This set was hit by lightning, I'm told. The audio cable was disconnected, and there is a red marker line across what appears to be the audio amp! Is it a normal procedure for techs to mark a alleged failed part like this?
Any ideas of where to look for suggestions?
I do have some basic understanding of electronics, and can check diodes, resistors, etc., but I need an area or device to check suggestion!
Any help or suggestions will be most appreciated.
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Re: Lightning Strike, Plz Help!
The red line on ICS is quite normal it does not mean the part has failed.
To be honest in most cases if a tv has been hit by strike it is a right off & scapped.
What I suggest is to remove the main pcb & power supply pcb if its seperate & inspect the print side of pcb for signs of arcing tracking or burnt track. Repair any damaged track by cleaning off the coating to get at clean copper then solder wire accros to bridge the damage.
Check the power supply resistors diodes transistors look carefully for any burnt components or components which are physicaly damaged.
Check the line output transistor this will be near the large transformer with a thick red ht lead going up to the crt.
Check all the components you can in the line stage look at all the ICS to ensure none of them have holes in them or have blown apart.
Hopefully you find some or one if your very lucky that is damaged replace it & try your tv.
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The damage from a lightning strike tends to be random. Sometimes it's minor, and only a few parts are affected. Other times, many parts are ruined, or destined to fail soon as a result of the current surge.
If the strike came over the power line, the input surge protectors in the power supply should be replaced, even if they look good. It would be prudent to replace the entire power supply. If you had the set plugged into an external surge protector, that should have taken most of the hit and should also be replaced. (Some surge protector manufacturers will pay up to a certain amount for repair or replacement of equipment plugged into their products if it is damaged by lightning.)
If the lightning came over an unprotected input cable, fixing the set would be a gamble. You could end up changing a lot of modules, beginning with the main board.
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.
It may be fatal and if you have homeowner/renter insurance check that out.
If it took a direct hit the set would have been in a thousand pieces so someone who knows sets needs to look inside just to see if toasted or not--this kind of damage in the newer sets can cause so much damage the set may no be worth fixing.
There is a high probability that your laptop has been fried, especially if it was plugged into the mains at the time of the lightning strike.
A lightning strike could damage many components and even if you could get it fixed (most likely require a motherboard replacement) there are no guarentees that some other component won't fail in the future.
If it was me, I would put my money towards a new laptop and get a surge/lightning protection power board and disconnect the laptop from the main during a lightning storm.
Assuming this line is across the screen horizontally (side to side), this means the vertical deflection circuitry is dead. In late model sets, there is a Integrated circuit package which drives the vertical yoke coils. Possible defects: the I.C. itself, bad solder connections where it solders to the board, missing voltage source to this I.C. (often around +24 volts), or a bad electrolytic capacitor in the associated circuitry. This latter often results in a non-linear picture, or less than full deflection condition, rather than a thin line only.
It is possible lightning caused this problem, (I've seen some rather illogical damage from lightning ) perhaps it produced enough of a surge to pop the I.C. or a fusible resistor in that voltage source noted above.
Check the cable line thats attached to the bad set on another set side by side. If the other set still has no channels your going to need to trouble shoot or replace the tuner control bad and the tuner assy.