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6. 3.3V/5V problem
3.3V/5V/12V problem
Change D/D Board
Check +3V power line
7. VTT problem
VTT problem
VTT-GND Shortage?
N
Check PU502,PL502,
PR505,PL505,PU505
Y
+3V OK?
N
N
+3V_P OK?
Y
Check D/D board,
+3V_P power line
U502,PQ502
PU502,PL3,PR508,
PL507,PL509
Y
Check VTT power line
7/30
Y
+5V OK?
N
Check +12V power line
Change D/D Board
Y
+5V_P OK?
N
Check D/D board,
+5V_P power line
PU1,PL2,PQ501,
PR501,L508,PL510
Check +5V power line
8. VCC_CORE problem
VCC_CORE problem
VCC_CORE
1.6V
Y
(or 1.35V)
just after P_ON
N
Y
PU2 2pin is
always low?
N
Y
VCC_CORE-GND
Shortage?
N
Check
PU504,PU503,PU506,
PU507PR14,PL503,
PR22,PL3,PR24,PR23
PU501,PD3
6/30
Check
PR23,PR24,D14,R84
Check U16,D14,R84
Check
PU507,PU506,PU504,PU503,
PR24,PR23,C516,PC20,
PC517,PC522,PC520,PC521
and VCC_CORE power line
8/30
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