Power Mosfet
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3Pcs 900V 5A 2SK2651 Power MOSFET N-Channel Transistors $5.29 |
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FMH07N90G 7A 900V N-Channel Power MOSFET Transistor TO-3P $4.00 |
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Lanzar – VBP261 – 3500 Watts 2 Channel High Power MOSFET Amplifier $119.99 |
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20A 500V IRFP460A Through Hole SMPS Power MOSFET Transistor $5.52 |
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FMH07N90G 7A 900V N-Channel Power MOSFET Transistor TO-3P $4.04 |
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HIFONICS GLX1000.1D 1000 WATTS MONOBLOCK CLASS D CAR MOSFET POWER AMPLIFIER $197.15 |
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IRFPF50 5A 900V Central Mounting Hole Power MOSFET $5.43 |
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IRFM9240 IRFM-9240 Power MOSFET GOLD Transistor M9240 $25.99 |
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IRFM340 IRFM-340 Power MOSFET GOLD Transistor M340 $19.99 |
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IRFM040 IRFM-040 Power MOSFET GOLD Transistor M040 $19.99 |
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Pyle Pla-2230 3000 Watts 2 Channel High Power Mosfet Amplifier (pla2230) $124.64 |
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SSSP45N20A Power MOSFET N-channel Transistor 200V 45A $7.74 |
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2SK2141 SWITCHING N-CHANNEL POWER MOS FET $2.75 |
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IXFX52N60Q2 N Channel Power MOSFET Transistor 600V 52A $12.06 |
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5Pcs IRF640 Power MOSFET N Channel 18A 200V TO-220AB $6.02 |
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BLACKMORE MONOBLOCK 2000W MAX MOSFET POWER CAR SUBWOOFER AMPLIFIER W/ BASS KNOB $118.15 |
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IXFK48N50 N-Channel Power MOSFET Transistor 500V 48A $14.18 |
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KENWOOD SPORT SERIES 4-CHANNEL 500W MAX CLASS AB MOSFET POWER SPEAKER AMPLIFIER $112.15 |
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3 Pcs STP40NF12 N-Channel Power MOSFET 40A 120V TO-220 $4.92 |
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POWER ACOUSTIK BAMF SERIES 1250W MAX CLASS AB 2-CHANNEL MOSFET SPEAKER AMPLIFIER $118.15 |
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Power MOSFET 47N60 600V 47A 0.056 ohm 417W 210nC x10 $24.90 |
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POWER ACOUSTIK BAMF-1250/2 1250W MAX 2-CHANNEL CLASS AB MOSFET AUDIO AMPLIFIER $118.15 |
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20A 500V N-channel Power MOSFET Transistor 2SK2370 $4.14 |
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IRFP460A 20A 500V 3 Terminals Power MOSFET Transistor $5.16 |
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20PCS AO4600 4600 SOP8 POWER MOSFET TRANSISTORS $12.99 |
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20pcs AO4606 4606 A04606 POWER MOSFET IC SOP8 $15.99 |
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HIFONICS GLX2200.1D 2200W CLASS D CAR STEREO MONOBLOCK MOSFET POWER AMPLIFIER $387.15 |
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STF18NM80 N Channel Power MOSFET Transistor 18A 800V $9.78 |
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POWER ACOUSTIK CPT2-400 400W MAX CLASS AB 2-CHANNEL MOSFET CAR AUDIO AMPLIFIER $74.15 |
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POWER ACOUSTIK CRYPT SERIES 2-CHANNEL 200W RMS CLASS AB MOSFET SPEAKER AMPLIFIER $74.15 |
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MTP3055V N-Channel Power MOSFET 60V/12A, TO-220, 5pcs $3.99 |
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POWER ACOUSTIK CPT2-600 2-CHANNEL 600W MAX CLASS AB MOSFET CAR SPEAKER AMPLIFIER $82.15 |
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POWER ACOUSTIK CRYPT SERIES CLASS AB 250W RMS 2 CHANNEL MOSFET AUDIO AMPLIFIER $82.15 |
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POWER ACOUSTIK 2-CHANNEL 400W RMS CRYPT SERIES CLASS AB MOSFET SPEAKER AMPLIFIER $94.15 |
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CRUNCH GPV 800.2 800W CLASS AB CAR STEREO 2-CHANNEL BRIDGEABLE MOSFET AMPLIFIER $84.15 |
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CRUNCH GROUND POUNDER SERIES 800W CLASS AB CAR 2-CHANNEL MOSFET POWER AMPLIFIER $84.15 |
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IR IRF840 N Channel MOSFET Power Transistor. 500V, 8A. Qty 10. FREE SHIPPING!! $8.95 |
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Precision Power 2050M Car Audio Amplifier Car Stereo Amplifier Mosfet Series $90.99 |
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POWER ACOUSTIK CPT2-900 CLASS AB 900W MAX BRIDGEABLE MOSFET CAR AUDIO AMPLIFIER $94.15 |
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Precision Power 2050M Car Audio Amplifier Car Stereo Amplifier Mosfet Series $90.00 |
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3x N-channel Power MOSFET 5A 900V 2SK2651 TO-220F15 $5.29 |
