My LG TV acts as if it is turning on but just doesn’t, until several minutes later. Instead it makes a clicking noise over and over again until it eventually stops and then the TV will turn on with both picture and sound. This happened for some time and then eventually just stopped coming on completely. The TV appears to be ‘dead’. This is a fairly common problem amongst flat screen TVs and it is a common problem that has plagued several different brands.
Place the TV face flat on a working surface with a towel down or lie the TV on the floor so that you don’t damage the actual screen. Unscrew the back panel and that will reveal the inner workings of the TV. You should see the back of the screen and a couple of fairly small circuit boards. 9 times out of 10 the root cause of the problem is simply a defective capacitor or two. The capacitors are usually cylindrical, radial-leaded electrolytic mounted on the power supply board. Regardless of what board it is on, take a close look at each of the capacitors and they should be flat headed usually with cross like indentation on the top surface. When the TV fails in the fashion mentioned above, these capacitors will have a domed or bulging look at the top. If you spot a bulging capacitor these need replaced. You have two options, replace the entire board or replace the defective capacitors. If you are going down the replacement board option, then you will need to know exactly what one you need. The part number is usually on a sticker somewhere on the board, but likely to be well hidden. If there is no sticker, then consult the manual or do some searching online.
The other option and the one that I recommend due to it being relatively easier and significantly cheaper, is to replace the defective capacitors. There are other guides that I will write that details exactly how to replace capacitors but more on that soon.
The capacitors that most commonly fail are typically these two: 2200uF@10V or 1000uF@10V. You can either replace them with exactly the same capacitors or the better thing to do is to replace them with higher voltage capacitors. Namely, 25V. Although, if the defective capacitor are 25V then replacing them with just that will be what is required.
This is just one of my interests as an avid DIYer and repairing, why not check out what I do for a living: environmental consultants.