Norcent Norcent LT2725, Service Manual, Page: 22 / 123

27’’ LCD TV Color Monitor Norcent LT2725
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