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New Member
Posts: 1
Registered: ‎07-27-2016

Re: Insignia 42" lcd 120HZ loses picture not sound.

I have a 55" lcd insignia tv that the screen does not work on. You can see the image barely with a flashlight so according to what I keep seeing online, it sounds like the backlight inverter? But I can't figure out where the backlight inverter is in the tv. I took the tv back off and there is the main power supply board, the tcon board and then the board where you have all the ports. That's it, so I'm trying to figure out how you replace whatever is necessary to fix the backlight problem? Help!!
Posts: 11,642
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Registered: ‎09-29-2008

Re: Insignia 42" lcd 120HZ loses picture not sound.

Hey slpick86,

 

I am not a technician, which means I would be clueless as to how to repair this TV. We might sell this part on The Part Store, but I still wouldn't be able to advise you how to install it into the TV. For tech support you could try posting this to Insignia's forum here. We do repair TVs, and if you want to look into getting the TV repaired by a TV repair technician you can look into your options here.

 

Thanks,

Allan|Senior Social Media Specialist | Best Buy® Corporate
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New Member
Posts: 11
Registered: ‎10-30-2015

Re: Insignia 42" lcd 120HZ loses picture not sound.

If its an LED /LCD  there is no baclight inverter like an old CCFL/LCD  TV set and you have a bad conecction or LED circiut, ,LED driver board or LED strip  circiut wireing or an faulty  12V power rail . . all simple to diag with a DVM 

Not sent from my Best Buy 2015 4K HDR ready Sony XBR X850C or the other 4 Best Buy TV's here but instead Windows 10 14393.rs1
New Member
Posts: 11
Registered: ‎10-30-2015

Re: Insignia 42" lcd 120HZ loses picture not sound.

^^^^ oh........ some of the baclight/edgelight LED driver boards are integral with the power supply board and all that is plausable on a 42" 

Not sent from my Best Buy 2015 4K HDR ready Sony XBR X850C or the other 4 Best Buy TV's here but instead Windows 10 14393.rs1
New Member
Posts: 6
Registered: ‎06-16-2022

Re: Insignia 42" lcd 120HZ loses picture not sound.

If you are handly you can repair this for $35 to 60 bucks.

 

Basically, It is one of three items....

 

A failed power supply board or a back backlight LED strip or

 

Both!

 

If you are handy there are lots of You Tube videos you can watch with instructions. You will need a screw driver, tape, time and confidence.

 

The easiest fix is the power supply board. They are available on line and ebay. I just fixed my 55" fire tv insignia for $35 with a new one.

 

A little more complicated is the back light LED display having a burn on the strip or short which can also cause a power supply failure. It is more work as you need to fully take the TV apart remove the bezel and unscrew the backlight strip and replace it.

 

Lastly if the short out is bad on the strip you may have a burned out strip that burned out the power supply.

 

Easy repairs and relatively cheap parts compared to a new TV. Heck you can get a kit to replace all the boards and the backlight LEDs for under $130.00 bucks!

 

Hope this is helpful. You will need to either pull up the exact model number on the back of the TV or look up the board numbers after you open up the back. 

 

As always make sure it is unplugged and remember capacitors can hold a charge for a LONG time after unplugged.

 

Good Luck!