Lightning strike, power was out for no longer than a second and came back on - only TV has been effected and will not respond by remote or tv button. Shows it is on. But only getting fast clicking noise and a red reading saying 5.l. It is a Vizio 42" HD set. It has a cable box which seems to be on.

Hi Johnson,

Only 50% chance that the symptoms was caused by a lightning strike because your cable box was powering on fine. Most of the cases when lightning strike near to your area, possible of multiple damaged to the electronic device not only to one particular appliances, most especially if they are plugged into the outlet. Also, fuse will blew because of excessive voltage.

I've suspected that the symptoms was only a co-incidence of lightning strike. If you can hear the clicking of the relay, this is only means that the standby power supply is working fine. However, this board has multiple output voltage feeding the other boards to function well. This kind of symptoms is a power supply related problem.

If you have necessary tools and test instrument and handy with electronics, you can troubleshoot this board to find the faulty parts like open fusible resistors, shorted transistors/IC's, leaky electrolytic capacitor, etc.
Another option is to replace the entire power supply board, this is more convenient if you are going to DIY because no soldering required. Try to find you board HERE. Type the model no. of your unit to the search engine, available parts/board will be display.

Hope I helped you.
Have a nice day!
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Hello
The lightning strike will have trillions of volts, when it discharges to earth. Any electronic equipments, or even rock can be splitted out with it. Even the near presence of it will distroy electrical and elsctronic equipments. It will be ver hard to say, what fault have been happened with your set, without proper checking. Anyway, its power supply regulation section has been effected, as per your description. The serial 'click' sounds indicates that. Some times this may be the only effected part in your TV. If so, replacing the power regulator card will solve the problem. An other part other than power supply normally can be destroyed is 'tuner' block. It can be only confirmed after replaceintg the power board and all ssupply terminals has been set correct. All the components and power board can be bought from most of the electronic sparepart shops at your town. You have to give them the board number, shich will be printed on the board itself. It is best to buy them from authorised service center for Vizio, because, you can make sure that the replacement parts are genuine. Check these. Wish you Good Luck. If you want anymore assistance from me; please be free to get me by FixYa. Ok.