
X458 L3 Service Manual
25
Key light can’t work
Reassemble FPC
Use external power (2.8V) to
check LED can work or not
Changed or re-solder CPU MT6260
Key light can’t work
Use multimeter to check
voltage of LED is OK or not
Problem solve
Expect bar model
Check if circuit is
broken
Change LED
Upgrade software
软件升级
Problem solve
YES
YES
NO
NO
YES
NO
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Summary of Contents for X458
Page 13: ...X458 L3 Service Manual 13 All manuals and user guides at all guides com ...
Page 14: ...X458 L3 Service Manual 14 Output of SIM Card All manuals and user guides at all guides com ...
Page 17: ...X458 L3 Service Manual 17 Display interface All manuals and user guides at all guides com ...
Page 48: ...X458 L3 Service Manual 48 All manuals and user guides at all guides com ...