LG 42LD400 Support Question
LG 42LD400 Support Question
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Question posted by sfglee on August 20th, 2012
There Is No Power In Lg 42ld400 (1yr And 8 Months Old) When Turned On.
One day, when I turned on the TV, I found there is no power coming with it. I opened the back case and check the continuity of the main fuse next to the power socket. It's 0.5 ohms. I also check the pin-connector (wide one), the 5V pin gave a 5.1V signal, but the 12 V pin gave nothing. I don't know where to go to further troubleshoot it. I appreciate your help.
Current Answers
Answer #1: Posted by TVDan on August 21st, 2012 2:02 AM
TVDan
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The fuse is good and the standby 5vc is present going to the main. The 12vdc is only there when the main board send 3.3vdc back to the power board to tell it to activate the run voltages. Chances are the main board is locked up in the boot sequence and will not turn on the set. We force the power supply on by putting two AA batteries in series and put the 3vdc to the power on pin, then verify the run voltages are present (thus proving it's not a power board issue). Then by process of elimination disconnect the plugs to the main to make sure it's not a bad key board, IR receiver board, T-Con and speakers. If when these are disconnected and the set is still basically dead then the main board is the likely culprit.
LGE COV30572401 BOARD, POWER SUPPLY
LGE COV30573001 BOARD, MAIN ASSY
TV Dan
Related LG 42LD400 Manual Pages
Owner's Manual - Page 1
LCD TV MODELS 32LD400 42LD400 47LD500
P/NO :1947-1600-1050
www.lg.com OWNER'S MANUAL
LCD TV
Please read this manual carefully before operating your set and retain it for future reference.
Owner's Manual - Page 2
...television reception, which can radiate radio frequency energy and, if not installed and used in
to Article 82040 of the National Electric Code (U.S.A.). TV...within the product's enclosure that may be
determined by turning the equipment off and
The exclamation point within an...one or more of important
on a
circuit different from
LG Electronics. TO REDUCE THE RISK OF ELECTRIC SHOCK DO...
Owner's Manual - Page 3
...blades
and a third grounding
prong, The wide blade
or the third prong
are provided ...
instructions.
4
Do not install near water.
6
Protect the power cord from
being walked
on or pinched
particularly at
plugs, convenience
...or table specified by the
manufacturer.
3
Do not block any ventilation
openings. Follow all instructions.
1
Do not use attachments/
accessories
specified by...
Owner's Manual - Page 4
...connecting it to unplug the TV.
15
WARNING - Power Supply
Short-circuit Breaker
18
DISCONNECTING DEVICE FROM MAINS
Mains plug is , a single outlet circuit which powers only that you
turn off this unit by SWITCH...thunder or lighting storm.
12
When mounting a TV on the wall, make the TV with wet
hands. that appliances be placed upon . Check the specification page of this owner's manual ...
Owner's Manual - Page 5
... unit, size of grounding conductors, location of current to carry larger TVs. When watching the TV for a
long period, the ventilation openings
may become hot.
25
If you 're viewing the TV. Do not cover the product with cloth or other electric light or power circuits, or where it .
27
Keep the sunlight. This noise...
Owner's Manual - Page 6
...USB Connection 22 Audio Out Connection 23 PC Setup 24
WATCHING TV/ CHANNEL CONTROL
Remote Control Functions 26 Turning on the TV 28 Channel Selection 28 Volume Adjustment 28 Initial Setting 29
MENU...38 Input Menu 40 USB Menu 41
APPENDIX
Troubleshooting 43 Maintenance 45 Product Specifications 46 Open Source License 47
6 Disposal of this product must be carried out in this product ...
Owner's Manual - Page 8
.... If an accessory is missing, please contact the dealer where you purchased the TV. Owner's Manual
CD Manual
1.5V 1.5V
Remote Control, Batteries (AAA)
Polishing Cloth
Power cable
(M4 x 6) Stand screws
Option Extras
When using the VGA (D-sub 15 pin cable) PC connection, the user must use shielded signal interface cables with your...
Owner's Manual - Page 13
... fall , leading to the TV.
a Do not use screws that do not comply
a Standard dimensions for TV damage or personal injury when ... the TV or cause the TV to a fall and result in personal injury due to electric shock.
13 a LG is not...B
Standard Screw
Quantity
32LD400, 42LD400
200 * 200
M6
4
47LD500
400 * 200
M6
4
NOTE
a Screw length needed depends on . LG is used . with the VESA...
Owner's Manual - Page 17
...Component input source on the TV using the INPUT button on the TV.
Component Connection
1.
How to use
DVI AUDIO
Y
PB PR
VIDEO
AUDIO
AUDIO OUT
r Turn on the digital set-top...TV.
/ DVI IN
RGB IN
RGB (PC) AUDIO 1
AV IN VIDEO AUDIO
ANTENNA/ CABLE IN
OPTICAL DIGITAL AUDIO OUT
COMPONENT IN 2
2. How to
the COMPONENT IN VIDEO jack
on the remote control. r The pictures in any power...
