Reply 40 of 137, by PC@LIVE
pentiumspeed wrote on 2021-11-20, 23:01:
Borrow a lab adjustable power supply and thermal camera. Set it up for 1V and 3A or more on the shorted rail and image the res […]
Borrow a lab adjustable power supply and thermal camera. Set it up for 1V and 3A or more on the shorted rail and image the rest of board for anything hot with this camera. This is important when you find correct power rail that is shorted.
This what I have set up at work for locating shorted component for the phone repair. I recently fixed a USB storage drive this way. This was a capacitor shorted next to the controller glowed. Not on the 5V or other rails.
Generally, resistance of the short determines how easily seen on thermal imager. Very low ohm resistance tend to trip the over current on the power supply so need to insert 1 ohm 5W resistor in series to get enough watts flowing properly.
Thanks very interesting what you suggest.
Unfortunately I have no friends or acquaintances who have the same hobby for electronics, indeed many of those I know do not appreciate what I do.
Unfortunately, I believe only a few have similar equipment, repair workshops have become quite rare, I often had difficulty in finding spare parts, so much so that now I only order them from the Internet.
Thank you for the suggestion of the 1OHm 5W resistor, unfortunately I don't know how to measure the temperature, not having something that can fit.
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