Acer AL1702 AL1702W Service Guide - Page 36

3. Panel Power Circuit Check CN601 PIN 23-24 should have response from 0V to 5V When we switch the power switch from on to off Check the PPWR panel power relative circuit Q601, Q602 In normal operation, when LED =green, R601 =5 V, NG If PPWR no-response when the power switch Turn on and turn off, replace the U401- RTD2120L OK Replace panel 4. Keypad Board OSD is unstable or not working NG Is Keypad board connecting normally? Connect Keypad Board OK Is Button Switch normally? OK Is Keypad board normally? OK Check main board NG Replace Button Switch NG Replace Keypad Board 36