I own two of these TVs. The first TV, used more often, does not turn on correctly at all. The other, second, TV is exhibiting problems the first experienced before it stopped working completely. What happens is, when I turn on this TV without any input going in, it turns on fine. But as soon as I say, turn on my cable box, it begins turning on and off and making a very loud static noise, and there's static and distorted images on the screen. It does this for a while, cycling on and off, until it finally stabilizes and remains on and functions normally. It seems to need a moment to "warm up". The first TV has stopped functioning after a while of this, and the second TV is degrading in much the same way, requiring more and more restarts before stabilizing. I did a bit of research, and it seems to be a popular problem where TVs are turning on and off, and the PSU is at issue. But I think my problem might be slightly different since it doesn't happening until there's an input, so I suspect it might be an issue with the main tuner board. I want to know how I can fix this issue. Thank you.
Needs repairs take it to you local repairer
SOURCE: Screen goes completely out.
when it blanks out, tuen the lights out in the room, and shine a flash light at the screen, see if you can see the picture, if you can, it is the inverter moard blamking out, thats the board that lights the back lights, if you cant, hit the input button on the remote, if the TV comes back with a picture, it is a problem with the main board, in paticular the componant input on the main board
SOURCE: Astar LTV-32ASB turns on then picture goes out & sound remains on
Symptoms of a Defective or dying Power supplies on LCD TVs.
1. Light(s) on the front panel are behaving not normal example, blinking, amber color or not steady, fainting, etc.
2. TV not turning ON properly.
3. TV turns OFF by itself.
4. Needs to be unplug to many times to make it work.
5. Humming or high pitch noise heard through speakers or at the back of the TV.
I repair these power supplies. Write to [email protected] if you require further assistance.
SOURCE: LG 37LC7D
Howard,
Do not keep forcing this unit on - - This particular unit has a VERY commonly known problem and there are at least five tech bulletins from LG explaining this and other symptoms for the failure. In a nutshell there are coils that have to be removed and replaced with a jumper wire. This is not a repair you want to tackle so please get some experienced help for this one. A good technician will look-up the bulletins and educate themselves on the manner of the repair.
Almost all of the symptoms that can happen are intermittent and can be extremely difficult to verify. For this reason make sure to discuss with the technician that he replace all of the coils listed in the bulletin not just the ones causing your particular problem. Here's a list of symptoms that these defective coils cause, taken right from the bulletin:
1. Channels Or Menu Functions Scroll On Their Own
2. Remote Does Not Function
3. Tv Randomly Powers On And Off On Its Own
4. Dead
5. No Backlight
Hope this helps!
William Rayburn, CET
Premium Technologies
SOURCE: Tv cycles on and off repeatedly while plugged in.
Samsung caps
http://www.avforums.com/forums/attachments/lcd-televisions/128595d1247354171-samsung-40-lcd-one-year-old-beyond-repair-caps.jpg
Above should be a link to a picture of the caps if not google " Samsung power supply caps" and look for other images.
Hope this helps
Once the back cover is removed the caps are obvious to spot (especially with that picture I forwarded) you need to label and remove all the plugs - unscrew the board from the chassis so you can get to the solder side of the board.
Once there all that is required is to observe how the caps are placed in - and + side of caps and unsolder the old caps 10V 1000Uf and replace with new ones of higher value 16V 1000Uf
If your feeling adventurous do it yourself otherwise get quote from a reputable shop.
Also google "Samsung power supply capacitor replacement" and there may be step-by-step instructions with pix.
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