This post from Jovemaprendiz2019.org will show you how to repair tv no power. Capacitors in modern flat screen TVs are notorious to fail. If your LCD or LED TV won’t switch on or keeps clicking, you may be able to save hundreds of dollars by performing this simple repair yourself. I know. You think, “Tune up my LCD HDTV. What’s up?” I’m not mad. This is a simple fix that works for any TV.
How To Repair Tv No Power?
Step 1:
You settle in to enjoy your favorite TV show or movie. And then…nothing! In doubt, you press the power button again…nothing! But you hear a clicking sound from your TV.
“What the… No…Oh no!”
HDTV isn’t inexpensive. To get a new one, most of us must save up to $800-$1000. I’m sure many of you dread the thought of spending hundreds on repairs.
Good news. With a few basic tools and roughly $20, you can have your TV working in less than an hour.
My Samsung LN46A550 46 “LCD HDTV, however, this works on any TV.
Bad News. This fix isn’t for TVs that have been dropped, have a cracked screen, or have been damp. In that case, keep reading.
Step 2: Tools
This repair requires 5 basic items:
- Soldering soldering
- Screwdriver
- Pliers
- Wire Saws
- Amazon Capacitors Replacement
No problem if you require a soldering iron. They’re cheap and simple. This 60 Watt Soldering Iron Kit is excellent. It’s under $20. This 60W soldering iron with stand is roughly $8 (shipped prime) and works nicely.
Step 3: Added Tools
- These tools aren’t essential, but they can help.
- Flexible, ratcheting screwdriver (to help remove all the casing screws)
- Drilling Machine (to help remove all the casing screws)
- removing solder (absorbs melted solder)
- Wire suck (remove melted solder)
- FLUX (flux on solder makes it flow and less “sticky”)
- Metres (test for bad Caps, helpful if there are no visual clues)
Step 4: Remove Stand and Wall Mount
After unplugging the TV, remove the stand. If your TV is wall-mounted, you must first remove the TV from the wall and then the mounting bracket.
Remove the screws to remove the TV stand.
Blue arrows: Remove these 4 screws to remove your TV’s wall mount.
The TV is inside the stand and will not fall over when the stand screws are removed, however it is safer to have a friend keep the TV upright while you remove the stand screws. Then take a side and lay it flat on a carpeted surface.
Step 5:
Keep your TV upright when handling it (like your watching it)
flattened Unusual angles can damage the fragile glass face.
Step 6: Remove all screws from the TV’s back casing
Above is an image of a standard TV’s back. My LG 42LN5300 and my Samsung LN46A550, but all TVs are comparable. Remove all screws along the back casing’s exterior edge. These screws might be 10-16 in number.
There will be screws near any power or wire plugs. These are in the lower middle of the photos. (red rectangle on my Samsung)
Step 7: Remember the Rare Screws
Often a screw or two can be located near the cord plug-in area. Remove those too.
Step 8: Remove Back Casing
Take a photo of your TV with the back case off. This will aid reassembly.
Find the “power board”. The power board is the first board that receives power from the plug and has can-shaped capacitors. On this Samsung TV, I marked the power board in green.
Note:
The “logic board” is the computer that runs the TV. This article does not cover board repair. (But it’s not the issue.)
Step 9: Remove Wiring Harnesses
Disconnect the circuit board’s wiring harnesses. To remove them, simply tug on the connecting clip (not the wiring). This Samsung board has 7 distinct harnesses.
Step 10: Remove Circuit Board Screws
Disconnect the power board from the TV chassis. Like the one in the picture, most boards have 6 screws holding them down. But check it out, there may be more.
Tip:
Although this is a power supply board, it is best to handle it with care and by the edges.
Step 11: Bad Capacitors
Small “can-shaped” Aluminum Electrolytic Capacitors are repaired here. These capacitors are available in a variety of colors and sizes. Not only are these the most likely culprits, but they’re also easy to replace. The faulty capacitors are usually visible. No special electronics or testing abilities are required.
Step 12: Bulging Vents
Because capacitors can create hydrogen gas when they fail, they have vents cut into the tops of their aluminum cans. These are to shatter and release the gas inside the capacitor. A failing capacitor will bulge at the top.
Step 13: Leaking
A leaky capacitor is another sign (electrolyte). This is an orange or brown discharge from the capacitor’s top or bottom. A leaky capacitor usually bulges. It can bulge but not leak.
Capacitors don’t always fail visibly. But, if you see one of the 2 indicators above on your board, you’re almost there. If you don’t notice these symptoms of failure but hear the familiar clicking sound, the instructions following should fix your TV.
