- Unit won't turn on
- Unit won't return from standby
- Unit turns on and off intermittently
- Screen flickering or distorted
- Lines across the screen
If you're experiencing any of these, it's worth taking several minutes to check your circuit board capacitors.
Step 1: Tools needed
- Screwdriver, hex wrench, or whatever's needed to open the case
- Soldering iron
- Replacement capacitors (you will find the values for this in the following steps)
Also optional but helpful is soldering wick, which is available for fairly cheap at Radio Shack.
In this example I'm repairing a digital TV converter box that will power on, but does not activate from standby.
Step 2: Open the case
Using your screwdriver or other tools, open up the electronics case so that you have easy access to the circuit board. If you're having trouble, look up the manual online to find out where the various screws and tabs are to open the case.
Bring it up the light so you can see the electrolytic capacitors easily.
Step 3: What a blown capacitor looks like
Think of it like a vacuum-sealed glass bottle. When the seal is intact, the bottle cap is flat, and when you break the seal, the bottle cap pops up. That subtle "popping-up" is exactly what you're looking for.