Service Manual
Page 5
... CCFL Drive. LCD Monitor Description Emachine E19T5W The LCD monitor will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage. 19" LCD Color Monitor 2. The power board will contain a main board, a power board and two key boards which house the flat panel control logic, brightness control logic and DDC. ...
... CCFL Drive. LCD Monitor Description Emachine E19T5W The LCD monitor will provide AC to DC Inverter voltage to drive the backlight of panel and the main board chips each voltage. 19" LCD Color Monitor 2. The power board will contain a main board, a power board and two key boards which house the flat panel control logic, brightness control logic and DDC. ...
Service Manual
Page 32
19" LCD Color Monitor 8.2 Trouble Shooting 8.2.1 Main Board No power No power Emachine E19T5W Press power key and look if the picture is normal NG Please reinsert and make sure the AC of 100-240 is normal OK NG Measure U702 PIN2=3.3V D701 (-)=1.8V OK X401 oscillate waveforms are normal OK NG NG Replace U401 Reinsert or check the Adapter/Inverter section Check CN701 or replace U702, D701, D702, Q702 Replace X401 32
19" LCD Color Monitor 8.2 Trouble Shooting 8.2.1 Main Board No power No power Emachine E19T5W Press power key and look if the picture is normal NG Please reinsert and make sure the AC of 100-240 is normal OK NG Measure U702 PIN2=3.3V D701 (-)=1.8V OK X401 oscillate waveforms are normal OK NG NG Replace U401 Reinsert or check the Adapter/Inverter section Check CN701 or replace U702, D701, D702, Q702 Replace X401 32
Service Manual
Page 35
19" LCD Color Monitor 8.2.2 Power/Inverter Board (1) No power Check CN902 pin5, 6 = 12V NG Emachine E19T5W Check AC line volt 110V or 220V OK NG Check the voltage of C905 (+) OK NG Check AC input Check bridge rectified circuit and F901 circuit Check start voltage for the pin3 of IC901 NG OK Check R909, R910 and Change IC901 Check the auxiliary voltage is bigger than 10V and smaller than 20V OK NG 1) Check IC901 2) Check IC901 over current protect circuit Check IC901 pin8 PWM wave OK NG Check IC901 Check Q903, ZD902, ZD903, ZD904, IC902, IC903 and T901 35
19" LCD Color Monitor 8.2.2 Power/Inverter Board (1) No power Check CN902 pin5, 6 = 12V NG Emachine E19T5W Check AC line volt 110V or 220V OK NG Check the voltage of C905 (+) OK NG Check AC input Check bridge rectified circuit and F901 circuit Check start voltage for the pin3 of IC901 NG OK Check R909, R910 and Change IC901 Check the auxiliary voltage is bigger than 10V and smaller than 20V OK NG 1) Check IC901 2) Check IC901 over current protect circuit Check IC901 pin8 PWM wave OK NG Check IC901 Check Q903, ZD902, ZD903, ZD904, IC902, IC903 and T901 35