How to change an RCA Rear Projection TV Capacitor
RCA Rear Projection TV was popular in the 80’s and 90’s before the LCDs and Plasma televisions. A lot of people still have them.
The following are some simple steps on how to check the status of your capacitors and how to replace your RCA rear projection TV dried capacitor . RCA TV repair for a unit that started shutting off by itself:
Please remember that the TV has high voltage and can kill you if you touch the wrong part. Make sure to unplug the TV set for a few hours before making the repair. Do not attempt the repair if you are not a technician. Always ask for the help of an expert.
Step 1 | Open the back cover of the TV
- Remove all screws from back cover
Step 2 | Remove the Chassis from the TV Body
- Unplug the connectors between the chassis and the body of the TV
- Carry the chassis and put it slowly on a safe table.
- Warning: the chassis is heavy and you might ask for help.
Step 3 | Remove the power supply cover
- Remove the Coaxial nut.
- Remove a small screw on the left side; it is very small and invisible. You might need to use Pliers.
Step 4 | Uninstall the plastic base
- Slide the plastic base from under the circuit board and put it in a safe area.
Warning: DO NOT TOUCH ANYTHING INSIDE. Even after disconnected from the power outlet, the capacitors are electrical components capable of storing electrical energy. Some can have the same energy as defibrillator and could easily stop your heart. WARNED!!!!.
Step 5 | Capacitor Check
- The failed capacitors were not found visually, there was no bulge or brown leaking liquid from any of the capacitors.
- We used a capacitor meter ‘ESR’ to check for bad or dried out ones.
- Check each capacitor if it has live voltage or not.
- Dried Capacitor has been found. The liquid in the capacitor dries out because of either heat or poor quality.
Step 6 | De-soldering the failed Capacitor
- De-solder the iron behind the bad Capacitor off
- Heat the hole until it pups through
- Solder sucker to remove the solder from the capacitor pins
- Take note of which way the positive lead marker on the capacitor is facing before removing it. You will need to know for the next step.
- Check the capacitor, how many volts to replace it with the right original part.
- De-soldering can damage motherboards, so first practice on a board you don’t need.
- Use a 40-50W soldering iron with a chisel tip and 0.080″ wide De-soldering braid.
- Also helpful are rosin flux and 60/40 tin/lead solder, in case all the solder doesn’t come out.
- Wiggle de-soldered leads to verify they’re free, and NEVER pull on any that aren’t.
- Keep the board in place
Step 7 | Install the new Capacitor
- Make sure that the new capacitor is the same capacitance rating or it will either not work or work half way through.
- Be careful where you put the negative and the positive
- Put arrows where you see the capacitors
- Solder around the two legs of the new capacitor
- Cut the rest of the iron coming out from the new capacitor. If you don’t cut the rest it will bend on the side of the board and will smash something else and cause a problem.
- Note: Changing capacitors is better than changing the whole board. It saves money and time. You might order a new board that might take about a week.
Before you install back the motherboard with the new capacitor, double check the other capacitors in case they have any visible failure. Use the ESR because the internal resistance is what actually determines their performance in their switch mode; the power supply should be really low, so when it heats up the dielectric material in there, dries out and the ESR increases. The capacitor might still read fine but the ESR is the thing that goes in the roof of the capacitor.
For this RCA TV repair our TV technician did not find any more failed capacitors. Only one failed capacitor was changed before re-assembly. To re-assemble your TV, follow instructions above from the end in reverse order.
Warning: Don’t risk causing more damage to your product (or yourself!) by attempting to fix it on your own. It’s also easier and quicker for a service technician to diagnose and fix a problem when the product is assembled. In the end, to save time and money, fill a repair form on line and we will help you repair your TV in your home or in our RCA TV repair center.
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