Haier L26B1120
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This latest roadside find was totally dead. Haier is a Brandsmart brand. Its a 26 inch CCFL built in 2011. The fuses and caps all checked good but an FET was shorted. It was an AP4511GH which is a surface mount TO-220 style on the bottom side of the circuit board. That's an unusual FET in that its really 2 FETs in one package, an N-channel and a P-channel. It was unobtainable stateside but I found 2 for $5 out of China on Ebay. It was an easy repair if you're careful.
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Sometimes a zener will go bad and take out mosfets it’s rare I feel that a mosfet would just short for no reason unless something else is going or maybe a defect.
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With any luck, all it will need is the mosfet, but sometimes you lose the gate driver as well. John |
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John |
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My first experience with FET's was at a station in SC. They had a TK27 film chain. One day it lost the luma channel. I had no clue, but the asst CE knew exactly what it was. The FET preamp blew out on the luma channel. It was mounted right up there on the target ring of the pickup tube. He said they just blow out every couple of years.
Static can take out an FET. There's a great deal of concern about a high altitude EMP blast taking out almost everything electronic! |
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I did a lot of those when smaller size TVs were worth repairing. John |
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