Re: SyncMaster 2493HM with no picture and solid blue LED

The monitor is working again. I removed some more glue from the board, and after a few attempts at turning it on, it finally did. I'm hoping I actually solved the problem this time and that this isn't just a coincidence.

Thanks again everyone for all your help. Hopefully it'll just keep working this time.

Re: SyncMaster 2493HM with no picture and solid blue LED

I tried flexing the board in that spot and repeating everything as I did when it started working, but still nothing. I do not have a hair dryer, so I haven't tried that yet. I've included some pictures of the power supply that will hopefully be easy to see.

What I've been doing is probing around the power board to look for any active voltages at all. The voltage regulators coming from the sides of the large component in the sixth picture are not outputting anything close to what they should (0.5V or less), but...

Re: SyncMaster 2493HM with no picture and solid blue LED

I think the problem might be with the power supply. I measured the voltages delivered to the inverter and logic boards (on the power board side) and found that the 5V output to the logic board is ~0.5V, and the 24V output to the inverter board is ~100mV. I checked with two multimeters and concluded the same thing. The power switch enable line (the blue wire on the smaller connection to the logic board) was ~3.5V, however.

Could the problem still be a capacitor or is a cold solder joint more likely? None of the...

Re: SyncMaster 2493HM with no picture and solid blue LED



Yeah... so I got up this morning, and it's not working again. Once it started working last night, I didn't have any problems with it. I'm starting to think I should never turn it off for more than 5 minutes.

So this is typical of a cold solder joint? How would I locate that?...

Re: SyncMaster 2493HM with no picture and solid blue LED

The monitor seems to be working again, although I didn't really do anything. While I was measuring the 5V feed to the logic board, I heard a slight click and the backlight came on. I put the monitor back together, and now it's working again.

Thanks a lot for the help! It's hard to find anyone with enough technical experience to diagnose a faulty monitor. I'll definitely be back if the monitor fails again.

Re: SyncMaster 2493HM with no picture and solid blue LED



I checked the fuse and the mosfets and all give readings which indicate they are working (fuse = 0 - 0.1 ohms, each of the 12 readings for the mosfets >= ~4700 ohms).

I'll remove the dried glue tomorrow. Any other suggestions? Thanks for your help so far....

Re: SyncMaster 2493HM with no picture and solid blue LED

Here are the pics of the boards in my monitor and my multimeter. Let me know if any additional pictures would be helpful....

My problem is related to [URL="https://www.badcaps.net/forum/showthread.php?t=14483"]this thread[/URL], but it's over a year old, and my problem is slightly different.

I have the same type of monitor (Samsung SyncMaster 2493HM) with the same basic problem: When I turn it on, I get no picture, but the LED remains a solid blue, which is supposed to mean that the logic board and power supply are working. I, however, don't hear a persistent clicking sound; I only hear one quick "click" when I touch the power button.

I received the monitor as a gift...