Acer AL2023 AL2023W Service Guide - Page 44

Chapter 4 TROUBLE SHOOTING This chapter provides trouble shooting information for AL2023W 1. No Power No Power NO Change 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=24MHz Yes Check U5 Pin 42,43 Clock Yes Check U6 Pin 42,43 Clock NO Change U6 - 44 -