Power Supplies - Mitsubishi WD-52627 Training Manual

Block Diagrams & Signal Path

Power Supplies

Although the LCD Light Engine models (V28 chassis)
and DLP Light Engine models (V29, V30, V30+,V31)
are different, a large part of the circuitry is the same or
very similar in all chassis types.
The material in this chapter covers differences in cir-
cuitry between the LCD and DLP chassis. Since
troubleshooting will be mainly to board level, the Power
Supplies, Signal Path and Control circuitry connections
and paths between the various PWBs is also described.
The simplified Block Diagrams should help in isolating
problems to a specific PWB.
Chapter 5
Figure 5-1: Basic Power Supply Block Diagram
Power Supply Basic Description
Figure 5-1 shows the Basic Power Supply that is the
basis for all the chassis types. The Main Power Supply
is on PWB-POWER. The main Standby, Switched and
Ballast DC supplies are generated on the PWB-
POWER. It is also the source for the Fan Power Sup-
plies located on the PWB-INTERFACE.
On the DLP chassis, a PWB-ENG-PWR board is
added. This board generates the DC supplies required
by the DLP Engine.
In the V30+ and V31 chassis models, a Hard Disc Drive
(HDD) has been added. The additional Power Supply
5-1