820-4924 3 beeps as in ram problem

2click

Member
Hi, I have this board beeping 3 times

Voltages on U7400
6= 1,8
12= 5,1
16= 3,3
17=3,2

This board was messed with before, because it had a short on the line PPDDR_S3_REG_R caused by a bad resoldered ram, I changed the 4 chips, but it is still giving me the 3 beeps...
I messed up a little with the ramcfg resistors but put them back again...
 

2click

Member
I reflowed the ram and now it is turning on, but the fan is going hi inmediately, I changed the smc, but made no difference... what sensor makes the fan go high?
 

2informaticos

Administrator
Staff member
Try first disconnecting webcam.
Next, change trackpad board/flex.
Also try known good RIO board/flex.

Run HWMonitor and check for strange temps reported.
You can make an idea about which bus is affected.

Starting in diagnostic mode, can also display usefull information.
 
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