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Big lightning storm the other night - fried AC control board and a few AC adapters for small electronics. TV was wall mounted and plugged directly into the socket without surge protection (i know, i know)
No power LED, no backlights, no response at all.
I've taken the back off and inspected the boards for burn damage or swollen components. Tested fuse for continuity. Tried power cord from another TV. What should I try next?
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Measure for any DC voltages on the cable connector going to the mainboard.
Measure between an earth point on the power board (screwhead) and the pins. One should have the standby voltage that goes to the mainboard, that turns on the LED to indicate power is available. Hopefully it may be marked as to which one.
If no voltages at all the power board has a problem.
Be safety aware as there is exposed lethal AC power on the board close to where you will be testing
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@jeffthewhiteguy check to see if you have power going to your power board. You are going to deal with live AC voltages so be careful on here. Check the voltage on the fuse. Multimeter on 240VAC, red probe on fuse and black probe on the Neutral of the power plug should give you proper voltages. After that measure AC voltage on the rectifier (rectangular component with one chamfered edge) Measure the AC voltage on the two innermost legs after that measure the outermost legs DC voltage multimeter on DC voltage red probe on positive and black probe on negative leg. Let us know what it shows. After that proceed to measuring the voltages as suggested by @jayeff to determine if you get stby voltage.
Also, try and get a brighter, clearer pictures of your boards (both sides are needed since there are components on the bottom part as well)
oldturkey03 さんによる