VK Quality Group GSM C/S
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Charging Trouble
Charging Trouble
Check U502.
END
START
Charging is
not working.
The battery
pack is well contact to
the phone.
The battery
voltage is between
3.4V~4.2V.
TA,CLA,
DTC voltages are
equal to 5.2V/
600mA.
Reassemble
battery pack.
Check
battery pack.
When Q501 3pin is High then
Q501 1,2,5,6pin is High?.
Replace Q501
Check one of
TA, CLA and DTC.
Re-download S/W.
When CHG_IN 5V then
Q501 3Pin is High?.
YES
NO
NO
NO
YES
YES
YES
YES
NO
NO
CASE 1
CASE 2
Re-mount J401.
J401 connector is
well soldered on the
PCB.
NO
YES
Summary of Contents for VK4500
Page 1: ...VK Quality Group GSM C S GSM GSM SERVICE MANUAL SERVICE MANUAL VK4500 VK4500 ...
Page 11: ...VK Quality Group GSM C S Appearance Appearance ...
Page 12: ...VK Quality Group GSM C S Icons Icons ...
Page 13: ...VK Quality Group GSM C S Icons Icons ...
Page 14: ...VK Quality Group GSM C S Icons Icons ...
Page 15: ...VK Quality Group GSM C S LCD Panel LCD Panel ...
Page 26: ...VK Quality Group GSM C S Battery Rear Case Battery Rear Case Disassembling Disassembling ...
Page 30: ...VK Quality Group GSM C S Main PCB Main PCB Disassembling Disassembling ...
Page 32: ...VK Quality Group GSM C S Lower Case Lower Case Ass Ass y y Disassembling Disassembling ...
Page 36: ...VK Quality Group GSM C S LCD LCD Ass Ass y y Disassembling Disassembling ...
Page 54: ...VK Quality Group GSM C S Battery Charger Block Battery Charger Block ...
Page 56: ...VK Quality Group GSM C S Main PCB Main PCB Top Top Bottom Bottom ...
Page 57: ...VK Quality Group GSM C S Module Area Module Area ...
Page 58: ...VK Quality Group GSM C S RF Area RF Area ...
Page 59: ...VK Quality Group GSM C S BASEBAND Area BASEBAND Area ...
Page 74: ...VK Quality Group GSM C S TX Power Trouble E TX Power Trouble E GSM GSM ...
Page 75: ...VK Quality Group GSM C S RX Sensitivity Trouble E RX Sensitivity Trouble E GSM GSM ...
Page 76: ...VK Quality Group GSM C S RX Sensitivity Trouble E RX Sensitivity Trouble E GSM GSM ...