Bridge Type Diode
Bridge Type Diode
How to repair HP Pavilion DV5t AC Adapter
My hp notebook uses a HP Pavilion DV5t AC Adapter(http://www.usadapter.com/Laptop-HP-Adapter/HP-Pavilion-DV5t-AC-Adapter.html) that has an output voltage of DC18.5V 3.5A. One day the hp AC 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 hp AC Adapter but using the same principles it can work with any Switching Power Supply.
First of all you need the defective power supply.You need a screw driver. It could be phillips type or a flat blade type, depending on the power supply.
To find out the dead parts you need a multimeter that contains a continutiy and a diode test.
Having a soldering iron and and some pliers is also helpful when replacing parts.
step 2 Opening the case
The HP AC Adapter(http://www.usadapter.com/Laptop-HP-Adapter/) is not meant to be opened. The case is made of two plastic frames pressed together and melted at the contact to one piece.
step 3 Examining and understanding .
Start locating the parts of the laptop ac adapter. We concentrate only on a few parts. I often found out that these are the most critical parts. Most swicth mode power supplies die when being switched on. At that moment a high current flows on the primary power side. You can see that if you plug in the power chord and have a look at the socket. Sometimes you can see sparks that are caused by the high current.
step 4 The Fuse
Start with the fuse. Turn you multimeter to diode test (continuity test) and put the test cables on both ends of the fuse. The multimeter should “beep” and show a very low voltage (3mV on the picture). If that is the case the fuse is ok and need not be replaced. Otherwise you have to desolder the fuse and put in a new one.
step 5 The Rectifier
Next part in the chain is the rectifier. In nearly all cases I saw til today there is a full bridge rectifier used. Here it is a flat one located near the power connector. Again use the diode test for measurement.
step 6 The Capacitor
Now use our Multimeter in diode mode to find out if the capacitor works.
Place the measuring pins on the pins of the capacitor and look at the display while doing that. As soon as you place the pins the display shows 0V. Then the voltage in the display starts growing and the display shows infinite. Exchange the measuring pins. The same thing happens again. If you are using a multimeter that has got a beeper, you can hear a short beep when connecting the pins.
step 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 find out if this was the only defect part and decided to do further testing before trying to buy a replacement. I did not have the capacitor that was used in the power supply and had to use a near replacement.
If using other capacitors than the original ones you have to respect some rules in order not to burn some things down.
About the Author
Usadapter.com locates in Santa Clara. We are here to help you obtain the best quality lowest priced laptop ac adapters, car chargers and LCD adapters. We specialize in those hard to find accessories and specialty items. This is why we have a huge selection and specific ac adapters. With our great selection you are sure to find ac adapters you need compatible with those famous brands such as DELL, IBM, COMPAQ, TOSHIBA, SONY, APPLE, FUJITSU SIEMENS, ACER, HP, LG, SAHARA & MECER etc. However, if you can’t find what you are looking for give us an email we would love to find it for you.
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