E151fpb LCD Monitor came in with complaint of no power, but to look carefully at the LCD screen is Dell could see a light (Blur) on flashes white and the light is off. Remove the cover was a bit 'easier than other models. As usual, when the main board and power board would be exposed to the area I would look for protruding obscured condenser, loosen and slide boards, etc. But, this monitor seems perfectly fine. The next Step was to separate the power / inverter with the motherboard. Power was applied to the PTO and I could hear a soft sound "chip-chip". When I measure the 12 volt cable with a digital multimeter, was the indication for 7-8 volts, which was very unusual. In fact, this is good news for us because we know what the next step for us.
Now we have a 12-volt car brake light bulb to see here the problem of low output voltage. If the> LCD Monitor Trailer Volt designed to operate at 18 or 24, then a light bulb on the willingness bigger. A faulty component in a primary or secondary site could lead to low output voltage. Remove the fuse, as shown in the picture and close the lamp between the supply line and the cold earth could say which section of problem. You could use this method, but first you must confirm that the secondary filter capacitors, TL431 adjustable precision shunt regulator ICOpto-isolators and works around the optocoupler components before using the light bulb go on.
If power to the lamp is on and still hear the sound was still. This suggests that the primary side of the problem and we can leave the inverter / high voltage area and fully searchable on the error in the main section.
This is the time to really test the capabilities of basic electronics, because now he knows what is in the range of errors andjust need to use your skills to find the exact faulty component. There was a lot of components on the primary, and you may easily verify, all in less than 20 minutes. After checking all the components I was surprised that they tested okay. Primary switch mode power transformer replaced rings 8 bar, which shows high and the PWM IC uc3842b power still does not work! It 's been quite difficult to solve this kind of thing where you are a hundredPercent sure that the main problem could not yet give the culprits.
As I reviewed all related components and was not the problem, the only way to do that I could replace direct semiconductor devices, such as diodes, scr, buffet, and transistors. I met breakdown of semiconductor devices when tested under full operating voltage. One by one I replaced the performance semiconductor components, and each time I changedwhen the lamp is on or not. Guess what, 'you would not believe what I just discovered a 2N7000 fet bad! The moments that I fet this power and replaced the lamp to light up immediately. I could not believe that this erroneous FET that causes all the drop in output voltages! I was so happy that I solved the problem and who knows, it could ultimately this is a flaw common to all E151Fpb Dell LCD monitor – so please note for all LCD monitorWorkshop.
I started checking with my meter broken 2N7000 FET analog electronics and Atlas Peak Analyzer and the result is always the same proven right! Just as the flyback, the best test equipment to test fat and other components of the device is in reality itself, because this is where the operating voltage, the frequency of the signal, and etc. What have you learned recently was that I suspect if all the components tested good, the only way to prove thatThe truth is the direct replacement parts. Hope this article and more articles are good every day! I wish you well and look forward to repair!
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