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Model
42LM670S 42LM670T 42LM671S 42LM671T (CHASSIS:LD22E)
Pages
119
Size
10.96 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lm670s-42lm670t-42lm671s-42lm671t-chassis-ld22e.pdf
Date

LG 42LM670S / 42LM670T / 42LM671S / 42LM671T (CHASSIS:LD22E) 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 cir-
cuit 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.
2.  Draw away the melted solder with an anti-static suction-type 
solder removal device (or with solder braid) before removing 
the IC.
Replacement
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 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 
leads extending from the circuit board and crimp the "U" with 
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 
board.
4.  Insert new transistor in the circuit board.
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 pos-
sible 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 
the two "original" leads. If they are not shiny, reheat them and if 
necessary, apply additional solder.
Fuse and Conventional Resistor
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.
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.
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 connec-
tions).
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.
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.
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.
2.  Trace along the copper pattern from both sides of the pattern 
break and locate the nearest component that is directly con-
nected 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.
- 6 -
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
1. Application range
This  specification  is  applied  to  the  LCD  TV  used  LD22E 
chassis.
2. Requirement for Test
Each part is tested as below without special appointment.
1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C
2) Relative Humidity: 65 % ± 10 %
3) Power Voltage
: Standard input voltage (AC 100-240 V~, 50/60 Hz)
* 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.
5)  The receiver must be operated for about 20 minutes prior to 
the adjustment.
3. Test method
1) Performance: LGE TV test method followed 
2) Demanded other specification 
- Safety : CE, IEC specification
- EMC : CE, IEC 
- Wireless : Wireless HD Specification (Option)
4. Model General Specification
No.
Item
Specification
Remarks
1
Market
EU(PAL Market-36Countries)
DTV & Analog (Total 37 countries)
DTV (MPEG2/4, DVB-T) : 30 countries
Germany, Netherland, Switzerland, Hungary, Austria, 
Slovenia, Bulgaria, France, Spain, Italy, Belgium, Russia, 
Luxemburg, Greece, Czech, Croatia, Turkey, Moroco, Ire-
land, Latvia, Estonia, Lithuania, Poland, Portugal, Romania, 
Albania, Bosnia, Serbia, Slovakia, Beralus
DTV (MPEG2/4, DVB-T2) : 7 countries
UK, Sweden, Denmark, Finland, Norway, Ukraine, Kaza-
khstan, Ireland
DTV (MPEG2/4, DVB-C) :  37 countries
Germany, Netherland, Switzerland, Hungary, Austria, 
Slovenia, Bulgaria, France, Spain, Italy, Belgium, Russia, 
Luxemburg, Greece, Czech, Croatia, Turkey, Moroco, Ire-
land, Latvia, Estonia, Lithuania, Poland, Portugal, Romania, 
Albania, Bosnia, Serbia, Slovakia, Beralus, UK, Sweden, 
Denmark, Finland, Norway, Ukraine, Kazakhstan
DTV (MPEG2/4,DVB-S) : 30 countries
Germany, Netherland, Switzerland, Hungary, Austria, 
Slovenia, Bulgaria, France, Spain, Italy, Belgium, Russia, 
Luxemburg, Greece, Czech, Croatia, Turkey, Moroco, Ire-
land, Latvia, Estonia, Lithuania, Poland, Portugal, Romania, 
Albania, Bosnia, Serbia, Slovakia, Beralus
Supported satellite : 22 satellites
HISPASAT 1C/1D, ATLANTIC BIRD 2, NILESAT 101/102, 
ATLANTIC  BIRD 3, AMOS 2/3, THOR 5/6, IRIUS 4, EU-
TELSAT-W3A, EUROBIRD 9°, EUTELSAT-W2A, HOTBIRD 
6/8/9, EUTELSAT-SESAT, ASTRA 1L/H/M/KR, ASTRA 
3°/3B, BADR 4/6, ASTRA 2D, EUROBIRD 3, EUTELSAT-
W7, HELLASSAT 2, EXPRESS AM1, TURKSAT 2°/3°, 
INTERSAT10
- 7 -
No.
