LG 32LG30D (CHASSIS:LB81A) 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.
1. Application range
This specification is applied to the LCD TV used LB81A
chassis.
chassis.
2. Requirement for Test
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(110V~@ 60Hz)
2) Relative Humidity : 65±10%
3) Power Voltage : Standard input voltage(110V~@ 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: CB specification
- EMC:
- EMC:
CISPR 13 specification
- 6 -
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
4. General specification
Item
Specification
Remark
Broadcasting system
Analog : NTSC-M, DTV:DVB-T
Available Channel
1) VHF : 2 ~ 13
2) UHF : 14 ~ 69
3) CATV : 1 ~ 125
4) DTV : 14~69
Tuner IF
1) NTSC : 42.75 MHz(Picture),
41.25 MHz(Sound)
2) DVB-T : 36.125MHz
Input Voltage
110V~, 60Hz
Mark : 240V, 50Hz
Screen Size
32 inch Wide (1366 x 768)
Aspect Ratio
16:9
Module
LC320WXN-SAA1
Operating Environment
1) Temp : 0 ~ 40 deg
2) Humidity : ~ 80 %
LGE Spec
Storage Environment
1) Temp : -20 ~ 60 deg
2) Humidity : ~ 85 %
Model
Market
Appliance
32LG30D-DA
Taiwan
BSMI
- 7 -
6. RGB PC INPUT Mode
No
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Remark
1
720*400
31.468
70.08
28.321
2
640*480
31.469
59.94
25.17
VESA
Input 848*480 60Hz, 852*480 60Hz
37.684
75.00
31.50
--> 640*480 60Hz Display
3
800*600
37.879
60.31
40.00
VESA
46.875
75.00
49.50
4
1024*768
48.363
60.00
65.00
VESA(XGA)
56.470
70.00
75.00
60.123
75.029
78.75
5
1280*768
47.78
59.87
79.5
WXGA
6
1360*768
47.72
59.8
84.75
WXGA
7
1366*768
47.56
59.6
84.75
WXGA
5. Component Video Input (Y, P
B
, P
R
)
No
Specification
Remark
Resolution
H-freq(kHz)
V-freq(Hz)
1
720x480
15.73
59.94
SDTV, DVD 480i
2
720x480
15.75
60
SDTV, DVD 480i
3
720x480
31.47
59.94
SDTV 480p
4
720X480
31.5
60
SDTV 480p
5
720x576
15.625
50
SDTV, DVD 576i
6
720x576
31.25
50
SDTV 576p
7
1280x720
44.96
59.94
HDTV 720p
8
1280x720
45
60.36
HDTV 720p
9
1280x720
37.5
50
HDTV 720p
10
1920x1080
28.125
50
HDTV 1080i
11
1920x1080
33.75
60
HDTV 1080i
12
1920x1080
33.72
59.94
HDTV 1080i
13
1920x1080
56.25
50
HDTV 1080p
14
1920x1080
67.433
59.94
HDTV 1080p
15
1920x1080
67.5
60
HDTV 1080p
- 8 -
7. HDMI Input (PC/DTV)
No
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Remark
PC
1
720*400
31.468
70.08
28.321
HDCP
2
640*480
31.469
59.94
25.17
VESA
HDCP
37.684
75.00
31.50
3
800*600
37.879
60.31
40.00
VESA
HDCP
46.875
75.00
49.50
4
1024*768
48.363
60.00
65.00
56.470
70.00
75.00
VESA(XGA)
HDCP
5
1280*768
47.78
59.87
79.5
WXGA
HDCP
6
1360*768
47.72
59.8
84.75
WXGA
HDCP
7
1366*768
47.56
59.6
84.75
WXGA
HDCP
DTV
1
720*480
31.47
59.94
27.00
SDTV 480P(4:3)
2
720*480
31.50
60
27.027
SDTV 480P(4:3)
3
640*480
31.469
59.94
25.175
SDTV 480P(4:3)
4
640*480
31.469
60.00
25.20
SDTV 480P(4:3)
5
720*480
31.47
59.94
27.000
SDTV 480P(16:9)
6
720*480
31.50
60.00
27.027
SDTV 480P(16:9)
7
720*576
31.25
50.00
27.000
SDTV 576P
8
1280*720
37.50
50.00
74.176
HDTV 720P
HDCP
9
1280*720
44.96
59.94
74.176
HDTV 720P
HDCP
10
1280*720
45.00
60.00
74.250
HDTV 720P
11
1920*1080
33.72
59.94
74.176
HDTV 1080I
HDCP
12
1920*1080
33.75
60.00
74.250
HDTV 1080I
HDCP
13
1920*1080
28.125
50.00
74.250
HDTV 1080I 50Hz
HDCP
14
1920*1080
27.000
24.00
74.250
HDTV 1080P 24Hz HDCP
15
1920*1080
56.250
50
148.500
HDTV 1080P 50Hz HDCP
16
1920*1080
67.433
59.94
148.352
HDTV 1080P
HDCP
17
1920*1080
67.500
60
148.500
HDTV 1080P
HDCP
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