Laptop computers happen to be great portable offices, and with the spectacular advancement of technology and speeds of computers increase, we are surely going to perceive newer dimensions in which the saga of power supply will also assume a greater and more significant role. There is no oust that the laptop computers are the wave of the future. As we progress with better and better technology, they will get smaller, faster, and sleeker and design each and every year. Truly speaking, in our world today, the quality of a laptop is often measured only by its processor speed, memory capacity, and hard drive space and for gamers, the quality of the video card and lastly, the concept of power supply. Sometimes, the computer monitor will grab some attention, especially if it has an LCD screen. Seldom, however, do we think of a computer by its power supply. And seldom do we give them an upgrade, even if we have upgraded each and every other computer component.
When this very aspect is of such high significance it is necessary to be aware of the power supply repair safety. Since when the power supply is damaged or stops working, we have to think about it, or we have no computer period. The only solution is a power supply replacement. There is indeed the presence of a lot of computer power supplies available in computer shops, so in this respect finding one should not be difficult. The replacement of the power supply with a new unit should also be easy. The hard part is selecting the power supply that your computer needs. There are different kinds of power supplies and each has different specs. For your computer to work properly, it must be equipped with the right one. Till this it is okay. But if anyone or even you by mere accident cause a small amount current to flow through your or any other one's body, the concerned person may be highly damaged and even has to face death. Therefore when there is the need of any power supply repair there is a need to be alert. It is highly important to understand how electricity and power supply work, for which you can take all the precautionary measures to save you from getting electrocuted. Therefore, there are two basic things to consider whenever you are buying a new power supply for your computer -- power requirements and the power supply's form factor. It has been found by and large, that the power supplies of the modern age.
Modern power supplies have power outputs that range from 200 watts to 500 watts. Before purchasing a new power supply, you must first know the amount of power that each of your computer's components need. These power requirements can usually be found on the labels of the components themselves. By adding up these figures, you'll have a good estimate of the power output your new power supply should have. Therefore, as part of a general rule, it is not feasible to buy a power supply with output ratings that are lower than your estimates. On the other hand, at the same time, it is also not practicable to buy those that have too high a power rating, as most of this power would simply be wasted.
Well, when you or the concerned person concerned is destined to do all by yourself, it is necessary to wear rubber shoe and have an isolation transformer in your technical department or working area. Now if you have to check the hot section in a power supply, it is better to use the one hand 'rule' so that it would not complete a path for current to flows through your body just in case if you were to accidentally touched a live connection or cable. Now it may happen you are tired and weak and are no longer interested to repair any electronic equipment, refrain from working at once. Or else it may lead to or end up causing more problems for the equipment by replacing a wrong component. Take a break and come back to tackle the problem when you are fresh again. Well, these are the basic principles that we do follow as a highly professional organization, and also our employees when they become engaged in the power supply repair.
The next essential step is to select and use original part numbers at the time of replacement when dealing with components in the critical section such as the fuse area. Now if the fuse rating happens to be 3 ampere, there is the greater need of replacement with the same value which is 3 ampere. Well, at several occasions slightly higher ampere such as 3.15 ampere may be acceptable. But it is not practicable to use a 10 or 15 ampere for replacements. Why? If a 10 or 15 ampere is ever used, there shall be a high possibility of the sudden occurrence of fire due to over current because the fuse may not melt.
You shall have to be cautious at every occasion that the main filter capacitor with a high capacitance and voltage must be installed in the correct location. In addition, the positive marking at the capacitor must be inserted to the hole where it printed (+) and a negative marking to (-). If a filter capacitor is wrongly installed it cause the filter capacitor to explode and may injure your face if you are near to it. In some severed cases, the blown capacitor may burn the power supply as well, and there are good old examples regarding this.
Now, if it is concerned with the power supply of the 153V LCD then there is nothing to worry about, since this monitor came in with no power symptom. Now, if you are for the first time in a mood of repairing this type of power supply it is better to remove the switch mode power transformer. This imperative step can be followed by testing every single component in the primary section, before your continuation to check the secondary section. Are there any more requirements on your part regarding this very phase? You have to be good in testing basic electronic components in order to detect the fault. If you do not know the right way to check, you might miss out a bad component and this will lead you not able to solve the problem. When we were engaged in the process of similar type of checking, after checking with rapt attention all the components in the power supply section we found that the filter capacitor did not have any reading using digital capacitance meter (open) , the two round type fuse also open circuit, 1N4744 15 Volt zener diode short circuit and lastly the power ic TOP247F blown. Testing the switch mode power supply primary winding with a dick smith fly back tester showed green bar which indicated good winding. Now, was there that we left? Definitely there was something!
What we left here were the
secondary diode and filter capacitor. Upon checking them with analog meter
and ESR meter, found all of them to be good condition. Other area like
main board and inverter board also looked in a good condition (Power failure
rarely affecting these two circuits). Now we have confirmed that only
five components found to be faulty. One by one the components were replaced
(except one fuse) and just before you switch on the power supply, make
sure you connect a 100 watt light bulb across the live ac line-refer to
the photo at my website. Once it is done you can then proceed to switch
on the LCD monitor to look at the brightness of the bulb. Now if it happens
to be very bright, without any reason it can be said, that this is the
ample proof of the presence of short circuit, in whatever level, somewhere
in the power section. If it appears to be dim or totally goes off, it
is possible for you to place your red probe to the secondary side to check
if any dc present at their respective line. But with the presence of the
DC voltages at the output, it is obligatory for you to switch off the
power, discharge the filter capacitor (for safety purposes), remove the
light bulb and connect back the new fuse to its original location. This
makes you self-reliant and also boosts your confidence with the conviction
that the LCD power supply won't blow once you switch it on.
To conclude, whether you are repairing 153V LCD power supply or the mode
of power supply of any laptop, the procedure happens to be the same. Who
knows the power problem in this monitor is a common fault and in the future
you can tackle this brand of power supply in the shortest time. To measure
electronic components is not that difficult, but to get the original parts
like the power IC will consume you beyond doubt lots of time.
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Common
Problems:
Not
Booting
CPU BAD
Inverter
Keyboard/ Mouse Broken
Power Not Working Properly
Droped Laptop
Damaged LCD / Screen
Bad AC/Adapter
Memory issues
Dead Hard drive
Hinge Repair
Motherboard / System Board Issues
Spyware Problems
Spill Water
Slowing Down
Hard Drive Issues
Overheating
DC Jack Broken
Touchpad
System Restore
Virus
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Bios Problems
Drivers not working
Power Problems, loose connections.
CDRW , DVD and CD-Rom Problems
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