Transistor Npn
Todays deals on Transistor Npn?
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JANTX2N2814 Mil Spec Power NPN Transistor 2N2814 $995.00 |
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20 Toshiba NPN 2SC2879 C2879 Power Amplifier Transistor $999.99 |
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20 Toshiba NPN 2SC2879 C2879 Power Amplifier Transistor $999.99 |
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20 Toshiba NPN 2SC2879 C2879 Power Amplifier Transistor $999.99 |
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20 Toshiba NPN 2SC2879 C2879 Power Amplifier Transistor $999.99 |
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20,Toshiba NPN 2SC2879 C2879 Power Amplifier Transistor $999.00 |
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1000, Audio Power Transistor NPN MJ15003 BY MOT TO-3 $974.00 |
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10,Toshiba NPN 2SC2879 C2879 Power Amplifier Transistor $547.00 |
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PACK20, Mitsubishi 2SC5125 C5125 NPN RF VHF Transistor $545.00 |
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500x NPN 2SC2312 C2312 Transistor for amplifier output $536.00 |
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20,Mitsubishi NPN 2SC2694 C2694 RF Power Transistor m $525.00 |
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10x MRF454 NPN RF Transistor for Power Amplifier MOT m $518.00 |
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10pcs, MRF422 RF Line NPN Silicon RF Power Transistor $513.00 |
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10 Motorola MRF422 Line NPN Silicon RF Power Transistor $511.99 |
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10 Motorola MRF422 Line NPN Silicon RF Power Transistor $511.99 |
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10 Motorola MRF422 Line NPN Silicon RF Power Transistor $511.50 |
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10 Motorola MRF422 Line NPN Silicon RF Power Transistor $511.50 |
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10PCS MRF454 NPN RF Transistor for Power Amplifier MOT $508.00 |
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1000x BC108B Transistors / NEW / NPN Audio Fuzz Face / Metal Case BC108 $499.99 |
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20X Mitsubishi NPN 2SC2694 C2694 VHF RF Amp Transistor $499.00 |
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500,NPN 2N3773 Audio Power AMP Transistor TO-3 MOTOROLA $488.00 |
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500, Audio Power AMPS Transistor NPN 2N3773 BY MOT TO-3 $480.00 |
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100PCS Original 2SC1969 C1969 NPN Transistor NEW $450.00 |
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SURFACE MOUNT NPN TRANSISTOR #SMBTA06 – 30,000PCS $450.00 |
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100pcs, MJH16018 NPN Horizontal Output Transistor $449.00 |
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8,Motorola MRF422 Line NPN Silicon RF Power Transistor $440.00 |
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10 pieces MOTOROLA NPN MRF1946 RF Transistor $428.00 |
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10 pieces MOTOROLA NPN MRF1946 RF Transistor $428.00 |
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10 pieces MOTOROLA NPN MRF1946 RF Transistor $428.00 |
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200, NPN MJ16022 High Power Transistor TO-3 MOTOROLA $416.00 |
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200pcs, MJ16022 NPN High Power Transistor TO-3 Motorola $415.00 |
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TOSHIBA 2SC5411 TRANSISTOR SILICON NPN TRIPLE DIFFUSED MESA TYPE – 750 PCS NEW $399.00 |
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PKG200, MOTOROLA NPN Power Transistor MJ16018 TO-3 $410.00 |
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PKG200, MOTOROLA NPN Power Transistor MJ16018 TO-3 $405.00 |
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BLV32F Philips-NPN RF POWER 10W 25V TRANSISTOR 10 pcs $385.00 |
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20,Mitsubishi NPN 2SC3102 C3102 RF Power Transistor $399.00 |
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20pcs Mitsubishi NPN 2SC3102 C3102 RF Power Transistor $398.88 |
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20pcs Mitsubishi NPN 2SC3102 C3102 RF Power Transistor $398.00 |
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20pcs Mitsubishi NPN 2SC3102 C3102 RF Power Transistor $398.00 |
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20pcs Mitsubishi NPN 2SC3102 C3102 RF Power Transistor $398.00 |
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200, Audio Power Transistor NPN MJ21196 BY MOT TO-3 NEW $394.00 |
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20PCS 2SC2101 C2101 NPN RF VHF Amplifier Transistor $388.00 |
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20PCS 2SC2420 C2420 NPN RF VHF Amplifier Transistor $388.00 |
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20PCS 2SC2420 C2420 NPN RF VHF Amplifier Transistor $388.00 |
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20PCS 2SC2101 C2101 NPN RF VHF Amplifier Transistor $388.00 |
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20PCS 2SC2101 C2101 NPN RF VHF Amplifier Transistor $388.00 |
