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How to fix short circuit on Samsung X20 laptop?

Recently had issues with power supply cord and shorted the mainboard so no power is working, yet the battery still runs the computer. Pull the laptop apart and replaced the power jack and got a new power supply. Still no luck. Could someone with Tech experience please guide me to what I need to fix on the board? Is it the LED or a diode the is faulty?? Someone please help? Just upgraded the laptop with new mem and a bigger hard drive!

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Sounds a lot like the power controller chip is shot. you will need a schematic and correct replacement parts..www.samsung.com might have a service manual for that.

Posted on Oct 09, 2008

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Gets no power from wall or battery


Few things in life are as frustrating and infuriating as working ******* your laptop, only to see the screen go dark due to a sudden power loss. While there's a good chance your hard work and data is gone, the more concerning issue involves the cause of the sudden loss of laptop power. A suddenly dead laptop could indicate a more serious problem, or simply be due to a loose battery or power cord.

Overheating

If your laptop's fan was running hard and fast right before your laptop went dead, it's possible the machine shut itself down to avoid damage from overheating. The internal electronic components of a laptop generate heat when the computer is turned on, and this heat must vent to avoid causing damage to the machine. If the air vents are clogged or blocked and the heat inside cannot dissipate, the laptop will power down without warning to prevent possible damage. To avoid this problem, ensure that your laptop's fans and air vents are clean and clear, or use a laptop cooling stand to help vent the heat.
Battery Issues

Laptop batteries are not exempt from malfunctions, and a sudden power loss may point to a problematic battery. A loose connection may cause a surprise laptop death, as can dirty connectors. Like most other battery types, laptop batteries are not immortal and eventually lose the ability to hold a charge for long. Some laptops have sensors and circuitry to monitor the battery, and will cut power to and from it should it become too hot or exhibit too high a current. Try cleaning the connectors and reseating the battery properly to fix the problem. In the event of a loose connection, a repair technician may be your best course. For malfunctioning batteries, a new replacement battery may be the best way to prevent future power failures.
Electrical Problems

If you were using your AC adapter for power right before your laptop powered off, there may be an electrical problem somewhere along the line. The outlet you were plugged into may have short circuited, or the adapter itself may have overloaded. The connector on the back of your laptop may be loose, preventing proper connection of the adapter. A short circuit within the laptop itself may have occurred, preventing either the battery or adapter from providing power to the rest of the electronics. Work backwards to find the source of the power supply problem. Try a different electronic device in the outlet, and insert the adapter itself into a different outlet. Reinsert the various cord ends into the adapter and laptop to ensure a tight connection. If a short circuit seems the likely cause, seek the help of a professional technician for repair.
Troubleshooting

Try to ascertain what occurred right before the power loss. A physical move of the laptop may have loosened the battery or jostled the adapter cord loose. Try removing and then reseating the battery and tightening the adapter cord. A loud fan noise may indicate that the machine was on the verge of overheating. Let the machine cool completely before attempting to reboot. An unusual noise emanating from within your laptop may indicate a short circuit. A beverage spill can cause the death of an laptop if not attended to quickly, causing short circuits and power failure.
Precautions

Observe standard safety procedures when dealing with electricity, and never disassemble or examine an outlet or your laptop without disconnecting all power first. If delving into your laptop to check for short circuits and loose connections, work in a clean, open area to avoid introducing any new contaminants to your laptop's vulnerable interior.


Read more: My Laptop Suddenly Has No Power ' eHow.com http://www.ehow.com/info_10023896_laptop-suddenly-power.html#ixzz1XFwtBENN

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Sir,

TAKE OUT BATTERY, REMOVE MAINS SUPPLY, HOLD POWER BUTTON DOWN FOR 30SECS PUT POWER SUPPLY IN ONLY DO NOT PUT IN BATTERY TURN ON LAPTOP NOWPUT IN BATTERY

