Hello,
I have a DJ mixer here, an Xone:92 by Allen & Heath.
When I turned it on, only magic smoke came out, so I turned it off again.
An optical troubleshooting has brought me quite fast to the
source of the smoke: two resistors look disproportionately black (see first pic)
Those are R73 and R74 on the master PCB. See second pic for the corresponding page of the service manual.
Behind those resistors are five OP-Amps (U3, U4, U5, U6 and U9).
My thought is that one (or more) of those is defective. I've measured...
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Re: Toshiba 49U6763DA (Mainboard: Vestel 17MB120) Powers on, backlight ok, no picture
Okay, got a new tcon and installed it today. Now there is a picture, but it's only clear for about 2 seconds, then it flickers for 2 seconds and so on. Here's a video: [url]https://imgur.com/a/YGmlZwl[/url]
It's not clear in the video, but the upper right part seems to flicker/change brightness even when the picture is clear. And there's a small black line visible through the middle of the panel.
I've wiggled at the cables, didn't make a difference. Wrong tcon? Or...
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Re: Toshiba 49U6763DA (Mainboard: Vestel 17MB120) Powers on, backlight ok, no picture
No luck with the firmware update. When I hold ok during power up it goes straight to standby. Doesn't matter if the usb drive is plugged in or not.
But with the remote I've managed to change the input, I get sound via HDMI. At least something. Gonna try a new tcon and if that doesn't work a new mb. I think this TV is worth it
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Re: Toshiba 49U6763DA (Mainboard: Vestel 17MB120) Powers on, backlight ok, no picture
Nice. thank you.
There are four files in that zip:
mb120_en.bin
mb120_PM51.bin
RomBoot.bin
usb_auto_update_G6F.txt
Do I put all of those files on an usb drive?
I've read somewhere that the way to update is to unplug the TV, insert the usb drive, press and hold "Ok" on the remote and the power on the TV. Is this correct?
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Re: Toshiba 49U6763DA (Mainboard: Vestel 17MB120) Powers on, backlight ok, no picture
Okay thanks. I've checked both sides independently and still no picture. I'm gonna look for a new tcon. Found none with the correct part no on Aliexpress, but there are a few on ebay.
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Toshiba 49U6763DA (Mainboard: Vestel 17MB120) Powers on, backlight ok, no picture
Hello,
I have a Toshiba 49U6763DA TV that shows no picture. It turns on, the backlight works, but nothing else. I don't have a remote at the moment to check if this is working.
I have opened the unit, every plug is connected, nothing seems to get hot and all caps look ok. I checked the small caps on the tcon board and the two boards that sit between the tcon and the panel (I don't know what they are called). None of the caps are shorted. The tcon board gets 12V (actually 12.5V) and the fuses are fine.
So I'm thinking that the motherboard is defective...
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