DOWNLOAD LG 42LF20FR (CHASSIS:LP91A) Service Manual ↓ Size: 7.76 MB | Pages: 28 in PDF or view online for FREE

Model
42LF20FR (CHASSIS:LP91A)
Pages
28
Size
7.76 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lf20fr-chassis-lp91a.pdf
Date

LG 42LF20FR (CHASSIS:LP91A) Service Manual ▷ View online

* CASE
First adjust the coordinate far away from the target value(x, y).
1. x, y > target
i) Decrease the R, G. 
2. x, y < target
i) First decrease the B gain, 
ii) Decrease the one of the others.
3. x > target, y < target
i) First decrease B, so make y a little more than the target.
ii) Adjust x value by decreasing the R
4. x < target, y > target
i) First decrease B, so make x a little more than the target.
ii) Adjust x value by decreasing the G
(4) Standard color coordinate and temperature when using the
CA100+ or CA210 equipment
To check the Coordinates of White Balance, you have to
measure at the below conditions.
Picture Mode : User 1
Dynamic Contrast : Off
Dynamic Colour : Off
(If you miss the upper condition, the coordinates of W/B
can be lower than the spec.)
- 13 -
Coordinate 
Mode 
x y 
Temp uv∆
Cool
0.276±0.002 0.283±0.002
11,000K
0.000
Medium
0.285±0.002 0.293±0.002
9,300K
0.000
Warm
0.313±0.002 0.329±0.002
6,500K
0.003
- 14 -
TROUBLESHOOTING
No power
(LED indicator off)
Check 24V, 12V, 5,2V 
of Power B/D
Check short of Main B/D 
or Change Power B/D
Pass
Check Output of 
IC1001, IC1003, IC1007
Check P307 Connector 
Change LED 
Assy
:  
[A] PROCESS
Fail
Fail
Pass
Pass
Check LED Assy
Change IC1002,, Q1003
Pass
Check short of IC1001,
IC1003, IC1007
Fail
Re-soldering or Change defect
part of IC1001, IC1003, IC1007
Fail
No Raster
[B]: Process
Check LED status
On Display Unit
Repeat A PROCESS
Pass
Fail
Check Output of IC802
Change IC802
Fail
Change Inverter Connector
Or Inverter
Fail
Pass
Fail
Pass
Change Module
Fail
Check LVDS Cable
Pass
Check Panel Link Cable 
Or Module
Change Panel Link Cable
Or Module
Check Inverter Connector
Or Inverter
Pass
- 15 -
No Raster on PC Signal
Check Input source Cable
and Jack
Pass
Re-soldering or 
Change the defect part
Pass
Check the Input/Output
Of IC100
Fail
Re-soldering or 
Change the defect part,
Check RGB EDID Data
Repeat [A], & [B] Process
Pass
Check the Input/Output
Of J104
Fail
Pass
Check the Input/Output
Of IC800
Fail
Re-soldering or 
Change the defect part
Pass
No Raster on COMMPONENT Signal
Check Input source 
Cable And Jack
Pass
Re-soldering or 
Change the defect part
Pass
Check the Input/Output
Of IC800
Fail
Re-soldering or 
Change the defect part
Repeat [A], & [B] Process
Check The Input/Output
Of JK101
Fail
Pass
No Raster on HDMI Signal
Check Input source 
Cable And Jack
Pass
Check the Input/Output
Of JK301, JK302, JK303
Fail
Re-soldering or 
Change the defect part
Pass
Pass
Check the Input/Output
Of IC300, IC301, JK302
Fail
Re-soldering or 
Change the defect part
Check HDMI EDID Data
Re-download HDCP
Pass
Pass
Check the Input/Output
Of IC800
Fail
Re-soldering or 
Change the defect part
Repeat [A], & [B] Process
- 16 -
No Sound
Check The Input Sourse. 
Check The Input/Output
Of IC600.
Re-soldering or 
Change the defect part.
Fail
Pass
Pass
Check The Speaker.
Change Speaker.
Fail
Check The Speaker Wire.
Pass
Change The Source Input.
Fail
No Raster On AV (Video, S-Video)Signal
No Signal On TV(RF) Signal
Check Input source 
Cable And Jack
Pass
Check Input source 
Cable And Jack
Pass
Check The Input/Output
Of JK101, JK201
Pass
Re-soldering or 
Change the defect part
Pass
Fail
Pass
Repeat [A], & [B] Process
Check the Input/Output
Of IC800
Fail
Re-soldering or 
Change the defect part
Pass
Check The Input/Output
Of TU500
Pass
Re-soldering or 
Change the defect part
Pass
Fail
Check the Input/Output
Of IC800
Fail
Re-soldering or 
Change the defect part
Repeat [A], & [B] Process
Page of 28
Display

Click on the first or last page to see other 42LF20FR (CHASSIS:LP91A) service manuals if exist.