4. TROUBLE SHOOTING
- 97 -
4. BB Trouble Shooting
4.8 Power ON Trouble
Power On sequence of U310 is :
PWR(END) key press -> PM_ON_SW_N go to low(D601),PM6650-2M KPDPWR_N pin(24) ->
PM6650-2M Power Up -> VREG_MSMC_1.25V(C430), VREG_MSME_1.8V(C431),
VREG_MSMP_2.7V(C425), VREG_MSMA_2.6V(C422), VREG_TCXO_2.85V(C416) power up and
system reset assert to MSM -> Phone booting and PS_HOLD(D400)
assert High to PMIC(PM6650-2M).
Start
Battery voltg. higher
than 3.28V?
Press PWR key
Keypad LED on?
D601 high to low
when key press?
Is clock ok?
R406 : 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
Summary of Contents for U310
Page 3: ... 4 ...
Page 20: ...3 TECHNICAL BRIEF 21 ...
Page 33: ...3 TECHNICAL BRIEF 34 Figure 3 5 10 1 Bluetooth system architecture ...
Page 47: ...3 TECHNICAL BRIEF 48 Figure PM6650 2M Functional Block Diagram ...
Page 72: ...4 TROUBLE SHOOTING 73 4 2 SIGNAL PATH WCDMA Tx PATH WCDMA Rx PATH ...
Page 76: ...4 TROUBLE SHOOTING 77 ...
Page 90: ...4 TROUBLE SHOOTING 91 ...
Page 110: ...4 TROUBLE SHOOTING 111 CN501 C537 C538 MSM6250A ...
Page 116: ...4 TROUBLE SHOOTING 117 C216 C217 for MIC serial capacitor MSM6250A ...
Page 119: ...4 TROUBLE SHOOTING 120 Q400 Q401 Q402 VBATT GND ...
Page 149: ... 150 8 pcb layout ...
Page 150: ... 151 8 pcb layout ...
Page 151: ... 152 8 pcb layout ...
Page 152: ... 153 8 pcb layout ...
Page 153: ... 154 ...
Page 160: ...9 Calibration RF Auto Test Program 161 9 3 1 Example for Calibration Click START U310 ...
Page 163: ... 164 ...
Page 187: ...Note ...
Page 188: ...Note ...