LG KG200 Service Manual - Page 29

Power on/off Problem

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4. Troubleshooting Power on/off Problem Start NO Re-Download SW YES NO YES Check the voltage of the following pins at U400 VCORE_C407=1.8V? VDD_C408=2. AVDD_C409=2.8V? VMEM_C411=2.7V? VBAT_C405= 3.8V? YES NO NO Check the X100=32.768KHZ YES NO Check the U603_C642=26MHZ YES Power will work properly Go to step 2 Replace the U400 Replace the U400 Change X100 Change U603 - 30 -

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4. Troubleshooting
- 30 -
Power on/off Problem
Start
Replace the U400
Re-Download SW
Go to step 2
Check the voltage of the following pins at U400
VCORE_C407=1.8V?
VDD_C408=2.
AVDD_C409=2.8V?
VMEM_C411=2.7V?
VBAT_C405= 3.8V?
Power will work properly
YES
YES
YES
NO
NO
NO
Check the X100=32.768KHZ
Change X100
Check the U603_C642=26MHZ
Change U603
Replace the U400
NO
NO
YES
YES