37’’ LCD TV Color Monitor Norcent LT3725
22
5. Repair Flow Chart
5.1 Abnormal display
CHECK CON901 PIN9
=
12V
CON905 PIN3=5V?
Check POWER BOARD
NG
OK
CHECK CN407 PANEL connect is
normal?
Reconnect CN407
NG
CHECK X401
、
X701 is normal?
Check surge circuit
CHECK U108 PIN18, PIN17, PIN14 output wave is OK;
PIN9 PIN20 power supply is OK?
CHECK U401 PIN R5
、
PIN T8=3.3V?
U401 PIN E6=2.5V? PIN R9=1.8V?
CHECK SCALER power
Check Tuner circuit
Check TV mode display is normal?
CHECK I²C1DATA, CLK is normal?
CHECK SCALER HS VS is normal?
OK
OK
OK
OK
OK
OK
NG
NG
OK
OK
Summary of Contents for Norcent LT3725
Page 4: ...37 LCD TV Color Monitor Norcent LT3725 4 1 General Specifications ...
Page 6: ...37 LCD TV Color Monitor Norcent LT3725 6 2 2 Front Panel Control Knobs ...
Page 7: ...37 LCD TV Color Monitor Norcent LT3725 7 2 3 OSD Operations ...
Page 8: ...37 LCD TV Color Monitor Norcent LT3725 8 ...
Page 9: ...37 LCD TV Color Monitor Norcent LT3725 9 ...
Page 10: ...37 LCD TV Color Monitor Norcent LT3725 10 ...
Page 11: ...37 LCD TV Color Monitor Norcent LT3725 11 ...
Page 12: ...37 LCD TV Color Monitor Norcent LT3725 12 ...
Page 13: ...37 LCD TV Color Monitor Norcent LT3725 13 ...
Page 14: ...37 LCD TV Color Monitor Norcent LT3725 14 2 4 How to Connect ...
Page 15: ...37 LCD TV Color Monitor Norcent LT3725 15 ...
Page 19: ...37 LCD TV Color Monitor Norcent LT3725 19 Remove the boards Remove the screws Remarked in red ...
Page 20: ...37 LCD TV Color Monitor Norcent LT3725 20 Remove main frame Remove the screws remarked in red ...
Page 21: ...37 LCD TV Color Monitor Norcent LT3725 21 Remove the bezel Remove the screws remarked in red ...
Page 26: ...37 LCD TV Color Monitor Norcent LT3725 26 7 PCB Layout 7 1 Main Board ...
Page 27: ...37 LCD TV Color Monitor Norcent LT3725 27 ...
Page 28: ...37 LCD TV Color Monitor Norcent LT3725 28 7 2 Power Board ...
Page 29: ...37 LCD TV Color Monitor Norcent LT3725 29 7 3 Key Board ...
Page 30: ...37 LCD TV Color Monitor Norcent LT3725 30 8 Block Diagram 8 1 Main board ...
Page 53: ......
Page 54: ...37 LCD TV Color Monitor Norcent LT3725 54 10 Exploded View ...