(l193sab-al**t) l173sa (l173sab-al**a) l173st ... - MobRepair.ru
(l193sab-al**t) l173sa (l173sab-al**a) l173st ... - MobRepair.ru
(l193sab-al**t) l173sa (l173sab-al**a) l173st ... - MobRepair.ru
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1<br />
1<br />
2<br />
3<br />
Waveforms<br />
NO POWER<br />
(POWER INDICATOR OFF)<br />
CHECK J103 VOLTAGE<br />
PIN5, PIN6 (5V)?<br />
YES<br />
CHECK<br />
U501 PIN 8 Voltage<br />
(5V) ?<br />
YES<br />
CHECK KEY CONTROL<br />
CONNECTOR ROUTINE<br />
YES<br />
IS U401<br />
PIN55 (3.3V)<br />
VOLTAGE ?<br />
YES<br />
CHECK U401 PIN 171<br />
PULSE<br />
YES<br />
CHECK U401<br />
TROUBLESHOOTING GUIDE<br />
1. NO POWER<br />
:[A]PROCESS<br />
1 J103-#5, 6 / U501-#8 2 U401-#55 3 U401-#177<br />
NO<br />
NO<br />
NO<br />
NO<br />
- 14 -<br />
CHECK LIPS, AND FIND OUT A<br />
SHORT POINT<br />
AS OPENING<br />
EACH POWER LINE<br />
CHECK 5VS LINE<br />
(OPEN CHECK)<br />
CHECK 3.3V LINE<br />
CHECK X-TAL(X501)<br />
NO PROBLEM
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