Acer X193 X183H / X193HQ Service Guide - Page 22

5. Troubleshooting (continued) 5.2 Nothing displays on the screen (Screen is black and colour of LED is blue)continued Continue ACER X193HQ 21 Go to cover page Check the 5V power supply for P305 pin 1,2,3. NG Check the I301 pin2 if voltage is 3.3V OK Check the I309 pin2 if voltage is 1.8V NG Proceed "Checking the DC/DC converter circuit" section. NG Proceed "Checking the DC/DC converter circuit" section. OK OK Check the I307 pin2 if voltage is 5V Failure Point NG 1) FB312 is open. 2) C353, C355 is short. OK Check if the voltage between I307 pin2 and pin3 is above -0.7V NG OK Failure Point I307 is failure. Check the input voltage level whether was changed when pressed function keys on the P304 pin 5 (normal is high level, when push buttom, generated 2.2V/1.9V/0.7V) NG Check if the Q311 pin2 of PANEL Power_ON/OFF signal that outputted by I305 NG pin10 is High level. OK Failure Point 1) Printed wire between R311 pin3, R410, R412, I307 pin1 is failure.. 2) Q311 is failure. Failure Point 1) Printer wire between R411 and I305 pin10 is failure 2) I305 is failure. 3) R413,C366 is short Check if the voltage on I305 pin 20 that is from 3.3V to 0.7V. OK Failure Point NG OK 1) Printed wire broke between P304 pin 5 and I305 pin 20. Check the P305 all LVDS signals. Failure Point I305 is failure NG OK Failure Point 1) Printed wire broke between P305 and I305 LVDS signals. 2) I305 is failure. Failure Point 1) The LVDS cable broke between P305 and LCD module. 2) LCD module is failure.