20.1.1. Firmware and Key Download
20 Basic Troubleshooting Guide
20.1. Basic Troubleshooting Guide for DVD Module
e) Check SDRAM addresand data bus, CLK and IC8051
other control signals waveform
c) Check reset signal and power voltage rise time IC8601
d) Check Flash ROM address and data bus IC8651
1) Firmware downloading
fails
a) Check supply voltages on ICs pins IC8111, IC8651, IC8001, IC8051, IC8151
2) CPPM/CPRM key
download fails
b) Check Oscillation frequency and level X8621 , C8621 , C8622 , R8621 , R8622
Problems Checking Points Checking components
f) Check EEPROM CLK & data line IC8611
*Compare the above with OK condition
Module
*Check for solder short and/or
component missing/damaged
91
SA-HT640WP / SA-HT640WPC
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