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20PCS 2SC2420 C2420 NPN RF VHF Amplifier Transistor $388.00 |
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20PCS 2SC2420 C2420 NPN RF VHF Amplifier Transistor $388.00 |
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20PCS 2SC2101 C2101 NPN RF VHF Amplifier Transistor $388.00 |
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10PCS MRF454 NPN RF Transistor for Power Amplifier (W13) $388.00 |
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10x Mitsubishi NPN 2SC2094 C2094 RF VHF Amps Transistor $377.00 |
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MRF581 RF NPN Transistor MOTOROLA LOT OF 100 $375.00 |
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200x BU508A High Voltage Current NPN Transistor NEW m $367.00 |
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200pcs, NPN MJ16020 High Power Transistor TO-3 MOTOROLA $365.00 |
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200pcs, MJ16020 NPN High Power Transistor TO-3 Motorola $360.00 |
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200PCS, Audio Power Transistor NPN MJ15024 BY MOT TO-3 $336.00 |
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10x Toshiba NPN 2SC2782 RF VHF Amplifier Transistor $335.00 |
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10x Toshiba NPN 2SC2782 RF VHF Amplifier Transistor m $334.00 |
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10,000 FAIRCHILD NPN GEN’L PURPOSE AMPLIFIER TRANSISTOR $325.00 |
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5PCS,BLV32F 10W NPN RF POWER Transistor UK 0304 $325.00 |
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10, Mitsubishi NPN 2SC2905 C2905 VHF RF Amp Transistor $319.00 |
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10 TOSHIBA 2SC2099 C2099 NPN Power Amplifier Transistor $318.00 |
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10 TOSHIBA 2SC2099 C2099 NPN Power Amplifier Transistor $318.00 |
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10pcs, Mitsubishi NPN 2SC2630 C2630 RF Power Transistor $312.00 |
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Central Semiconductor MPQ2222A Silicon NPN Transistor Lot of 322 IC’s $299.00 |
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5x SD1446 TRANSISTOR NPN RF BIPO UHF M113 $250.00 |
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PACK10,2N6080 NPN Microwave RF Transistor $288.00 |
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5PCS, MRF454 NPN RF Transistor for Power Amplifier MOT $288.00 |
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5 Toshiba NPN 2SC2879 C2879 Power Amplifier Transistor $277.00 |
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5 Toshiba NPN 2SC2879 C2879 Power Amplifier Transistor $277.00 |
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5 Toshiba NPN 2SC2879 C2879 Power Amplifier Transistor $277.00 |
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10 X MITSUBISHI 2SC5125 C5125 NPN RF VHF TRANSISTOR NEW $277.00 |
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10 X MITSUBISHI 2SC5125 C5125 NPN RF VHF TRANSISTOR NEW $277.00 |
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10 X MITSUBISHI 2SC5125 C5125 NPN RF VHF TRANSISTOR NEW $277.00 |
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5 Toshiba NPN 2SC2879 C2879 Power Amplifier Transistor $277.00 |
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10 X MITSUBISHI 2SC5125 C5125 NPN RF VHF TRANSISTOR NEW $277.00 |
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5x Toshiba NPN 2SC2879 C2879 Power Amplifier Transistor $276.00 |
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10x Mitsubishi 2SC5125 C5125 NPN RF VHF Transistor m $276.00 |
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PACK10, Mitsubishi 2SC5125 C5125 NPN RF VHF Transistor $275.00 |
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200,NPN 2N3773 Audio Power AMP Transistor TO-3 MOTOROLA $274.00 |
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5PCS MRF454 NPN RF Transistor for Power Amplifier MOT $270.00 |
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200, Audio Power AMPS Transistor NPN 2N3773 BY MOT TO-3 $270.00 |
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5PCS MRF454 NPN RF Transistor for Power Amplifier MOT $270.00 |
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10000 PCS 2N4401 TO-92 NPN switching transistor NEW /Free Registered Mail $269.99 |
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10, Mitsubishi NPN 2SC2694 C2694 VHF RF Amp Transistor $268.00 |
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150, Audio Power Transistor NPN MJ21194 BY MOT TO-3 $264.00 |
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150 PCS BU508 BU508A TO-3P NPN POWER TRANSISTOR $262.99 |
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5pcs, MRF422 RF Line NPN Silicon RF Power Transistor $260.00 |
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8000 PCS MMBT3904 1AM SOT-23 2N3904 SMD NPN transistor /FREE registered mail $259.99 |
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5 Motorola MRF422 Line NPN Silicon RF Power Transistor $258.98 |
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5 Motorola MRF422 Line NPN Silicon RF Power Transistor $258.98 |
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5 Motorola MRF422 Line NPN Silicon RF Power Transistor $258.50 |
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5 Motorola MRF422 Line NPN Silicon RF Power Transistor $258.50 |
