20 Most Recent LG 42LB1DRA 42 in. LCD Television - Page 4 Questions & Answers

I purchased four 2200uf @ 25v capacitor’s for $8 at that same repair shop. I upgraded to 25v because these will run cooler. The tv came with 10v Samxon caps that seem to be problematic in all the units they were used in. Do not buy Samxon if you do this yourself.... I opened the set by taking off the plastic back panel and then by removing the second metal panel. There are three boards and a hard drive. The board on the far left just above where the plug goes in is the power supply board. There are five data cables and one red power cable attached to it that can be removed simply by unplugging them. The board is fastened to the unit with five small screws, one on each corner and one in the middle of the right side. If you look for three green capacitors grouped together around the middle of the board and slightly off to the right, you will probably see one that is bulging out at the top. This is most likely "C235", the main problem. The other three caps that need replacing are C202, C201 and C219. C219 is closer to the top part of the board.....
The process to replace is simple, believe it or not, and it could save you hundreds of dollars. 1, Go to RadioShack and buy a cheap soldering iron and a small roll of solder. 2, Buy four, 2200uf @ 25v capacitors, online or at an electronics store. 3, Plug the soldering iron in and let it heat up. 4, Locate C235 on the back side of the board and mark the negative terminal with a felt tip marker (you want to make sure that you put the negative terminal on the capacitor through the right hole, otherwise you will pop the cap. The negative terminal is clearly marker on all the capacitors). 5, With needle nose pliers, grip the cap and pull down while heating up the terminals. The cap will eventually come out. 6, Put the new cap in (you may need to heat the solder that is left on the board to clear the hole so it can push through). 6, When both terminals are through, bend them slightly so it stays in place. Take the solder and stretch out a few inches off the roll and while holding it in one hand, lightly touch the base of the terminal where it comes through the board, with the soldering iron and the solder at the same time. --- Try not to use too much solder.. you only need a tiny drop. This will solder the cap in place. 7, cut off the terminals close to the board with some snips and repeat this on the other three. 8, put the board back in, plug in the cables. Test the TV before putting the back panels on. It should work fine if all went well..... If you hear a pop than you reversed the terminals on a capacitor and that one will need to be redone correctly.... This might sound lengthy and potentially difficult but its worth a try. Otherwise you can pay someone to replace the entire board for BIG BUCKS with the same junk caps on it and have the same problem in a year or so. LG doesn’t want to take responsibility for this and I'm sure that it has cost a lot of people a lot of money for about $8 in parts........... This worked for me and it can work for anybody with the same problem.. Good Luck!

I had mine for 2 years and the main board went out. Cost 650 dollars to fix. Its been less than a yr and a half and it went out again. Selling it on ebay for parts...

It means that the main board did not send the signal to thrn off the 24vdc in the power supply section and at the backlight inverter board. It may get to the point that it will not turn off at all. Try unplugging it for an hour to let main board reset itself, if it still does it, then you may have to get new main board.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make a kit for you.

Hello,

A blown fuse is a very common type of fault due to poor design very often triggered by power surges due to outages or lightning storms. However, the most likely parts to short are easily tested, usually in-circuit, with an ohmmeter and then easily removed to confirm.

Note that it *may be* useful to replace a fuse the *first* time it blows (though it would be better to do some basic checks for shorted components first as there is a small chance that having a fuse blow the second time could result in additional damage which would further complicate the troubleshooting process). However, if the new one blows, there is a real problem meaning that your power Power supply board just die.It can be dead at anytimes.Tries websites Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
Hope this work...

Five capacitors (green) on the power board may be the source of your problem. If they are high centered then you may need to repace them. Usually it will be only 2 or three but I would replace all that are swollen. The cost of the capacitors is very low. The expensive part is having a specialist do it. If you feel up to it, learn how to disassemble the back but photograph every step, even all the cable connections before dissambling. Tape & mark all your screws and connections. I took different colored indelible pens to mark the connections to make sure I got them connected correctly. My TV works well except that now I have to figure out why it comes on by itself. I need help with this problem.

I have the same TV. Just take a deep breath and listen. My TV stopped so I did much research and came to the conclusion that there are 5 capacitors that were causing the problem. I did it myself for $15.00. I don't want to tell you how to do it because of liability. Do a lot of research on the internet and also LG will send you schematics on the internet. I am currently having a problem of my TV coming on at random times, so I am now in the process of figuring that one out. Don't be discouraged. I like my TV. Sometimes these things can be frustrating but remember when it was so much simpler. No need to cuss and get angry. God bless you and good researching.

