EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: cpuxxx on January 13, 2020, 07:56:09 am
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i bought 30v, 5 amp power supply. I see in youtube videos people junction power to power rail to find which chips or components shorted. When you give some power to rail, the components which have problem start heating up so they understand component is shorted and must be removed. My power supply has Short Circuit Protection feature and when i junction power to see which components would heat up and shows me but Short Circuit Protection prevent it and cut power off power supply. So should i disable Short Circuit Protection or anything else to do ?
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It is not wise to trace shorted faults by using power and hope to find a hot spot ,
The reason is if it is a true short you will find the tracks and any other parts in line will heat up and possible burn making things worst.
The way to trace it is to use a ohm meter and isolate areas by cutting connections and or tracks.
That is after a good visual inspection of the components and tracks to see if any clues are there.
Any capacitors that are out of shape take them out !
Trev
:)
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It is not wise to trace shorted faults by using power and hope to find a hot spot ,
The reason is if it is a true short you will find the tracks and any other parts in line will heat up and possible burn making things worst.
The way to trace it is to use a ohm meter and isolate areas by cutting connections and or tracks.
That is after a good visual inspection of the components and tracks to see if any clues are there.
Any capacitors that are out of shape take them out !
Trev
:)
Indeed, the "high power" method could have some unexpected / unwanted outcomes.
A better approach and big time saver would be feeding the output with limited power, keeping voltage and current to levels where they are unlikely to do more damage, then shooting it with a thermal cam.