Model X771
L3 Service Manual
Solution
A-
There is no current when the Power Key is pressed; check J602 to see if there is false soldering,
pseudo soldering, if yes, Carry out Resoldering or replacement;
B-
When the Power Key is pressed, and the current stays within 10~15mA, if yes, Upgrade the
software version;
C-
There is current when the Power Key is pressed; the current changes to 0~5mA when the key is
loosened, if yes, The problem is caused by pseudo soldering or damage of 26M crustal(Y200);
carry out repair soldering or replacement of the crystal. Or, it is caused by pseudo soldering or
damage of CPU;
D-
There is heavy current when the Power Key is pressed, if yes, Find the hot point, and replace the
corresponding material CPU(U300) are damaged in most cases.
2)
Restart / Hang
Solution: Refer same to Power failure issue.
3)
LCD
Y200
U300
J602
