1、POWER
Check if the 12V at pin 1 of CNB2
output normal
Check whether the power board output normally?
N
N
Check whether UD11 output is 5V?
Check whether UD5 output is 1.8 V?
Check whether UD4output is 3.3 V?
Check whether UD2 output 1.15 V?
fix the power
supply
Check whether the main IC is damaged
Y
Y
Check whether the UD11 is damaged?
Check whether the UD5 is damaged?
Check whether the UD4 is damaged?
Check whether the UD2 is damaged?
N
Maintenance UD11,UD5,UD2,UD4
Check the 12V power supply to the UD11
circuit are in good condition
Y
N