Acer A221HQV Acer A221HQV LCD Monitor Service Guide - Page 50

48 ACER A211H/A221HQ Go to contents page 5. Troubleshooting (continued) 5.3.2 Nothing displays on the screen (Screen is black and colour of LED is blue)continued: Continue Check the 5V power are supplied on CN304 pin 1, 2, 3, 4, 5 NG (to the LCD panel module) Check if the Voltage on I302 pin S that is DC power at 5V. OK Failure Point NG Printed wire broke between CN301 pin 9, 10,11 and I301 pin S. Check if the MOS FET Gate level NG on I302 pin G, that Gate level is low. Check the PANEL VCC_EN signal of the Q303 pin 1 (with R309) at high level. OK OK OK Failure Point I302 is failure. Failure Point 1) Printed wire broke between Q303 pin 1 and I306 pin 29. 2) I306 is failure. NG Failure Point Check the CN304 all LVDS signals. NG 1) Printed wire broke between CN304 and I306 LVDS signals. 2) I306 is failure. OK Failure Point 1) The LVDS cable broke between CN304 and LCD panel module. 2) LCD panel module is failure. Failure Point 1) Printed wire broke between Q303 pin 3, R305, R307, C309 and I302 pin G. 2) Q303 is failure.