Read more:
How To Fix Smart Tv Not Showing Up To Cast
Step 14: Locate Bad Capacitors
On the power board above, I’ve specified which capacitors to look for signs of breakdown. Aluminum Electrolytic Capacitors are the most likely culprits in your case. The capacitors with green arrows are the most likely to be bad, but there are others to check.
Don’t worry if your board differs. Examine all capacitors to find the faulty one(s).
Avoid big capacitors (2 or 3 will be on every board). Because they are so high voltage, they are difficult to operate on safely.
Your board may appear different, that’s fine, just look for capacitors that resemble the ones shown above.
Note:
These are close-ups of my TV’s board. The bulging blue capacitors in the foreground. I’ll replace these capacitors. The others appear ok. I recommend replacing all 4 of these capacitors, as well as any others that show signs of failure, while you’re in here.
Step 15: Remove Capacitors
They have polarity. They feature a positive (+) and negative (-) side, just like a battery. Before removing any capacitor, observe the direction of the white stripe. The new capacitor must be installed in the same manner. As you can see in my photos, I wrote on the aluminum heat sink with a pen.
Step 16: Let the Iron Do Its Job. Do Not Force the Capacitor Out.
Turn the board over and carefully identify which spots on the board are the wire leads from these capacitors.
To keep track, circle them with a sharpie. Grab a friend and help you with the following step. Equilibrating a circuit board with a hot soldering iron and pliers can be difficult.
Allow 10 minutes for the soldering iron to heat up.
With the circuit board on its edge, have your friend gently pull one of the capacitors with the pliers. Apply the soldering iron tip to one lead on the board and keep it there until the solder melts. Replace the lead until it melts. Keep switching the leads. Faster melt time each time. After a few oscillations, the capacitor will simply fall out.
Replacing each capacitor in turn
Step 17: Go Shopping!
Capacitors must be replaced like for like. There are three ratings:
- uF (micro farads)
- Temperature
- Voltage
- uF (micro farads)
- Ideally, the uF and temperature ratings should be accurate. Using a larger uF capacitor is permitted if it is within 20% of the original.
- Temperature
- You can go higher but not lower than the temperature rating.
- Voltage
- Try to match. If needed, use a greater value. NOT LESS
- Your neighborhood electronic store may have replacement capacitors. But you can get replacements at Amazon.com.
Step 18: Installing a New Capacitor
Insert capacitor, ensuring the negative side is in the right spot. (Check your notes and photos)
If there is hard solder in the hole, simply melt it and insert the capacitor leads.
Step 19:
Bend the Leads Back to Secure the Capacitor
Step 20:
Snip the leads so that only 1/8 “Protrudes
Step 21: Solder Leads
Heat the soldering iron and solder on lead until the solder melts. Apply the iron to the lead and solder a few times to cleanly melt the solder on the lead. If you use solder flux, the solder will bond cleanly.
Step 22: Done
Here is the final step on how to repair tv no power. Added capacitors! Any flux or solder residue can be cleaned up with a moist cloth.
- Reverse the Process
- The six screws hold the circuit board.
- Attach the electrical harnesses.
- Recover the back.
- Turn on the TV and smile because you saved a fortune.
- This fix worked for me.
The best way to keep your television from being damaged by power surges
Before we get into how to repair the damage done to your television as a result of a power surge, let’s take a quick look at how to avoid power surges from happening in the first place. By knowing how to prevent surges from occurring, you can save yourself the trouble of having to reset or repair your television in the future.
Removing the plug from your television: As previously said, unplugging your television during a storm is one of the most effective methods of preventing a power surge. As a result, lightning-induced power will not be able to surge through your electricity distribution system and overwhelm your television set.
Overloaded circuits must be resolved: In addition to adverse weather, overloaded circuits are a common source of dangerous power surges. They must be resolved immediately. It is possible that an overloaded circuit will occur if there are two or more large appliances that are consuming power from the same circuit at one time. In order to remedy this issue, consult with your electrician about the installation of dedicated circuits for each major device.
Improve the wiring in your home: Many older homes have insufficient wiring, which can result in power surges occurring. Even if your home was built after the 1980s, it may not be able to cope with the demands of an elaborate entertainment system. Your home’s wiring may be insufficient if you notice fuses blowing frequently, lights flickering or dimming when large appliances are running, or circuit breakers tripping frequently. It is crucial that you do not ignore any of these indications if you discover them in your home.
Conclusion on how to repair tv no power
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