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Bad power plug going to woofer can i replace

Plug coming from ac adapter going to woofer has a short

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The plug can be replaced. Radio Shack might be a source for a replacement plug

Posted on Apr 21, 2013

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Total Power Failure When Using the AC Adapter


1) Check the AC adapter. Use a multimeter set to DC Voltage, (Symbol is a dotted line over a solid line)

You aren't checking for voltage output, so much, as you are checking for an intermittent break.

AC adapter plugged into power, and probe leads of the multimeter touching the plug of the AC adapter going to the laptop, have an assistant gently wiggle;

1) First the power cord going to the AC adapter.
2) Then the cable from the AC adapter TO the laptop.

If you get an intermittent reading on the multimeter, you have a broken wire in the AC adapter cable, or power cord.

2) If the AC adapter shows VERY close, to the voltage it's supposed to be putting out, AND there is no intermittent break, go to the DC Power Jack.

[ A economical multimeter can be purchased for around $8 to $12.
Available in a multitude of stores. An auto parts store is but one example.

Analog, (Meter with needle), or digital is fine.

Multimeter's vary in style.
It will have a Function knob in the center. This is turned to DC Voltage.
As stated, if just a symbol, it is a dotted line over a solid line.
IF, there is more than one DC Voltage scale, set it to the 0 - 50 Volt scale.

The red probe lead is the Positive lead.
The black probe lead is the Negative probe lead.
You are testing DC Voltage. There is a Positive, and a Negative.

The plug of the AC adapter, that plugs into the DC Power Jack on the laptop, will have a Positive connection, and a Negative connection.

Plugs vary. The most common is a plug with a center hole, and a surrounding metal cylindrical shell.

The Center hole is Positive.
The outer cylindrical metal shell is Negative.

Need more advice post in a Comment ]

Depending on what laptop we are discussing here, the DC Power Jack can be soldered directly to the motherboard, OR it has a cable attached to it, and the cable plugs into the motherboard.
(DC Power Harness)

IF, it is the solder to the motherboard type, it has prongs, or pins, that come out of the bottom of the DC Power Jack, and goes through the motherboard. Then the prongs, or pins, are soldered to the motherboard.

With this style, if the DC Power Jack is bumped, the solder joints of those pins, may be cracked. Makes a bad contact.

Could also be bad enough to make a Short. (Laptop turns off when AC adapter is plugged in)

The DC Power Jack itself may be in bad repair.
Using as an example of the style that has a Center hole, and a surrounding cylindrical metal shell, (Inside), if the two parts touch, you can have a Short.

The diagnoses is to start with removing ALL power, AC adapter ('Natch), and Battery.
See with a small wooden object, if you can gently wiggle the DC Power Jack.

ANY perceptible movement means a bad DC Power Jack.
You will also have to partially disassemble the laptop, to check the DC Power Jack solder connections, to the motherboard.

3) DC Power Jack checks out, the problem has gone serious.

Mounted to the laptop motherboard is a power controller chipset.
It is a power MOSFET,

[ Chip and Chipset are slang terms for I.C.
Integrated Circuit,

http://en.wikipedia.org/wiki/Integrated_Circuit

The power MOSFET is a type of I.C.,

http://en.wikipedia.org/wiki/Power_MOSFET ]

If you open the laptop, and view the motherboard, this problem will be readily apparent. This chipset usually burns, and turns blackish.

Problem is when it does, the manufacturer's ID numbers are hard to read, in order to obtain a replacement ]

This is one power controller chipset that is used in a LOT of laptops,

https://docs.google.com/viewer?a=v&q=cache:oER5NNz8cwcJ:www.fairchildsemi.com/ds/FD/FDS6675BZ.pdf+Fairchild+FDS6675BZ&hl=en&pid=bl&srcid=ADGEEShOhWPjm_M-ROHme4iEMrztCTOd-28jNiy1hVLQQh_VOyv8zcXEVDB_iTQA6MuZO88UmRkDgjyW9j4CP2aIJ-4DS-h6JNM3lvxldeApQeecmz_DADCw1s7tmNLxfPknqX14SZP6&sig=AHIEtbS_rYUAeo_8rB9YHkW05ZjLqeH4Jg

This is another one,

http://html.alldatasheet.com/html-pdf/85156/VISHAY/SI4925BDY/183/1/SI4925BDY.html

Both of these chipsets uses a D2PAK surface mount.
The leads are bent into a J shape. ( J Lead)

The 'foot' of the J lead is soldered to a copper pad on the motherboard.
(Copper Pad has a thin gold plating on it)

Simple de-soldering/soldering techniques, are used to Remove the chipset.
HOWEVER, use a Heatsink on EACH J lead, when soldering the new chipset in.

http://www.radioshack.com/product/index.jsp?productId=2103242

(The power MOSFET has transistor/s inside )

OR, replace the motherboard.

