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4 . TROUBLE SHOOTING
Checking Flow
START
Check Battery Voltage
> 3.35V ?
Push power-on key
And check the level change
of PWRKEY
Check the voltage of
The LDO outputs at U101
Logic level at KEYON of U101
= HIGH
Does it work properly?
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
THE PHONE WILL
POWER ON.
Replace the main board
The power-on procedure is
Completed. The problem may
be elsewhere.
Does it work properly?
VCORE=1.8V
VMEM=2.8V
VEXT=2.8V
VABB=2.75V
WCXO=2.75V
VRTC=1.8V
VSIM=2.5V (when sim card is inserted)
VMIC=2.5V
Re-download software
Replace U101
Check the contact of power key
Or dome-switch
Charge or Change Battery
Содержание B2070
Страница 54: ... 53 4 TROUBLE SHOOTING 4 2 TX Trouble TEST POINT 13Mhz OSCILLATOR Mobile SW FEM TRANCEIVER LDO PAM ...
Страница 68: ... 67 4 TROUBLE SHOOTING TEST POINT 4 6 LCD Trouble ...
Страница 72: ... 71 4 TROUBLE SHOOTING TEST POINT 4 8 Speaker Trouble ...
Страница 79: ... 78 4 TROUBLE SHOOTING 4 11 KEY backlight Trouble TEST POINT ...
Страница 96: ...6 Press Start and Pover on the phone using JIG remote Power on Switch 1 5 DOWNLOAD AND CALIBRATION 95 ...
Страница 107: ... 106 8 PCB LAYOUT Figure 8 1 B2070 BOTTOM SIDE PCB LAYOUT ...
Страница 108: ... 107 8 PCB LAYOUT Figure 8 1 B2070 TOP SIDE PCB LAYOUT ...
Страница 109: ... 108 ...
Страница 117: ...10 STAND ALONE TEST 116 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Страница 121: ... 120 ...
Страница 123: ... 122 ...