Hi!
I've got a problem with my DELL U2412Mb. The logic board has been grilled via USB in a power outage, all caps had 0Ohms and some SMD components were grilled.
Only option was to buy a new board.
I've got another working DELL U2412Mb here, so before I ordered a board from ebay, I cross checked which part is broken with parts from my other working monitor and it is the logic board. There's no chance that it is a power board, panel/Tcon or cable problem, I tested the components with the display controller from my other monitor and the setup is working like a charm.
Unfortunately there seems to be a problem with the used logic board I bought on ebay. I built it in and tested it but there is no signal on the LVDS cable. The backlight lights up but the screen stays black, it doesn't show a "no signal" message or anything else. When I press the "Input" button on the monitor, the backlight turns off for a second and turns on again which is the expected behavior, so the board doesn't seem to be 100% bricked.
The fuses on the logic board F1 to F5 are all fine. In another thread some guy said that it could be a problem with the signal that tells the panel to switch on. I found two voltage regulators on the board, a DH (?) 61-12 and a DH 17-33. My first idea would be to measure the voltage on the output of the regulators, does that make sense as a first step?
I want to wait until I've got a statement from the seller who said that the board has been taken from a working system. I'm from the EU and the seller is from the States, so there is only a little chance of a return.
Video Board: 4H.1GH01.A10
Panel: Samsung LTM240CL01
Thanks and best wishes
Tofu
I've got a problem with my DELL U2412Mb. The logic board has been grilled via USB in a power outage, all caps had 0Ohms and some SMD components were grilled.
Only option was to buy a new board.
I've got another working DELL U2412Mb here, so before I ordered a board from ebay, I cross checked which part is broken with parts from my other working monitor and it is the logic board. There's no chance that it is a power board, panel/Tcon or cable problem, I tested the components with the display controller from my other monitor and the setup is working like a charm.
Unfortunately there seems to be a problem with the used logic board I bought on ebay. I built it in and tested it but there is no signal on the LVDS cable. The backlight lights up but the screen stays black, it doesn't show a "no signal" message or anything else. When I press the "Input" button on the monitor, the backlight turns off for a second and turns on again which is the expected behavior, so the board doesn't seem to be 100% bricked.
The fuses on the logic board F1 to F5 are all fine. In another thread some guy said that it could be a problem with the signal that tells the panel to switch on. I found two voltage regulators on the board, a DH (?) 61-12 and a DH 17-33. My first idea would be to measure the voltage on the output of the regulators, does that make sense as a first step?
I want to wait until I've got a statement from the seller who said that the board has been taken from a working system. I'm from the EU and the seller is from the States, so there is only a little chance of a return.
Video Board: 4H.1GH01.A10
Panel: Samsung LTM240CL01
Thanks and best wishes
Tofu
Attached Files
Problem solved! 
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