DOWNLOAD LG 42LH90QD (CHASSIS:LT91C) Service Manual ↓ Size: 7.11 MB | Pages: 72 in PDF or view online for FREE

Model
42LH90QD (CHASSIS:LT91C)
Pages
72
Size
7.11 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lh90qd-chassis-lt91c.pdf
Date
PREV: LG 42LH90 (CHASSIS:LA92C) Service Manual

LG 42LH90QD (CHASSIS:LT91C) Service Manual ▷ View online

- 9 -
8. POWER
No 
Item 
Min 
Typ
Max 
Unit 
Remarks
1.
AC Power Shut Down Voltage 
90 
264 
Vac
42”
21.6 
24 
26.4 
Vdc
2 
DC Voltage,Inverter                      47”
21.6
24 
26.4 
Vdc
55”
21.6 
24 
26.4 
Vdc
42”
11.4 
12.0 
12.6 
Vdc
3.
DC Voltage,LCD Panel                 47”
11.4 
12.0 
12.6 
Vdc
55”
21.6 
24 
26.4 
Vdc
4.
DC Voltage,Stand By 
4.94 
5.2 
5.46 
Vdc
DC Voltage,Sound AMP (24V)
24 
Vdc 
42/47/55LH90QD-DC
5.
DC Voltage,Sound AMP (3.3V)
2.97 
3.3 
3.63
Vdc 
ALL
DC Voltage,Sound AMP (1.8V)
1.62
1.8 
1.98 
Vdc 
ALL 
6.
DC Voltage,Tuner (3.3V)
3.1 
3.3
3.5
DC Voltage,Tuner (1.8V)
1.6 
1.8
2.0
Vdc
DC Voltage,Mstar (3.3V)
3.1 
3.3
3.5 
Vdc 
7.
DC Voltage,Mstar (1.8V)
1.6  
1.8 
2.0 
Vdc
DC Voltage,Mstar (1.26V)
1.06
1.26
1.46 
Vdc 
LGE3369
DC Voltage,Mstar (3.3V)
3.1 
3.3
3.5 
Vdc
8.
DC Voltage,Mstar (1.8V)
1.6  
1.8 
2.0  
Vdc 
DC Voltage,Mstar (1.26V)
1.06 
1.26 
1.46
Vdc
LGE7329
9.
DC Voltage,Local Dimming (3.3V)
3.1 
3.3 
3.5
Vdc
DC Voltage,Local Dimmin (1.8V)
1.6 
1.8 
2.0
Vdc 
LGE5110
No 
Item 
Min 
Typ 
Max 
Unit 
Remarks
1.
Video Input Level 
0.9 
1 
1.1 
Vpp
2.
Audio Input Level 
0.4 
0.5 
0.6 
Vrms
PAL
3.
Component Video Input Level (Y,C
B
/P
B
,C
R
/P
R
) 
0.6 
0.7 
0.8 
Vpp
4.
R/G/B Video Input Level,
0.6 
0.7 
0.8 
Vpp
9. Standard Level For Input Signal (Video,Audio,Y/C,Component,RGB)
- 10 -
10. Component Video Input (Y, C
B
/P
B
, C
R
/P
R
)
No
Specification
Remark
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 
56.250
50 
HDTV 1080p
14.
1920x1080
67.43/67.5
59.94/60 
HDTV 1080p
No
Specification
Proposed
Remark
Resolution
H-freq(kHz)
V-freq(Hz)
Pixel Clock(MHz)
1.
720*400 
31.468 
70.08
28.321 
For only DOS mode
2.
640*480 
31.469 
59.94
25.17 
VESA
Input 848*480 60Hz, 852*480 60Hz
-> 640*480 60Hz Display
3.
800*600
37.879
60.31
40.00 
VESA
4.
1024*768
48.363
60.00
65.00
VESA(XGA)
5.
1280*768 
47.78 
59.87
79.5 
WXGA  
6.
1360*768 
47.72
59.8
84.75 
WXGA
7.
1280*1024 
63.595 
60.0 
108.875
SXGA
FHD model 
8.
1920*1080 
66.587
59.93
138.625
WUXGA
FHD model
11. RGB (PC)
12. HDMI Input (PC/DTV)
12.1 DTV Mode
No
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Remark
1.
720*480 
31.469 /31.5 
59.94 / 60
27.00/27.03
SDTV 480P
2.
720*576 
31.25 
50
54 
SDTV 576P
3.
1280*720 
37.500 
50
74.25 
HDTV 720P
4.
1280*720 
44.96 / 45 
59.94 / 60
74.17/ 74.25 
HDTV 720P
5.
1920*1080 
33.72 / 33.75 
59.94 / 60
74.17/ 74.25 
HDTV 1080I 
6.
1920*1080 
28.125 
50.00
74.25 
HDTV 1080I
7.
1920*1080 
26.97 / 27 
23.97 / 24
74.17/ 74.25 
HDTV 1080P
8.
1920*1080
33.716 / 33.75
29.976 / 30.00
74.25
HDTV 1080P
9.
1920*1080 
56.250 
50
148.5
HDTV 1080P
10.
1920*1080 
67.43 / 67.5 
59.94 / 60
148.35/148.50 
HDTV 1080P
- 11 -
No
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
Remark
1.
720*400 
31.468 
70.08 
28.321 
HDCP
2.
640*480 
31.469 
59.94 
25.17
VESA 
HDCP
3. 
800*600
37.879
60.31 
40.00 
VESA 
HDCP
4.
1024*768
48.363
60.00 
65.00 
