Hello all, I have a Samsung model 2233SW monitor that is a 2009 model year. The monitor started flickering intermittently one afternoon, then upon power-up the next day, it turned on, flashed, and went black. The image is there, visible with a flashlight, but screen is black. If I cycle power to monitor, it will light up for about a second, maybe less, then goes black.
I have read through some posts on this forum regarding similar problems with other monitors (same model) and I am not having much success at repairing my monitor. I have replaced most of the caps on the board hoping for a quick cheap fix. I would have replaced all but the large capacitor on the board, but the kit that I ordered (the kit model number was correct) did not include all of the same capacitor values that my board has. I replaced capacitors and re-soldered some questionable looking solder connections but the monitor has the same symptoms as before.
I temporarily place the board back into the assembly and measured some voltages (12 pin and 5 pin) with power on and power off:
Terminal number: power on / power off
1: 5.13V / 5.15V
2: 18.27V / 17.02V
3: GND
4: GND
5: 5.16V / 5.17V
6: 5.16V / 5.17V
7: 5.15V / 5.16V
8: 2.83V / 0v
9: 3.307V / 3.31V
10: 2.636V / 0V
11: 1.789V / 1.806V
12: 1.789V / 1.806V
1: GND
2: 1.796V / 1.807V
3: 1.795V / 1.807V
4: 2.636V / 0V
5: 3.309V / 3.311V
I also took some measurements on the transformer with the board taken out of the assembly. The terminals are not labeled well, but I had some inconsistent readings. What I think are the secondary pins, measured almost exactly the same (1.162 k ohm and 1.163 k ohm) On what I think is the primary side, I get .2 ohm between the first two, .3 ohm between the next two, and anywhere between 2.50 to 8.55 M ohm between the next two pins. The reading changes and is much different each time I measure it.
Does this describe a bad transformer?
If so, where do I find one?
There are other threads on this forum with photos that look exactly like my board, I will attempt to attach some pics showing mine.
I hope this monitor can be fixed, as I really liked it when it was working........
Any help would be appreciated.
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I have read through some posts on this forum regarding similar problems with other monitors (same model) and I am not having much success at repairing my monitor. I have replaced most of the caps on the board hoping for a quick cheap fix. I would have replaced all but the large capacitor on the board, but the kit that I ordered (the kit model number was correct) did not include all of the same capacitor values that my board has. I replaced capacitors and re-soldered some questionable looking solder connections but the monitor has the same symptoms as before.
I temporarily place the board back into the assembly and measured some voltages (12 pin and 5 pin) with power on and power off:
Terminal number: power on / power off
1: 5.13V / 5.15V
2: 18.27V / 17.02V
3: GND
4: GND
5: 5.16V / 5.17V
6: 5.16V / 5.17V
7: 5.15V / 5.16V
8: 2.83V / 0v
9: 3.307V / 3.31V
10: 2.636V / 0V
11: 1.789V / 1.806V
12: 1.789V / 1.806V
1: GND
2: 1.796V / 1.807V
3: 1.795V / 1.807V
4: 2.636V / 0V
5: 3.309V / 3.311V
I also took some measurements on the transformer with the board taken out of the assembly. The terminals are not labeled well, but I had some inconsistent readings. What I think are the secondary pins, measured almost exactly the same (1.162 k ohm and 1.163 k ohm) On what I think is the primary side, I get .2 ohm between the first two, .3 ohm between the next two, and anywhere between 2.50 to 8.55 M ohm between the next two pins. The reading changes and is much different each time I measure it.
Does this describe a bad transformer?
If so, where do I find one?
There are other threads on this forum with photos that look exactly like my board, I will attempt to attach some pics showing mine.
I hope this monitor can be fixed, as I really liked it when it was working........
Any help would be appreciated.
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