Laptop sparks

You may have caused some damagaehere. You need to be able to unplug the monitor cable, inspect, replace or reseat. If broken or frayed and shorted, it may have damaged the screen or motherboard.

If you are unable to disassemble the laptop, take it to a local shop for an estimate of repairs

what laptop model is it?
i have seen never spikes on a laptop; but it can be caused by the high voltage in the LCD power, or eventually stem from a bad power supply
did you test with another one?

It seems more likely that the connector or the wiring adjacent to it is damaged and actually shorting. This is likely to cause permanent damage unless it's repaired before attempting to use the laptop.
With the mains power disconnected and the battery out, use a strong light and a good magnifying glass to examine the connector and its associated wiring. You will probably be able to see the problem.

imo  -Sparks originate from high voltage, and there's none on a laptop, except in 2 places : screen and psu

@nobus:

I concede that sparks are more readily generated by high voltages, but dead shorts at low voltages can most certainly produce sparks if sufficient current is available. In any case, high voltage in connection with the display is normally associated with the inverter for the backlight, and such voltages are ordinarily confined to the display panel area; I haven't come across high voltages at the motherboard on any computer, be it laptop or desktop.

Regarding PSU voltages, this is certainly true for desktops as they have to step down mains AC voltages and turn them into something the computer can use, but laptop AC adapters commonly output 19V DC, and in this context I wouldn't class this as a high voltage.

there's not much difference in PSU for desktops and laptops imo - one goes to 19V, the other produces 3.3 5 and 12 V

@nobus:

Perhaps my statement about desktop vs laptop PSUs could have been clearer. What I was trying to say is that the desktop PSU has to accept a nominal 100-240V AC and convert it to the voltages you list above, so there is a much higher voltage on its input side when compared to its output side. This is of course also done by a laptop's AC adapter, but its power output is much lower than that of a desktop PSU - generally 60-90W rather than the 230-900W that a desktop PSU typically delivers, and so its components can be potted rather than arranged in a way that enables fan cooling of the bits that get hot. From a laptop's point of view it only has to step down the voltage from 19V DC to the aforementioned DC voltages as opposed to a desktop PSU having to not only step down from between five and ten times that voltage but additionally having to rectify the AC power to DC before delivering it to the computer.

In any case, this discussion is something of a digression from what the OP wants to know, so he needs to respond with more information before matters can proceed.

the power does not come into play - unless you have more specific info
i still see no significant difference

Samuel - how is it going?   any fedback, or comments ?

The spark is from the tiny resistors around the lcd connector seat. And it continuously spark until the battery and charger is removed and now the burn is getting deeper. Pls help

There are bad parts and/or connection issues. If re-seating the LCD cable does not work (seems it will not), you need to get the computer serviced by a local repair person.

pprobably a bad psu - did you test with another - known good one?

Thanks, I took it to local repairer but He said the spark has burnt the motherboard

That is what we said in https:#a42518865 and following posts:  The motherboard is damaged.

since most repairers want to sell new equipment, it can help if you ask the opinion of another shop