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Power MOSFET FCA22N60 600V 22A 0.14Ω 4ns Tf TO-3PN $2.29 |
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N-Channel Power MOSFET – IRF610 – 200V – 3.3A $5.95 |
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IXFJ6N100 N-channel 1000V 6A Power Mosfet Transistor $6.05 |
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POWER ACOUSTIK CPT2-1500 CLASS AB 1500W MAX 2 CHANNEL MOSFET CAR AUDIO AMPLIFIER $114.15 |
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POWER ACOUSTIK CRYPT SERIES 2-CHANNEL CLASS AB 650W RMS MOSFET SPEAKER AMPLIFIER $114.15 |
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SPL GORILLA SERIES CLASS AB 840W MAX 4 CHANNEL MOSFET CAR AUDIO POWER AMPLIFIER $88.15 |
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ST STU9NA60 N Ch Power MOSFET Transistor. 600V, 9A. Lot of 2. FREE SHIPPING!! $9.95 |
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POWER ACOUSTIK CPT1-3200D MONOBLOCK 3200W MAX CLASS D MOSFET SUBWOOFER AMPLIFIER $168.15 |
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POWER ACOUSTIK CRYPT SERIES CLASS D 1 CHANNEL 1800W RMS MOSFET AUDIO AMPLIFIER $168.15 |
How To Repair LG 710E CRT Monitor With Power Blink Problem
LG 710E 17” CRT Monitor came in with the complaint of power blink. A power blink problem can be cause by either in primary or secondary section or even in both sections.
A defective power IC, power fet breakdown when under load, high esr in electrolytic capacitor, increased in current sense resistor value, a shorted zener diode, a leaky transistor, open circuit or resistor has changed value in primary side can cause power to blink. As for the secondary side, a shorted secondary diode, flyback, HOT, horizontal yoke coil, damper diode, B+ fet, an open filter capacitor, shorted IC and etc can cause power to blink as well.
Normally what I do is to remove the B+ fet first and connect a light bulb to distinguish whether is the primary or after the B+ circuit components that caused power to blink. However in this case, I did not put the light bulb and I directly removed the B+ fet and power on the monitor. For your information, this B+ fet is the N-channel mosfet and this B+ fet is part of the boost circuit.
After removing the B+ fet, not only the power didn’t blink, there was display as well and the anode voltage reads about 12 Kilo volt (a good monitor should have about 24 KV). The reason why you got 12 kilo volts is because the boost circuit is not functioning due to the removal of the B+ fet. The display shown a small width and the horizontal size control is already set to the maximum (you can’t get maximum width because the anode voltage is only 12 KV). You can control or set everything in the On Screen Display (OSD) except you can’t bring horizontal size to maximum.
With having a display, it is a good clue to me because I knew that many circuits is working such as power section (so you don’t suspect primary side anymore), flyback transformer, yoke coils, micro-p, eeprom, horizontal and vertical circuit, color circuit and even the Osd circuit. Without the B+ fet, there is display but with B+ fet the power blink. In this case, one would always check the B+ fet first am I right? However the B+ fet turned out to be good!
Now where is the culprit hiding? Troubleshooting sometimes can be very frustrated and most of the time is always fun. One of my methods that I liked to use is to touch for any unusually hot components on board with my finger. (Please take note for all electronic repairers-switch off and unplug the power cable and discharge the big filter capacitor in primary side before you begin to touch any components).
Usually after power off, I would touch on the flyback first then to other components surrounding the high voltage section. While browsing the components with my finger I stumbled upon a resin coated ceramic disc capacitor which is quite hot. It is located near the flyback transformer and in fact the capacitor was there is to act as a filter capacitor for the 400 vdc line output as shown from the photo.
After the cap was removed and checked with an analog meter, it showed a shorted reading even in the X1 ohms range. A good capacitor should show a charge and discharge activity in the X10 k ohms range. A new capacitor replacement for this LG 710E 17” CRT Monitor cured the fault.
The reason why the monitor power blinks is because the faulty capacitor become shorted when in full operating voltage (boost circuit is functioning and approximately 60 -70 vdc enter the B+ flyback pin).
When the B+ fet was removed (boost circuit not working and only about 40 vdc enter the B+ pin of flyback) the monitor is not working under full operating voltage and the faulty capacitor can still tolerate (partial short) and became hot. I believe if the monitor is switched “on” for a little longer, it would cause the capacitor to develop a direct short circuit and if this happen, removing the B+ fet to test the monitor would not make any different (the power would still blink).
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.
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DualCool NexFET power MOSFETs