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Test flowchart of no display or display abnormally.
Clean and re-solder
J601
Check if there is start signal from
pin 13 of J601 and if 8 bit
address bus is normal or not
No display or
display abnormal
when power on
Replace LCD
NO
NO
NO
OK
YES
YES
If display interface
connects OK
Replace LCD/FPC
End
Replace or resolder U101
Check LCD broken or
not or leak
NO
YES
Update to the latest
software
Summary of Contents for EM941
Page 6: ...6 Paste the film on lens and LCD Take PCBA out of A cover Take off the main key...
Page 8: ...8 FINISH Lock the screws Assemble battery cover...
Page 9: ...9 Chapter 2 SYSTEM BLOCK DIAGRAM...
Page 10: ...10 Chapter4 ACTUALL BOARD PCBA layout drawing A side J701 LCD connector...
Page 11: ...11 Electronic schemes Main CPU...
Page 12: ...12 Keypad input...
Page 13: ...13 Oclock Electronic schemes Cable and flash connect sheet Oclock out put...
Page 14: ...14 BT control SIM card data out put 7 2 MT6235 CPU power output...
Page 16: ...16 BT MODEL...
Page 17: ...17 Audio PA U201 I O connector 5PIN...
Page 18: ...18 PA IC RF AD6548 RF7166...
Page 19: ...19 FM SIM card SIM 1 SIM 1power supplier SIM 1 data SIM 2 power supplier SIM 2...
Page 20: ...20 8 0 WIFI 2 Control loop...
Page 39: ...39 Figure 18 Figure 19...
Page 40: ...40 Figure 20...