Question about LG 42LP1D 42 in. LCD HDTV

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Problem with new TV

My tv hums when the backlight is at any setting other than 100 percent. This problem was present when the Tv was first set up.
The product chosen isn't the actual tv that I have, my model number is 42LG30 but this webpage wouldn't let me chose that

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The back light power supply is radiating. This can be from many things. I have seen this from a poor or missing ground shield that covers the back light power supply, and or its cable harness.

Another thing that I have seen cause this type of fault are worn electrolytic capacitors in the back plain light power supply that have become high in their ESR.


Jerry G.

Posted on Jun 02, 2008

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Posted on Jan 02, 2017

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1 Answer

My sharp TV has sound but no picture?


Backlight issues are unfortunately starting to look like a common failure on most LED TV's, and I believe the reason for it is because of the factory setting of 100 on the backlight setting, those little lights aren't meant to be run that hard and if they are turned down the set would last longer but most people don't even realize there is a setting for that...you can take the panel apart if your comfortable doing that and I'm guessing you will find some shorted LEDs shutting down the power supply for them

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My lg TV of three and half years has a black screen with images flashin Intermittently. The sound is fine


What is the model number? If it is only 3 years old, I suspect you have a LCD TV with LED backlight. You quite possibly have a failed LED backlight.

Many LG TVs of this age are starting to fail due to over-worked LEDs in the backlight which create the white light that illuminates the LCD image.

The symptom is TV turns on and off ok, gets sound on the connected video inputs, but has an otherwise black screen with no video on display. You can try to operate the TV near a bright window with lots of sunlight and see if you can perceive a faint image on the screen. A flashlight is often not bright enough to be helpful.

Most of the time, an LED will fail as a short circuit and still allow power to flow through it to other LEDs that will still light up. If one of these LEDs fails as an "open circuit", or if several LEDs have failed in the same circuit, then the power supply detects a fault and shuts the TV down. If the LED is intermittent, you may have flickering. Think of having one light bulb burn out in a string of Christmas lights and having all the lights go out until the bad bulb is replaced... kind of the same thing.

Your TV circuits boards should be fine. In my opinion your TV requires a backlight repair which requires complete disassembly of the entire TV including disassembly of the panel which is a difficult process.

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Sanyo 42 inch LCD TV - Could the back light inverter be the cause of not getting any power? There is a red light on it and that is all


> Could the backlight inverter be the cause of not getting any power?

If the set uses a fluorescent backlight (many use LEDs instead) it will not prevent it from turning on so at least audio should be present.
With no backlight. you will not see any video but the set will receive and audio will work.
If you replaced the (main) power supply with a 'pull' (removed from another set) it may have failed like your original one.

Jun 25, 2015 | Sanyo Televison & Video

1 Answer

Vizio 42" LCD just quit


Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary. .....

Mar 28, 2017 | Vizio 42 in. LCD TV

1 Answer

My 6-month old tv is making intermittent 'buzzing" sounds. It was a Christmas gift and I don't have any paperwork on it but it did come from Costco. What should I do? Thanks so much.


Humming usually begins when the backlight setting is low. For some sets setting the backlight anywhere from 95 to 100 works. Most wok at 100. So turning it up should get rid of the problem. You can follow the 5 steps below to change the backlight setting.

1. Turn the TV on.
2. Press the Menu button on the remote, located right below the channel changing button.
3. Press the down direction button, located at the middle of the remote. Press that button until the backlight is highlighted.
4. Press the right direction button until the backlight is at 100.
5. Press the OK button and then the Exit button until you get back to your picture.

Jun 15, 2011 | Vizio 42 in. LCD TV

2 Answers

Got no picture only sound


Hello,
You most likely have a backlight issue with this TV set. Could be the inverter circuits for the backlights. The inverter is the power supply source for the backlights. there could also be a screen driver problem. This would entail changing the entire board. You should call in an authorized LG repair center to check this set out for you. Good Luck and please let me know what you found out about this TV set.

Jun 03, 2010 | Samsung LE26R73BDX 26 in. HD-Ready LCD...

1 Answer

How do i fix the color on my tv?? Very blue


Reset it to factory colors setting,turn colors down to -5 or 40 percent should be normal,still very blue than ur video backlight board is dying must replaced.

Dec 15, 2009 | Panasonic TC-32LX85 LCD TV

2 Answers

Hum from tv


try unplugging any equipment that you have attached to the tv one at a time, such as dvd players, surround sound, cable box, etc. also if you have a cable box attached, try adjusting the volume on it. if you have everything unplugged from tv and it still hums, then it may be a tv issue

Oct 21, 2009 | Televison & Video

11 Answers

Proscan Tv is humming


This made my humming sound go away completely;


From JD at oncorpus.com [manufacturer of the 32LB30Q]


Please follow these instructions, should fix the hum issue:

1. Turn tv on
2. Input mode should be tv
3. Turn volume to zero
4. With remote enter 9 8 7 6
5. A menu will appear on left side
6. Arrow down to backlight and with right arrow key move number from 81 to 83, press menu button twice,
7. Turn up volume and listen if hum is gone.

John

Dec 15, 2008 | Proscan 32LA30Q Television

2 Answers

Vizio 42'' HDTV flatscreen


The TV usually hums when the backlight setting is too low. So turning it up should get rid of the problem. To do this please follow these instructions:

1. Turn the TV on.
2. Press the Menu button on the remote, located right below the channel changing button.
3. Press the down direction button, located at the middle of the remote. Press that button until the backlight is highlighted.
4. Press the right direction button until the backlight is at 100.
5. Press the OK button and then the Exit button until you get back to your picture.

Oct 22, 2008 | Vizio GV42L 42 in. LCD Television

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