For additional questions please post in a Comment.

Regards,
joecoolvette

Feb 12, 2012 | Computers & Internet

3 Answers

Laptop wont switch on even when charger plugged in


I recommend to him not to do it because him lapto it is possible to put in shortly and is not going to ignite

Aug 31, 2011 | Toshiba Computers & Internet

1 Answer

I got a compaq c36 it was working fine but now it wont switch on or anything do you now what it could be


1. Plug the laptop into AC power.

2. Take out the battery.

3. Try a different outlet.

4. Look for the light that indicates that the AC adapter is plugged in. If that light isn't on, try plugging and unplugging the AC power jack and moving it around until the light shows its connected. If no light comes on, its possible you have a bad DC jack or the AC adapter needs to be replaced.

5. If the indicator light is on and the laptop won't power on, then it's possible you have a bad switch board or stuck button. Make sure no buttons are stuck. Conversely, push hard on the power button and move it around in order to make sure you're making good contact.

6. If you know the battery has a charge, unplug the AC adapter and connect the battery. If it turns on, then you can be sure you have a bad DC jack or a bad AC adapter.

Mar 01, 2011 | Computers & Internet

3 Answers

Advent N270 netbook will not charge. Orange light comes on initially then goes off. Also when I wiggle the plug into the laptop the light flashes on and intermittently.


It sounds like either a bad connection on the motherboard or a broken wire in the adapter making intermittent connection.

1. With the power adapter disconnected, do you have a power light? This would indicate the adapter is good and the plug is questionable.

2. Check your power adapter output with a multi-meter.(be sure to wiggle the wires around) If the power fluctuates, replace the plug.

3. If the power is solid, replace the motherboard connector.

Nov 22, 2010 | Intel Computers & Internet

1 Answer

My D-Link Router was working OK for the last 3 years, I just removed the Cables to clean the work station and reconnected. (1) With proper connection Lights did not come -up in short no power to the...


If you plug the AC adapter into a live AC outlet and the correct port on the router the power light should come on. If it does not either your AC adapter has failed or the router itself. You do not need to connect anything else for it to power on.

If AC power checks out then you need the replace the AC adapter or router.

Oct 12, 2010 | D-Link DI 514 Wireless Router (DI-514)

1 Answer

Laptop will not come back on


Take the battery out of the laptop and only hook up the AC Adapter, if it turns on then that means the battery is shorted out and would need to be replaced.

If the laptop still doesn't turn on with just the AC Adapter, look to see if there is a LED Light on the AC Adapter, if the light isn't on when the adapter is plugged in then that means the adapter is bad and would need to be replaced.

If there is no LED indicator on your laptop then try another AC Adapter, if the laptop still doesn't turn on then that means your motherboard is bad and would need to be replaced.

Jun 01, 2010 | Panasonic Toughbook CF-73 Notebook

2 Answers

My HP PAillion ze2000 PC Notebook will not charge


I had this problem with my laptop and the way to solve it is.... guess!!
Get a new power cord!!

Dec 31, 2009 | HP Pavilion ze2000 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

Battery or ac adapter problems?


Sounds like you were cheated out of your money. Hopefully you just need to replace you Power Supply Cord and it will work fine because my guess it has broken wires and that caused the shutdown. If this does nit work, Your motherboard has been short circuited and this will never be fixed, it needs to be replaced and this is costly so it may be better to get whole new laptop. Buy a new Power cord and maybe a new battery if you feel you need to, but if they don't work, your laptop is dead

Nov 21, 2008 | HP Compaq Evo n610c Notebook

1 Answer

Sony Vaio ac adapter submerged


If the ac adapter was plugged into the laptop at the time may be bad news. Unplug AC adapter, take out the battery and hold power button for 10 seconds. Then connect AC adapter and hit power. If that doesn't work put battery back in without ac adapter and hit power button.

If neither test works bring to repair center for diagnosis. Best case AC adapter would need replacing. Worst case Motherboard fried.

Thanks

Mar 23, 2008 | Sony VAIO VGN-FS630/W Notebook

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