AC power adapter How the AC adapter worksThe most common type of AC power adapter involves a small box, withone wire to go to the computer and another wire to go to the wall.There is usually an LED light on it, to tell you that it is on. (Is itlit on yours?) By the way, Apple notebook power adapters often have anLED that is actually built into the side of the computer, not into theadapter box, so obviously it won't light up when it's not connected tothe computer.
The power adapter box does several things. It lowers the voltage from the wall's 120 volts AC to typically 19 volts DC (it will be labeled with the exact voltage). It includes some power noise filtering. It often includes an automatic circuit breaker or overload detection. If this gets tripped, you can generallyreset it if you unplug it from everything for a few minutes.
You can measure the voltages on your AC adapter with a multimeter. When it is unplugged from the computer but still plugged in to the wall,it is normal to find that the voltage may be 1 to 3 volts higher than theprinted output rating.
Troubleshooting: AC Power adapter LED is off when you plug the adapter into the wall but not into the computerHas it been overloaded? Is the power strip turned on / is the outlet working? Is the cord from the adapter to the wall fully plugged in on both ends (try wiggling)?Your adapter may be fried- try borrowing an indentical adapter from a friendand seeing if that one will work in it's place (but do not plug it in to your computer, or you might fry your friend's adapter).
Troubleshooting: Check output voltages with a volt meter/multimeterFor those of you with circular connectors, your task is easy. Measure the voltage between the inside and theoutside. A diagram on the adapter's label will tell you which should be positive and negative
For those of you with the 3-pin Dell power connectors, I don't have a diagram for you yet, sorry.If you try measuring each of the three possible pairs of pins, you should get 20 volts between oneof the pairs.
Power distribution inside the laptop How laptop power distribution worksvoltregulator.jpgOkay, the power comes into the plug on the back of the computer. This connects it to metal tracesinside the mainboard of the computer. These will be connected to voltage regulatorswhich often output 5 volts, 12 volts, 3.3 volts, and the CPU voltage; they sometimes look like the image at right.
These will be connected to cylindrical capacitors distributed throughout the mainboard. Capacitorsact like tiny, fast batteries, supplying extra power where needed to maintain a steady voltage during high demand.
Finally, power goes to all the devices that need it.
Power for the LCD display is usually done seperately. Generally, LCD backlights require high voltage to operate.A component that might be called a power inverter will step the voltage upto what is needed for the backlight. Sometimes this inverter is a discrete andreplacable component, and sometimes just a chip on your mainboard. It is also involved in the brightness control.
The battery is an important part. It supplys power to theinput-side of the voltage regulators, just like the power from the AC adapter.Additionally, there is a charging circuit, which uses the power from theAC adapter prior to the voltage regulators, to charge the battery. (By the way, this is why the AC adapter voltage is always rated higher than the battery's rated volatge-- you need higher voltage for charging.)
There is a separate page exclusively for Laptop Battery Problems.
Short circuitsAnywhere in your laptop, physical or electrical damage can cause a short circuit.A short circuit will consume all available power, causing your laptop to not turn on.If your power adapter LED comes on when you plug it into the wall, but then goes offwhen you plug in the laptop, you probably have a short circuit.
Troubleshooting short circuitsAn ohm-meter / multimeter will read less than ~3 ohms when you measure theresistance between sides of power going into a short circuit. When measureing betweenthen power pins going into the back of your computer, consider the 2 pins whereyou expect voltage to be applied by the AC adapter. If the resistance indicatesa short circuit, this is bad.
A common trick to help isolate possible problems is to try to removing anything that mightbe a short circuit. Take out the battery, the hard drive, the DVD/CD drive, the floppy drive, PCMCIA cards, USB devices,miniPCI cards. See if the computer will then turn on.
You might have luck with a thermal imager (see story below) to find a hot spot caused by theshort circuit.
Spilled liquidLaptops exposed to small amounts of spilled liquid are repairable in some cases. Liquid can cause the following types of damage:
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  • Short circuit due to dried liquid residue
  • Corrosion (especially bad with soda such as Coke or Pepsi)
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Immediately when a spill occurs, you typically want to turn off thelaptop, turn the laptop upside down (so the liquid goes out the sameway it came in), remove the power and battery, and allow to dry atleast overnight.
To remove dried liquid residue: Try removing the keyboard andcleaning any components that have dried liquid, by using distilledwater and Q-tips.
Computer turns off randomlyYour computer can turn off due to: power overload in the AC adapter,overheated processor / clogged fan,overheated battery, pushing the power button, Windows telling it to,the BIOS telling it to, loose wires (especially the power cord), orintermittent short circuits.
The most common problem is cooling. Try going somewhere air conditioned. Notice if the fan isbroken or clogged with dust (common older HP problem).

Thanks
Good Luck

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The power comes into the plug on the back of the computer. This connects it to metal traces inside the mainboard of the computer. These will be connected to voltage regulators which often output 5 volts, 12 volts, 3.3 volts, and the CPU voltage; they sometimes look like the image at right. These will be connected to cylindrical capacitors distributed throughout the mainboard. Capacitors act like tiny, fast batteries, supplying extra power where needed to maintain a steady voltage during high demand.

Anywhere in your laptop, physical or electrical damage can cause a short circuit. A short circuit will consume all available power, causing your laptop to not turn on. If your power adapter LED comes on when you plug it into the wall, but then goes off when you plug in the laptop, you probably have a short circuit.

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1 Answer

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That definatly sounds like you need to replace the jack for sure....I have fixed two toshiba's with the same problem myself. To get it done in the store you are probably looking at $150-300. Least that is what it was here. So i decided to buy the part i needed off ebay, take the laptops apart and resolder the jack on.

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Have you checked the AC power pin (where the AC cord plugs in)?

Chances are that the pin has come loose from tugging and pulling on it. When this happens the battery charging is intermittent at best. The parts to fix this problem are usually under $10 but the labor if you take it in is gonna run $100-$200. You can repair it yourself if you're comfortable working with electronic components. Not that tough. WHen you get it fixed, invest in a Cable Retention device to keep it from happening again.

Here's a short video that talks about it. . .

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