LG 22LS4D (CHASSIS:LD73B / NF036A) Service Manual ▷ View online
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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
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
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. Inspect (on the circuit board copper side) the solder joints of
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).
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.
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.
1. General Specification(TV)
No
Item
Specification
Remark
1.
Video input applicable system
PAL-D/K, B/G, I, SECAM
2.
Receivable Broadcasting System
1) PAL/SECAM BG
EU(PAL Market)
2) PAL/SECAM DK
3) SECAM L/L'
4) DVB-T
3.
RF Input Channel
VHF : E2 ~ E12
PAL
UHF : E21 ~ E69
CATV : S1 ~ S20
HYPER : S21~ S47
4.
Input Voltage
100-240V~ / 50Hz, 60Hz
5.
Market
EU
6.
Picture Size
22 inch
7.
Tuning System
FVS 100 program
PAL, 200 PR.(Option)
8.
Operating Environment
1) Temp : 0 ~ 40 deg
2) Humidity : 10~90 %
9.
Storage Environment
3) Temp : -20 ~ 50 deg
4) Humidity : 10~90 %
10.
Display
LCD Module
LPL
2. General Specification(LCD Module)
No
Item
Specification
Remark
1
Panel
22” TFT WSXGA LCD
2
Frequency range
H : 51.495 ~ 81.522 kHz
V : 48 ~ 77Hz
3
Power consumption
29.25 W
4
LCD Module- LPL
Type Size
493.7 x 320.1 x 16.5 (mm)
(H)x(V)x(D)
Pixel Pitch
0.282 x 0.282 (mm)
Pixel Format
1680 horiz. By 1050 vert. Pixels
RGB strip arrangement
Coating
Hard coating (3H), Anti-glare (Haze
25%) treatment of the front polarizer,
Back Light
4 CCFL
- 7 -
3. Optical Feature
4. Component Video Input (Y, P
B
, P
R
)
No
Item
Specification
Min.
Typ.
Max.
Remark
1
Viewing Angle [CR>10]
R/L, U/D
140, 130
2
Luminance
Luminance(cd/m
2
)
190
250
Variation
75%
Min/Max
3
Contrast Ratio
CR
400
700
All White/All Black
4
CIE Color Coordinates
White
Wx
Typ
0.313
Typ
Wy
-0.03
0.329
+0.03
Red
Xr
0.635
Yr
0.342
Green
Xg
0.292
Yg
0.611
Blue
Xb
0.147
Yb
0.070
No
Specification
Proposed
Resolution
H-freq(kHz)
V-freq(Hz)
1.
720X480
15.73
60.00
SDTV, DVD 480i
2.
720X480
15.63
59.94
SDTV, DVD 480i
3. 720X480
31.47
59.94
480p
4. 720X480
31.50
60.00
480p
5.
720X576
15.625
50.00
SDTV, DVD 625 Line
6. 720X576
31.25
50.00
HDTV
576p
7. 1280X720
45.00
50.00
HDTV
720p
8. 1280X720
44.96
59.94
HDTV
720p
9. 1280X720
45.00
60.00
HDTV
720p
10. 1920X1080
31.25
50.00
HDTV
1080i
11. 1920X1080
33.75
60.00
HDTV
1080i
12. 1920X1080
33.72
59.94
HDTV
1080i
13. 1920X1080
67.50
60.00
HDTV
1080p
- 8 -
6. RGB PC INPUT Mode Table
No
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
1.
720X400
31.468
70.08
28.321
2.
640X480
31.469
59.94
25.17
VESA
37.684
75.00
31.50
3.
800X600
37.879
60.31
40.00
VESA
46.875
75.00
49.50
4.
832X624
49.725
74.55
57.283
Macintosh
5.
1024X768
48.363
60.00
65.00
VESA(XGA)
56.470
70.00
75.00
60.123
75.029
78.75
6.
1280X768
47.693
59.99
80.125
VESA(WXGA)
7.
1360X768
47.649
59.94
84.625
VESA(WXGA)
8.
1366X768
47.649
59.94
84.625
Supported
9.
1280X1024
63.981
60.020
108.00
VESA(SXGA)
10
1440X900
55.469
59.901
88.750
CVT Red. Blanking
11.
1440X900
55.935
59.887
106.5
CVT
12.
1400X1050
64.744
59.948
101.00
CVT Red. Blanking
13.
1400X1050
65.317
59.978
121.750
CVT
14.
1680X1050
64.674
59.883
119.00
CVT Red. Blanking
15.
1680X1050
65.290
59.954
146.25
CVT
16.
1920X1080
66.647
59.988
138.625
WUXGA
7. HDMI DTV Table
No
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Remark
Proposed
1.
720X480
31.47
59.94
27.00
SDTV 480p 60Hz(4:3)
2.
720X480
31.50
60
27.027
SDTV 480p 60Hz(4:3)
3.
640X480
31.50
59.94
25.175
SDTV 480p 60Hz(4:3)
4.
640X480
31.50
60
25.20
SDTV 480p 60Hz(4:3)
5.
720X480
31.47
59.94
27.00
SDTV 480p 60Hz(16:9)
6.
720X480
31.47
60
27.027
SDTV 480p 60Hz(16:9)
7.
720X576
31.25
50.00
27.000
SDTV 576p 50Hz
8.
1280X720
45.00
50.00
74.176
HDTV 720p 50Hz
HDCP
9.
1280X720
44.96
59.94
74.176
HDTV 720p 60Hz
HDCP
10.
1280X720
44.96
60
74.250
HDTV 720p 60Hz
HDCP
11.
1920X1080
28.13
50.00
74.250
HDTV 1080i 50Hz
HDCP
12.
1920X1080
33.72
59.94
74.176
HDTV 1080i 60Hz
HDCP
13.
1920X1080
33.75
60
74.250
HDTV 1080i 60Hz
HDCP
14.
1920X1080
27
24
74.250
HDTV 1080P 24Hz
HDCP
15.
1920X1080
56.25
50.00
148.500
HDTV 1080P 50Hz
HDCP
16.
1920X1080
67.43
59.94
148.352
HDTV 1080P 60Hz
HDCP
17.
1920X1080
67.50
60
148.500
HDTV 1080P 60Hz
HDCP
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