4. TROUBLE SHOOTING
- 95 -
4.8 Power ON Trouble
Power On sequence of U890 is :
PWR(END) key press -> PM_ON_SW_N go to low(D602),PM6650-2 KPDPWR_N pin(24) ->
PM6650-2 Power Up -> VREG_MSMC_1.375V(C436), VREG_MSME_1.8V(C437),
VREG_MSMP_2.7V(C426),
VREG_MSMA_2.6V(C424), VREG_TCXO_2.85V(C404) power up and system reset assert to MSM ->
Phone booting and PS_HOLD(D400) assert High to PMIC(PM6650-2).
Start
Battery voltg. higher
than 3.28V?
Press PWR key
Keypad LED on?
D602 high to low
when key press?
VREG_MSMC_1.375V,
VREG_MSMP_2.7V, VREG_MSME_1.8V
VREG_TCXO_2.85V,
VREG_MSMA_2.6V power up?
Is clock ok?
R413,C402 : 19.2M
X400 : 32.768Khz
Change the Main board
Change or charging the
Battery
Follow the LED trouble
shoot
Check the Diode
Change the Main board
Check the TXCO
NO
YES
YES
YES
YES
YES
NO
NO
NO
NO
Содержание U890
Страница 1: ...Date April 2006 Issue 1 0 Service Manual Model U890 U890c Service Manual U890 U890c ...
Страница 3: ... 4 ...
Страница 20: ...3 TECHNICAL BRIEF 21 ...
Страница 46: ...3 TECHNICAL BRIEF 47 Figure PM6650 2 Functional Block Diagram ...
Страница 70: ...4 TROUBLE SHOOTING 71 4 2 SIGNAL PATH ...
Страница 109: ...4 TROUBLE SHOOTING 110 CN600 50pin LCD connector CN901 C907 C911 FB901 FB902 ...
Страница 115: ...4 TROUBLE SHOOTING 116 C226 C227 for MIC serial capacitor ...
Страница 118: ...4 TROUBLE SHOOTING 119 Q400 Q401 Q402 VBATT GND ...
Страница 139: ...Table 2 1 1 RF Block Component 6 BLOCK DIAGRAM 140 ...
Страница 140: ...6 BLOCK DIAGRAM 141 6 2 Interface Diagram U890 Interface Diagram ...
Страница 142: ...6 BLOCK DIAGRAM 143 Top Side ...
Страница 143: ...6 BLOCK DIAGRAM 144 Bottom Side ...
Страница 152: ... 153 8 pcb layout ...
Страница 153: ... 154 8 pcb layout ...
Страница 154: ... 155 8 pcb layout ...
Страница 155: ... 156 8 pcb layout ...
Страница 156: ... 157 8 pcb layout ...
Страница 157: ... 158 8 pcb layout ...
Страница 163: ...9 CALIBRATION 164 9 3 HOT KIMCHI Example Choose_U890 ...
Страница 164: ...9 CALIBRATION 165 Click APPLY button Click START button ...
Страница 165: ...9 CALIBRATION 166 Click Run button to lunch RF AUTOTEST ...
Страница 167: ... 168 ...
Страница 191: ...Note ...
Страница 192: ...Note ...