Elo TouchSystems ET1587C - 4. The CS signal from monitor is not working properly

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3. The data message could not be stored by E2 PROM
Power supply circuit fail
No
Check
Pin 7,8
(U101) =5V
Check
the pin 5 , 6 from
U101 is connected
correspondly to pin
11, 12 from
U101
Check the
soldeling
Change
E2PROM
Yes
Yes
Check the circuit
No
Operate the CPU repeatly
Check
if the data can be
saved?
END
END
Change the CPU
Operate the CPU
Repeatly
Check
if the data can be
saved?
No
Yes
No
END
Find the software
engineer
Yes