Acer AL502 AL502 Monitor Service Guide - Page 16
NO OSD display
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5. NO OSD display Check the input of pulse from I300 pin 5, 6. NG OK Failure point 1) Printed wire broke between I306 pin 5 and I303 pin 9. 2) Printed wire broke between I306 pin 6 and I303 pin 8. Proceed "Checking the resolution change IC movement" section. A LC502 Trouble Sh ooting Page 7