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Lightning strike came in via cable not power.

We just had a lightning strike yesterday and the cable box got friedalong with my modem. My LCD tv will turn on but on all of the inputsit says "no input" and the screen remains blue. I tried to play a DVDand use some of the other inputs but none of them work either. Themenu and all of the tv controls work (source select, menuscreens,...). Is there an easy way to fix this problem? I think thelightning came through the cable rather than the power source.

Thanks

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  • clarkj33 Jul 31, 2008

    is it worth fixing? or will it be cost prohibitive?

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Your tv is going to need internal repairs. I recommend using our premium service to help walk you through these repairs. Or contact a local repair service.

To avoid this in the future I recommend an inline surge protector or a "green" switch.

An inline surge protector makes sure that all power to your tv comes through at the same level and does not spike or fall. It has a battery backup as well.

A green switch is a way of rewiring your home or your entertainment center to allow you to disconnect all power to your entertainment center when you are away, when a storm is coming, or when you are simply not using the system. A remot control can restore the power.

The average home entertainment center has one of the highest drains on electricity in the average home for appliances that are not in use. that is what makes the green switch appealing.

CH

Posted on Jul 30, 2008

  • Ken Jones
    Ken Jones Jul 31, 2008

    It is worth looking into repair. Sometimes the internal repair can simply be repairing or replacing a small electrical lead. But there is no guarantee on how much it will cost until the unit is opened up.

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When and How Should a Surge Protector Be Used on a Fixed Switch?


Common Causes of Lightning Strikes
  • Outdoor network cables or power cables are routed overhead.
  • A switch is deployed outdoors but is not properly grounded.

Damages of Lightning Strikes
  • If power cables of a switch are routed overhead in an outdoor environment, lightning strikes may burn the power supplies.
  • If network cables of a switch are routed overhead in an outdoor environment, lightning strikes may burn interfaces of the switch.
When a switch undergoes lightning strikes, overvoltage is induced by lightning on network cables and transmitted to interior of the chassis. The surge protection measures, such as lightning rod and chassis grounding cannot prevent the damage. Therefore, surge protectors or surge protection circuits are recommended.

Surge Protector Use Precautions Take the following precautions to protect a switch from lightning:
  • Ensure that the ground cable is connected to a ground bar or a ground point on the cabinet.
  • Avoid routing cables overhead in an outdoor environment. Bury cables underground or route them in steel tubes.
  • To protect network interfaces against lightning, use 8-line surge protectors (or Huawei certified 4-line surge protectors).
  • When installing a network interface surge protector, connect the IN end to terminals and the OUT end to network interfaces of the switch.
If a fixed switch is installed in a network box, follow these instructions:
  • Connect the ground cables of the switch and surge protectors to the ground bar in the network box.
  • The maximum length of a ground cable cannot exceed 40 cm, and a length of smaller than 15 cm is recommended.
  • If the network box is located outdoors and power cables are routed aerially over a long distance (more than 300 m) to the network box, it is recommended that you install a power supply surge protector in the network box. The decoupled power cable must be at least 3 m long
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Had Lightning strike. TV box destroyed and tv does not get power. Which boards may need to be changed?


The power supply board is the first board to feel the impact of a lightning strike.. Try that one out first.

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Which circuit board on my Smart TV might be broken after a possible lightning strike. There are two main ones. The power is getting to the unit, but I can't get the menus, connections etc to work.


Nobody can predict, what might have been happened to your TV after a lightning strike. Do you thing anybody can? Is any technician have a super-natural power to predict the faults that might have been happened due to lightning (More than 10 Million volts to start on stroke) ? Can you?
Sorry.
Contact the authorized service center. OK?
http://electronicshelponline.blogspot.com/

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It could happen yes it would depend where the strike entered the TV. Not all lighting strikes hit on the electrical lines, on a TV they can come through the cable, as well as a antenna if you have one hooked up.

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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!
Thanks for using Fixya.

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