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.
1280*1024 
63.595
60.0 
108.875 
SXGA
HDCP
8.
1920*1080
67.5
60
148.5
WUXGA
HDCP
12.2  PC Mode
No
Item
Content
Unit
Remark  
Width(W)
Length(L)   
Height(H)
W/O Packing
1065.9 
361.7 
776 
mm 
With Stand
1
Product
1065.9 
94.4 
716.4 
mm 
W/O Stand
Dimension
1342 
287 
830 
mm 
With Stand
With Packing
1168 
291 
810
mm 
W/O Stand
W/O Packing
23.2
Kg
With Stand
2
Product
19.5
Kg
W/O Stand
Weight
With Packing
28.2
Kg
With Stand
24.5
Kg
W/O Stand
Cintaniner
40ft(Normal)                  40ft(H-Cubic)
3
Loding 
Individual 
W/O stand   With stand   W/O stand   With stand
Quantity
136             204               162             243 
Swivel
YES
Function
Angle
±20°
Degree
Tilt
NO  
Angle 
-
Degree
Width 
Depth 
Height
4 
Stand Assy
Dimension 
457.9 
361.7 
194.8 
mm 
With Neck
(W/O Packing)
457.9 
361.7 
99 
mm 
W/O Neck
Dimension
(With Packing)
606 
505 
280 
mm 
Commercial
Weight(W/O Packing)
--
--
2.7 
Kg 
With Neck
Weight(With Packing)
--
--
4.3 
Kg
5 
Appearance 
Refer to Standard of LG(56)G4-9002
13. Mechanical specification
- 12 -
ADJUSTMENT INSTRUCTION
1. Application Range
This  specification  sheet  is  applied  to  all  of  the  LCD  TV  with
LT91C chassis.
2. Designation
1) The  adjustment  is  according  to  the  order  which  is
designated  and  which  must  be  followed,  according  to  the
plan which can be changed only on agreeing.
2) Power Adjustment: Free Voltage
3) Magnetic Field Condition: Nil.
4) Input signal Unit: Product Specification Standard
5) Reserve after operation: Above 5 Minutes (Heat Run)
Temperature : at 25±5ºC 
Relative humidity : 65±10%
Input voltage : 220V, 60Hz
6) Adjustment  equipments:  Color  Analyzer  (CA-210  or  CA-
110),  Pattern  Generator(MSPG-925L  or  Equivalent),  DDC
Adjustment Jig equipment, SVC remote controller
7) Push The “IN STOP KEY” - For memory initialization.
3. Main PCB check process
* APC - After Manual-Insert, executing APC
* Boot file Download
(1) Execute  ISP  program  “Mstar  ISP  Utility”  and  then  click
“Config” tab.
(2) Set as below, and then click “Auto Detect” and check “OK”
message.
If  “Error”  is  displayed,  Check  connection  between
computer, jig, and set..
(3) Click  “Read”  tab,  and  then  load  download  file  (XXXX.bin)
by clicking “Read”.
(4) Click  “Connect”  tab.  If  “Can’t”  is  displayed,  check
connection between computer, jig, and set.
(5) Click “Auto” tab and set as below
(6) Click “Run”.
(7) After downloading, check “OK” message.
                    filexxx.bin 
(7) 
(5) 
(8) ……….OK 
(6) 
(1) 
(3) 
(2)
OK
Please Check the Speed : 
To use speed between 
from 200KHz to 400KHz 
(4) 
filexxx.bin 
Case1 : Software version up
1. After  downloading  S/W  by  USB,  TV  set  will  reboot
automatically
2. Push “In-stop” key
3. Push “Power on” key
4. Function inspection
5. After function inspection, Push “I n-stop” key.
Case2 : Function check at the assembly line
1. When  TV  set  is  entering  on  the  assembly  line,  Push
“In-stop” key at first.
2. Push “Power on” key for turning it on.
-> If  you  push  “Power  on”  key,  TV  set  will  recover
channel information by itself.
3. After function inspection, Push “In-stop” key.
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