Item
Specification
Remarks
2
Broadcasting system
1) PAL-BG
2) PAL-DK
3) PAL-I/I’
4) SECAM L/L’, DK, BG, I
5) DVB-T
6) DVB-C
7) DVB-T2
8) DVB-S
DVB-S: Satellite
3
Receiving system
Analog : Upper Heterodyne
Digital : COFDM, QAM
► DVB-T
- Guard Interval(Bitrate_Mbit/s)
1/4, 1/8, 1/16, 1/32
- Modulation : Code Rate
QPSK    :  1/2, 2/3, 3/4, 5/6, 7/8
16-QAM  :  1/2, 2/3, 3/4, 5/6, 7/8
64-QAM  :  1/2, 2/3, 3/4, 5/6, 7/8
► DVB-T2
- Guard Interval(Bitrate_Mbit/s)
  1/4, 1/8, 1/16, 1/32, 1/128, 19/128, 19/256,
- Modulation : Code Rate
  QPSK    : 1/2, 2/5, 2/3, 3/4, 5/6
  16-QAM  : 1/2, 2/5, 2/3, 3/4, 5/6
  64-QAM  : 1/2, 2/5, 2/3, 3/4, 5/6
  256-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
► DVB-C
- Symbolrate :
  4.0Msymbols/s to 7.2Msymbols/s
- Modulation :
  16QAM, 64-QAM, 128-QAM and 256-QAM
► DVB-S/S2
- symbolrate
  DVB-S2 (8PSK / QPSK) : 2 ~ 45Msymbol/s
  DVB-S  (QPSK) : 2 ~ 45Msymbol/s
- viterbi
  DVB-S mode  : 1/2, 2/3, 3/4, 5/6, 7/8
  DVB-S2 mode : 1/2, 2/3, 3/4, 3/5, 4/5, 5/6, 8/9, 9/10 
4
Scart Gender Jack (1EA) PAL, SECAM
Scart jack is Full scart and support MNT/DTV-OUT
(not support DTV Auto AV)
5
Video Input RCA(1EA)
PAL, SECAM, NTSC
4 System : PAL, SECAM, NTSC, PAL60
AV gender jack 1EA
6
Head phone out
Antenna, AV1, AV2,  Component, 
RGB, HDMI1, HDMI2, HDMI3, 
HDMI4, USB1, USB2, USB3
7
Component Input (1EA)
Y/Cb/Cr
Y/Pb/Pr
Component Gender 1EA
8
RGB Input
RGB-PC
Analog(D-SUB 15PIN)
9
HDMI Input (4EA)
HDMI1-DTV
HDMI2-DTV
HDMI3-DTV
HDMI4-DTV
HDMI4 : PC support(HDMI version 1.3)
Support HDCP
10
Audio Input (3EA)
RGB/DVI Audio
Component
AV
L/R Input
11
SPDIF out (1EA)
SPDIF out
12
USB (3EA)
EMF, DivX HD, For SVC (download)
JPEG, MP3, DivX HD
13
Ethernet Connect(1EA)
Ethernet Connect
- 8 -
5. Component Video Input (Y, C
b
/P
b
, C
r
/P
r
)
6. RGB input (PC)
No.
Resolution
H-freq(kHz)
V-freq(Hz)
Porposed
1
720×480
15.73
60.00
SDTV, DVD 480i
2
720×480
15.63
59.94
SDTV, DVD 480i
3
720×480
31.47
59.94
480p
4
720×480
31.50
60.00
480p
5
720×576
15.625
50.00
SDTV, DVD 625 Line
6
720×576
31.25
50.00
HDTV 576p
7
1280×720
45.00
50.00
HDTV 720p
8
1280×720
44.96
59.94
HDTV 720p
9
1280×720
45.00
60.00
HDTV 720p
10
1920×1080
31.25
50.00
HDTV 1080i
11
1920×1080
33.75
60.00
HDTV 1080i
12
1920×1080
33.72
59.94
HDTV 1080i
13
1920×1080
56.250
50
HDTV 1080p
14
1920×1080
67.5
60
HDTV 1080p
No.
Resolution
H-freq(kHz)
V-freq.(Hz)
Proposed
1
640 x 350 @70Hz
31.468
70.09
EGA
2
720 x 400 @70Hz
31.469
70.08
DOS
3
640 x 480 @60Hz
31.469
59.94
VESA(VGA)
4
800 x 600 @60Hz
37.879
60.31
VESA(SVGA)
5
1024 x 768 @60Hz
48.363
60.00
VESA(XGA)
6
1152 x 864 @60Hz
54.348
60.053
VESA
7
1360 x 768 @60Hz
47.712
60.015
VESA(WXGA)
8
1920 x 1080 @60Hz
67.5
60.00
WUXGA(Reduced Blanking))
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