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Motherboar short power supply canot working (protect)if i connect to my laptop and the others chipset include onmainboard very hot @regulator sytem

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HP dv6000 laptop not charging problem, adapter, battery and power jack looks like it works fine


If your battery, charger, and DC Jack are ok, then the most common problem is the surface mount transistors on your HP's main board called MOSFET's. They are small 30V N channel 8 pin components soldered to the main board. The boards also have transistor circuits which switch back and forth between a charging and discharging state. However these rarely ever fail. The MOSFETS fail because of the thermal loads which they must endure. Although some notebooks (like the Gateway I'm currently on) have a DC jack which serves dual purpose of supplying DC 19V AND connecting/disconnecting charging circuit. However your HP dv6K does not.
However it's worth mentioning that these models have had all sorts of problems...most notably poor thermal design to begin with that usually creates solder connection problems with the main chipset especially on AMD models. Good luck.. :)

Mar 27, 2013 | HP Pavilion DV6500T Notebook

1 Answer

Sony KDL52XBR4 will not power up


Some power supplies have a short circuit protection. it turn off the power supply if it detect an overload/short condition.

Mar 08, 2013 | PC Laptops

2 Answers

Usb device not recognized, works only when plugged on hub


All PCs provides power supply via USB port. The power is controlled by electronic circuit. Sometimes when overloaded the circuit burns out (the last controlling transistor, actually). This does not prevent the data communication, because it is separated circuit. But if the device is not powered it cannot communicate. When you plug the USB device to powered USB hub, then all go right.
Are you able to use the USB ports with other USB-powered devices like USB sticks, mouses, cameras? If not, the mentioned circuit is burned out. If they work OK, then your internal USB hub provides less power current than needed. In both cases there is nothing to do. The circuit resides on the mainboard of the laptop and replacement is expencive. Use it with that external USB hub you have.

Apr 08, 2012 | ASUS G73JH-RBBX05 Refurbished Notebook PC...

1 Answer

With a battery charged in a different laptop, this one will work. Included AC cord as well as other compatible (19V 3.42A) cords will NOT power the device OR charge attached battery. My deduction is that...


It is probably the protection fuse link that has failed. It is on the motherboard near the power input, or the onboard power supply has failed.
Consult an authorised Toshiba repair service.

Jan 11, 2011 | Toshiba Satellite A100-S8111TD Notebook

2 Answers

My acer 3690 laptop knocks itself off after 30 mins. It gets too hot.


restore the factory optimal defaults in Bios...save changes and take a trial again ...if it is still the same ...go to screen savers and take a look at the power saving management and get them all out ...(its possible to have a cause here ) the last thing ...see how you can insert it a heat dispenser...or an extra external cooler...Probably it is the place where you keep and work it ....its too hot ..and it do not handle the heat ..
Its a good thing that the protection of the Cpu is working ..this is safe way to use it ...but its annoying when you are working something important and suddenly it remembers that its too hot and shuts down..:D

Jun 08, 2010 | PC Laptops

1 Answer

My toshiba laptop will not stay on.


does it overheat? try removingthe battery on the laptop use the adaptor only then power your system without the battery, check if the system will power on properly without it shutting down if the sytem runs perferctly without thw battery you'll need to have the system checked possibly the battery causing a small glitch on the motherboar or the motherboard is having issue with the power distribution with the battery connected to it either way this is going to fall in the process of elimination to find out which hardware is causing the system to shut down also check if the fan is spinning, if the system is overheating and the fan is not spinning the system will really shutdown instantanous after powering it up of it maty power but not even boot in widnows.....

call your OEM original equipment manufacturer ask if you still have warranty if you do its best that you have it repaired with them to be sure that it will be repaired by trained technican spefici for your laptop brand ^_^

Jun 05, 2010 | Toshiba Satellite A135-S4527 Notebook

1 Answer

Laptop not powering


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:
  • Short circuit due to wet liquid (problem goes away after liquid evaporates)
  • Short circuit due to dried liquid residue
  • Corrosion (especially bad with soda such as Coke or Pepsi)
  • Electronic components damanged by above short circuits
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

Aug 17, 2009 | HP6710b 2.1GHz 15.4 160GB 5400 PC...

2 Answers

Shutdown problem


press the power button for sometime.. may work.. if it dsn't, then remove the battery from behind..

Jul 10, 2009 | HP Pavilion ze4930us (PR299UAR) PC...

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