Do with Samsung 153V LCD screen with dim screen

One of the most common problems in the Samsung 153v LCD screen was to show small. If you close the screen and start watching the screen under a dark environment, you could see the screen but it was very small. Pressing the button on the front panel displays the OSD and this proof that the main board, control panel and LCD panel work and the problem is in the inverter table. The function of the inverter of the board is to create an AC wave from DC voltage to power up the lamps that were located at the top and bottom of the LCD screen. If the inverter counter is in trouble it would not turn on the lights and what you could see only a dark display.

I could still remember when I encountered such problems a long time ago and because of the lack of information I could not solve it. I called my repairers to ask for the solution, but no one can answer me. Even if you browse the internet for "Samsung 153V LCD screen dark screen repair", you would not find it. Because of this, I have to do my own research to find the answer and I have never given up. Winston Churchill once said, "Never never never give up". I only release the solution to my loyal members or subscribers – thanks for your support.

Let's start now! When the cover and the inner alloy cover were opened, I saw two resistant filter covers on the upper side of the switch. The value was 470 and 1000 microfarad 25 volts. I saw four more electrode capacitors located on the inverter table has changed the color and the value was 47 micro farad 25 volts. Browsing through the entire desk with my ESR meter, I found another flawed 220 volt 25 volt close to security (3amp). Since this capacitor was located on the same line with security, I assumed that security can also be delivered. True enough, checking safety with ohmmeter revealed that it has an open circuit.

Now there's a real problem that many electronics, which deal with this type that are facing, after replacing all the components above the LCD screen would still not work-It's still dark! First, you need to ask yourself why the security blows? Could it be caused by defective capacitors or something short of safety? The next cycle of security was the starting point consisting of pairs of NPN and PNP digital transistors (4k7 + 4k7 resistor built-in transistor). Some other LCD screens designed used a mixture of C945 and A733 in the initial cycle. By the fact that the part number for Samsung 153V starts the circuit details were A6J (PNP Digital Transmitter) and A8J (NPN Digital Transmitter) as shown in the picture.

Sometimes only these short-term problems (short) have caused safety to blow, but in the above cases, both digital mirrors are tested correctly. Since both transistors were working, the strength needs to be in four ICs that run high voltage transformer because 12 volt voltage was given to each of these ICs. These 4 cc have many parts and the most common used by the manufacturer was 4532m. Some tables use the AD4E10 and BBD3N13 part number. At the moment, it is very difficult to get data sheets or technical specifications for this number, even from the web search.

Do you know what's inside these ICs? It's actually a pair of P-channel and N-channel mosfet built in it. And do you know that it can be tested by meters? Yes, if you use the high-end diagnostic device, it will lead to results. Of the result you get, N-channel FET is located on pin 1 (source), pin 2 (side), pin 7 and 8 (drain and both pins join together). As for P channel FET, pin 3 (socket), pin 4 (side) and pin 5 & 6 (drain and both internal pins). From the above tests, I found that two of these icum have supported. To replace these two shorter ICs with tight and secure devices, turn the LCD back on to life!

One that I would like to share with this model was that the inverter PWM IC BIT1305 was very strong and rarely gave a problem.

Jestine Yong is an electronics and writer for electronic and LCD MONITOR repair information, please visit his website at [19659009]

Source by Jestine Yong

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