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Trouble shooting
Panel Control Circuit
Check CN800 pin 2－6
is 5V and signal on pin 9，10，
12，13，15，16，18，19，21，
22
Check U800 Output to
CN800 relative circuit
and CN800 VCC at
Q300, Q301, L803 (5V)
Check U300 crystal
X300 (12MHZ)
Check 2.5V L706-L710
No Display
NG
NG
NG
3.3V L704-L705
NG
Replace U300
OK
OK
OK
OK
36
Replace panel or FPC
cable to panel
Replace L803, C807
Replace X300
Replace components if it
has problem
Chapter 6
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