**EDIT by mod** The information in the original thread pertains to many different Samsung models, lets keep it all in one place as a reference. Merged. --SpotTheCat
This thread is similar to and based on my successful fix using the info from the Tech Report thread http://techreport.com/forums/viewtopic.php?f=37&t=62360
The information and pictures here are for the Samsung 46 inch LCD TV LNT4669F. I used the information in the above thread and had a successful fix thanks to photos and info from billne and zazik. Thanks folks!
Problem: When powering my TV on, the TV would click and cycle over and over. After progressively longer cycles it would eventually turn on, however, according to other posters, I was concerned that it could actually kill the screen and/or fail to come on at all. Based on the information gained in this forum, I checked the capacitors on my motherboard and sure enough, I found 2 10Volt capacitors had bubbled and were leaking electrolyte fluid (black in color). Evidently, Samsung installed under voltage capacitors on their LCD TVS manufactured between 2005 and 2007.
Fix: (Photos below) Note - I am not an electrician nor have I ever soldered before and I was able to successfully accomplish this working slowly for about an hour.
1. There were only 2 10Volt capacitors on motherboard of my TV, contrary to the 4 in the LNS4041 pictured on the other thread.
2. Went to Radio Shack and bought 2 1000uf, 35Volt capacitors (See Picture 7) Cost: $1.59 each plus tax
3. Bought a cheap 5pc soldering iron and kit, including 60/40 rosin core solder Cost: $7.99 plus tax
4. Lay unplugged TV face down on a work table ( i covered my table with a blanket)
5. Unscrew and remove plastic back cover of TV...approximately 18 screws
6. Disconnected 5 plugs (take a picture to remind yourself where cords plug in so you can check yourself)
7. Unscrew and remove metal cage (holes all over it) approximately 6-7 screws (See picture
8. Unplug 7 cords that are attached to the motherboard and move them carefully out of the way
9. Unscrew motherboard - 6 screws (See pictures 2 and 3)
10. Carefully lift motherboard out, it is held in place by one metal tab on either side. Just lift one side carefully but firmly and it will unsnap
11. Move your board to the work area near your soldering iron
12. Practice with your soldering iron and solder - use some wire and a metal plate (be careful, plate and wire can get hot!)
13. Before removing bad capacitors (mine were labeled CM852 and CM853, both 10Volts), make a note of which direction the stripe on the capacitor is facing. The stripe indicates the negative polarity...you will need to remember this before you install the new one. (See Pictures 6 and 7)
14. To remove bad capacitors, (this is my method, not necessarily the best method) turn motherboard upside down and using the soldering iron, hold the angled portion of the iron to the lead and the existing solder area. When it heats to melting, gently
pull on the capacitor from the opposite side, rocking it to pull out the short lead you are working on.
15. Repeat for the second lead and then the second capacitor.
16. Install new capacitor - remember, on the new capacitor the short lead is negative, the long lead is positive. (The stripe on the side also indicates negative if you need visual confirmation) (See picture 7)
17. Slightly bend the leads on the opposite (back) side of the motherboard to hold the capacitor in place
18. Apply a small drop of hot solder on the base of each lead
19. After it cools, trim the lead with wire cutters to about an 1/8 of inch above the soldered area.
20. Repeat for each lead - Note - the second capacitor will sit at a slight angle as the new 35Volt capacitors have a larger diameter than the old 10Volt capacitors. This is OK as long as the leads are soldered firmly. I have never soldered before so I worked slowly and though electricians might have thought it painstaking, it was worth it to be careful and not burn the motherboard. If you would like a visual on how to solder a motherboard, try these youtube videos: http://www.youtube.com/watch?v=myyWEEYjjuU
They helped me a lot.
21. Make sure that each lead is solid and then complete steps 1-10 in reverse order.
22. Make sure that you firmly connect all plugs prior to putting on the cage cover and outer cover.
Those are the steps that led me to a successful fix of my TV...for a total of $12 and an hour of my time! I am very thankful to the posters on this forum that gave me the confidence to try this fix. The TV turns on instantly...like new! Good luck with your attempt, I hope this information helps!
Good luck! Cari
PIcture 1 - Back of TV with outer cover removed - Must remove cage that covers motherboard
Picture 2 - Photo of uncovered motherboard with blown capacitors circled in red
Picture 3 - Closer shot of previous photo, location of blown capacitors circled in red
Picture 4 - Picture of what a blown capacitor looks like:
PIcture 5 - Blown capacitors tend to "bubble" up on top where the electrolyte fluid leaks
Picture 6 - Blown Capacitors - 10 Volt with polarity stripe shown
Picture 7 - Radio Shack 1000uf 35 Volt Capacitor in package