Aspire One 725 - Screen No picture - VGA and HDMI ok - da0zhgmb6d0 rev d

[EnricoS92]

Hello everyone, need a little help with this one,

I have this 10" laptop, wich seems to work fine, it starts, load Windows and everything else, but has no picture on the LCD screen, the output on the VGA and HDMI port works regularly.

The screen and cable are ok tested and working.

The board is a "da0zhgmb6d0 rev d" with AMD C70 APU, I checked, all the voltages are present.

I flashed a working bios i found on this forum but same problem.

I can only find that, on the screen connector, DISPON and LCDVCC are missing, also LCD_VADJ is 0.0V

The signal, INT_LVDS_BLON is pulled down to 0,0V as the board is turned on.

Also INT_LVDS_DIGON is 0,0V.

These 2 signals come from the APU directly, is it the APU that is broken?
Or is some other signal to the APU that is missing?

What else should I check?

Attached the schematic.

[EnricoS92]

Re: Aspire One 725 - Screen No picture - VGA and HDMI ok - da0zhgmb6d0 rev d

Ok, I reply to myself.

I solved it, it was a 0 ohm resistor R22 that had gone bad, on the LCD_DATA_EDPAUX-_R line.