Long time lurker, first time poster. Thanks in advance for any insight anyone might have!
One of my friends gave me his Samsung T240 display because it stopped working. I said I’d look into why this might be happening. He’s actually purchased a new monitor, so this is mostly just an experiment, but I’d sure like to find out why this problem is happening. I have been referencing these posts (https://www.badcaps.net/forum/showth...highlight=T240, https://www.badcaps.net/forum/showth...highlight=T240), but my problem appears a little different.
Symptoms:
The monitor turns on for a second or two, displaying the Samsung logo. However, shortly thereafter, the backlight turns off and the screen won’t display a picture. I can get similar behavior to occur when hitting the ‘source’ button. It doesn’t look like the backlight is totally out because it would ever light the panel, if that was the case. During the problem, the power light on the front is on.
Here is a youtube video of what is happening: http://youtu.be/7u-i_inT2RE
What I have done so far:
Component Conditions:
One of my friends gave me his Samsung T240 display because it stopped working. I said I’d look into why this might be happening. He’s actually purchased a new monitor, so this is mostly just an experiment, but I’d sure like to find out why this problem is happening. I have been referencing these posts (https://www.badcaps.net/forum/showth...highlight=T240, https://www.badcaps.net/forum/showth...highlight=T240), but my problem appears a little different.
Symptoms:
The monitor turns on for a second or two, displaying the Samsung logo. However, shortly thereafter, the backlight turns off and the screen won’t display a picture. I can get similar behavior to occur when hitting the ‘source’ button. It doesn’t look like the backlight is totally out because it would ever light the panel, if that was the case. During the problem, the power light on the front is on.
Here is a youtube video of what is happening: http://youtu.be/7u-i_inT2RE
What I have done so far:
- Currently, I have the panel disassembled and have looked over the power supply. The panel is only 2-3 years old and was very well taken care of. The caps look to all be in very good shape.
- I have checked for shorts on U202 (see last picture, small 5-pin in middle), none.
- I have checked for shorts on the other IC, none.
- I WANT to check if T301 is okay, but don't know how to test. Can't find data sheet, either.
Component Conditions:
- No apparent bad caps (no bulging, leaking from top or bottom)
- No big burn marks on any components
- Slight browning of the PCB’s underside (trace side), though nothing looking too drastic
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