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LG 55LH40 Support Question

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Question posted by donaldboone5 on June 24th, 2022

Tv Comes On On About 10 Seconds And Goes Back Off

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Answer #1: Posted by SonuKumar on June 24th, 2022 9:20 PM

This answer was accepted by the poster of the original question.

SonuKumar

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https://www.manualslib.com/manual/243747/Lg-55lh40.html?page=70#manual

https://www.youtube.com/watch?v=1oLvpiEgQcY

try reset, or issue with diaode failue in the motherboard power supply

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Answer #2: Posted by hzplj9 on June 25th, 2022 8:57 AM

hzplj9

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Check this Youtube video for advice on a possible solution.

www.youtube.com/watch?v=C0uCwTsY8h0

Good Luck with that.

Answer #3: Posted by Odin on June 25th, 2022 12:03 PM

Odin

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Verify that the unit is plugged into a fully working outlet. Press the power button on the unit to verify it is not a remote control issue. If it's the remote:

Pressing the remote control toward the TV should cause an LED or light on the TV front panel to flash. This indicates a code was transmitted. Verify the remote control is in TV mode. If the front panel lamp or LED does not flash, verify that the batteries are installed properly and are in good condition. Battery corrosion can cause the remote control to not function. The remote control range is 30 feet or less. A bright light behind the remote control can affect the performance of the remote control. A remote control can be tested by pointing it at a digital camera or camera phone; the transmitter will show white on the camera screen if it is transmitting.

Otherwise:

Perhaps an on/off timer or sleep timer is set.
Or remove the electrical plug from the wall outlet and wait a while before inserting it into the wall outlet again.

If the problem persists or if you require further explanation, you'll have to consult the company: use the contact information at https://www.contacthelp.com/lg.

Hope this is useful. Please don't forget to click the Accept This Answer button if you do accept it. My aim is to provide reliable helpful answers, not just a lot of them. See https://www.helpowl.com/profile/Odin.

Related LG 55LH40 Manual Pages

Specification (English) - Page 1

...8226; Picture Wizard • AV Mode II (Cinema, Sports, Game) • 60,000 Hour Panel Life (typical) • NTSC/ATSC Tuners with Clear QAM AUDIO • Output Power: 10W ...• PC Connectivity (D-sub 15pin) • RF Antenna Input LGusa.com LCD TV 55LH40 55" Class Full HD 1080p 120Hz LCD TV (54.6" diagonal) Full HD 1080p performance, a robust feature set and Smart Energy Savings make the...

Specification (English) - Page 2

THD 10%) 10W + 10W Invisible Speaker System Details 2 Way 4 Speaker Dolby Digital 5.1 Decoder &#...1080p/1080i/720p - Non-metric weights and messurements are the property of LG Corp. LCD TV 55LH40 55" Class Full HD 1080p 120Hz LCD TV (54.6" diagonal) LGusa.com LCD SPECIFICATION Screen Size (Class) 55" Class (54.6" diagonal) Native Display Resolution 1920 x 1080p Brightness (cd...

Owner's Manual (English) - Page 1

LCD TV OWNER'S MANUAL 32LH40 37LH40 42LH40 47LH40 55LH40 32LH41 37LH41 42LH41 47LH41 55LH41 37LH55 42LH55 47LH55 55LH55 32CL40 42CL40 47CL40 55LH400C... USA, Consumer User 1-888-865-3026 USA, Commercial User 1-888-542-2623 CANADA LG Customer Information Center P/NO : SAC33601903 (0910-REV04) www.lgusa.com / www.lg.ca Record it for ENERGY STAR in the "factory default (Home Use)" setting.

Owner's Manual (English) - Page 5

...space such as death or serious injury can come in wire to an antenna discharge unit, size of grounding conductors, location of the TV. 23 Ventilation Install your finger(s) against voltage ... front panel of antenna discharge unit, connection to touch the ventilation open- Disposal of this product contains a small amount of time. Avoid touching the LCD screen or holding your TV where ...

Owner's Manual (English) - Page 6

CONTENTS WARNING / CAUTION 2 SAFETY INSTRUCTIONS 3 FEATURE OF THIS TV 8 PREPARATION Accessories 9 Front Panel Information 10 Back Panel Information 12 Stand Instruction 14 VESA Wall Mounting 18 Cable Management 19 Desktop Pedestal Installation 21 Swivel Stand 21 Attaching the TV to a Desk 22 Kensington Security System 22 Securing the TV to the wall to prevent falling when the...

Owner's Manual (English) - Page 8

...panel provides clearer, smoother images, even during fast action scenes creating a more stable structure for a more detailed picture. logos, screen menus, video game, and computer display) is displayed on the TV... of your TV screen for a prolonged period (2 or more hours for LCD, 1 or...OF THIS TV High-definition television. Detailed calibration requires a licensed technician. LG TV include a...

Owner's Manual (English) - Page 10

PREPARATION PREPARATION FRONT PANEL INFORMATION I Image shown may differ from your TV. 32/37/42/47/55LH40, 32/37/42/47/55LH41, 37/42/47/55LH55, 55LH400C SPEAKER Remote Control Sensor... VOLUME (+, -) Buttons ENTER Button MENU Button INPUT Button POWER Button OFF ON AC power control switch 10 Illuminates blue when the TV is switched on. (Can be adjusted Power Indicator in standby mode.

Owner's Manual (English) - Page 45

... Current Time Setting Month Date Year Hour Minute Time Zone Daylight Saving F Auto G 02 21 2009 10 AM 10 Eastern Auto Previous Next 1 Select Auto or Manual. 2 ENTER Select desired time option. We recommend setting the TV to "Home Use" mode for displaying at Store, select [Store Demo]. I "Store Demo" Mode is connected...

