Alignments
EN 26
LGE PDP
8.
8.
Alignments
Index of this chapter:
8.1 General
8.2 Alignment PDP42V7*
8.1
General
Notes:
1.
Allow the set to warm up according conditions below for at
least 10 minutes before adjusting.
–
Service signal: 100% Full White.
–
Service DC voltage: Vcc= 5 V, Va= 65 V, Vs= 187 V.
–
DC/DC Pack voltage: Vsc= 115 V, -Vy= -85V
–
Preliminaries environment: Temp (25
±
5 deg. C),
Relative Humidity (65
±
10%).
2.
Module adjustment should follow below sequence.
–
First, set up the Vsc / -Vy voltage (Vsc= 115 V, -Vy= -
85 V).
–
Then, adjust the voltage waveform (refer to
adjustment).
Caution: Do not leave a still image for more than 10 minutes
(especially The Digital pattern or Cross Hatch Pattern which
has clear gradation) on the display, because this will cause
burn-in effects.
8.2
Alignment PDP42V7*
8.2.1
Connection Diagram and Set-Up
1.
For the connection diagram of the measuring instrument,
refer to Fig. "Measuring equipment connection diagram".
2.
Set-up the initial voltage (voltage label) Vcc= 5 V, Va= 65
V, Vs= 187 V. Note that the initial set-up voltage can be
changed according to the module’s characteristic.
Figure 8-1 Measuring equipment connection diagram
8.2.2
Tools
1.
Digital oscilloscope: > 200 MHz.
2.
DVM (Digital Multimeter): Fluke 87 or similar.
3.
Signal generator: VG-825 or similar.
4.
DC power supply or PSU:
–
DC power supply for Vs (1): 0 - 200 V, > 10 A.
–
DC power supply for Va (1): 0 - 100 V, > 5 A.
–
DC power supply for 5V (1): 0 - 10 V, > 10 A.
–
DC/DC converter jig (1): The jig with an equivalent
voltage output of PDP42V7#### module after taking
the Vs, Va, and 5V voltage.
–
Voltage stability of power supply: Within
±
1% for Vs
and Va, within
±
3% for 5V.
8.2.3
Alignments
Figure 8-2 Y, Z set-up waveform
Vset-up Alignment
Adjusting Vset-up voltage wave form:
1.
Connect the measuring instruments according to Fig.
"Measuring equipment connection diagram".
2.
Turn on the measuring instruments with “Caution” of Fig.
"Measuring equipment connection diagram".
3.
Connect the oscilloscope probe to B39 (Bead) of Y board
bottom and GND.
4.
Turn the VR1 on the Y board, and make the “A” waveform
according to Fig. " Y, Z set-up waveform " to be 10
±
2
µ
s.
Vset-down Alignment
Adjusting Vset-down voltage wave form:
1.
Turn the VR2 on the YSUS board and make the “B”
waveform according to Fig. " Y, Z set-up waveform " to be
100
±
2
µ
s.
DC/DC Pack Voltage Alignment
Checking the DC/DC Pack voltage:
1.
Convert the signal of the signal generator to a 100% Full
White signal.
2.
Connect the GND terminal of the DVM to the right leg of
R53 on the Y board, and set the Plus terminal to the left leg
of R53 to check the Vsc voltage (115
±
1 V) and when there
is abnormality in the voltage, turn the variable resistor
(VR3) of DC/DC Pack (Vsc) PS1 on the Y board to adjust.
3.
Connect the GND terminal of the DVM to the right leg of
R78 on the Y board and set the Plus terminal to the left leg
of R78 to check the -Vy voltage (-85
±
1 V) and when there
is abnormality in voltage turn the variable resistor (VR4) of
the DC/DC Pack (-Vy) PS1 on the Y board to adjust.
E/X Tube
X right
CONTROLLER
Signal Input
(R,G,B,H/Vsync.)
X left
Z – SUS
Y-SUS
187
1.0
DC Power Supply for Vs
65 0.02
DC Power Supply for Va
5
1.0
DC Power Supply for 5V
Signal Generator(VG-825)
Power
Caution
(1) The power of the signal generator should be turned on before turning “on”
the power of the DC power supply.
(2) The voltage of DC power supply , in standard of Module input voltage,
should be preset as below.
Vcc: 5V, Va: 65V, Vs: 187V
(3) The power of power supply must turned “on” by this sequence.
Reverse direction when turning “off”.
* Module “on” : 5V => Va => Vs, Module “off”: Vs => Va => 5V
(4) Signal generator should be selected with 852x480(WVGA) mode.
Also the PSU(Power Supply Unit) use is possible
F_15590_004.eps
060705
Vs
Vset_up (=Vs) = 187 ± 1V
- Vy = - 85 + 1V (Vr4)
Vs = 187 ± 1V (on PSU)
Z board waveform
B: Vset_down= 100 + 2 µs (Vr2)
A:10 + 2 µs
(Vr1)
F_15590_003.eps
040705
