vaswaniraj
New member
Hi Group,
I have a 820-2936 -B logic board where when I plug in the charger I get the green light but the fan does not spin. I tried measuring all the components with PPBUS_G3H, and everywhere I get is 12.56 volts. Also on further measuring the power rails I found the following that PP5V_S3 every component instead of showing 5V is showing Zero (0) volts. I presume that the problem is in the S3 power rails. On further troubleshooting I figured out that U7200 chip the voltage on Pin 12 which is a S5 rail it should measure 3.3V but it only measures 1.295V. I presume that the U7200 chip is bad. Again on further troubleshooting I found out that the PP5V_S0 should have 5 volts but does not 5V. Am I correct in my troubleshooting steps. Correct me if I am wrong. Can anyone please advice what further steps is to be taken in order for me to make this board working. Thanks in advance.
I have a 820-2936 -B logic board where when I plug in the charger I get the green light but the fan does not spin. I tried measuring all the components with PPBUS_G3H, and everywhere I get is 12.56 volts. Also on further measuring the power rails I found the following that PP5V_S3 every component instead of showing 5V is showing Zero (0) volts. I presume that the problem is in the S3 power rails. On further troubleshooting I figured out that U7200 chip the voltage on Pin 12 which is a S5 rail it should measure 3.3V but it only measures 1.295V. I presume that the U7200 chip is bad. Again on further troubleshooting I found out that the PP5V_S0 should have 5 volts but does not 5V. Am I correct in my troubleshooting steps. Correct me if I am wrong. Can anyone please advice what further steps is to be taken in order for me to make this board working. Thanks in advance.
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