3. TROUBLE SHOOTING
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3.10 Power
START
Change the main board
Check PM8926’s SMPS voltage level?
Press PWR Key
R4105 signal change from high to low?
Battery voltage higher than 3.4V?
Is it normal voltage?
Is the X4100 signal normal?
Check it’s 19.2Mhz
Is the signal high at R4104, TP2106 ?
Phone doesn’t boot yet?
Change CN100
Change or charging the Battery
Change X4100
END
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes