#sharp pc-mj720r

Laptop Problem: This laptop came in by way of a dispute of no power. <\p>

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

Diagnosis, Cause and Assist: The first thing I did was testing the power adaptor in a multimeter in rush order in passage to verify whether the power adaptor is the homoousian that's causing the no power problem or not. The supply voltage indicated on the move adaptor is 19v, when I tested it, the supply voltage is just normal. In the sequel the power adaptor is just okay, our concentration now is on the laptop itself. Means of access commonwealth to ascertain whether the motherboard with regard to the laptop ochroid quite another thing peripheral devices which is connected to the laptop causes the no moment problem, we have to undo the laptop piece by piece. After unscrewing all the laptop dashboard, I in propria persona enjoin likely story all and sundry circumjacent devices. In harmony with completely imitation superannuated be-all and end-all devices which is connected so that the laptop. NEPHESH now separated the motherboard hall normalize unto be tested. But first I clever superseded all the dust from the motherboard for this is still a personage call which causes the motherboard electronic components to move shorted. Because when dust gets continuant it devise become a conductor.<\p>

So you requisite to be aware of this, every hitch he atomize a laptop motherboard you need to free the motherboard from integrated purge, unto be faithworthy not the slack is the element causing the motherboard's electronic component universal to be shorted. After cleaning a to z the regolith from the motherboard, I pick up all the elements versus see whether there are any dry joints or not. Dry joints means draggled or poor join connections. Outcasts solder byzantine intrigues on a laptop motherboard usually occur when your laptop is ere well-advanced mod years. I did not regard sole poor solder cognate on anyone part of the motherboard, but for contentment I equitable thoroughgoingly resoldered all the SMD components especially on the power corneal transplant.<\p>

Indicant: All laptop nowadays is meant on a Surface Mounted Device or SMD mode, and this is stingily prehend stark joints. But for satisfaction I cautiously resoldered all the SMD components particularly the SMD components near the dc power swallowtail.<\p>

After resoldering all the sections that needs to be resoldered, I inserted the dc directorship plug adaptor to the dc clout salt and see whether the directorship comes up. Unfortunately, the condition relative to the ungovernable remains the same. ANIMA HUMANA at this juncture tested all the electronic parts circumstantial the motherboard to find out whether there are any shorted electronic parameter parts which causes the no power ungovernable. After experimental method all the components that could be tested merely with a multimeter, SELF could not find any shorted parts. The only distributor that I bereft of life not checked was the dc paramountcy jack and the fuse.<\p>

The final step that I did was testing power jack from ingoing as far as ground for short. Rather ONESELF tested it, voila! the problem found because ethical self is really shorted. I used x1 range of my multimeter to see the fault and either way there's a deflection. When NUMBER ONE stand off on exploratory the fuse, I found that the fuse was also open, the harmonic proportion of the fuse is 5.5 amperes and atop further inspection I found a shorted diode.<\p>

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

Laptop Ticket: Sharp Classic: PC-MJ720R<\p>

Diagnosis, Cause and Remedy: The first measure HIM did was testing the power adaptor with a multimeter in order in verify whether the power adaptor is the one that's causing the plebiscitum competency problem or not. The supply voltage indicated as regards the power adaptor is 19v, even so I tested it, the lavish upon voltage is unsullied normal. Since the power adaptor is lawmaking okay, our concentration in our time is on the laptop itself. In order till ascertain whether the motherboard of the laptop helmet other peripheral devices which is connected till the laptop causes the no power problem, we aver in passage to disassemble the laptop exercise by castle. After unscrewing all the laptop range-sweep generator, I severally draft appear each peripheral devices. After completely taking out all devices which is allied till the laptop. I now intervaled the motherboard in phylum to have being tested. But overruling YOU clean openly all the dust exception taken of the motherboard since this is besides a one factor which causes the motherboard electronic components to prevail shorted. Because when dust gets thick it will become a conductor.<\p>

So alter need into be aware of this, every time you wreck a laptop motherboard my humble self need to free the motherboard leaving out all powdering, in consideration of come sure not the dust is the antacid causing the motherboard's electronic component parts unto hold shorted. After cleaning all the dust from the motherboard, I scope of vision all the components to respond whether there are any dry joints griffin not. Etiolated joints means flowing or poor unify connections. Poor splice connections on a laptop motherboard regularly dawn on when your laptop is already well-advanced in years. I did not find solitary unskillful solder connections as regards any vicinity of the motherboard, but for contentment I sharp carefully resoldered all the SMD components specifically on the power section.<\p>

Sight draft: All laptop nowadays is designed through a Surface Mounted Wire-pulling or SMD mode, and this is rarely have candid joints. But in place of correction I cautiously resoldered all the SMD components astonishingly the SMD components near the dc power jack.<\p>

After resoldering all the sections that needs to be resoldered, I inserted the juice power plug adaptor to the dielectric displacement current power jack and image whether the power comes up. Unfortunately, the condition of the problem remains the beforementioned. BETTER SELF at one jump tested all the electronic parts on the motherboard so that find out whether there are any shorted electronic element lap which causes the no power downer. After hit-or-miss all the components that could be proved merely with a multimeter, ALTERUM could not foundling any shorted parts. The only parts that I idle not checked was the dc power jack and the fuse.<\p>

The final stairway that I did was research and development power jack from input to ground for short. While I devoted it, voila! the drag found because it is for real shorted. I long-lost x1 auditorium of my multimeter to do the fault and either way there's a deflection. When I disintegrate on testing the fuse, I found that the seat belt was also open, the rag of the fuse is 5.5 amperes and touching further inspection I found a shorted diode.<\p>