How to repair an LCD flat screen TV that won’t turn on? I have a 55″ inch flat screen TV that is not working properly and would like to repair it. The TV works but I think maybe a board or a cap inside is bad. Can you give me some advice as to what may be the issue? I will explain what I have found so far. TV has power and it stays on standby just fine, the red light turns on when plugged in but no turned ON. Once turned ON, the light turns orange for a few seconds and then it goes to the ON green light. Sometimes it starts going only to orange but then back to the standby red light. The TV will work but only after turning it ON and OFF like 15 to 40 times. Do you think the power board or power supply is going bad therefore the TV will not turn on properly? Any help is appreciated.
How To Repair An LCD Flat Screen TV With Power Issues
We have seen many large flat screen TVs do this. It is usually one or more bad capacitors on the power board.
- A cap is a few bucks and easy to replace if you can desolder and solder.
- You need to identify the bad capacitor.
- The bad cap will look buldged out or extra fat and deformed.
- The small cross on the top of the cap usually splits when they go bad.
- (This is because of a chemical reaction in the capacitor that expands therefore leading to the buldging.)
- Find the bad cap and replace it.
UNPLUG THE TV FIRST… Then open the TV case carefully and gently. Gain access to the inside of the TV so you can see all the boards inside. Look at the capacitors on the power board for any signs of buldging. If you see no buldging caps then you may need to just replace the complete power board which are not expensive.
LCD LED TV Repair power boards
At times, caps don’t always bulge out & you cannot measure capacitance with a regular volt meter. You COULD order all the electrolytic capacitors you need for the TV power board. This would be time consuming and might not even work. A new power board would make the most sense. Need to find a special part for your LCD or LED flat screen TV? Here is a Parts Store for LCD TV Parts.
TV Power Supply: The power board converts the ac line voltage which is 110 volts AC to lower voltages that are required for the operation of the television, very important is the stand by 5 volts needed by the microprocessor to stay wake so when it receives a command such as power on to turn on the power supply, then the power supply generates the secondary voltages needed which can vary by television, some are 12 to 18 volts needed by the audio circuit and 24 volts supply to the inverter board and numerous other voltages.
LCD LED FLAT SCREEN TV power boards
Here are some videos for Repairing an LCD LED flat screen TV with power issues…
LCD TV Repair – No Power, Power Supply Common Symptoms & Solutions
How to Replace Power Supply
LCD TV Power Supply Tutorial Help for LCD TV Repair Fix
Element Hisense Dynex Insignia LCD TV Power Supply Repair Fix
Involves troubleshooting and repair of the power supply board
Testing LCD TV Power Supply Boards~STEP BY STEP
Need to know for sure if your power supply board is faulty before buying a replacement?
Easy way How to test Capacitors, Diodes, Rectifiers on Powersupply using Multimeter
Best Easy Way How to Accurately test Diodes, Capacitors, bridge rectifiers in TV power supply boards,
“how to use multimeter” to test or read TV parts in power circuit boards commonly in LCD, Plasma, DLP TVs
How to Troubleshoot an LCD TV
Three main ways to troubleshoot an LCD TV that does not require in depth knowledge of TV repair
Do you know of easier ways to diagnose and fix an LCD LED TV with power issues? Please leave a comment below.
Mike,
If you suspect a bad cap in your Samsung TV is causing the NOT POWERING ON issue, then replacing the power supply board is the easiest way to fix the issue. If you have made sure the cord is secure to the TV and it IS getting power but the TV will not turn ON, then you most likely have a power board that is faulty. This could be because a simple small cap has popped on the board. Buy a new power supply board for your TV and that SHOULD fix your Samsung TV. If you need more assistance please let us know.
-RR
I have a 46 inch LED Samsung flat screen that just started clicking constantly when the power was turned on, but the TV will not turn on. I have looked online to see if others have had this problem and from what I have read, it appears to be a capacitor problem. I called about replacing the capacitor and was told it would cost $175. Then I read about replacing the power supply board which seems to be less expensive and easy to do myself. It is a model code LN46A550P3FXZA, serial #ALXK3CPQ507347V. Any help will be appreciated.
Zac,
Have you made sure the breaker is on since you had a power outage? Do you have the TV plugged into a power strip? Power strip is ON? Cord is not damaged? If the obvious has been checked, you may have a bad ribbon cable in the TV or a popped cap on one of the other boards. Have you checked?
-RR
I have a Samsung 50 inch, model no: PN51E535A3F. The TV was blown during a storm in a power outage. There was no sign of damage on the power board but I replaced it anyway. The TV still won’t turn on, what step should I take next?
Sarath,
Have you checked this website for the Samsung TV Oscillator? According to the parts list it is available and is under 10 US dollars.
-RR
My samsung 28 inch led got issues with smps in which oscillator is fused. The service center guy told that oscillator is not available in market and the full board needs to be replaced and it will cost 6K. Do u suggest any alternatives?
Randy,
The issue you are describing with your Apex TV sounds like the power supply board is on the fritz. Have you inspected the TV to see if the power cord may be bad, or where it connects? Try another electrical cord, plug in to another outlet. If the cord is not the issue, then the power supply is the most likely issue causing your problem. Troubleshoot further before replacing.
-RR
Hello I am having a problem with my Apex TV le4643t. It will turn on with no problems sometime and then if i turn it off it will not come back on I have unplugged it lots of times to get the TV to turn back on. I am just trying to figure out if its the main board or the power supply board The only light that comes on is a blue light when it is on.
Justin,
Be sure your power cable is plugged into the TV and wall socket securly. Replace the power cable if needed. You can get them in any store that electronics are sold or online. Do not plug the TV into a cheap power strip that has surge protection. The junk power strips can go bad and cause situations that can damage your TV. To see if it is the cord or power strip issue, plug it directly into a wall socket. If all this is okay, the most likely issue is the power supply board in the TV. You can find them online and even on Amazon for cheap. Also be sure the issue is not with the TV input where the plug attaches into. If you do decide to change the power supply board, the instructions will be with it and YouTube videos can give you even better instructions to remove and replace. Here are Dynex TV parts.
-RR
I have a dynex 55″ that will randomly shut off and sometimes you can turn it right back on and sometimes it shuts off multiple times.