DOWNLOAD LG 32LT75 / 32LT76 (CHASSIS:LD74A) Service Manual ↓ Size: 7.37 MB | Pages: 33 in PDF or view online for FREE

Model
32LT75 32LT76 (CHASSIS:LD74A)
Pages
33
Size
7.37 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
32lt75-32lt76-chassis-ld74a.pdf
Date

LG 32LT75 / 32LT76 (CHASSIS:LD74A) Service Manual ▷ View online

- 13 -
7.1. 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. Scart RGB(DVR) Adjustment Mode
* Required Equipments
- Remote controller for adjustment
- MSPG-925FS Pattern Generator
(Which has Video Signal : Color Bar Pattern shown in Fig.2)
-> Model : 232 / Pattern : 80
1) Input the Video Signal : Color Bar signal into AV1
(Using Full Scart Cable)
2) Set the PSM to Dynamic mode in Picture menu.
3) Press the IN-START key on R/C for adjustment
4) Press the TURBO-PICTURE key on R/C for adjustment
5) Press the 
G
(Vol.+) key operate To set , then it becomes
automatically.
6) Auto-RGB OK means adjustment is completed.
9. 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.
A u t o   C o l o r   B a l a n c e ( H e x )
   
A u t o- S c a r t R G B
T o   S e t 
R g a i n
1 6
G g a i n   1 6
B g a i n
1 4
Y G a i n
2 2
C b G a i n
2 2 
C r G a i n   1 A
R e s e t
T o S e t
S c a r t   R G B ( D V R )
N G
G
G
- 14 -
1. 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(F100) 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.
TROUBLESHOOTING
- 15 -
2. 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.
After connecting each connector do
they operate normally? 
No
Yes
Yes
Is the VSC
Board normal?
Is the output voltage normal after
removing P900, P901 of VSC Board?
If it operates normally after removing the
P900, P901 : Replace the VSC Board
No
Yes
Does minute
discharge at Module?
Is the LVDC cable
normal?
Is the inverter on?
Check the LCD Module
Yes
No
YES
Yes
Reconnect the LVDS
cable in P1901
No
Is the IC700(FLI8548)
Output normal?
Replace the VSC.
No
Replace VSC board.
Is it ok?
YES
YES
No
Is the Low/High output voltage
normal except for stand-by 5V?
No
Replace the Power
board
Is the voltage (P900 5pin
on VSC) 0V or Low?
No
3. No Raster
(1) Symptom
1) No OSD and image occur at screen. 
2) It maintains the condition where the front LED is green.
(2) Procedure check
- 16 -
4. In case of strange screen display in specific modes
4-1. In case of no OSD display
(1) Symptom
1) LED is green.
2) The minute discharge is continuously accomplished from the module.
(2) Procedure check
Is the LVDS cable
normal ?
Is the VSC Board
normal?
Is the LVDS cable
connected?
Insert the Cable.
Yes
No
No
Yes
Does the FIL8548
IC(IC700) operate?
Replace the FIL8548
IC(IC700)
No
Is the Ctrl Board of
Module normal?
Replace the Ctrl B/D.
No
No
Yes
Replace the VSC B/D.
Replace the cable.
Yes
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