Acer A221HQV Acer A221HQV LCD Monitor Service Guide - Page 38

36 ACER A211H/A221HQ Go to contents page 5. Troubleshooting (continued) 5.2.2 Nothing displays on the screen (Screen is black and colour of LED is blue)continued: Continue Check the 5V power are supplied on CN306 pin 1, 2, 3, (to NG the LCD panel module) Check if the Voltage on I303 pin S that is DC power at 5V. OK Failure Point NG (1) Printed wire broke between CN301 pin 9, 10,11 and I303 pin 2. (2) L301 is open. OK Check the CN306 all LVDS signals. Check if the MOS FET Gate level NG on I303 pin G, that Gate level is low. Check the PANEL VCC_EN signal of the Q301 pin 1 (with R309) at high level. OK Failure Point I303 is failure. Failure Point NG 1) Printed wire broke between CN306 and I310 LVDS signals. 2) I310 is failure. OK Failure Point 1) Printed wire broke between Q301 pin 1 and I310 pin 64. 2) R309 is open. 3) I310 is failure. NG OK Failure Point 1) The LVDS cable broke between CN306 and LCD panel module. 2) LCD panel module is failure. Failure Point 1) Printed wire broke between Q301 pin 3, R305, R307, C312 and I303 pin G. 2) Q301 is failure.