LG KE800 Service Manual page 31

4. Trouble Shooting
Check "END_KEY" Signal
Check "PWRON" Signal
Check "RESET" Signal
START
Connect power
supply to the DUT
Vbat = over 3.35V
Press "End" Key
➀
Voltage level at
R627 goes to high?
Yes
➁
"PWRON" signal
at R202 goes to high?
Yes
➂
"RESET" signal
at R115 goes to high?
Yes
Is the 26MHz
clock at C521
signal correct?
Yes
Replace main PCB
- 32 -
No
Check solder
Side-Key or replace it
No
1)Check MAIN FPCB is
connected properly.
2)Replace U201
No
1)Check current consumption
2)Try to re-download S/W
No
Check solder
X501 or replace it