This ultra compact PC wont power on.
It has been replaced with a more modern cyber-secure PC (i.e. one that supports Windows 11 as this is a 4th Gen i5) so although technically it's not worth repairing, I would like to use this as a training opportunity to see if (with your help) I/we can fix it as that way I can learn something from a computer with a genuine fault...
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On plugging it in to my bench power supply it starts to draw around 160mA whereas from the other Ultra Compact PCs I've successfully fixed it should be only drawing around 40mA - pressing the power button does nothing and there is no change on the current draw.
The CMOS battery was dead so that has been replaced but it still wont power on.
I've had a good look under the microscope and can't see any liquid damaged etc.
Here are the DMM readings (in diode test/continuity setting) of the coils:
On the other side of the board my Thermal Camera shows that one IC is getting hot:
A quick Google and an IT8773GN is an ITE SIO chip.
I've check the capacitors around the IT8773GN chip and none appear to be shorted.
=======================================================
Are the coil reading OK?
What fault-finding should I do next?
Thanks.
It has been replaced with a more modern cyber-secure PC (i.e. one that supports Windows 11 as this is a 4th Gen i5) so although technically it's not worth repairing, I would like to use this as a training opportunity to see if (with your help) I/we can fix it as that way I can learn something from a computer with a genuine fault...
=========================================
On plugging it in to my bench power supply it starts to draw around 160mA whereas from the other Ultra Compact PCs I've successfully fixed it should be only drawing around 40mA - pressing the power button does nothing and there is no change on the current draw.
The CMOS battery was dead so that has been replaced but it still wont power on.
I've had a good look under the microscope and can't see any liquid damaged etc.
Here are the DMM readings (in diode test/continuity setting) of the coils:
On the other side of the board my Thermal Camera shows that one IC is getting hot:
A quick Google and an IT8773GN is an ITE SIO chip.
I've check the capacitors around the IT8773GN chip and none appear to be shorted.
=======================================================
Are the coil reading OK?
What fault-finding should I do next?
Thanks.
