Diagnosis for A1267 Cinema Display with no USB but working MagSafe
So here is the rundown:
I got this display on Craigslist for cheap.
When plugging in, it supplies my 2011 MBA power via MagSafe but:
-The panel shows no signs of life
-System Report on the MBA doesn't register any external USB or iSight devices
When opened, the power supply has some residue on the front of the board.
Going through the deep dive for Dead Unit/No Power in Apple's technician PDF:
1. No
2. No, unless somehow the MBA 2011 11" isnt a 'supported system'
3. No voltage on TP11
4. No voltage on TP61
9. No voltage on TP61 or TP13
Conclusion: Replace logic board
So even though there is some residue on the power supply board, there still seems to be issues with the logic board.
When I unplug the 7 pin power connector from the logic board, it has these voltages from left to right, 0 - 7:
1. Nothing: zero volts to anything else
2. Ground
3. 6V to GND
4. 6V to GND
5. 6V to GND
6. 30V to GND
7. 30V to GND
I am left thinking that my Logic Board needs some help..
Please let me know anything else I can post to help with a solution
Thanks,
Timothy
2条评论
Ive seen too many of these with logicboard issues. The PSU as bad as it looks it probably ok. The connector your measuring needs to be connected to the PSU to get a proper voltage reading. Most of these displays have failed gpu’s due to dust and heat. I would put the money you’ll use to replace the LB into something more relable, unless you want to disasseble it every 6 moths for a dusting.
由 Anthony 完成的
But does a failed GPU prevent the USB and iSight from functioning?
由 Timothy 完成的