How to troubleshoot LCD, Plasma, CRT TV ?

This basic troubleshooting tips/procedure for
LCD, PLASMA, CRT TV WILL HELP YOU OUT.

•Define Look at the symptom carefully and determine what circuits could be causing the failure. Use your senses Sight, Smell, Touch and Hearing. Look for burned parts and check for possible overheated components. Capacitors will sometimes leak dielectric material and give off a distinct odor. Frequency of power supplies will change with the load, or listen for say a relay closing etc. Observation of the front Power LED may give some clues.

•Localize After carefully checking the symptom and determining the circuits to be checked and after giving a thorough examination using your senses the first check should always be the DC Supply Voltages to those circuits under test. Always confirm the supplies are not only the proper level but be sure they are noise free. If the supplies are missing check the resistance for possible short circuits.

•Isolate To further isolate the failure, check for the proper waveforms with the Oscilloscope to make a final determination of the failure. Look for correct Amplitude Phasing and Timing of the signals also check for the proper Duty Cycle of the signals. Sometimes“glitches” or “road bumps” will be an indication of an imminent failure.

•Correct The final step is to correct the problem. Be careful of ESD and make sure to check the DC Supplies for proper levels. Make all necessary adjustments and lastly always perform a Safety AC Leakage Test before returning the product back to the Customer.


This basic details will help you to confirm the problem, before going for manually repairing it or getting it repaired at professional tv repair center.

How to connect surround sound speakers on LCD TV?

Its simple.The surround sound speakers require an "Interconnection" box, that is a box with Jacks that the Red & White stereo audio plug into, on one side, and the 3 SS speakers plug into the "Other side" as it were. Usually with SS there is  Rear, Front and Sub Woofer, as this means 3 sets of speakers must mate with the 2 outputs from the TV etc. So the "Line Out" stereo output from the TV, which are usually the Red & White, is the output to the interconnection box, from there it feeds into the SS decoder, some plug directly into the decoder itself, and don't use an interconnect box, but it's all the same in the end. The stereo output is fed into the SS decoder, and then SS signal is extracted from the sign in, and routed out to the appropriate speakers.

Connecting wires as per this above details will help you to get sound from surround sound speakers.

This will help.