(3) CPU (U10) trouble shooting guide :
Check +3Vs (pin92)
YES
Check X1 crystal
YES
RESET Successful?
YES
NO
NO
1.Check C75, C76
2.replace X1
check U18, make sure U18 pin1 has delayed for certain period of time ,from L go H.
1.Check U9(SRAM), check CPU_LCS_N (pin 58) and CPU_BHE_N is active?
2.Check U12(Flash), check R68 and CPU_UCS_N (pin
57)is active?
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