Question about LG 42LB1DRA 42 in. LCD Television
I have an LG 42" flat screen model num 42LB1DRA which is 1.5 years old.The other night the picture and sound went out. I have been using a cable card which seems to give me alot of problems. I was told that there is a reset button that I can try to reset the Tv with. At this point I can not even get my menu screens to come up. It does turn on and I get a dark screen but thats all I get. Is there a reset Button and where do I find it. I am being told it will cost me a min of $200 for a tech to just come out and look at it.
There are 4 bad Capacitors in this TV. LG just doesn't wnat to tell anybody......
I purchased four 2200uf @ 25v capacitor’s for $8 at a repair shop. I upgraded to 25v because these will run cooler. The tv came with four 2200uf @ 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. 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!
Posted on Apr 28, 2009
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!
If your issue is not resolved, please do not assign a rating just yet. Please post back as to what steps you took, results, etc, and I will try to assist you further as best I can. I am here at your service.
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Posted on May 31, 2008
Ok. I posted this same problem a while back and finally got the problem solved by a local TV repair man. He contacted LG who told him to replace, both the analog board and the digital boards(like about $800.00 is repair parts). Neither of these things solved the problem. Turns out it was simply the power supply. Now, I know what your thinking because I thought the same thing..."I have power and the LCD screen lights up--just no picture, sound, or even menu screens". Of course, my warranty was expired, but after escalating the issue to the LG customer support supervisor, they extended the warranty (for parts only) and faxed a copy of the extension to my repair man. Out of pocket cost for labor was $170.00. I am told that the power supply cost $220.00, so I was ok with that. TV has been working like a champ ever since. Turns out that the power supply has been an issue for a while with that TV.
Good luck and God Speed!
Posted on Feb 03, 2009
After a few months of trying to get the $$$ together to bring this to a repairman, we finally opened up the back and took a look....we don't know ANYTHING about electronics or TVs. So there were some capacitors that were swollen, and we don't know how to weld or any of that stuff, so what we did was take off the power board (big green thing) and my husband ordered another one ($156)...it came in a few days and basically screws on and then you plug it back into the wires...really easy...I did it myself! TV is working fine now, except there is a loose screw in there somewhere and it keeps rattling...I'm going to have to open it back up and find it! --Birdiegirl91
Posted on Feb 03, 2009
Problem seems to be a capacitor problem in power supply. 2200 micro farrad caps (smaller ones). also some times this takes out other componets further in. also i located a reset switch on the main pcb board it is small so youll have to look hard it is about 1/8 " in. if your not an electronic expert replace the power supply board. it is about $130 and is the expensive way of doing were the caps are about $2-$5 each x 3. trust me my company has ten of these flops so i feel your pain.
Posted on Feb 03, 2009
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