Seemed to short circuited through power surge from
Seemed to have short circuited through power surge from tree limb falling on outdoor power supply. TV turns on, but all touch features on the TV itself do not work and any button I push on remote either turns off or on TV and that is all (Doesn't matter which button I push). Fixable? Any thoughts? Reset?
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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
Hi.It is advisable to turn off your fuse or appliance when there is a power outage..When the power turns back ,it will produce surge amount of voltage that would eventually damage your appliances.when power comes back it has a very abnormal current flow.it may rise or fall which might beyond the wires capability.meaning it goes beyond what the wire can carry..It might be that when the power supply return it gives high current and short circuit the ground and live wires of your electric range.You better check continuity using an OHMETER.MULTITESTER if there is no short circuit.If the reading of the multitester if set to ohms is too high thats beyond the maximum amount going to the right,then there is a short circuit..
Simple answer: blown power supply - any one of a number of components within this area could be affected; IC regulators could be short-circuit or destroyed as a result of the surge, resistors could be open circuit, diodes could be short-circuit and electrolytic capacitors could also have leaked/burst open. Even the optocoupler could also be damaged, and if the supply uses transistors, these too could have suffered short-circuit or internal leakage.
It's easy to tell if a power supply has been severely damaged by a surge - there will be numerous scorch-marks on the board around some of the parts, some parts including resistors will be broken, some electrolytic capacitors may have exploded.
To put it simply, you're better off sending it to a repair shop - obtain a free quote if possible, then make a decision yourself afterwards as to whether or not you think it's worth going ahead and getting it fixed by them. Up to you.
Switchmode power supplies in any appliance are complicated beasts to work with, and quite often tend to develop weird behaviour. The cost of the repair depends largely on the extent of the damage caused by your power surge, and how many parts were affected by it.
There were 2 Switching power supply circuit inside the ATX PSU. There's a Standy PWM circuit whichSupply +5V to the PWM IC of the Main PWM. Stand by pwm still working or insufficient voltage, lower than +5V. This is the reason you still have Green light. Check or replaced small filter capacitor around 100 MFD 16V, open resistor or shorted diode that was nearest of the PWM IC.. Watch out for charge voltage on big capacitors.
This is somewhat subjective. Eveybody does it a little different.If you are cutting limbs from a tree, start an undercut about where you want the limb to fall free of the tree. Use the upper edge of the chain to cut it about a fourth of the way through. Then start from the top of the limb over where you made the undercut.
Chances are if the varistor fails, it fails drastically causing a short circuit across the supply. It will sit across the supply (it will look like a thick ceramic capacitor) and you can check for continuity after isolating that at one end. If it shows low resistance (it should show almost open circuit with a Digital meter), replace it.
It need not be the culprit. If you are familiar working with High voltage circuits ( they are lethal inside a microwave ovens as the current capability is high here), you can discharge the doubler capacitor and isolate the high voltage diode to check for shorts in the HT area.