Pcb And Component Descriptions; G-Board Power Supply); Lamp Power Supply Block (Aka Ballast, Lamp Driver); A1-Board (Audio/Video Switching, System Control, & Audio Processing) - Sony KDS-50A2000 Training Manual

PCB and Component Descriptions

Reference Figure 2-4

G-Board Power Supply)

Except some regulator circuits on various boards, the G-Board is the
power supply system board, which includes the following components
and circuits.
• Standby 5V Power Supply
o 5V
• Main Power Supply
o 11V
o 14V
o 16.5V
o 6.5V
o
Switched 9V
o 380V
• Power Factor Circuit (PFC)
• Main AC Relay
• Inrush Current Relay

Lamp Power Supply Block (aka Ballast, Lamp Driver)

The 380V volts developed in the Main Power Supply on the G-Board powers
the Lamp Power Supply Block. The Lamp Power develops approximately
12K voltages to initial ignite the High Voltage Mercury Vapor Arc Lamp.
After the initial high voltage the Lamp Power Supply Block regulates the
lamp voltage down to approximately 60V during normal operation. The
lamp voltage must be strictly regulated to keep the current in the Lamp
from running away and destroying the lamp.
TVP-23
2. PCB & Component Locations and Descriptions
A1-Board (Audio/Video Switching, System Control, &
Audio Processing)
The ASU-Board performs all the analog video and audio switching
functions. The following video and audio inputs are switched on this
board.
Video:
• Video Inputs 1, 2, 3 (Composite & S-Video-Video 1 Only)
• Video Inputs 4, 5 (Component)
• NTSC Tuner Signal
• PC Input
The following video inputs go directly to the B1-Board
• Video 6, 7 (HDMI/DVI)
• ATSC Tuner Signal
Audio:
All audio inputs are switched on the A1-Board. However, there are two
audio switcher ICs (IC9602 & IC9400)
Audio Input Switched by IC9602
• Video Inputs 1, 2, 3 (Composite)
• Video Inputs 4, 5 (Component)
• NTSC Tuner Signal
• PC Input
Audio Input Switched by IC9400
• Video 6, 7 (HDMI/DVI)
• ATSC Tuner Signal
The following circuits are also located on the A1-Board.
• DE Microprocessor
• Fan Driver Circuits
• Audio Processor
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