Hello guys, I have this Samsung S2230N LCD monitor which is not waking up from standby, I've checked a lot of things, but came up short.
So, when you plug the monitor in AC outlet, it starts up and then immediately goes to standby, as if computer is connected, but it is switched off (the computer, that is). Of course, VGA cable is not connected, and there should be Check cable, No signal, or something similar on the screen, but there isn't. When you press MENU button, the panel does turn on, it shows Test Good, in the upper left of the sceen, and then goes off. As I understood, this Test Good thing is normal on Samsung monitors of that vintage.
What I've checked:
-PSU (+5 and +3.3V rails are good, caps are good, voltages are stable)
-Scaler board (no visible damage, all the rails are present, including the 1.8V generated on the scaler board itself)
Monitor is detected when you connect it to the computer, but it shows up as 1024x768 resolution monitor. I was thinking along the lines that there is corrupted flash/eeprom on the board, and that's the reason why it's showing up as wrong resolution, but if that's the case, it should at least show No signal with VGA cable disconnected, right?
Maybe the monitor is detecting that the cable is connected, and that's why it's going to standby, but I couldn't find the schematic, and the only service manual I've managed to obtain contains only partial schematic, for the same monitor model as I have, but the main board covered in SM is completely different, including the scaler chip.
Does anybody have any other idea what should I check?
So, when you plug the monitor in AC outlet, it starts up and then immediately goes to standby, as if computer is connected, but it is switched off (the computer, that is). Of course, VGA cable is not connected, and there should be Check cable, No signal, or something similar on the screen, but there isn't. When you press MENU button, the panel does turn on, it shows Test Good, in the upper left of the sceen, and then goes off. As I understood, this Test Good thing is normal on Samsung monitors of that vintage.
What I've checked:
-PSU (+5 and +3.3V rails are good, caps are good, voltages are stable)
-Scaler board (no visible damage, all the rails are present, including the 1.8V generated on the scaler board itself)
Monitor is detected when you connect it to the computer, but it shows up as 1024x768 resolution monitor. I was thinking along the lines that there is corrupted flash/eeprom on the board, and that's the reason why it's showing up as wrong resolution, but if that's the case, it should at least show No signal with VGA cable disconnected, right?
Maybe the monitor is detecting that the cable is connected, and that's why it's going to standby, but I couldn't find the schematic, and the only service manual I've managed to obtain contains only partial schematic, for the same monitor model as I have, but the main board covered in SM is completely different, including the scaler chip.
Does anybody have any other idea what should I check?
Attached Files
But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. 
I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
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