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Rick williams
Rick williams, Technician
Category: TV
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my samsung ln52a750 lcd tv turns on and off continuosly. i

Resolved Question:

my samsung ln52a750 lcd tv turns on and off continuosly. i have downloaded the firmware fix but it will not stay on long enough to download it.
Submitted: 7 years ago.
Category: TV
Expert:  Rick williams replied 7 years ago.

Thank you for posting your question on Just Answer! I will be happy to help you with this problem.



this is a very common sense approach.


(Please click on high lighted words)


First push the menu button with the set s remote and if nothing comes up then


Friend this is a very common problem with LCD and also DLP within the power supply the capacitors

Start to fail and the way you can tell is to check them visually for swelling or expanding of the top.

It will be easy to see the bad caps will not be as flat on the top as the good ones, this is the problem,

Exchange them and you will be ok, Well good luck friend. And if it doesn't work make sure the power supply is sending 24v to the inverters when you turn the set on your meter should climb but won't reach 24v because unit will shut down and if so we ruled out the inverters or backlight I seen this problem also caused by the signal board it has a power on command missing and it looks like the power supply is bad but actually it's the signal board, it may be labeled on the board a active high or low 5v which sends the command to the power supply.

Good luck friend, and if unit works fine, feedback and a bonus will be appreciated

Capacitor pictures inverter pictures... cold spray can be used if your set works for awhile then shuts down.


Hope my efforts are appreciated.

Customer: replied 7 years ago.

I plan to accept your offer however, I replaced the ip power board and still have the same problem, why does the tv turn on automatically when plugged in and then cycle on and off continuously without any response from the on/off switch

Expert:  Rick williams replied 7 years ago.

If you unpluged this board and the unit continued this issue, Then no question the problem is the Main board friend.




These are some part stores, CALL THEM IF POSSIBLE always check with manufacturer , And you may need the name of the part and its part number off the part itself


And this one rebuilds board's very helpful company




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