By NCK Team
L2 Repair Document
TCT
Mobile Limited
Rev.
ONE TOUCH 4005D Level 2 Repair Document
Page
1.2
24/29
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battery connector if broken;
3.Check the charge plug on B cover,
change it if necessary;
Switch on with
battery power
Can „t Switch on
1.Check voltage of the battery;
2.Check the battery contact, change the
battery connector if broken;
3.Check the power on key;
4.Check BTB connector socket pin
Main display
Missing line or column; no
display; bad or no LCD
backlight
Check Connection flex (FPC
cable),change it if necessary;
Replace display module if necessary;
Vibrator
The vibrator does not work
Check the contact on the PCBA (dirty or
oxidized), replace the vibrator if
necessary;
Network Problem
No emission or No reception Check the antenna contactor on the B
cover;
Check the contact on the PCBA (dirty or
oxidized);
TF card
No communication between
the phone and the TF card
Check the TF connector on the PCBA;
Camera
Camera doesn't work
Check camera module
Check also camera socket broken or
not
Audio
Bad or no emission (TX
audio from mobile);
Bad or no reception (RX
audio on mobile);
Hands-free problem;
Key beep and melody
problem
Check microphone, replace it if
necessary;
Check the contact on the PCBA (dirty or
oxidized)
Check loud speaker, replace it if
necessary;
Check the contact on the PCBA (dirty or
oxidized)
In case the Level
2 repair can‟t solve the problem, or the PCBA is damaged, exchange the PCBA.
7 PCBA exchange
If Level 2 repair does not solve the failure, it is mandatory to change the PCBA and follow the process as
below.
