LG 22LH20R (CHASSIS:LP91A) Service Manual ▷ View online
- 5 -
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by gently
1. Desolder and straighten each IC lead in one operation by gently
prying up on the lead with the soldering iron tip as the solder
melts.
melts.
2. Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing the
IC.
IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close as
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close as
possible to the component body.
2. Bend into a "U" shape the end of each of three leads remaining
on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.
long nose pliers to insure metal to metal contact then solder
each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
1. Remove defective diode by clipping its leads as close as
possible to diode body.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5.
5.
Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.
necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed whenever
this condition is encountered.
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed whenever
this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC
connections).
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC
connections).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the good
copper pattern. Solder the overlapped area and clip off any
excess jumper wire.
copper pattern. Solder the overlapped area and clip off any
excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern
break and locate the nearest component that is directly
connected to the affected copper pattern.
connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the lead
of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.
of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.
- 6 -
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
4. Electrical specification
4.1 General Specification
1. Application range
This spec sheet is applied to LCD TV used LP91A chassis.
2. Specification
Each part is tested as below without special appointment.
1) Temperature : 25±5ºC (77±9ºF), CST : 40±5ºC
2) Relative Humidity : 65±10%
3) Power Voltage : Standard input voltage(100~240V@50/60Hz)
2) Relative Humidity : 65±10%
3) Power Voltage : Standard input voltage(100~240V@50/60Hz)
* Standard Voltage of each products is marked by models.
4) Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM.
accordance with BOM.
5) The receiver must be operated for about 5 minutes prior to
the adjustment.
3. Test method
1) Performance: LGE TV test method followed
2) Demanded other specification
2) Demanded other specification
- Safety: CE, IEC specification
- EMC : CE, IEC
- EMC : CE, IEC
No
Item Specification
Measurement
Remark
1
Screen Size
22” wide Color Display Module
Resolution: 1366*768
2
Aspect Ratio
16:9
3
LCD Module
22” TFT WXGA LCD
4
Operating Environment Temp.: 0 ~ 40 deg
Humidity : 0 ~ 80 %
5
Storage Environment
Temp.: -20 ~ 60 deg
Humidity : 0~ 85 %
6
Input Voltage
AC100-240V~, 50/60Hz
≤
65 W
22” HD
7
LDC Module
HD
626 x 373 x 44.1
with inverter
(Maker : LGD)
0.1405 x 0.4215
12 EEFL
Coating
3H
No.
Item Min.
Typ.
Max.
Unit
Maker
Remark
1.
Luminance
280
350
cd/m2
(W/O PC mode)
2.
VIew angle (R/L, U/D)
178 / 178
degree
CR > 10
3.
Color Coordinates
White
Wx
Typ
0.285
Typ
LGD 22”(HD)
Wy
-0.03
0.293
+0.03
LC220WXE-TBA1
RED
Xr
0.642
Yr
0.333
Green
Xg 0.295
Yg 0.608
Blue
Xb 0.147
Yb
0.063
4.
