Question about LG 42LC2D 42 in. LCD HDTV

1 Answer

Hello i have an LG 50PG6010 and the screen is completely black, i have check the capacitors inside and the voltage from the power board, everything looks ok, what board should be faulty for me to replaced ,or there is something else i can try ? Thanks

Posted by on

    RUI MOREIRA Sep 13, 2010




1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • LG Master
  • 5,389 Answers

First check your inverter. If your multimeter can read high frequency signals (~50 kHz), hold the probes about an inch above the inverter and a fraction of an inch apart. If you see a 1 or an actual value, you have a good inverter. If you see a reading near 0, the board is bad or the multimeter can't resolve the frequency. You can use an oscilloscope instead.

The backlight is another suspect part. This failure usually shows up as a gradual fading of the brightness or the on-screen image change to pink/red. With a bad backlight, you'll usually see a very dim image if you look at the TV from an inch from the screen. Block the room light from overwhelming this image (sometimes a carefully positioned flashlight will help you see something).

In some cases the video board might also fail.

In either case, you can buy a replacement inverter for $50-150 and just do a simple swap. Disconnect all of the wires (connections are similar to molex and ribbon cables in a computer) and remove board (a few screws usually). Connect the cables to the new inverter. (If you google backlight inverter replacement, you'll find videos and text descriptions.) Note the part number on the board, including the Rev number, and order the exact one ( or are good starting points). Universal inverters do exist but can result in reversed controls (up to lower the brightness). Replacing individual parts on the board is cheaper but more prone to not tracking down all of the bad parts.

If the inverter is good, then it's probably backlights themselves (several in most TVs). These are sandwiched on the perimeter of the TV (usually under some tape that holds the lamp, reflector and other parts together. You need to order by length and width and get ones for your TV size. Remove the tape, and separate the reflector (make a note of how things are put together) then you have to Dremel (or use another rotary tool) to remove the plastic to get the backlight out. (They are often molded into the frame.) Then put in the new backlight and reassemble everything. ( but for an overview: Then push the new backlights into place, reconnect the wires and close up the sandwich of tape and other parts around the screen. Then replace it in the bezel.

With a good spare backlight, you can test an inverter for condition (plug together and turn on the tv while the box is open). Similarly a good inverter can test the backlight.

I hope this helps.

Cindy Wells

Posted on Sep 13, 2010

  • Cindy Wells Sep 13, 2010

    You're welcome. The inverter failure is the most common. The video board usually only fails if a surge hit the unit (and then losing the power supply or the inputs are more likely). The backlights fail at the same rate as most fluorescent tubes - rarely but you usually see it coming.

    If these don't help, the next solutions depend on how you fixed the problem. If you replaced the whole boards, then you need to check if the new boards are good and the cables. If you were replacing just bad parts or resoldering bad connections, check if you missed a problem, shorted across the board or missed a fuse/resistor/zener diode that was blown.

    I hope this helps.

    Cindy Wells



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Why is there black screen with sound and no backlight?

Hi Melissa,

A SECTION of your main-power board (my guess) has a toasted capacitor on it (possibly an SCR... bad solder joint... or a plethora of other possibilities).

You MUST verify this number for yourself... EAY62810301

If you are inclined to tackle this yourself... take a look at my last posting ... but I only GUARANTEE if you go in carelessly... you WILL turn your device into a pile of GARBAGE (good for parts).

I was completely FLOORED to find reasonable prices at SEARS... (guaranteed fit).

AMAZON ALSO CARRIES (check out below.

Always use an ANTI-STATIC WRIST STRAP...Work safely (real pros REMOVE power (when possible))...

Good luck... (better skill)

Hi looking for information on diagnosing an lg 55ls4500 lcd tv It powers...

Feb 12, 2016 | LG 32" 5300 Series LED HDTV - 32LN5300

1 Answer

LG TV Model 32CS460 black screen power light is red, then flashes if you push the tv button.