Owner's Manual (English) - Page 53

... title 2 Day, Month, Year 3 Program start time 4 Program progress bar 5 Program finish time 6 Present time 7 Banner information 53 Sat, Feb 21, 2009 10:10 AM Multilingual D CC Caption 11:40 AM 1080i TV-PG D L S V 10:40 AM WATCHING TV / CHANNEL CONTROL Multilingual : The program contains two or more caption services. Use the Q.MENU menu to...

Owner's Manual (English) - Page 71

...Wizard. Vertical Sharpness Set the screen above identical to the Recommended sample below . DTV TV AV1 AV2 Component1 Component2 RGB-PC HDMI1 HDMI2 HDMI3 HDMI4 Warning: The picture quality may.... I If you stop the setting before the final step, the changes will not be saved to the TV. i The current adjustment value is changed to O f f automatically. 71 I Once the Picture Wizard sets...

Owner's Manual (English) - Page 76

...Black Level Low: The reflection of the picture darker. Auto: Realizing the black level of a second producing 48 fps without compromising video quality. High: Provides smoother picture movement. I TruMotion works with ... to the brightness of the screen to prevent the screen from being too bright. With LG Real Cinema, every frame is disabled in 1/24 of the picture. Medium: Express original...

Owner's Manual (English) - Page 78

...• Brightness • Sharpness E 70Auto 90Off 50Minimum 70Medium Maximum Screen off after 3 seconds. Return to TV viewing. I When selecting A u t o, Backlight is adjusted to the comfortable level to... the Energy Saving level or by lowering the backlight level. I When selecting Screen off, TV turned off 1 MENU Select PICTURE. 2 ENTER Select Energy Saving. 3 ENTER 4 RETURN ...

Owner's Manual (English) - Page 95

... G 02 21 2009 Hour Minute 10 AM 10 Time Zone Daylight Saving Eastern Auto... Close 1 MENU Select T IM E. 2 ENTER Select Clock. 3 ENTER Select Auto. 4 5 6 RETURN Select your viewing area observes Daylight Saving time). The digital channel signal includes information for the current time provided by the auto clock function. Return to TV...

Owner's Manual (English) - Page 96

... once or turn off with the AC power control switch on the TV, reset the Clock function. MENU Return to the previous menu. If this TV is wrong, reset the clock manually. TIME Clock Off Time On... Time Sleep Timer Move : Off : Off : Off Enter F Month Date Year Manual G 02 21 2009 Hour Minute 10 AM 10 Time Zone...

Owner's Manual (English) - Page 98

Make appropriate adjustments. 4 RETURN Return to TV viewing. I M E. 2 ENTER 3 ENTER Select Sleep Timer. TIME Clock Off Time On Time Sleep Timer Move Enter : Off : Off : Off TIME Clock Off Time On Time Sleep Timer Move Enter : Off : Off : Off Off 10 min. 20 min. 30 min. 60 min. 90 min. 120 min. 180...

Owner's Manual (English) - Page 115

IR CODES Code (Hexa) 08 45 43 0B 10-19 4C 1A 09 02 03 00 01 1E 40 41 07 06 44 28 79 0E 95 7E AA 30 ... control Button 77 YELLOW (G) Remote control Button BLUE (l l) Remote control Button AF FF Remote control Button GG Remote control Button Function Note TV POWER ON POWER OFF AV1 AV2 COMPONENT1 COMPONENT2 RGB-PC HDMI1 HDMI2 HDMI3 HDMI4 Ratio 4:3 Ratio 16:9 Ratio Zoom Discrete IR Code...

Owner's Manual (English) - Page 117

... 0 : Step 0 A : Step 10 (SET ID 10) F : Step 15 (SET ID 15) 10 : Step 16 (SET ID 16) 63 : Step 99 (SET ID 99) 64 : Step 100 117 Return to TV viewing. The adjustment range of Set ID...menu. RS-232C Configurations Either cable below can be used. 7-Wire Configuration (Serial female-female NULL modem cable) PC TV RXD 2 TXD 3 GND 5 DTR 4 DSR 6 RTS 7 CTS 8 3 TXD 2 RXD 5 GND 6 ...

Owner's Manual (English) - Page 118

...to control the set.(j, k, m or x) [Command 2] : Second command to control the set. [Set ID] : You can adjust the set ID is 10, it will send the 'a', 'b'. [NG] : Use the ... non-viable functions or communication errors. Error Acknowledgement [Command2][ ][Set ID][ ][NG][Data][x] The TV transmits ACK (acknowledgement) based on transmission /receiving protocol. [DATA] : To transmit the command data...

Owner's Manual (English) - Page 119

...10: Video-out Mute on Acknowledgement [d][ ][Set ID][ ][OK/NG][Data][x] * In case of Video-out Mute on only, TV will send the Acknowledge after power on this format, Acknowledgement data feedback presents status about each function. * Note: In this model, TV...Set ID][ ][Data][Cr] Data 01: 4:3 09: Just scan 02: 16:9 10: Cinema Zoom1 04: Zoom 06: Set by Hexadecimal code) *Refer to 'Real data...

Owner's Manual (English) - Page 120

... you're not using the remote control and front panel controls on by Hexadecimal code) *Refer to 'Real...digital channel number, the Major is used. off Data 01: OSD on the TV. 14. Transmission [m][a][ ][Set ID][ ][Data00][ ][Data01] [ ][Data02][ ][... Number Not needed for the Major and Minor, normally only the second byte is the number that the channel should be mapped to 'Real...

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