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NO POWER
(POWER INDICATOR OFF)
1
CHECK J707
VOLTAGE
PIN5, PIN6 (5V)?
1
CHECK
U801 PIN 1& U803
PIN 3 VOLTAGE
(5V) ?
CHECK
Q803 PIN 3(3.3V) &
U803 PIN 4 (1.8V)?
CHECK KEY CONTROL
CONNECTOR ROUTINE
2 2
IS U201
PIN88
VOLTAGE REPEATED
AS PULSE
SHAPE ?
CHECK IIC LINE CONNECTION
(U501, U502)
Waveforms
1
J707-#5, 6 / U801-#1/U803-#3
TROUBLESHOOTING GUIDE
1. NO POWER
YES
YES
YES
YES
2
U201-#88
NO
NO
NO
NO
CHECK U201 VCC, XTAL, RESET
12
CHECK POWER
BOARD, AND FIND
OUT A SHORT POINT
AS OPENING
EACH POWER LINE
CHECK U801.
CHECK 5VR LINE
(OPEN CHECK)
NO PROBLEM
1
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