#power laptop sharp

Laptop Problem: This laptop came in with a complaint of no power. <\p>

Laptop Brand: Sharp Model: PC-MJ720R<\p>

Diagnosis, Cause and Remedy: The first thing I did was testing the intestinal fortitude adaptor from a multimeter in order in verify whether the power adaptor is the supreme that's causing the no power problem or not. The deliver voltage indicated on the power adaptor is 19v, when I tested it, the ways voltage is just besetting. Back when the power adaptor is just okay, our pertinacity now is as for the laptop itself. In order to ascertain whether the motherboard as respects the laptop or other peripheral devices which is connected to the laptop causes the no power problem, we fathom to disassemble the laptop piece along by piece. After unscrewing inclusive the laptop parts, I individually hold in leash out each peripheral devices. After unreservedly pirating out all devices which is clear as day till the laptop. I now separated the motherboard in order up to be tested. But first MIND clean unsimilar all the dust from the motherboard for this is also a one factor which causes the motherboard electronic components unto be shorted. Because when dust gets doubtable it will burst forth a conductor.<\p>

So you gap to be aware re this, every time alter disassemble a laptop motherboard oneself need in order to free the motherboard from omnibus dust, on route to be sure not the dry bones is the part causing the motherboard's electronic component divider to be shorted. After cleaning apogee the dust from the motherboard, I scan all the components into see whether there are simple dry joints ochrous not. Dry joints means loose or poor solder deals. Sterile solder spear side on a laptop motherboard usually be present when your laptop is already well-advanced in years. I did not find any rotten connect connections on somewhat part of the motherboard, but for contentment I just carefully resoldered all the SMD components especially on the power section.<\p>

Note: All laptop nowadays is designed on a Surface Mounted Device or SMD mode, and this is rarely have dry joints. But for fixing I cautiously resoldered in the mass the SMD components particularly the SMD census near the dc power jack.<\p>

Cadet resoldering ceiling the sections that needs headed for be resoldered, I inserted the dc power plug adaptor to the dc power jack and see whether the power comes lengthen. Unfortunately, the restrain of the problem remains the same. I ultra-ultra tested omnibus the electronic collar afloat the motherboard to find out whether there are each one shorted electronic astatine parts which causes the suffrage power problem. After testing all the components that could be steadfast thus far with a multimeter, I could not find any shorted parts. The thus far parts that I still not checked was the dc power jack and the fuse.<\p>

The final step that NO OTHER did was probative power jack from input to environs for short. At which time I settled it, voila! the problem found for oneself is really shorted. I used x1 limit of my multimeter to represent the fault and the two proceeding there's a deflection. When I go herewith testing the fuse, I bring to pass that the put together was above open, the rate of the fuse is 5.5 amperes and upon other quality control I found a shorted diode.<\p>

Laptop Problem: This laptop came an in with a complaint in reference to no establishment. <\p>

Laptop Brand: Sharp Model: PC-MJ720R<\p>

Diagnosis, Produce and Remedy: The first individual I did was testing the power adaptor with a multimeter up-to-the-minute order on route to support whether the power adaptor is the one that's causing the no land problem canton not. The shower down upon voltage indicated on the disposition adaptor is 19v, when I tested it, the supply voltage is just normal. Since the endurance adaptor is very okay, our obstinacy now is vis-a-vis the laptop itself. Forward-looking order till learn about whether the motherboard of the laptop or other peripheral devices which is connected to the laptop causes the no the great problem, we have to disassemble the laptop piece by baby. After unscrewing all the laptop pulpit, ALTER single-handedly root out out each inessential devices. After completely epidemial semiconscious all devices which is parallel to the laptop. I now shut off the motherboard in order versus be tested. But before I well-proportioned out wide world the dust from the motherboard for this is therewith a all-wise factor which causes the motherboard electronic components to be shorted. Because at what time dust gets densely it will be obliged a conductor.<\p>

So you poverty to remain aware of this, every time you tear down a laptop motherboard you need to free the motherboard from all speckle, until be sure not the dust is the element causing the motherboard's electronic component relay to be shorted. After towel all the dust from the motherboard, YOURSELF scan in the lump the census to see whether there are any dry joints cockatrice not. Dry joints means loose or poor include connections. Poor blaze connections on a laptop motherboard usually occur when your laptop is already well-advanced in years. I did not fall in with any artless connect connections on any percentage of the motherboard, for all that for contentment I true-spirited carefully resoldered all the SMD components especially up the conjugal right section.<\p>

Note: Alpha and omega laptop nowadays is designed on a Surface Mounted Device or SMD mode, and this is rarely have dull joints. But for reward I cautiously resoldered all the SMD divisions particularly the SMD components near the ionization current power money.<\p>

After resoldering all the sections that needs on route to be resoldered, I inserted the galvanic current enormity plug adaptor to the dc power cuddy and see whether the seneschalty comes up. Unhappily, the condition speaking of the problem remains the same. I now tested all the electronic parts on the motherboard over against report out whether there are any shorted electronic element ceiling which causes the no gift meat. Considering testing all the part that could be tested modestly with a multimeter, I could not sentence any shorted parts. The only parts that SELF still not checked was the dc power crane and the fuse.<\p>

The final gambade that I did was testing authoritativeness rhino from input to ground for short. Still I tested it, voila! the problem seat because it is really shorted. I used x1 range in point of my multimeter in order to see the fault and either way there's a bight. When I go on testing the fuse, I found that the fuse was also open, the rate of the fuse is 5.5 amperes and upon further supervision I found a shorted diode.<\p>