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.
Written by Keith Schneerer
Certified Appliance Tech · Founder, RemoveAndReplace.com
Keith has spent 30+ years repairing machines, starting as a military mechanic and later maintaining food processing equipment before moving into appliance repair. He founded RemoveAndReplace.com to share field-tested repair advice.
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I have an rca 55ls55rs lcd tv. The TV powers on but flickers. I got it from a company that left it on alot. I believe it’s the power supply board but can not seem to locate one. The board says rsag7.820.1357 roh ver.d
Yes I just took it apart today and there is four that is bulged. Well here’s the thing I was driven down the road and there was this TV and a projection TV with a sign that said big one works little one don’t when I got then home it was the opposite and the it worked fine for like a day and half then the Vizio light would stay on orange and click on and of the then it just completely went off no light or anything.
Beau,
You can try replacing the cap… but is the cap visually bulged or look deformed in any way? Try that first and if that does not fix your issue then buying a new power board or main board may be the next step. What exactly is the issue with the TV?
-RR
I have a vp322hdtv10a and I have changed the power cord and it is plugged straight in to the wall. I don’t want to pay 60 for a new power board. Which I’m sure that it has something to deal with and not the main board. Sould I replace the cap first just in case sense it is only $8?
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