LG flatron L204ws BLACK SCREEN

[nguberinic]

Thank you all in advance.....

Else what the problem is, power led blue is on and my screen is black (dimmed ???).
I sort of now some of the electronics, have welding tool, etc, have managed to repair my own screen, this one is a friend of mine.....

When looking to a power board where the inverter is everything seems to be ok, I have done some measuremnts and bu following some other threads it seems to be ok....

There are no blown capacitors (at least visualy-which does not mean that they r ok....)

Can you please guide me to what the possible cause could be....or how can I be sure that it;s power supply problem and not the tubes..

So once again, when I power up monitor it shows dimmed LOGO of LG and goes dark in 1 sec....if I play with power button like on/off logo comes out for a second and goes dark again....

1. Should I try with raplacing capacitors or ???

There is a way to test the lead from cord to inverter to tube and back....and really diagnose the problem....

Thanks

[selldoor]

Re: LG flatron L204ws BLACK SCREEN

Its no good saying you tested some things and they were ok.
What did you test and what were the results.
Do you have a multimeter.

[nguberinic]

Re: LG flatron L204ws BLACK SCREEN

ok u have point on that, as sad have tested pins as you guided .....same monitor but not same problem.....https://www.badcaps.net/forum/showth...+L204ws&page=2


this is only thing I have tested, can get out capacitors but my multimeter can go just up to 200 (μF) thees r higher 1000.....just a cheap multimeter...thanks

Maybe a way to check if tubes r any good.....

Thanks again./...help appreciated !!!

[nguberinic]

Re: LG flatron L204ws BLACK SCREEN

sorry again me "transformer" concerning the test....

[selldoor]

Re: LG flatron L204ws BLACK SCREEN

Ok - On the transformer the two test results should be within 3% of each other
were they?

Have you another monitor you can try the bulbs in?

A first test is to plug in the lead from only one bulb then switch on
Does that bulb flash?

Do the same for the other bulbs. Switch off between plugging and unplugging.

This test will ONLY show up a fully broken bulb or its wiring - it will not flash.

[nguberinic]

Re: LG flatron L204ws BLACK SCREEN

1st yes they are 927 +/-5 less then 3%,
2nd dont have another at least dont have the exact same have dell 17' it that's going to do the magic
3rd does the test includes the second monitor or should I do the test on LG that;s broken..???? I assume yes since there I will test one by one...thanks

[nguberinic]

Re: LG flatron L204ws BLACK SCREEN

just done with the test, and the result is same, it flashes for a second/two and displays LG logo and goes down.....same thing as beeing both connected....

[nguberinic]

Re: LG flatron L204ws BLACK SCREEN

I know that with my Dell 17' monitor I had to replace 4 transistor's which seemed to be faulty or not faulty but best to die, also got this from forum, they were first to die with this model, so was wondering maybe same thing, but honestly dont now where to start from and what to measure and when measured what next....???
thanks...

[selldoor]

Re: LG flatron L204ws BLACK SCREEN

[QUOTE=nguberinic;325850...same thing as beeing both connected....[/QUOTE]

There are 4 bulbs in the LG - did you test all 4?

If you can test them in the Dell that would be great - if they light dont keep them on for long say 10 seconds only..

Soldering on the Dell would be very important the LG should be better.
Having said that there were quite afew solder joints I was not sure about.
Can you look (picture4) right hand side the solder on C417 looks completely cracked and same on C411?

[nguberinic]

Re: LG flatron L204ws BLACK SCREEN

have tested all 4 bulbs and they all worked, did not test them in dell but just as previous post... will try it with dell