Owner's Manual - Page 26
Turns the TV on the TV. Changes the aspect ratio. POWER
TV
INPUT
1
PICTURE SOUND SAP RATIO
123
456
2 789
-
0
FLASHBK
FAV
VOL CC CH 3
MUTE
Q.MENU MENU RETURN
ENTER 4
WATCHING TV / CHANNEL CONTROL
Group No. Changes the sound mode. Used to standby.
Selects MTS sound. Changes the picture mode. Tunes to the last TV channel. Rotates through...
Owner's Manual - Page 28
... a channel number.
NOTE
a If you want to turn TV on, press the POWER button.
2 Select the viewing source by pressing the MUTE or VOLUME button.
28
The TV reverts to standby mode.
At this moment, the TV switches to standby mode. WATCHING TV / CHANNEL CONTROL
Turning on the TV
1 First, connect power cord correctly. Channel Selection
1 Press the CHANNEL...
Owner's Manual - Page 29
... Setting Mode option.
It can adjust Picture quality accordingly through Picture Mode menu option.
You can also be displayed on the screen when turning the TV on for Year, Month, Date, Hour, Minute.
2
Select Time Zone option.
3
Select Daylight Saving option.
After all settings are
4 ENTER completed, press the ENTER
button.
29
In...
Owner's Manual - Page 34
... displayed on your TV.
a Energy Saving r It reduces the TV's power consumption by adjusting the Energy Saving level. r Backlight feature will turn off , the screen will turn on the screen ...- r You can use a preset, change each setting manually. ENTER
4 RETURN Return to TV viewing. You can select a different aspect ratio depending on ambient room light and personal preferences....
Owner's Manual - Page 36
...menu.
3
Set the setting. r This function operates only if the current time has been set the TV turn off .
ENTER
4 RETURN Return to work.
r If you wish to adjust the time setting, set ... Off Time On Time Sleep Timer Auto Sleep
Move
Enter
Off : Off : Off : On
Auto
Year Month Date Hour Minute
Time Zone Daylight Saving
-------- r With Auto setting, the time is wrong, reset the ...
Owner's Manual - Page 38
... ADJUSTMENTS
a Caption r Captions are provided to memorize the caption/text mode which was last set when you turned the power off.
LOCK
Move
Enter
Lock System
: Off
Set Password
Block Channel
Movie Rating
TV Rating-Children
TV Rating-General
Downloadable Rating
Input Block
LOCK
Move
Enter
Lock System
: Off
Off
Set Password
On
Block...
Owner's Manual - Page 43
...any function to see if there is weak, reorient antenna to -).
TV turns off automatically in 10
minutes. r Check the power control settings. r Try another channel.
Horizontal/vertical bars or picture shaking
r Check for sources of the picture.
APPENDIX
Troubleshooting
Abnormal Operation
r Check to restore the brightness of possible interference.
43 r If there is...
Owner's Manual - Page 45
... damage from lightning or power surges. Wring the cloth until it's almost dry, and then use a wet cloth. Cleaning the Cabinet
r To remove dirt or dust, wipe the cabinet with a soft, dry, lint-free cloth. Wet a soft cloth in a mixture of time you expect to turn on your TV dormant for a while.
Caution...
Owner's Manual - Page 46
... x 22.2" x 8.3")
791 x 506 x 83mm (31.1" x 19.9" x 3.3")
9.5 kg (20.9 lb)
8 kg (17.6 lb)
42LD400 (42LD400-UA) 1018.5 x 693 x
246mm (40.1" x 27.3" x 9.7")
1018.5 x 632 x 92mm
(40.1" x 24.9" x 3.6")
15.6 kg... x 27.5" x 3.5")
18.2 kg (40.1 lb)
15.9 kg (35 lb)
Power requirement
AC 100-240 V ~50/60 Hz
Television System Program Coverage External Antenna Impedance
NTSC-M, ATSC, 64 & 256 QAM
VHF 2-13, ...
Specification - Page 1
LCD TV
42LD400
42" Class
42.0" diagonal
HIGHLIGHTS Full HD 1080p Resolution 100,000:1 Dynamic Contrast Ratio USB 2.0
FEATURES
•... of your external USB devices to watch videos, enjoy JPEG photos or listen to MP3 files. Now reliving that make LG TVs something better? Easily connect your living room. Get 10.2Gbps of bandwidth for tomorrow's technology today. This stunning picture is...
Specification - Page 2
...WxH)
• (200mm x 200mm)
Remote Control 1 (Unified)
Power
Voltage, Hz
100V ~ 240V, 50/60Hz
On Mode (Average)...Lock
•
Closed Caption
•
LGusa.com
LG Electronics U.S.A., Inc.
1000 Sylvan Avenue Englewood Cliffs...; 1.3/HDCP Input
2 (rear)
RGB In (D-Sub 15pin) - LCD TV
42LD400
PANEL SPECIFICATION
Screen Size
42" Class (42.0" diagonal)
Resolution 1920 x...
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