FLY FS501, Руководство по обслуживанию, Страница: 28 / 29

FLY SERVICE SUPPORT
2, Touch Panel function NG, at present is mainly due to FPC itself partial long cause, the I2C
initialization failed;
TP circuit
3.2.10 Cannot boot failure
Can't boot failure is the phone fault with highest probability of occurrence. Software
problems, welding problem, device failure is the main factor causing failing to boot.
Maintenance process can cooperate with LCD and startup current, as well as the keyboard and so
on to orientate approximately.
1, Power off leak current is large. The main failure reason is VBAT connected components had
gnd short circuit problem. Usually radio frequency PA burned or welding problem cause. The
simpler method is looking for is a hot devices, general such devices have larger power on short
circuit.
2, Boot without current, LCD no display, keyboard, etc not bright
1) boot key SMT bad
2) battery connector bad contact (through the plug charging machines)
3, Crashed when boot