Contrast ratio
700:1
1000:1
LGD 22”(HD)
5. Luminance
Variation
1.3
- 7 -
5. Chroma& Brightness (Optical)
5.1. LCD Module
the Color Coordinates check condition
- 50cm from the surface, Full White Pattern
- Picture mode Vivid
- Picture mode Vivid
8. Component Video Input (Y, P
B
, P
R
)
No
Specification
Remark
Resolution
H-freq(kHz)
V-freq(Hz)
Pixel Clock(MHz)
1
720* 480
15.73
59.94
13.500
SDTV, DVD 480I( 525I)
2
720* 480
15.75
60.00
13.514
SDTV, DVD 480I( 525I)
3
720* 576
15.625
50.00
13.500
SDTV, DVD 576I( 625I) 50Hz
4 720*
480
31.47
59.94
27.000
SDTV
480P
5 720*
480
31.50
60.00
27.027
SDTV
480P
6
720* 576
31.25
50.00
27.000
SDTV 576P 50Hz
7
1280* 720
44.96
59.94
74.176
HDTV 720P
8
1280* 720
45.00
60.00
74.250
HDTV 720P
9
1280* 720
37.50
50.00
74.25
HDTV 720P 50Hz
10
1920* 1080
28.125
50.00
74.250
HDTV 1080I 50Hz,
11
1920* 1080
33.72
59.94
74.176
HDTV 1080I
12
1920* 1080
33.75
60.00
74.25
HDTV 1080I
13 1920*
1080
56.25
50
148.5
HDTV
1080P
14 1920*
1080
67.432
59.94
148.350
HDTV
1080P
15 1920*
1080
67.5
60.00
148.5
HDTV
1080P
- 8 -
No
Specification
Remark
Resolution
H-freq(kHz)
V-freq(Hz)
Pixel Clock(MHz)
1 640*
350
31.468
70.09
25.17 EGA
2 720*
400
31.469
70.09
28.32 DOS
3
640* 480
31.469
59.94
25.17
VESA( VGA)
4 800*
600
37.879
60.317
40
VESA(
SVGA)
5
1024* 768
48.363
60.004
65
VESA( XGA)
6
1280* 768
47.776
59.87
79.5
VESA( WXGA)
7
1360* 768
47.72
59.799
84.75
VESA( WXGA)
8
1280* 1024
63.668
59.895
109.00
XGA
Only FHD Model
9
1920* 1080
66.587
59.934
138.50
WUXGA(Reduced Blanking)
Only FHD Model
9. RGB
9.1 Analog PC, RGB- DTV –NOT SUPPORT
10. HDMI Input
10.1 PC –Spec. out but it can be shown the picture at only HDMI/ DVI IN 1 via DVI to HDMI Cable)
No
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Remark
1
640 x 480
31.469
59.94
25.17
VESA( VGA)
2
800 x 600
37.879
60.317
40.00
VESA( SVGA)
3
1024 x 768
48.363
60.004
65.00
VESA( XGA)
4
1280 x 768
47.776
59.87
79.5
VESA( WXGA)
5
1360 x 768
47.72
59.799
84.62
VESA( WXGA)
6
1366 x 768
47.7
60.00
84.62
WXGA
7
1280 x 1024
63.595
60.00
108.875
SXGA
8
1920 x 1080
66.647
59.988
138.625
WUXGA
10.2 DTV Mode
No
Specification
Remark
Resolution
H-freq(kHz)
V-freq(Hz)
Pixel Clock(MHz)
1
720 x 480
15.73
59.94
13.500
SDTV, DVD 480I(525I)
2
720 x 480
15.75
60.00
13.514
SDTV, DVD 480I(525I)
Spec. out
3
720 x 576
15.625
50.00
13.500
SDTV, DVD 576I(625I) 50Hz
but display.
4
720 x 480
31.47
59.94
27
SDTV 480P
5
720 x 480
31.5
60.00
27.027
SDTV 480P
6
720 x 576
31.25
50.00
27
SDTV 576P
7
1280 x 720
44.96
59.94
74.176
HDTV 720P
8
1280 x 720
45
60.00
74.25
HDTV 720P
9
1280 x 720
37.5
50.00
74.25
HDTV 720P
10
1920 x 1080
28.125
50.00
74.25
HDTV 1080I
11
1920 x 1080
33.72
59.94
74.176
HDTV 1080I
12
1920 x 1080
33.75
60.00
74.25
HDTV 1080I
13
1920 x 1080
56.25
50.00
148.5
HDTV 1080P
14
1920 x 1080
67.432
59.94
148.350
HDTV 1080P
15
1920 x 1080
67.5
60.00
148.5
HDTV 1080P
16
1920 x 1080
27
24.00
74.25
HDTV 1080P
17
1920 x 1080
33.75
30.00
74.25
HDTV 1080P
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