The problem can be in the bcaklight inverter board or the main power supply is not supplying the power to the inverter board. The main power supply gets the turn on signal from the control/main board.

It can be METRIC M5 or M6, when you buy wall mount brackrt, the kit will come with mounting screws to attach the TV to the brackets.

Does it happen on all inputs? Meaning does it happen with TV, DVDs, Games or anything else you have attached? Do you see the volume indicator going up on the screen? If you dont touch it will it just keep continuing to rise until it's extremely loud?

What is the make / model of the TV?

Thanks
Tim

I just got of the phone with a manager at LG and they want to send out a technician to figure out the problem. I made it more than clear that their are more than just a handful of us experiencing this problem, and they are "looking into it".

I think we all need to call in and complain, and drive the fact home that this is not a single incident, but that there are many of us having this problem. Point them to this forum, and tell them your faith in LG is waning. A threat of informing the Better Business Bureau never hurt either. That's what I did, and now they are looking into it more, and are going to cover the parts on the service call, so that my expense for their problem is covered, even though my warranty is expired.

If we want this fixed, and prevented in the future, we have to call and *****, that is the bottom line. It is unfortunate, but that is how it has to work sometimes.

Here is the number for their customer service: 800-243-0000

If you hear anything new, let us know!

[email protected]

There is 4 capacitors on the power board that need to be replaced. I have fixed 2 of these in the past now, with the same problem. They are green in color.

Please see here:

http://www.fixya.com/support/t612191-removing_stand_from_flat_panel_tv

Is there a sound when watching from DVD or the likes?

Just make sure you keep the values the same. Don't use underated caps and yes change those 4 caps. If you keep the same rating the caps should be the same size. Nichicon has always been a sorry cap. Try to get different brands if possible.

not just lg i service all brands and this is a common thing they are cokking these parts
these set get really hot

check the 24 volts on the inverter pcb.if you
have this voltage then your panel is defective.this is dc 24 volts.

Just replace capacitors

Mainboard damaged and need to be replaced, try EBAY for a general picture of prices but you will need your product code wich is located in the back of the TV next to serial number.

replace mainboard

Please note that some models require a Video signal for them to turn on first. (Any kind of video signal - cable, DVD,VCR, etc). I would check for this first. As for the reset button, I dont think there is one, but I could be wrong. Please try the following steps:

1. Try this - hold the menu button down for 10 seconds. TV should power up; you will have to turn off front panel buttons on menu.

2. You can also try a hard reset: Unplug the TV from the AC socket and remove all cabling, wait about 30 minutes and reconnect cables and power.




3. Powering down the set or putting it in standby may have allowed the power supply to cool. Weak capacitors often go out of spec when they cool, thus preventing a section of the power supply from firing up properly again. There is a simple trick...just warm the back of the TV with a hair dryer for 5-7 mins after you have unplugged the TV. Look for the little areas of holes in the back panel of TV. Use these as your guide at where to use the hairdryer, but don't hold the dryer too close (say 5-6inches away). (Make sure the dryer is on High heat). If the TV doesn't turn on after you have heated it up (like it tries to come on but then turns off) you need to unplug the TV again, this resets it. And repeat those steps till it works. Resetting the TV after it fails to turn on is the key. Also, just leave the TV on. Don't turn in off. Since it is LCD, it doesn't take much power...only a few bucks extra a month for your utility bill.

4. A circuit board may crack about some of the larger components mounted on it. You can inspect the PCB's for fractures, and then repair them. It may also be poor soldering that has failed. I would be checking for these things first.

5. If you want to go in for a long term solution, you can easily replace the whole power board or just change the faulty capacitors. You will have to open the back panel and take a look. You can make out which are faulty, because their caps will be swollen on top. Here's a sample pic of a bust capacitor (not same model):

Check the specifications of the faulty capacitors, and get the replacements from your local electronics shop. If you are comfortable with this, you can use a pair of needle nose pliers to G-E-N-T-L-Y pull out the defunct capacitors. Once that is done, solder in the new capacitors carefully. If are unsure how to do this, try to get a friend who knows how to do this kinda stuff do it for you, or get a qualified technician. Warning: If you do not have a background in electronics repair, or are inexperienced, get a qualified technician to do it for you.

REMEMBER there are very dangerous voltages inside a TV that can KILL. Be sure to work SAFE when dealing with electricity. DISCONNECT THE POWER BEFORE YOU DO ANYTHING.

Hope that helps!

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IrishDruid