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10pcs, NPN 2SC2695 C2695 UHF Power Amplifier Transistor $257.00 |
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Philips 9GHz NPN RF Transistor BFG540/X, New, 3000pcs $254.99 |
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10X Mitsubishi NPN 2SC2694 C2694 VHF RF Amp Transistor $250.00 |
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5x Toshiba NPN 2SC2879 C2879 Power Amplifier Transistor $249.00 |
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1000x 2SC3357-RF C3357 SOT-89 NPN Silicon RF Transistor $246.99 |
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10000 PCS BC817-25 SOT-23 NPN general purpose transistor /FREE Registered Mail $244.99 |
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200, Audio Power Transistor NPN MJ15003 BY MOT TO-3 $242.00 |
Transistor Npn Questions
Repairing Samsung 153V LCD Monitor With Dim Display Problem
One of the common problems in Samsung 153v LCD Monitor was display dim. If you get closer to the screen and begin to observe the display under dark environment you actually could see the display but it was very dim. If you press the front panel button, the on screen display (OSD) would appeared and this proof that the main board, driver board and LCD panel is working and the problem is in the inverter board. The function of inverter board is to generate an ac wave from dc voltage to power up the lamps which was located at the top and bottom of the LCD Monitor. If the inverter board has problems it would not light up the lamps and what you could see only a dim display.
I still could recall when I first encountered such problems long time ago and because of lack of information, I could not solve it. I did call up my repair friends to asked about the solution but no one able to give me an answer. Even if you surf the internet for “Samsung 153V LCD Monitor dim display repair”, you would not find it. Due to this I have to do my own research to find the answer and I’ve never give up. Winston Churchill once said “Never, never, never give up”. I’m releasing the solution only to my loyal members or subscribers only-thanks for your support.
Let’s start now! Once the cover and the internal aluminum casing were opened I saw two bulged filter capacitors at the secondary side of switch mode power supply. The value was 470 and 1000 microfarad 25 volts. I saw four more electrolytic capacitors located at the inverter board have changed color and the value was 47 micro farad 25 volts. Browsing through the whole board with my ESR meter I found another capacitor faulty (220 uf 25 volts) which was near the fuse (3amp). Since this capacitor was located at the same line with the fuse, I presumed that the fuse may give way as well. True enough, checking the fuse with an ohmmeter revealed that it has open circuit.
Now, the real problem faced by many electronic repairers who deals with this model was, after replacing all of the components above the LCD Monitor still would not work-it’s still dim! First you have to ask yourself why the fuse blown? Could it be caused by the defective capacitors or something shorted beyond the fuse line? The nearest circuit to the fuse was the start circuit that consisted of a pair of NPN and PNP digital transistor (4k7 +4k7 resistor built into the transistor). Some other LCD monitor designed used the combination of C945 and A733 in start circuit. By the way the part number for Samsung 153V start circuit transistors were the A6J (PNP digital transistor) and the A8J (NPN digital transistor) as shown in the picture.
Sometimes only these transistors have problems (shorted) that caused the fuse to blow but in the above case both digital transistors are tested okay. Since both transistors were working, now the concentration have to be in the four ic’s that drive the high voltage transformers because the 12 volts voltage was supplying to each of these ic’s. These 4 ic’s have many part numbers and the most common one that the manufacturer used was 4532m. Some board used the AD4E10 and BBD3N13 part number. At the moment it is quite hard to get the datasheet or technical specification for this number even from the web search.
Do you know what is inside these IC’s? It is actually a pair of P-channel and a N-channel mosfet built into it. And do you know that it can be test with a meter? Yes, if you use the Peak atlas component analyzer, it would prompt to you the result. From the result what you get are N channel FET located at pin 1 (source), pin 2 (gate), pin 7 & 8 (drain and both pins joint together internally). As for P channel FET, pin 3 (source), pin 4 (gate) and pin 5 & 6 (drain and both pins joint internally). From the above test I found two of these ic’s have shorted. Replacing these two shorted IC with the capacitors and fuse put the LCD Monitor back to life!
One more thing I would like to share on this model was that the inverter PWM IC BIT1305 was quite robust and rarely gave problem.
About the Author
Find out more at the links below. You will be very surprised to discover that LCD and Electronic Component Repairs can make thousands of dollars even for a novice. You can find out the repairing secrets.
Find out How to Repair Any LCD Monitor – It is a breeze!
Learn about Secrets of Electronic Repairs.
Transistor Npn Videos
Medida Transistor NPN
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