DOWNLOAD LG 55EA9800-SA (CHASSIS:EJ34D) Service Manual ↓ Size: 7.81 MB | Pages: 99 in PDF or view online for FREE

Model
55EA9800-SA (CHASSIS:EJ34D)
Pages
99
Size
7.81 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
55ea9800-sa-chassis-ej34d.pdf
Date

LG 55EA9800-SA (CHASSIS:EJ34D) 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  spec  sheet  is  applied  all  of  the  55”,  OLED  TV  with  
EJ34D chassis
2. Test condition
Each part is tested as below without special notice.
1) Temperature : 25 ºC ± 5 ºC, CST : 40 ºC±5 ºC
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.
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
 
4. General Specification
No
Item
Specification
Remark
1.
Display Screen Device
55” wide color display  module
55EA9800-SA
2.
Aspect Ratio
16:9
All
3.
LCD Module
LC550LUD-MFP2
55EA9800-SA
4.
Operating Environment
TFT
Temp. : 0 ~ 40 deg
Humidity : 0 ~ 85%
LGE SPEC
ALEF
Temp.   : 0 ~ 50 deg
Humidity : 20 ~ 90%
5.
Storage Environment
TFT
Temp. : -20 ~ 60 deg
Humidity : 10 ~ 90%
ALEF
Temp.   : 0 ~ 50 deg
Humidity : 20 ~ 90%
6.
Input Voltage
AC100 ~ 240V, 50/60Hz
- 7 -
5. External input format
5.1. 2D mode
5.1.1. Component input (Y, CB/PB, CR/PR)
 
No.
Resolution
H-freq(kHz)
V-freq.(kHz)
Pixel clock
Proposed
1.
720*480
15.73
60.00
13.5135
SDTV ,DVD 480I
2.
720*480
15.73
59.94
13.50
SDTV ,DVD 480I
3.
720*480
31.50
60.00
27.027
SDTV 480P
4.
720*480
31.47
59.94
27.00
SDTV 480P
5.
1280*720
45.00
60.00
74.25
HDTV 720P
6.
1280*720
44.96
59.94
74.176
HDTV 720P
7.
1920*1080
33.75
60.00
74.25
HDTV 1080I
8.
1920*1080
33.72
59.94
74.176
HDTV 1080I
9.
1920*1080
67.50
60.00
148.50
HDTV 1080P
10.
1920*1080
67.432
59.94
148.352
HDTV 1080P
11.
1920*1080
27.00
24.00
74.25
HDTV 1080P
12.
1920*1080
26.97
23.94
74.176
HDTV 1080P
13.
1920*1080
33.75
30.00
74.25
HDTV 1080P
14.
1920*1080
33.71
29.97
74.176
HDTV 1080P
- 8 -
5.1.2. HDMI Input 1 (PC/DTV)
No
Resolution
H-freq(kHz)
V-freq.(kHz)
Pixel clock
Proposed
HDMI-PC
1
640*350
31.468
70.09
25.17
EGA
Х
2
720*400
31.469
70.08
28.32
DOS
O
3
640*480
31.469
59.94
25.17
VESA(VGA)
O
4
800*600
37.879
60.31
40.00
VESA(SVGA)
O
5
1024*768
48.363
60.00
65.00
VESA(XGA)
O
6
1152*864
54.348
60.053
80.00
VESA
O
7
1280*1024
63.981
60.020
108.00
VESA (SXGA)
O
8
1360*768
47.712
60.015
85.50
VESA (WXGA)
O
9
1920*1080
67.5
60
148.5
WUXGA(Reduced Blanking)
O
10
3840*2160
54
24.00
297.00
UDTV 2160P
Only UD Model
11
3840*2160
56.25
25.00
297.00
UDTV 2160P
Only UD Model
12
3840*2160
67.5
30.00
297.00
UDTV 2160P
Only UD Model
HDMI-DTV
1
720*576
15.625
50
13.50
SDTV, DVD 576I(625I)
2
640*480
31.47
59.94
25.175
SDTV 480P
3
640*480
31.5
60
25.200
SDTV 480P
4
720*480
31.47
59.94
27.00
SDTV 480P
5
720*480
31.5
60
27.027
SDTV 480P
6
720*576
31.25
50
27
SDTV 576P
7
1280*720
37.50
50.00
74.25
HDTV 720P
8
1280*720
45.00
60.00
74.25
HDTV 720P
9
1280*720
44.96
59.94
74.176
HDTV 720P
10
1920*1080
33.75
60.00
74.25
HDTV 1080I
11
1920*1080
33.72
59.94
74.176
HDTV 1080I
12
1920*1080
28.125
50
74.25
HDTV 1080I
13
1920*1080
67.500
60
148.50
HDTV 1080P
14
1920*1080
67.432
59.939
148.352
HDTV 1080P
15
1920*1080
27.000
24.000
74.25
HDTV 1080P
16
1920*1080
26.97
23.976
74.176
HDTV 1080P
17
1920*1080
33.75
30.000
74.25
HDTV 1080P
18
1920*1080
33.71
29.97
74.176
HDTV 1080P
19
1920*1080
28.125
25
74.25
HDTV 1080P
20
1920*1080
56.25
50
148.5
HDTV 1080P
21
3840*2160
53.95
23.976
297.00
UDTV 2160P
22
3840*2160
54
24.00
297.00
UDTV 2160P
23
3840*2160
56.25
25.00
297.00
UDTV 2160P
24
3840*2160
61.43
29.970
297.00
UDTV 2160P
25
3840*2160
67.5
30.00
297.00
UDTV 2160P
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