How to Test a LCD TV Power Supply

Written by susan raphael
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How to Test a LCD TV Power Supply
If the power supply is not working properly, you LCD may short circuit. (full hd lcd tv image by mattmatt73 from

The power supply of your LCD TV refers to the large circuit board found in the middle of its body. This is hooked with a lot of transformers, two IC's and capacitors. As much as you would want your TV to last forever, you may encounter a problem or two when it comes to its power supply. Testing your LCD TV power supply will allow you to pinpoint exactly what the problem is and if your power supply needs any repair. You do not need to tinker with the circuit board of your LCD TV to test its power supply.

Skill level:


  1. 1

    Check to make sure that your LCD TV is not plugged into any overloaded household circuit. Since your washer, refrigerator and dryer all use up a huge amount of electric power, complicated wiring may lead to multiple items plugged into the same circuit. Plug your LCD TV into its own power socket to test its power supply accurately.

  2. 2

    Connect the power cord of the LCD TV snugly into the power source or socket. Make sure that all connections are snug including your DVD player or cable box. Test the socket that you are using by plugging in another electrical item to see if the current is flowing smoothly.

  3. 3

    Inspect the power cord for any cuts or nicks. Replace any cord that may be damaged or bring it to an electric repair shop for rewiring.

  4. 4

    Test the incoming flow of AC power by connecting your LCD TV to an independent power source. Your power source can be an Uninterruptible Power Source with your UPS cord removed from the power socket. If your TV works, this means that the power supply is in good condition.

  5. 5

    Plug a lamp into the socket and see if your LCD screen flickers while testing your power supply. If the light of the lamp flickers, this means that you may have intermittent power fluctuations. In this case, you must contact an electrician to fix the problem to prevent fire hazards.

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