Philips LX7000SA - Troubleshooting; Power, Picture, and Audio Issues; Playback and System Responsiveness; Remote Control and Display Issues

8-1
SUPPLY & MAIN BOARDS
TABLE OF CONTENTS
Brief Introduction ............................................................. 8-1
Supply Board - Component layout .................................. 8-2
Supply Board - Circuit diagram ....................................... 8-3
Main Board - Circuit diagram........................................... 8-4
Main Board - Component layout ..................................... 8-5
Electrical parts list............................................................ 8-5
8-1
Brief introduction of the Supply & Main Boards
Supply Board
The purpose of the Supply Board is to provide the rectified voltages for the other modules used in LX7000SA or LX8000SA with
the exception of the Power Amplifier Module that has its own rectified supply circuitry onboard. The Supply Board provides outputs
+12V, +5V6, +5V and +3V3 supply voltages.
Main Board
The purpose of the Main Board is to provide a means of electrical connection between the mains supply and the transformer. The
electronic Low Power Standby (LPS) circuit is also on the Main Board.
a. Low Power Standby (LPS)
Standby Transformer (5905) provides the LPS supply to control the relay (1910), cutting of the mains supply to the transformer
during the ECO Power (standby) mode.
b. Voltage Selector (For /21 version)
The Voltage Selector (1911) and addition connector (1909) provide a means of switching to different mains supply voltages
with the use of a /21 version transformer.