Hello all! If anyone knows, it's you guys!
I'm an electrical engineer by trade (automotive) so not completely useless, but clueless when it comes to anything without wheels....
My Toshiba Regza 42 XV 555 is being a pain. The screen went blank while watching with a pop/click that sounded like a relay shutting off. Or a cap popping.
Anyways, been searching the net and playing with it for a few hours and turned up stumped...
Picture can be seen using a flashlight on the screen.
Power supply board is giving all the right voltages.
Inverter board - getting 24V DC from the supply board on all pins, and all GND pins are grounded fine.
However, there are 4 connections coming from the mainboard to the inverter (joining into the ribbon with 24V DC wires) that I'm not sure about - one GND, one reading ~1.9V, one ~3.3V, and one ~5V.
Would the 1.9V likely be a backlight on command that should be reading >3V ?
I haven't tested any of the AC parts of the inverter board as I have a cheapy multimeter I don't trust for it.
There are 3 pink wires coming from the inverter, I would assume to the backlights - one from the bottom of the board, two from the top.
Each half of the board has 2 coils. On the top half (with the 2 pink wires), there is a blue dipped/disc capacitor coming off the secondary side of the coils that doesn't really look bulgy. At least no more than a usual fat capacitor in my opinion, so I don't think it's that.
What else could it be?
The coils all going at once is unlikely, and so is all 3 backlight sections going at once.
I can get a replacement inverter board cheap enough, but I'd rather be sure it's that (if indeed it is) before splashing cash on it....
Thanks!
I'm an electrical engineer by trade (automotive) so not completely useless, but clueless when it comes to anything without wheels....
My Toshiba Regza 42 XV 555 is being a pain. The screen went blank while watching with a pop/click that sounded like a relay shutting off. Or a cap popping.
Anyways, been searching the net and playing with it for a few hours and turned up stumped...
Picture can be seen using a flashlight on the screen.
Power supply board is giving all the right voltages.
Inverter board - getting 24V DC from the supply board on all pins, and all GND pins are grounded fine.
However, there are 4 connections coming from the mainboard to the inverter (joining into the ribbon with 24V DC wires) that I'm not sure about - one GND, one reading ~1.9V, one ~3.3V, and one ~5V.
Would the 1.9V likely be a backlight on command that should be reading >3V ?
I haven't tested any of the AC parts of the inverter board as I have a cheapy multimeter I don't trust for it.
There are 3 pink wires coming from the inverter, I would assume to the backlights - one from the bottom of the board, two from the top.
Each half of the board has 2 coils. On the top half (with the 2 pink wires), there is a blue dipped/disc capacitor coming off the secondary side of the coils that doesn't really look bulgy. At least no more than a usual fat capacitor in my opinion, so I don't think it's that.
What else could it be?
The coils all going at once is unlikely, and so is all 3 backlight sections going at once.
I can get a replacement inverter board cheap enough, but I'd rather be sure it's that (if indeed it is) before splashing cash on it....
Thanks!
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