1st Check beep on
FL53
FL60
L22
L20
R111
2nd check resistance
R134
R59
R58
R70
3rd check tracks
TP21
TP22
TP23
TP24
To 1608A1 ( U2 )
And C255 to C304 to u2
4th check caps short or damage
C14
C15
C255
C304
C204
C272
C281
C31
5th check voltage
C272 ( 5v )
C255 ( 5v )
6th check
D7
L2
If all okay then Reball/Replace Big power ic (u7 )
Don't forget to check the tracks on u7