Acer AL1716 AL1716W Service Guide - Page 18

4. Troubleshooting (continued) 4.4 Nothing display on screen (screen is black, color of LED is blue) ACER AL1716W 17 Go to cover page Is backlight lit? NG Proceed to 'Checking the backlight unit' section. OK Does computer output RGB video signals? Check the video cable for failure. Check the host for output signal with all black only. 1. Change pattern of video signal output on the host NG computer. 2. Reconnect the video cable. 3. Change the video cable. OK NG Check OSD menu to display on the screen when you press 'MENU' key. Check if the LCD module signal cable is connected between the Interface Board and LCD Module. OK NG The LVDS cable is disconnected. OK Proceed 'Abnormal screen detection' section OK Check the 1V8 power are supplied on I306 Check the 3V3 power supplied to I306 NG Check if the voltage on I309 pin8 that is power DC at 5V OK Failure Point: I306 is defected. NG I309 may be damaged. NG OK Check the 5V power is supplied on P306 pin28, pin29, pin3 to the LCD panel OK Check the P306 all LVDS signals OK Check if the voltage NG on I301 pin3 that is DC power at 5V OK Check if the TTL level on Q302 pin2 and TTL level is low OK Failure Point: Q302 is failure Failure Point: Check if the voltage on I306 NG pin1 that is power DC 3V3 NG Failure Point: 1. I301 is open. 2. Printed wire is broken between P306 pin28, pin29 and FB303. Failure Point: 1. Printed wire broke between OK I307 pin3 and I306 pin1 2. L336 is open Failure Point: I306 is failure NG Check the PANEL ENABLE signal of the rectangle input Q302 pin2 at TTL high level. NG Failure Point: Q302 is failure Failure Point: NG 1. The LVDS cable beoke between P306 and LCD module. 2. LCD module is failure. Failure Point: 1. Printed wire broke between P306 and I306 LVDS signals. 2. I306 is defected. OK Failure Point: 1. Printed wire broke between Q302 pin2, I306 pin127. 2. I303 is failure