Mirage PI-170DTLA

[giovanni-oliveri]

Hello I have a Belinea 1905 S1 19" LCD monitor and the screen is going off after about 1 minute.
The green led on the front panel stay on, and if I turn the monitor off and turn back on it will work for other minute or so.
The power supply board model is Mirage Electronics PI-170DTLA Rev:A
I already have change all the capacitors on this board and nothing have change (except for the hissing sound that have disappeared).

Please help

[RethoricalCheese]

Re: Mirage PI-170DTLA

2 things I want you to check if it is possible.

If you have spare CCFL lamps, that are working 100% sure, try using those. If they do not turn off after a couple of minutes, your lamps are not in a good shape and atleast one of them needs replacing.

For the second test you need a multimeter.
Turn the multimeter in the area that reads up to 2k (2000) ohms. Find out where the transformer´s secondary pins are and see what the resistance between them are. Do it with both of the transformers and tell us the results.

[giovanni-oliveri]

Re: Mirage PI-170DTLA

Thank you I will check those asap.

Ciao

[sabre504]

Re: Mirage PI-170DTLA

Schematic

[giovanni-oliveri]

Re: Mirage PI-170DTLA

Ok I got some finding: after adjusting the brightness and contrast around 20 (max 100) the monitor is working great, no flickering no turning off no hissing sound. I have tested for about 3 hrs and is ok. I guess the CCLF lamps are getting weaker and the inverter is cutting power because of that.
I hope this could help some one with a similar problem.
Thank you.

[RethoricalCheese]

Re: Mirage PI-170DTLA

That is just a temporary fix. I would recommend you to take care of the problem in the near future.