Hello,
Sometime I used to repair desktop motherboard also.
Today I found there is low voltage in PSON pin which is less than 1.5v, which is not turning on because there should be 3.3v, when i short green-black cable on SMPS, wow the display comes.
I checked 5v STANDBY voltage which is ok after than I found there is AMS1117 which should be voltage regulator in my opinion. In other board it just converts 5v STANDBY to 3.3v STANDBY for SIO.
I changed new AMS1117 still there is less than 1.5v, changed SIO chip still SIO is generating less than 1.5v to PSON.
Can anybody assist me to find out the exact problem.
Sometime I used to repair desktop motherboard also.
Today I found there is low voltage in PSON pin which is less than 1.5v, which is not turning on because there should be 3.3v, when i short green-black cable on SMPS, wow the display comes.
I checked 5v STANDBY voltage which is ok after than I found there is AMS1117 which should be voltage regulator in my opinion. In other board it just converts 5v STANDBY to 3.3v STANDBY for SIO.
I changed new AMS1117 still there is less than 1.5v, changed SIO chip still SIO is generating less than 1.5v to PSON.
Can anybody assist me to find out the exact problem.
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