Ram Dell

October 17th, 2010

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Repairing a Dell Notebook AC-Adapter

My Dell Notebook uses a power adapter that has an output voltage of 16V at 4.5A current. One day the adapter stopped working. I decided to try to repair the adapter. In the past I repaired several switching power supplies of PCs and also one AC-power adapter of a Asus notebook. I found out that most of the supplies had similar defects. Often they are ease to locate and to repair. This Instructable shows how to repair a Dell Notebook AC-Adapter but using the same principles it can work with any switching power supply. 1、Things needed AND SAFETY First of all you need the defective power supply … The you need a screw driver. It could be phillips type or a flat bladetype, depending on the power supply.In case of the Dell Notebookadapter you need a Dremel tool and a cutting disc too.To find out thedead parts you need a multimeter that contain… 2、Opening the case The Dell Notebook AC-Adapter ( Dell Inspiron E1505 AC Adapter )is not meant to be opened. The case is made of two plastic framespressed together and melted at the contact to one piece. To take itapart you need to cut the two halfes using a Dremel tool and a cuttingdisc. WAIT SOME MINUTES AFTER PULLING THE POWER CHORD FOR THECAPACITORS… 3、Examining and understanding … Start locating the parts of the power supply. We concentrate only ona few parts. I often found out that these are the most critical parts.Most swicth mode power supplies die when being switched on. At thatmoment a high current flows on the primary power side. You can see thatif you plug in th… 4、The Fuse Start with the fuse. Turn you multimeter to diode test (continuitytest) and put the test cables on both ends of the fuse. The multimetershould “beep” and show a very low voltage ( Dell Inspiron 1501 AC Adapter ). If that is the case the fuse is ok and need not be replaced. Otherwise you have to desolder the… 5、The Rectifier Next part in the chain is the rectifier. In nearly all cases I sawtil today there is a full bridge rectifier used. Here it is a flat onelocated near the power connector. Again use the diode test formeasurement. From underneath the printed circuit board you can reachthe rectifiers contacts ea… 6、The Capacitor Now use our Multimeter in diode mode to find out if the capacitorworks. Place the measuring pins on the pins of the capacitor and lookat the display while doing that. As soon as you place the pins thedisplay shows 0V. Then the voltage in the display starts growing andthe display shows infini… 7、Repairing After we found out what went wrong we can repair the power supply.If the capacitor is broken, desolder and replace it. I tried to findout if this was the only defect part and decided to do further testingbefore trying to buy a replacement. I did not have the capacitor thatwas used in the pow…

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Dell Poweredge R710 8 Bay 2 x QC 266GHZ 24GB RAM Select 300GB 15K drives
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Dell Poweredge R710 8 Bay 2 x QC 266GHZ 32GB RAM Select 300GB 15K drives
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Dell PowerEdge R720 1E5 2620 21TB SATA PERC H310 8GB Ram
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Dell Poweredge R710 8 Bay 2 x QC 266GHZ 96GB RAM Select 300GB 15K drives
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New 8GB 2x4GB Memory PC3 10600 DDR3 1333MHz Dell Inspiron One 2305 All in One
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Dell R720 PowerEdge Server 16 Bay 25 384GB RAM NVidia Graphics KVJ6K
Dell R720 PowerEdge Server 16 Bay 25 384GB RAM NVidia Graphics KVJ6K
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DELL Tower MT 4Core i7 34GHz CPU 12Gb RAM 750Gb HD MsOffice 2016 Win10 64Bit KB
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Dell SNPYXKF8C 16G PC3L SNPMGY5TC 16GWS 16GB 10600R 135v 2rx4 Memory Ram
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DELL LATITUDE E6430 CORE i7 3520M 29GHz 8GB RAM 320GB HDD WEBCAM WIN 10 PRO
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1GB RAM Module 400 LOW DENSITY MEMORY for Dell Optiplex gx260
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R730 Dell Pro Support Plus Wrty Thru 5 10 2021 2xE5 2660v4 28C H730P 32GB Ram
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