DOWNLOAD LG 22LS4D (CHASSIS:LD73B / NF036A) Service Manual ↓ Size: 7.8 MB | Pages: 27 in PDF or view online for FREE

Model
22LS4D (CHASSIS:LD73B NF036A)
Pages
27
Size
7.8 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
22ls4d-chassis-ld73b-nf036a.pdf
Date

LG 22LS4D (CHASSIS:LD73B / NF036A) Service Manual ▷ View online

7.2. Manual white Balance 
- One of R Gain / G Gain / B Gain should be kept on 80, and
others  are controlled lowering from 80 
1) Press ‘power on’ of the control R/C, set heat run to white by
pressing 
G
, and heat run over 15 minutes. (Set : RS-233
Host : PC, Baud Rate : 115200bps, Download : Cortez)
2) Zero Calibrate CA-210, and when controlling, stick the
sensor to the center of LCD module surface.
3) Double click In-start key on Controlling R/C and get in
‘white balance’.
4) Set test-pattern on and display inside pattern. Control is
carried out on three color temperature, COOL, MEDIUM,
WARM. (Control is carried out three times,)
5) When the R/G/B GAIN is 80 on OSD, it is the FULL
DYNAMIC Range of the Module. In order to control white
balance without the saturation of FULL DYNAMIC Range
and DATA, one of R Gain / G Gain / B Gain should be kept
on 80, and other two is controlled lowering from 80.
* Color Temperature: Cool, Medium, Warm
1) When R GAIN is set to 80
- Control G GAIN and B GAIN by lowering from 80.
2) When B GAIN is set to 80
- Control R GAIN and G GAIN by lowering from 80.
3) When G GAIN is set to 80
- Control R GAIN and B GAIN by lowering from 80.
One of R Gain / G Gain / B Gain should be kept on 80,
and adjust other two lower than 80.
(When R/G/B GAIN are all 80, it is the FULL DYNAMIC
Range of Module)
8. Set information(Serial No & Model name)
(1) Setting up like bottom figure (After setting white balance,
this is set)
1) Press ADJ Key in the Adjust remocon.
2) Select  “System Control 2” by using 
D
/
E
(CH+/-) key,
and press 
A
(ENTER).
3) Using Adjust remocon, RS-232 Host & Baud Rate &
Download value change (RS-232 Host:Gprobe, Baud
Rate:115200bps, Download:Cortez)
(2) Bar-code scanning
1) Push the menu button in DTV mode. 
Select the STATION -> Diagnostics -> To set
2) Check the Serial Number.
- 13 -
System Control2
System
4-SYS
Spread on
On
RS-232 Host
Gprobe
Baud rate
115200bps
Download
Cortez
AGC-L
0
140
Audio Delay
0
DVI EQ
2
EQ Gain
OFF
LD73B
Cortez
1.00
Sti 5100
1.00
UTT
40 Hr.
------------------------------------------
Tool Option1
197
Tool Option2
97
Area Option
0
OPTION1
14
OPTION2
2
OPTION3
3
OPTION4
192
System Control1
System Control2
System Control3
BlkLine Detector
Power-off History
Panel control
Fan control
XSTUDIO Control
- 14 -
TROUBLESHOOTING
1. Power Board 
1-1. The full flowchart for the voltage output
Start check
Manufacture’s model
passage
1. Check the Power Off
status.
Does the whole
screen appear?
Is it 
identical to when the
power is off?
No
Yes
No
Yes
Yes
Yes
Yes
2. Check the Interface
signal status.
Is the Interface 
signal operating?
Yes
3. Check the St-by 5V
signal circuit.
Does the 
low pressure output
appear?
Does the 
St-by 5V signal 
appear?
No
No
Yes
4. Check the 5V Monitor
signal circuit.
Does the 
5V Monitor signal 
appear?
No
7. Check the VSC Vs-ON
signal 
Does the 
high tension output
appear?
Does the 
VSC signal Vs-ON
appear?
No
No
Does the
high tension 
output voltage
occur?
When
removing  the Y B/D
Module input connector,
does output voltage
drop?
When the
Y, Z B/D Module
input connector, does Power
Board high tension 
output voltage drop?
No
No
No
9. Check the Power
Board Output high
tension circuit
Yes
10. Check the Z B/D
Module output circuit
Yes
When 
removing the Z B/D
Module input connector,
does output voltage
drop?
11. Check the Y B/D
Module output circuit
Yes
Yes
8. Check the Vs, Va
voltage output circuit.
Does the 
Vs, Va voltage output
appear?
No
Yes
Yes
5. Check the VSC RL-ON
signal.
Does the 
VSC signal RL-ON
appear?
No
6. Check the VSC low
pressure output
Does the 
VSC low pressure
output appear?
No
- 15 -
2. No Power
(1) Symptom
1) Does not  minute discharge at module. 
2) Non does not come into the front LED. 
(2) Procedure check
Is the power cord plugged in?
Plug in the power cord.
Yes
No
Is the Line Filter and Power
Board Cable connected?
Connect the Cable.
Yes
No
Is the appropriate Fuse(F101) on
the Power Board?
Replace the Fuse.
Yes
No
Is the Power Board and 13P of
VSC Board Cable connected?
Connect the Cable.
Yes
No
After removing the cables, connect them to the Power Board(except the
SC101 connection cable), and change the AC voltage marking to manual.
When ST-BY 5V does not operate, replace the Power Board.
- 16 -
3. Protect Mode
(1) Symptom
1) After lighting up once, it does not discharge 
minutely from module.
2) The rely falls.(there is an audible “click”) 
3) The color of the front LED turns from green to red.
(2) Procedure check
Is the Power Board
normal ?
Replace the Power Board.
Is the output Low/High voltage normal
except for Stand-by 5V?
Yes
No
No
Is the each connector
normal?
Replace the connector.
Replace the 
Y-Board.
After connecting each connector do
they operate normally? 
Yes
No
Yes
Is the Ctrl Board
normal?
Replace the 
X-Board.
Is the output voltage normal after
removing P1, 2, 4, 9, 10 connectors of
the Ctrl-B/D?
Yes
No
Yes
Is the Y-Board
normal?
Is the output voltage
normal after removing
P103 connector of 
Y-B/D?
Is the appropriate Fuse(FS101,FS102)
on the Y-B/D normal?(Replace if open)
Yes
No
Yes
Yes
Replace the 
Z-Board.
Is the Z-Board
normal?
Is the output voltage
normal after removing
P1 connector of
Z-B/D?
Is the appropriate Fuse (FS1, FS2) on
Z-B/D? (replace if open)
Yes
No
Yes
Is the X- Board
normal?
Is the output voltage normal after
removing P1, 2, 3, 4, 5 connectors of
the X-B/D?
If the output voltage is normal after removing
the P1, P2, P3 : Replace the right X-B/D
If the output voltage is normal after removing
the P4, P5 : Replace the left X-B/D
Yes
No
Yes
Is the 
VSC Board normal?
Is the output voltage normal after
removing P900, P901 of VSC Board?
After a COF crisis for each board, check the normal operation. For normal operation,
corresponding COF failure means the module should be relaced.
If it operates normally after removing the
P900, P901 : Replace the VSC Board
Yes
No
Is the COF of X, Y, Z
normal ?
No
Yes
Yes
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