Acer AL2223WD AL2223WD Service Guide - Page 42

Chapter 4 TROUBLE SHOOTING This chapter provides trouble shooting information forAL1932 Trouble Shooting 1. No Power No Power Change NO Power Board No Check Short Of Main Board NO Change Q3,D1,U1,D2 NO Change X1 NO Change U5 or U4 Change U5 RUN Software ISP Check Bottom Board Check CN1 +12V and +5V Yes Check D1=1.8V U1 out=3.3V Yes Check X1=14.318MHz Yes Check U5 Pin 42,43 Clock Yes Check U6 Pin 42,43 Clock - 42 - NO Change U6