Question about Samsung Televison & Video
The model number for the TV is, LNT4665FX/XAC and is about ten years old. After some research I thought it might be a blown capacitor on the power supply board. I took off the back and inspected the power supply board but all of the capacitors look normal to me. I don't see any bulging or leaking of any of the capacitors. I have not done a voltage test. I've looked at the logic board but can't see anything that looks abnormal. I was hoping to be able to change out the capacitors but, again, I can't see any that look bulging. I could replace the power supply board and or the logic/video motherboard but I'd like to be able to pin the problem down to one or the other. Any suggestions to determine where the problem may be?
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Posted on Jan 02, 2017
SOURCE: No longer turns on
It's well worth replacing the capacitors, but this problem can be caused by a short on the power supply (Which is what the caps do). Most shorts that arise in power supplies are result of a shot transistor or diode and of course the electro caps. Check these while your changing the caps.
Good luck with it.
Posted on May 25, 2009
It would be a lot cheaper if you just replace the two caps that have gone bad. Just get a cheap solder pencil from the store and about an inch of solder and you are in business.
The Power Supply Board is the center Board (towards left) after you remove the back off the TV. Remove Board from TV with the 6-7 screws. Replace capacitors CM852 & CM853; 2200ufd 25volts.
Thaks for using FIXYA, BIG IRISH.
Posted on Jan 02, 2010
In almost all cases where the set is taking a long time to turn on and then turning off it will be the Power Supply board that will have bulging capacitors, usually three to five. Look on the upper right side of the Power Supply and look for any blown caps. You can replace these caps and you will be fine. Now the other cause can be the Power Switch is shorting out. You can disconnect the the Power Switch but not the IR sensor and then turn ON the set with your TV remote and see if this stops the problem. If you are not skilled in component level repair on the Power Supply board then buy a new Power Supply board and install it.
Posted on Apr 16, 2010
My Sony Bravia LCD Model-KVL37S400A is not getting the Main Power supply. The LCD is not getting switched on. When i am trying to switch on the set nothing is happening.
Posted on Dec 24, 2010
You can't see if a cap is good or bad jus looking at them they have to be measured>They loose their capacitance because they dry overtime.
I do sugest that you replace you power supply module or replace all caps.Possibily you may have a broken line in the PCB
Posted on Nov 01, 2012
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