Re: Samsung SyncMaster 204b

Thanks, Davi.p! If I read correctly, you're saying the mosfet is OK? Then, why don't the 4.5 V on the gate (?) suffice to make more of the 5 V on source flow through the mosfet to drain? My apologies if my question doesn't make any sense, last time I tried to learn some electronics theory I was a good 20 years younger…

Later this week I'll replace my old 204Bs, then I can cross-check between the working logic board and this one.

Re: Samsung SyncMaster 204b



Using diode mode, I get "1" from top to bottom left and from bottom left to bottom right – both ways. For top to bottom right I get 1890 with the black probe at the top pin and 368 the other way round.



That would be "LTM201UX-L01", I guess. The panel is OK, as verified using the logic board from the other 204B....

Re: Samsung SyncMaster 204b

selldoo, Davi.p, thanks! The monitor died a slow, flickering death. Since I knew the problem from its sibling, I wasn't too worried. Maybe I killed an IC with a static discharge while removing the power board?

The code on the transistor looks like "TR7 N". I found a datasheet for TR7, which seems to be matching what you wrote, Davi.p:

With the red probe on the top pin (drain?), I get 6,2 kΩ to bottom right (source?) and 51.6 kΩ to bottom left (gate?). With the black probe on the top pin, I get 17 kΩ...

Re: Samsung SyncMaster 204b

Davi.p, thanks for your reply! I've measured as per your post and a few other points: [url]http://s1.directupload.net/file/d/3464/pcgvs586_jpg.htm[/url]Re: Samsung SyncMaster 204b<br /> <..._jpg.htm[/url]

Re: Samsung SyncMaster 204b

Apparently I'm stuck with the same problem as whotopia. I've got two 204B monitors. The first (A) failed years ago, but is working fine since replacement of the caps. Now the second (B) showed the known symptoms. I replaced the caps but the monitor won't power up.

By exchanging power boards and logic boards between the two monitors, I've confirmed both power boards to work fine, but the logic board from B causes the following behaviour: When the mains switch is turned on, the power button LED on the front panel lights up once. Same behaviour...