One of the common problems in Samsung 153V LCD monitor display is dim. If you are closer to the screen and begin to see in a dark environment that you would actually see the screen, but was very weak to observe. Pressing the front panel is pressed, the On Screen Display (OSD) was published and this is proof that the motherboard, LCD panel and driver board, and the problem is the inverter board. The function of the inverter board is a wave of AC voltage to generate energylight that was at the top and bottom of the LCD monitor. If problems converter board would not light the lamp and you could only see a faint display can.
I could still remember when I first of these problems long ago and encountered a lack of information, I could not solve. I called my friends asked for the repair solution, but not able to give me an answer. Although surfing the Internet for "Samsung 153V LCD Monitor repair dim"would not find it. Thanks to this I have my quest to find the answer to do and I never give up. Winston Churchill once said, "Never, never, never give up." They are issued only for my loyal subscribers, or just thank you for your support.
Let's start now! Once the lid and the inner aluminum container were opened I saw two bulging capacitors on the secondary side power switching. The value is equal to 470 and 1000 microfarad 25 volts. I saw fourelectrolytic capacitors on the circuit board inverter have changed color and the value was 47 micro farad 25 volts. Navigating through all the card with my ESR meter I found another faulty capacitor (220 uf 25 volt), which was near the fuse (3A). Since this capacitor is on the same line with the fuse, I suspect that the fuse can be different. True enough, checking the fuse with an ohmmeter showed that the open circuit.
Now the real problem of many electronicrepairers do with this model was, after replacing all the parts above the LCD monitor still does not work is still weak! Before you wonder why the fuse blown? It could be caused by defective capacitors or something short line fuse? The nearest track was the start of the fuse circuit comprises a pair of NPN and PNP digital transistor (4 k7 4k7 resistor built-in transistor). Some other LCD monitor is designed for the combination of C945A733 and the starting circuit. Among other things, the part number for Samsung 153V reset transistor circuit were A6J (PNP digital transistors) and the A8J (Digital NPN transistor), as shown in the figure.
Sometimes these transistors only have problems (short), which caused the fuse to blow, but in the above case both digital transistors are tested well. Since both transistors worked, as the concentration should be the four chips that drive the high voltage transformers since 1912volts was supplied to each of these chips. 4 These chips are a lot of part numbers and the most common, the manufacturer was 4532m. Some board used BBD3N13 AD4E10 and part number. At present it is very difficult datasheet or technical specifications of this number to get, even from the Web for research.
You know what's inside these chips? It is actually a pair of P channel MOSFET and an N-channel built. And you know that you can test with a meter? Yes, ifYou use the Peak Atlas Component Analyzer, the result would have asked. The results obtained are N-channel FET is on pin 1 (source), pin 2 (port), the pin 7 and 8 (exhaust and two pins together internally). As for the P-channel FET, pin 3 (source), pin 4 (port) and pin 5 and 6 (both internally and shared drain pin). From the above test I found two of these chips are shorted. Replacement of these two IC circuit with the capacitors and put the fuse LCD monitorLive!
One thing I'd like to share this model was that the PWM inverter IC BIT1305 was very robust and rarely has problems.
Jestine Yong is a electronic repairer and a writer for LCD monitors and other electronic repair information, visit his website at http://www.electronicrepairguide.com/lcd-monitor-repair.html
My Links : Hard Wood Floor Buy Chill Store Sympathy Plants
No comments:
Post a Comment