Light Engine Replacemant - Toshiba 52HMX84 Service Manual

Cautions when replacing LIGHT ENGINE
LIGHT ENGINE is a heart of TV which emits high heat.
Make sure to replace it after turning off the TV and wait
for sufficient cool down. (More than one hour is recom-
mended.)
Do not add any impact during replacement; otherwise,
some parts may be damaged.
Do not touch any optical lens. Adhesion of dirt may
deteriorate its performance.
Do not loosen any screw other than those to be removed
for adjustment or replacement.
LIGHT ENGINE emits ultraviolet rays when the TV is
ON. Make sure to be careful.
1. Replacement of Light Engine Unit
1-1. When Light Engine Unit is replaced with a new one, the
adjustment is required. Adjusted values are described
in bar code, and the values of bar code must be con-
ver ted to the adjusted values for the setup.
There are 2 types of bar code.
Serial bar code
Serial bar code
Ex. 52A000A111111
Inch size
Data bar code (CW: color wheel)
Ex. A111111B1111
Substrate serial numbers
LIGHT ENGINE REPLACEMENT
Data bar code
Serial numbers
CWdelay number: 4digits
DMD bias value
1-2. Adjustment is made by service mode. The adjusting
items consist of CWDL, CWDH and DMDB.
CWDL CWDH
When CW delay number of the data bar code is 0450:
0450 indicates
Double 45.0 to form hexadecimal number (HEX).
45.0 x 2=90
The adjusted value becomes "5A" for CWDL and "00"
for CWDH.
If hexadecimal number forms 3 or 4 digits, the latter 2
digits indicate CWDL while the first 2 digits indicate
CWDH.
(For 3 digits, CWDH=0*)
Note:
For converting decimal number to hexadecimal num-
ber, see the conversion table on the next page.
DMDB
Read DMD bias value described in alphabet from the
data bar code. In service mode, DMDB value is con-
verted and fixed by the following table.
DMD value in bar
code
B
C
D
E
F
Refer to Service Mode for adjusting the service mode.
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450 45.0
5A (hexadecimal)
Adjusted value
(Hex)
00
01
02
03
04