Question about LG 42LD520 42 in. HD-Ready LCD TV

Open Question

LG 42LD520 LCD TV Clicking on and off on its own.

I have an LG 42LD520 LCD TV. Over the last few months, it was clicking off and on. It's now permanently off. I opened it up. The capacitors are not swollen. I'm thinking about replacing the power supply. Is that the right fix?

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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

Hi,
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.
goodluck!

Posted on Jan 02, 2017

  • 83 Answers

SOURCE: Power supply unit, TV cuts off after 20 seconds

i would recommend ebay, they usually have lots of parts for lcd tvs

Posted on Jan 25, 2009

  • 8457 Answers

SOURCE: LG M4201C 42" will not power on.

Power supply board is dead.Must change the power supply board.Tries shopjimmy.com,Ebay.com for the part.

Posted on Jan 23, 2010

  • 222 Answers

SOURCE: Need a new power supply. Where?

Try E-bay

Posted on Jun 06, 2010

Testimonial: "THanks."

SuperTech-11
  • 1591 Answers

SOURCE: Failed Repair Job. A friend of mine called a

replacing the 10V caps with 25V caps is perfectly fine. In fact, if it was manufactured like that, those caps may not have blown.
Replacing a 680uF with a 1000uF could be problematic depending on it's function.
680uF is pretty specific when 500uF and 1000uF are much more common and therefore cheaper - one would think that the engineers would have tried using those in the design rather than a 680uF - makes me think the value of the cap is important to the frequency of the circuit it's in.
Other concerns might be whether he got any of them in backwards or not.
That's a rookie mistake, but still an easy enough one to make (for a rookie).
Also, with that many swollen caps, I wonder if there were any that leaked out the bottom before swelling at the top (IE - if some caps were missed in the replacement procedure)
Also, with that large a number of caps gone, other components may have been compromised or blown.
I'd be testing the transistors around those caps (most likely punched through rather than open), looking for fusible links (surface mount fuses, 0 OHM resistors) that may have opened up etc.
The initial attack on the problem was basically correct, and in many cases probably would have fixed it (if say the 680uF cap was functioning as a ripple filter).
But when that didn't fix it, a deeper analysis should have been done to complete the repair (including locating a 680uF cap).

Posted on Feb 27, 2011

Testimonial: "Excellent and through description of recommendations."

walesarumi
  • 6993 Answers

SOURCE: LG 42PJ350 tv, will not power up, just clicks

Hello,

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 "mcmelectronics.com"(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.

Posted on Jan 12, 2012

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Lg 42ld520 clicking on and off


hi, capacitors don't have to be swollen to be faulty, i would test them first, use a esr meter if you have one, or use a meter with capacitance test on it or might be best to look for tech in your area hope it helps

regards
shaun

Apr 19, 2014 | Televison & Video

1 Answer

How to connect LG 42LD520 to wifi


get the wifi access code and input into the wifi client of the tv.

heres the manual

http://www.lg.com/us/support-product/lg-42LD520

Apr 15, 2013 | LG 42LD520 42 in. HD-Ready LCD TV

1 Answer

Black line lg tv


You have a bad panel. Will be cheaper to buy a new TV than to replace panel.

May 02, 2012 | LG 42LD520 42 in. HD-Ready LCD TV

1 Answer

42LD520 sound shorts out


if it has a headphone jack it could cause this--the jack when inserted cuts off the speakers to engage a headphone--try inserting a jack when it does this and wiggle it a little--jack socket has leaf contacts that can be out of position

If tapping it could also be a bad solder connection somewhere.

Apr 08, 2012 | LG 42LD520 42 in. HD-Ready LCD TV

1 Answer

Sound goes up and down


Sounds like a dry joint or a capacitor has broken down, you will need to take back off and check, just remember there is 240volts in the PSU of the system.

Jan 27, 2012 | LG 42LD520 42 in. HD-Ready LCD TV

1 Answer

Lg 42ld520 red light comes on and blinks a few times then the blue light comes on and nothing happens no picture or sound


These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.

Sep 27, 2011 | LG 42LD520 42 in. HD-Ready LCD TV

1 Answer

I have an LG 42LD520-UA and it doesnt do anything no lights nothing just wont turn on


AC out is good? Otherwise check the main AC fuse on the power supply module, see picture here:
http://assets.shopjimmy.com/media/catalog/product/cache/1/image/5e06319eda06f020e43594a9c230972d/s/j/sjeay60990201.jpg

The fuse is located on the top right (white cylinder with red band), the fuse is soldered in.

Parts for your TV;
http://www.shopjimmy.com/catalogsearch/result/?q=LG+42LD520-UA

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: www.interliquidparts.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.

Sep 14, 2011 | LG 42LD520 42 in. HD-Ready LCD TV

1 Answer

I have been watching my LG 42LD520 for 2 months. Today turned it on and there is no sound. Any ideas??


If you are using a satelite system...just unplug the satelite receiver for 30 seconds and plug back up. Try unpluging the TV and check for the mute function...it may be off. Also go to the sound menu in the TV and be sure the speakers are on. The worst problem is a main signal board.

May 28, 2011 | LG 42LD520 42 in. HD-Ready LCD TV

Not finding what you are looking for?
LG 42LD520 42 in. HD-Ready LCD TV Logo

Related Topics:

29 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

The Knight
The Knight

Level 3 Expert

73665 Answers

Les Dickinson
Les Dickinson

Level 3 Expert

18389 Answers

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

Answer questions

Manuals & User Guides

Loading...