Re: Samsung 740n no backlight after cap replacement

After an exhaustive search, I finally found the U202 and U203 MOSFETs. Unfortunately, my DMM does not have a diode test mode. How else can I check if there is a short?

Re: Samsung 740n no backlight after cap replacement



The voltage reading on either side of the fuse is -6V....

Re: Samsung 740n no backlight after cap replacement



Good point. I changed the probes and got a more stable reading:

Touching the probes - 0.4 ohms
F301 value - 0.4 ohms...

Re: Samsung 740n no backlight after cap replacement

Here is my question and the subsequent follow up answers that I received earlier:

My 740N comes on but I see nothing but the blue power light. When I tilt the monitor at an angle, I am able to see that there is something there, just no backlight. Following PlainBill's recommendation, I checked the voltages at CN2 and got the following:

Ground to 13V - 16V
Ground to 5.1V - 5V
Ground to ON/OFF - 2V
Ground to A-DIM - 0V
Ground to B-DIM - 0V

I have already replaced...