Hi guys. Long time reader and first time poster here. I'm hoping that someone can assist me in diagnosing a faulty motherboard. I'm getting the dreaded power on but not booting + black screen issue. It's for an all in one terminal that has been discontinued, so replacing the motherboard isn't an easy option.
I've noticed that a voltage regulator chip on the board is getting seriously hot. 93 degrees to be exact. Now could it be a matter of swapping the chip, and hopefully having a working board again if the heat hasn't done damage elsewhere, or is it more likely to be a case of something else faulty causing it to heat up.
The regulator in question is a CMPWR 280TN, and the datasheet for it can be found http://pdf.datasheetcatalog.com/datasheet2/a/0scojciwx83zwoj076q14e1qkspy.pdf
I've measured the voltages at each pin and they are as follows:
1 (VSBY) - 5.08v
2 (VCC) - 5.04v
3 (GND) - 0v
4 (VOUT) - 2.45v - (is this a concern?)
5 (DRIVE) - 5.02v
According to the data sheet in the link above, VOUT should supply 3.3v right? Could this be where my problem lies?
If anyone can shed any light on the situation, or maybe suggest any other tests to do, it would be much appreciated. I have quite a successful history of repairing boards through component replacement, but when it comes to knowing exactly how particular components work and what they are supposed to do, my knowledge is a little limited.
Thanks in advance.
James
I've noticed that a voltage regulator chip on the board is getting seriously hot. 93 degrees to be exact. Now could it be a matter of swapping the chip, and hopefully having a working board again if the heat hasn't done damage elsewhere, or is it more likely to be a case of something else faulty causing it to heat up.
The regulator in question is a CMPWR 280TN, and the datasheet for it can be found http://pdf.datasheetcatalog.com/datasheet2/a/0scojciwx83zwoj076q14e1qkspy.pdf
I've measured the voltages at each pin and they are as follows:
1 (VSBY) - 5.08v
2 (VCC) - 5.04v
3 (GND) - 0v
4 (VOUT) - 2.45v - (is this a concern?)
5 (DRIVE) - 5.02v
According to the data sheet in the link above, VOUT should supply 3.3v right? Could this be where my problem lies?
If anyone can shed any light on the situation, or maybe suggest any other tests to do, it would be much appreciated. I have quite a successful history of repairing boards through component replacement, but when it comes to knowing exactly how particular components work and what they are supposed to do, my knowledge is a little limited.
Thanks in advance.
James
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