Zenith M52W56LCD, Service Manual

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ADJUSTMENT INSTRUCTIONS
1. Application Object
This instruction is for the application to the LCD projection
TV(MB-042B Chassis).
2. Notes
(1) Because this is not a hot chassis, it is not necessary to use an
isolation transformer. However, the use of isolation transformer
will help protect test equipment.
(2) Adjustments must be done in the correct order.
(3) The adjustments should be performed in the circumstance of
25
!
5°C of temperature and 65
!
10% of relative humidity if
there is no specific designation otherwise.
(4) The input voltage of the receiver must be kept 120V, 60Hz
while adjusting.
(5) The receiver must be operated for about 15 minutes prior to
adjustments.
The preliminary operation must be performed after receiving
100% white pattern, but reception of the moving picture may
also be possible in unavoidable case.
3. Composition of Adjustment Mode
(1) All adjustment modes are entered by pressing the ADJ key on
the Service Remote Control, after adjustment press the ADJ
key to exit.
(2) Composition of adjustment mode: The first screen composi-
tion of pressing ADJ key.
(Fig. 1) The First Screen of Adjustment Mode
(3) Select menu item to adjust(turn to yellow) by using (CH+(
D
),
CH-(
E
)) key and press the enter key to adjust the selected
item.
(4) After entering the SUB menu, select the SUB menu item by
using (CH+(
D
), CH-(
E
)) key and adjust the value by using
the (
F
), volume - (
G
) key.
(5) Press the ADJ key to exit after adjustment(s).
4. LCD Adjustment
4-1. NRS Adjustment
[
When the LCD panel load data on regular pixel using high
speed charge/discharge with sample & holder, the drain width
of TFT gradually decreases and the non-resistance increases,
and comes out regular noise on screen(shows vertical line by
12 pixel)
This NRS signal is enforced charge/discharge signal so that
the ON/OFF time of TFT mode quickly before starting active
video signal, H/L level adjustment is possible to each R, G, B.
(1) Required Test Equipment
1) PC Pattern Generator : 16 Step Gray Pattern
2) Fixation Stand
3) Service Remote Control
4) Circuit thing Jig for Adjustment(Except Driver Board Assy)
(2) Equipment Composition :
Follow Fig. 2
(3) Preparation for Adjustment
1) Connect PC Pattern Generator with Adjustment Jig like Fig. 2.
(Except Drive part of a circuit block)
2) Select a PC Pattern Generator, 16 Gray.
(4) Adjustment Sequence
1) Turn on Adjustment Jig.
2) Select a RGB_PC by pressing Input Select button on Remote
Control.
3) Enter to adjustment mode by pressing ADJ button on Remote
Control.
4) Select 1. M62352, to adjust RRefV1, GRevV1 and BRefV1.
5) Decrease vertical line Noise by using Volume buttons.
(Input a R, G, B input signal, then adjust it individually)
6) When finished, exit adjustment mode by pressing the ADJ but-
ton.
4-2. VCOM Adjustment
(1) Required Test Equipment
1) PC PATTERN GENERATOR : Pattern Generator which can
generate each R,G,B signal and can observe the FLICKER
best(ex: me Character Pattern).
2) (Fig. 2) Equipment composition
3) Remote Control
4) Circuit thing Jig for Adjustment(Except Driver Board Assy of
adjustment model)
EZ ADJUST
1. M62352
2. Position
3. AD9883A-set
4. GAMMA
5. Uniformity
6. CONTRAST
7. RGB Alignment
8. System Option
9. Lamp Replace