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Samsung TFT monitor 713BM

Hi. This monitor has a strange fault. When switched on without signal the screen illuminates and the "check signal cable" display moves around the screen as it should. However, when I connect a signal, I get a brief screen of garbled lines (very brief indeed) then the backlights go out. The power LED also goes off, though it comes back on again, but with no display.

I have checked the various capacitors on the PCB with an ESR meter, also the power supply in the same way. The voltages coming from the power supply appear correct.

Has anyone experienced this fault? The RGB signals go to a SE7888 i.c. which appears to drive the screen. I assume at least part of this is working due to the no signal display being good. Is it possible that something has failed internally in this i.c.? Could the solution be simpler than that (my experience has shown these chips seldom fail)

Does anyone have one laying around in a scrap monitor?

Thanks.

Reply to
Clyde
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Is the computer perhaps set to a display resolution that the monitor doesn't support? I have some older LCD/TFT monitors that don't support over

1024x768 (one doesn't support over 800x600!), and they simply will not show video at anything higher.
Reply to
Brenda Ann

Hiya, it's a 17 inch monitor, about years old. I believe it's native resolution is 1280x1024 which is what the computer is currently set at. I will just try it at VGA resolution but the symptoms have been the same right from boot up.

I am not sure about the i.c. and to replace it will cost me over £20, which is possibly more than the monitor is worth. The i.c appears to be the same as SE7889, it looks to be a Samsung part. Have just got hold of a circuit diagram for this section so will be checking a few voltages and signals around this IC but I have a feeling it's faulty on the input side.

Reply to
Clyde

That's a healthy sign.

That could indicate that you supply an out of range signal. Either too much resolution or too high a refresh rate. (640 x 480 should be fine, but at more than 60 Hz some LCDs still prefer to stay asleep :-)

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Kind regards,
Gerard Bok
Reply to
Gerard Bok

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