First to find out about the knowledge of the LCD , the LCD screen backlight system consists of three parts : Boost plate , backlight lamp , astigmatism board. Its working principle is to boost the low-voltage DC power board (about 12v) boost to a twenty -volt high-voltage , power supply to the backlight lamp , the light generated by the lamp through the plate astigmatism astigmatism , try to evenly projected onto a portion of each LCD , we can see the LCD screen display content. Astigmatism Astigmatism is a physical board , if that is a piece of frosted glass , basically no possible bad bad words only boost plate maximum likelihood and backlight lamp . Screen redness reason there may be damage caused by insufficient voltage step-up board or backlight lamp mercury vapor leak caused the leak , just as our fluorescent tube lamps sometimes appear as redness , but also the specific reasons after disassemble tests have to wait to know .

Demolition of books and desktop is not quite the same, should first removed the battery powered operation is very taboo . Then the hard drive should be removed, the books of the hard disk is very delicate , look ahead to protect , and so the weight will alleviate many of the books , it is also more convenient to split , by the way is also the books Guangruanhuhuan first light soft removed. The best find a small box used to hold the screws removed , I lost a screw , but fortunately not very important . There is a small book in mind about where to get what screws, there are few words will later install convenient , so you find on Bahrain and several screws not installed on the trouble. Well, the preparatory work is completed, following the demolition process is a formal , general demolition rule books are : The keyboard on the front panel , the LCD screen , the next panel , motherboard, this books is so, we must first be removed before the panel can Remove the LCD screen. Remove the top plate to pry it can be . Pick a small flat screwdriver or blunt mouth a little knife , slowly reached into the gap in the upper and lower panel , the panel will slowly pry , to pry open the lock when there will be a greater voice, do not worry, but remember not to use brute force , use Jin Qiao . In order to dismantle the LCD screen , but also to monitor the state of the books removed, or will it get in the way , Fujitsu has designed models are very mature , a series of books are like this, the more common is the fmv-450 fmv-475 fmv-575 fmv-5100, the appearance is the same. Well , no nothing prevents us dismantle the LCD screen , the following is the question . LCD panel also buckle up and down , and generally have screws , most of the books are four screws hidden in the bottom of the screen where the rubber cap , with a needle to pick open screw can see it. Remove the screws on the panel after the approach can be used to pry pry open the LCD panel up and down . Remove the panel, to reveal the internal structure of the LCD screen . Let us look carefully , the left green rectangle is the boost circuit board circuit board ; the middle is a white board astigmatism plate lamp , and now can not see the backlight lamp , because it is hidden in the astigmatism board upper end . Well, now we can use a multimeter to monitor what in the end is where the problem, note that is current, please pay attention to select the range. Interface is in the back , so the first step-up plate upside down , there is a small screw can be removed to turn over the step-up board . The top tube is the interface , let's test it , Hey, how there is no voltage , would not it, if the boost is difficult with broken plates , the instrument allows trouble, not right, the LCD screen is red It should also be said that many have little voltage . Carefully check, is not it, no power , I'm sorry I'm sorry, wasting everyone's feelings. Then market power , turn on the switch , voltage is 14,000 volts, lucky lucky , it should be no problem , ah, so it should be a question of the lamp . In this case a little easier to handle , because as far as I know, the lamp is better than a good buy more booster board . But there are many kinds of lamps , we will continue to go on to dismantle know what kind to buy . Unplug the backlight lamp plug , LCD screen is fixed with four screws on the board below , remove the screw on the LCD screen can be removed , be sure to note that the LCD screen is very delicate , then broke for a piece of crystal buy a laptop screen and the price is almost, it can get no play . Now or see the backlight lamp , as astigmatism or protection board , the lamp is easily damaged , so to special protection. Using a flat- tip screwdriver distinguished border protection LCD screen , you can separate the LCD screen and astigmatism board , be careful when you do this , and now the LCD screen without any protection is quite fragile, flat on the LCD screen a safe place , preferably covered with a clean sheet of paper , do not dirty , otherwise one would have a plaque installed to look good . The rest is astigmatism board , the lamp in the upper plate of astigmatism , this time the lamp is very brittle , split time a little careful , this is it , we spent a half-day strength is for this diameter of about 2 mm in length more than 20 cm of things, is not a little disappointed , very humble a small thing, but it took so much effort, but admire the craft manufacturer . This time can be further confirmed what will be re- connected to the boost panel lamp , boot ( do not forget to take the power ) , and sure enough , the lamp is really red, purple, confirmed. Well, here is buy a lamp, took out a tape measure about the length of the lamp , which the same lamp. First Mate and seen results, hey , Northeast talk - bright thief . Just press the record number of the order book and a small screw on the machine in the reverse order and then put back .

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