Pin – Is it a Scam?
Pin – Is it a Scam?
Among the common problems in Samsung 153v LCD Monitor was screen dense. Should you get closer to the screen and start to observe the show under environment that is dark the show could be really seen by you but it was quite faint. Should you press the front-panel button, the on screen display (OSD) would appeared and this proof the issue is in the inverter board and also the primary board, driver board and liquid crystal display panel is operating. Inverter board’s perform will be to create an ac wave from dc voltage to switch on the lamps which was located towards the top and base of the LCD Monitor. If the inverter board has problems it wouldn’t light up the lamps and exactly what you could see merely a faint display.
When I first encountered such difficulties long time ago and because of insufficient – http://Www.Twitpic.com/tag/insufficient information, I nonetheless could remember, I wasn’t able to solve it. My repair buddies were called up by me to asked about the option but no one competent to give an answer to me. Due to this I must do my own research to find the answer and I’ve never give up. I’m releasing the solution just to my faithful members or subscribers only-thanks for the support.
Let’s begin now! After the the interior aluminum casing and the cover were opened I saw 2 bulged filter capacitors at the secondary side of switch-mode power-supply. The value was 470 and 1000 microfarad 25 volts. ‘s saw four more electrolytic capacitors found in the inverter board have altered colour and also the value was 4-7 micro farad 25 volts. Browsing through the whole board with my ESR meter I found still another capacitor faulty (220 uf 25 volts) which was near the fuse (3amp). I presumed the fuse may give way, since this capacitor was located in precisely the same line with all the fuse. True enough, with an ohmmeter revealed that the fuse has open-circuit assessing it.
Now, the serious problem faced by many electronic repairers who deals with this model after changing each of the components above the LCD Monitor still wouldn’t work-it is still faint! First you have to ask yourself why the fuse blown? Could the faulty capacitors or something cause it? The nearest circuit to the fuse was the beginning circuit that consisted of a set of PNP and NPN digital transistor (4k7 4k7 resistor built to the transistor). Some other LCD monitor designed used the mixture of A733 and C945 in start circuit. By how the part quantity were the A6J (PNP digital transistor) as well as the A8J (NPN digital transistor) as shown in the picture.
Occasionally just these transistors have problems (shorted) that caused the fuse however in the above mentioned case both electronic transistors are analyzed fine. Since both transistors were operating, now the focus must be in the four ic because the 12 volts voltage was providing to each of the ic’s ‘s that generate the high voltage transformers. These 4 ic’s have the one that is most common and also many component numbers that the producer used was 4532m. At this time it is fairly difficult to get the datasheet or technical specification because of this number even in the internet search.
Have you any idea what’s inside these IC’s? It’s in fact some of P-channel and an N-channel mosfet assembled into it. And would you realize – http://imgur.com/hot?q=realize that it could be test using a meter? Yes, if you are using the atlas part analyzer, it would prompt to you the outcome. From the result your acquisition are N channel FET found at pin 1 (source), pin 2 (gate), pin 7 & 8 (drain and equally pins together). In the above evaluation I found two of those ic’s have shorted. The LCD Monitor is set by replacing IC shorted with fuse and the capacitors back alive!
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