Pin – What Is It?
One of the most popular issues was screen dumb. If you begin to monitor the show under dark environment and get nearer to the screen you really could see the display but it was extremely dim. The perform of inverter board will be to create a a-c wave to power-up the lamps which was found at the very top and bottom . The inverter board wouldn’t light up the lamps and that which you could see only a faint display if it has problems.
I nonetheless could remember when I first encountered such problems long time past and because of dearth of advice, I wasn’t able to solve it. My repair friends were called up by me to asked about the remedy but no one capable to give me a solution. Due to this I have to do my own investigation to find the answer and I have never quit. Winston Churchill once said “Never, never, never give up”. I’m releasing the remedy simply to my devoted members or subscribers only-thanks for your support.
Let us start now! Once the the interior aluminum casing and the cover were opened ‘s saw 2 bulged filter capacitors at the secondary side of switch mode power-supply. The value was 1000 microfarad 25 volts and 470. ‘s saw four more electrolytic capacitors found at the inverter board have altered colour and also the value was 47 farad 25 volts. Browsing through the entire board with ‘s’ meter I found still another capacitor defective (220 uf 25 volts) which was near the fuse (3amp). Since this capacitor was located in the exact same line together with the fuse, I presumed that way may be given by the fuse too. True enough, with the ohmmeter revealed that the fuse has open-circuit assessing it.
Now, the serious issue faced by several electronic repairers who deals with this model was, after replacing the components above the LCD Monitor all still wouldn’t work-it’s nevertheless faint! First you will need to ask yourself why the fuse blown? Could it be a result of the defective capacitors or something shorted beyond the fuse line? The nearest circuit was the start circuit that consisted of a set of NPN and PNP digital transistor (4k7 4k7 resistor built into the transistor). Some other LCD monitor created used the combination of C945 and A733 in beginning circuit. From how the part number for Samsung 153V start circuit transistors were the A6J (PNP transistor that was electronic) as well as the A8J (NPN transistor) as revealed in the image.
Sometimes only these transistors have difficulties (shorted) that caused the fuse but in the above instance both electronic transistors are analyzed okay. Since both transistors were working, now the concentration need to maintain the four ic’s that generate the high-voltage transformers because the 12 volts voltage was supplying these ic ‘s to each. These 4 ic’s have many part numbers and the one that is most frequent that the manufacturer used was 4532m. The AD4E10 and BBD3N13 portion quantity was used by some board. At the moment it is quite difficult to get the data sheet or technical specification because of this number even from the internet search.
Do you know what is inside these IC’s? It is really some of P-station as well as an N-channel mosfet built into it. And can you understand that it might be evaluation with a meter? Yes, if you are using the atlas part analyzer that is Peak, it could prompt to you personally the result. In the result your acquisition are N channel FET located at pin 1 (source), pin 2 (gate), pin 7 & 8 (drain and both pins joint together). In the above test I discovered 2 of these ic’s have shorted. Replacing these two shorted IC with the capacitors and fuse put the LCD Monitor back to life!
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