Samsung 2243NWX black screen
Couple of days ago my Samsung 2243NW LED monitor's screen went completely black with Power blue LED on as if it was ok. Sensor power button was working and could switch monitor on and off without any visuals on the screen...
Detaching/attaching VGA cable from/to the monitor was resulting in computer producing a sound for a device which was unplugged/plugged. So that signaling part was ok.
Never before I tried to repair a monitor. Thanks to this site I have decided to give it a try, anyhow I have purchased a new replacement monitor by then
BADCAPS
After having removed power board I have noticed that 4 caps 820uF 25V were bloated and their measured capacity was way below 20uF. Other capacitors looked ok and their measured value were about right. I could not find 820uF capacitors and replaced them with 1000uf 35V ones of same dimensions.
Dual Enhancement Mode Field Effect Transistor ( N and P Channel)
Examining the bottom of PCB I noticed that area around a SO-8 component was in some kind of amber flux like spots. It looked like this component was soldered after the PCB was made, but someone didn't remove the flux. Nope. After checking that little guy with multimeter, it showed that transitions G-S to D were blown (had 0 resistance). Replaced it with closest match I found IRF7389ЗPbf
BLOWN FUSE
Green 4A 125V fuse was also blown. Replaced it with 4A 250V ceramic fuse. Not sure if it's right replacement voltage wise, but I couldn't find the one for 125V around.
After fixing all that, monitor worked again!!!
Detaching/attaching VGA cable from/to the monitor was resulting in computer producing a sound for a device which was unplugged/plugged. So that signaling part was ok.Never before I tried to repair a monitor. Thanks to this site I have decided to give it a try, anyhow I have purchased a new replacement monitor by then
BADCAPS
After having removed power board I have noticed that 4 caps 820uF 25V were bloated and their measured capacity was way below 20uF. Other capacitors looked ok and their measured value were about right. I could not find 820uF capacitors and replaced them with 1000uf 35V ones of same dimensions.
Dual Enhancement Mode Field Effect Transistor ( N and P Channel)
Examining the bottom of PCB I noticed that area around a SO-8 component was in some kind of amber flux like spots. It looked like this component was soldered after the PCB was made, but someone didn't remove the flux. Nope. After checking that little guy with multimeter, it showed that transitions G-S to D were blown (had 0 resistance). Replaced it with closest match I found IRF7389ЗPbf
BLOWN FUSE
Green 4A 125V fuse was also blown. Replaced it with 4A 250V ceramic fuse. Not sure if it's right replacement voltage wise, but I couldn't find the one for 125V around.
After fixing all that, monitor worked again!!!
Attached Files