A Samsung LA40N81B that has been sleeping for half a year has finally woken up - News - Global IC Trade Starts Here - ICEach.com

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In March of this year, I took a Samsung LA40N81B LCD TV. The fault is a black screen with a sound. When the teardown is found, the backlight is bright when the black screen is detected. The voltage of each group of the power board is normal. Then the voltage of the VCC supply terminal of the logic board is 0 volts. Measure the logic board VCC end to ground forward and reverse resistance is normal, dial the line at the end of the logic board, the measurement is still 0 volts, it is judged that the motherboard is broken, the LCD motherboards repaired in the past are components on the front of the board, and this There are components on both sides of the motherboard, the wiring is dense, the repair is difficult, it is decided to buy a motherboard to replace, the motherboard model is BN41-00839D, the Internet search does not have this type of motherboard to sell, Samsung LA40N81B according to the different screens have several models Motherboard, other models of the motherboard are also only second-hand disassemble, only a few have goods, can only wait, wait for more than half a year or no such model of the motherboard, the recent business is light, it seems that buying a motherboard has no hope I decided to die as a living horse doctor. I got older glasses and a magnifying glass. I followed the VCC power supply terminal to the motherboard. Finally I found an 8-foot patch on the motherboard. The model number is 4435B. It is controlled by it. The board VCC power supply, do not know what component is 4435B, the Internet search found 4435B is the FET, 4435B has 8 feet, 1, 2, 3 feet are connected to the S end, 4 feet are the G end, 5, 6, 7,8 feet are connected to the D end, measure the positive and negative resistance between S, G, D3, find a short circuit between S and G, weld the 8-pin G-end, and then measure the resistance between S and G. , indicating that 4435B is good, and later found that S, G between a chip capacitor short circuit, the bit number can not see clearly, because I do not know the capacity of this chip capacitor, decided to try from small to large, the first One installed 100P, the sound of ticking and ticking at the start, measure the voltage of the 4435B D terminal 2-10 volts. When installing a 100V100n (100V0.1UF), the sound of the ticking is not turned on, and then the D end of the 4435B is measured. There is 13 volts, plugged in, the TV is completely normal, sorry, I will not upload pictures.