Have you checked the output voltages on your power supply. If they are good and depending on what type of set you have it could be the logic or t-con board. Your set is in stand by mode put there because the diagnostic circuits have deteted a problem some where in the circuits and will not let it power up fully to prevent damage to other circuits. Disconnect all leads from your power board and check out put voltages. Their value is stamped on the board next to each pin, if these check good move on to a logic board( if equipped) and them to the t-con board.. I am thinking you have problems on your power board. Capacitors are the least of things that can go out on that power board.

Dec 07, 2013 | Philips 37PF7320A 37 in. HD-Ready LCD...

1 Answer

The screen goes black a few seconds after boot up. WHY?

Probably a defective component on the main power board. Check first for bad capacitors first,. A bad capacitor will be bulged out at the top and probably have oily like substance around it. Replace with exact Micro Farad value but up the working voltage from 10 to 50 WVDC depending on what the working voltage of the old one was. If it's not on the main power board then the search can get complicated. When the set is powered on it runs a self diagnostic test of all circuits. Something is telling it's not safe to power up, that's why is shuts down in a few seconds!

Jun 22, 2012 | LG Computers & Internet

1 Answer

My insignia 20inch flat screen tv & computer monitor will not turn on either. i use it for a computer monitor and it is only 6 months old. the blue light on the front stays lit but still has a black...


The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on.

All these can be checked on the power supply board.

But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like ""(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.

Good luck.

Jan 11, 2012 | Olevia LT37HVS 37 in. LCD HDTV

1 Answer

LG 50PG6010 showing blanck (just black screen) , the power led comes up and can be control by remote to standby .it blink when responding to remote but no picture.

Hi there I have an LG50PG6010 that did the same how I fixed mine was simple I took off the back then removed the board that has all your connections on it like your hdmi and scart ports hen I turned it over and only do this if you feel comfortable doing it and I did it on my cooker. I took a heat gun and heated the board I held it about an inch away from the board and did circular movements sort of like a reflow to make the solder catch again if this doesn,t work it doesn,t matter as you,ll probably need to replace this board anyway

Nov 10, 2010 | LG 42LC2D 42 in. LCD HDTV

1 Answer

No picture on the screen it is totally black and i do get sound.

There will be a problem with the backlights not being switched on, you would need to check if you are getting the supply voltage to the Inverter board (24V). If not check the power supply, if it is present then check if the backlights are functioning with a backlight tester, if these are ok check the capacitors on the inverter board. If the backlights are faulty then a replacement screen would be required.

Aug 27, 2009 | LG 50PG30 Plasma HDTV

2 Answers

Screen is black even though the green light is lit

Tv has power supply board inside defective. This board needs replaced.

Aug 18, 2009 | LG 32LB9D TV

2 Answers


HI. I had the same problem with mine. It would flash the screen on for a split second and then turn black, the whole time the power light remained green. Upon opening up the case, I pulled the combo power supply board/inverter board out for inspection. I noticed one of the capacitors had a bulge on top indicating it was bad. It was the the 680uf 25v capacitor. I desoldered it, and soldered in the new one. After hooking everything back up, bingo!! Monitor now works perfectly. I couldn't find an exact match to the capacitance locally, but I had a 1000uf 35v cap in my utility box. It worked fine as a replacement. You can usually go within 30 percent of tolerance and be alright. Just don't go under on capacitance or voltage. I hope this helps.

Nov 25, 2007 | LG Flatron L1710M 17" LCD Monitor

4 Answers

RCA DRC257N No Power

Had the same exact issue. RCA DRC257N was acting funny, frequently freezing up at HELLO screen, sometimes buttons would stop working during playback, requiring frequent unplugging to get back to working. Opened the case, pulled out the power board and noticed that capacitor C411 (1000uF 16V) was bulging out at top and bottom. Replaced with a $1.59 1000uF 35V capacitor from Radio Shack and all is back to good working order. Thanks.

Aug 17, 2007 | RCA DRC257N DVD Player

Not finding what you are looking for?
LG 42LC2D 42 in. LCD HDTV Logo

Related Topics:

634 people viewed this question

Ask a Question

Usually answered in minutes!

Top LG Televison & Video Experts

Computer Repairing
Computer Repairing

Level 3 Expert

14641 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

The Knight
The Knight

Level 3 Expert

75311 Answers

Are you a LG Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides