OK - I have fixed the TV.
As noted in the previous post, I replaced all of the capacitors, but the TV still cycled on/off.
I found a post back in April 2010 by "turboroe" that mentions a bad eeprom, which prevents the TV from cycling on properly - the eeprom may have been corrupted from the capacitor shorting out earlier.
I followed his instructions on how to reset the eeprom, and low and behold I now have a functioning TV.
So, for the benefit of those that haven't had success with the capacitor replacement, and only for those that are comfortable soldering very very tiny IC leads, you might want to try the procedure below...
Note, on my model LN S4051D, the atmel chip was on the adjacent main board, behind the metal cage, and facing towards the back of the TV, so you don't necessarily need to remove the board to solder on the two leads, although I did as I wanted to use a magnifying lamp to do the soldering. I don't think you could do this job without some kind of magnification, as the leads from the atmel chip are very small and close together. Don't forget to figure out which lead is #1, on my chip it is a very very small dot in one corner, not a notch on the case as the larger IC's have. Short out pins 5 and 6 together for no more than 2 seconds as he says - and I found that as soon as I plug the TV in, it starts it's cycling, so be ready to remove the wire short 2 seconds after you apply power to the TV. Also, I didn't seem to find any bad data while wandering around in the service menu, but the checksum came up- , but then it seemed to change to a hex number of some kind, perhaps that reset the eeprom. I did a few cycles with the 'watchdog' circuit turned off, than I turned it back on, the the TV is still turning on just fine so I'm going to leave the watchdog curcuit on from now on. I suspect that curcuit is what is allowing us to fix these TV's as otherwise with a bunch of bad caps, one would expect more component problems....
here is his original April 2010 post:
Main Problem: Popped low quality power board capacitors
Solder in new capacitors (the medium 1000uF next to the power board<->main board connectors. preferably 35V).
I strongly recommend swapping ALL the 1000uF ones for new - better quality - ones.
If TV still doesn´t turn on: EEPROM memory values are bugged.
Q. Why does this happen?
A. When Tv is plugged in it attempts to read EEPROM and reads some bad data, then resets (probably due to the Watchdog).
Note: Data gets corrupted because of the power board capacitors problem.
- disable EEPROM chip to prevent TV from resetting (following steps 1, 2 and 3)
- manually set correct values to the EEPROM (following steps 4 to 10)
The EEPROM chip:
type: ATMEL 24C256 - small 8 pin IC surface mount (must be 5mm x 3mm)
location: on the bottom side of the main board
search google for: atmel 24c256 datasheet
download the datasheet and check the pin numbers
1. Short out the eeprom pins 5 & 6 ( the two pins that connect to resistors ).
The easiest way is to carefully solder a thin wire (about 6" length) to each of the 2
little round pre-soldered pads that lie in front of pins 5 and 6 and use the wires
as a contact breaker to easily shorten the pins.
2. Turn on the power - Instead of the usual noticeable relay click, you get a faint click,
the backlight stays off, nothing else happens.
3. Wait around 1-2 secs ( anything longer than this NEVER seemed to work ).
4. Remove the short.
Note: by now the TV is already in normal standby operation, but EEPROM values are still bugged.
5. Press the service mode key combination on the remote control.
Note: check service manual for the correct combination or try the following:
* info, menu, mute, power on) - In that order individually, one at a time.
* mute, 1, 8, 2, power on) - In that order individually, one at a time.
6. TV should come on with noise picture and then the service menu (press Source if it is difficult to read)
7. Immediately go to option Adjust and turn OFF the watchdogs
(especially in case your TV keeps turning off by itself at this point)
8. Now, for EVERY OPTION in ALL THE SUBMENUS, change EVERY VALUE and then change it back (toggle right-left)
to assure the EEPROM data is re-written correctly.
Note: To enter some submenus you have to press the right arrow instead of OK button.
To return, press exit.
Some values will still be currupt, though, and you will have to guess the right
one or consult the service manual for factory defaults, such as Panel vendor,
Memory vendor, panel type, etc.
But the TV will still work anyway, maybe not with the best image.
9. Go back to Adjust and turn back on the watchdogs.
10. Finally, Set TUNER to AUTO and then go back to root menu, goto RESET and select it
by pressing the right arrow.
Note: I recommend keeping the wires soldered to the EEPROM chip. You may need them in the future.
Just remember to tape the ends to prevent a short-circuit with the chassis.
Other thoughts: If your TV is clicking but still turns on after a while, I STRONGLY suggest you immediately stop using it and swap the power board capacitors at once before your EEPROM data gets bugged.