuse.The first test,would be the fuse,the second would be to measure the Voltage across those caps,and the third would be to check those diodes.YOU DO NEED A METER,and you can be advised how to proceed when you have use of one !!

[Uniballer]

Re: LG Flatron W2442PA bad caps?

1. Do the caps look oke?

None of them appeared to be bulged, but they also don't seem to be good brands.

2. How can i test them? (preferably without a multi meter, as i don't have one)

Desolder them and test them with an ESR meter.

3. What other causes can there be?

Start with the fuse. Check it with the ohm meter you said you don't have. Could be a blown diode or transistor, or a bad transformer winding or optocoupler... I find my old Tek 475A analog oscilloscope, which is very easy to float due to its linear power supply, to be the easiest tool for me when diagnosing SMPS failures (it is politically correct for me to tell you not to purposely defeat protective grounding on any equipment).

Keep in mind that the power supply could (theoretically) be fine, and that the problem could be elsewhere.

[Pimvb]

Re: LG Flatron W2442PA bad caps?

Thanks for the feedback guys, going to get myself a multi meter and start measuring