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Diode replacement equivalent
- Thread starter rlovison
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rlovison
Well-Known Member
Thanks for the input. Unless I'm looking at the info incorrectly, both diodes are in-stock.
The diode that failed is the left one of the three located directly above the secondary of the switch mode power transformer in the image below (the one with one lead disconnected). It reads as a dead short in both directions. Main fuse was blown as well. This is the main board of an inexpensive 2 year old, Emerson 19" LCD TV I picked up at the transfer station last week. I purchased a working used board from eBay for $20 though I'm still curious as to what happened to the original.
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Trio
Super Member
Double check, while they sometimes do have some nonstocked items in inventory, normally they are showing what the factory has available to ship to them. When I looked initially, they had them entered as all non-stock items, so their IT people are doing something in those pages.
If in doubt, place the order and find out.
But they should work. The other things to look at on those is the transistors of the inverter section for the backlighting, the usual capacitor suspects- although I have encountered some that had no outward evidence of stress, and they were still quite dead. Also check the higher current rectifiers, some are fast recovery and some are slow recovery. There is also a chip fuse or two worth checking on the inverter board typically as well.
The transistors may need to be removed to test them, the impedance of the inverter transformers are often too low so an in circuit test gives a false reading as it is reading another transistor as well. Sometimes the flyback transformer of the inverter can burn open or short out.
If in doubt, place the order and find out.
But they should work. The other things to look at on those is the transistors of the inverter section for the backlighting, the usual capacitor suspects- although I have encountered some that had no outward evidence of stress, and they were still quite dead. Also check the higher current rectifiers, some are fast recovery and some are slow recovery. There is also a chip fuse or two worth checking on the inverter board typically as well.
The transistors may need to be removed to test them, the impedance of the inverter transformers are often too low so an in circuit test gives a false reading as it is reading another transistor as well. Sometimes the flyback transformer of the inverter can burn open or short out.
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