Repairing Samsung 713N LCD Monitor
with SE7889-LF Ic Problem.
This Samsung 713N LCD monitor came in with no display symptom and no power.
In other words, once you switched ‘on’ you could see the power LED lights up (no
display) and then for couples of seconds the power led light goes off. When I removed
the signal cable and switched ‘on’, now I could see the check signal cable OSD
appeared at the screen. This proved that the inverter board, lamp and power supply is
working. Again, I plugged in the signal cable, the display and power LED light went
off.
After opened up the cover, I check the on/off signal from the mainboard to the
inverter board. With signal cable in, there was no on/off signal to the inverter board
but when the signal cable was disconnected, you could see clearly from your meter
there is a on/off signal going into the inverter board thus the display appeared with the
check signal OSD present at the display. From this test, it is very obvious is the main
board problem.
To confirm whether is the main board problem, you have to use a similar Samsung
713N model to confirm it. True enough, after substitution with a known good board,
the monitor is okay. So now we can confirm is the mainboard faulty. The real
problem now is at where we can find this board or the suspected part number SE7889LF ic for replacement? Checking the components surrounding the SE7889 ic yield no
result.
As mentioned in previous articles, to troubleshoot LCD monitor is easy but to get the
part is a little bit difficult. Samsung don’t sell you the mainboard, if you send to them
for repair, they will charge a very high price which is not worth to repair.
As I’m writing this article, I still could not locate the suspected ic, but if I found it I
will let you all know. Samsung 510bn lcd monitor also have this kind of problem
which is the mainboard spoilt.
Although in this article I could not pinpoint to you the exact faulty component, at least
you would use my procedure to confirm which board is giving problem. In other
words, whether you are troubleshooting the Samsung 713N LCD monitor or other
brand, the testing method is the same.