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Q120 TV Maintenance Manual
2
Table of Contents
1. Circuit diagram instruction .................................................................................3
1.1 Main board explored view...........................................................................3
1.2 Detailed Description of Circuit Chart.........................................................4
1.3 RF circuit .....................................................................................................4
1.4 Base band circuit .........................................................................................5
1.5 Function circuit............................................................................................6
2
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Fault maintenance ..............................................................................................8
3 Trouble shooting and flow chart ...........................................................................9
3.1 Unable to power on the handset ..................................................................9
3.2 No ring tone ...............................................................................................10
3.3 LCD display fault ...................................................................................... 11
3.4 Charging fault............................................................................................12
3.5 Camera fault ..............................................................................................13
3.6 Fail to identify SIM card ...........................................................................14
3.7 MIC fault ...................................................................................................15
3.8 Keypad fault ..............................................................................................16
3.9 Receiver fault .............................................................................................17
3.10 Vibrate fault .............................................................................................18
3.11 FM fault....................................................................................................19
3.12 No signal...................................................................................................20
3.13 Failure to identify T-flash card................................................................21
3.14 Earphone fault .........................................................................................22
3.15 Unable to use USB ...................................................................................23
Summary of Contents for Q120 TV
Page 3: ...Q120 TV Maintenance Manual 3 1 Circuit diagram instruction 1 1 Main board explored view...
Page 6: ...Q120 TV Maintenance Manual 6 1 5 Function circuit FM circuit U802 FM receiving chip RDA5802E...
Page 7: ...Q120 TV Maintenance Manual 7 BT circuit U701 BT receiver chip MT6612CN L...
Page 10: ...Q120 TV Maintenance Manual 10 3 2 No ring tone...
Page 11: ...Q120 TV Maintenance Manual 11 3 3 LCD display fault...
Page 12: ...Q120 TV Maintenance Manual 12 3 4 Charging fault...
Page 14: ...Q120 TV Maintenance Manual 14 3 6 Fail to identify SIM card...
Page 15: ...Q120 TV Maintenance Manual 15 3 7 MIC fault...
Page 18: ...Q120 TV Maintenance Manual 18 3 10 Vibrate fault...
Page 19: ...Q120 TV Maintenance Manual 19 3 11 FM fault...
Page 23: ...Q120 TV Maintenance Manual 23 3 15 Unable to use USB END...