A1706 no image after screen remplacement

[ledevgeek]

hello everyone i would like some help i have A1706 EMC 3163 laptop i have had broken screen but was working i have replaced the screen and i lost the image when i put back the old screen no image the laptop turn on but nothing if you can guide me or give help thank you

[mon2]

Re: A1706 no image after screen remplacement

hi.

1) Power down and check each cable from the display to the logic board. Confirm that the mating connectors are seated properly.

While you are in there, please note and post the logic board number.

It should be 820-xxxx format and will be etched onto the circuit board somewhere.

2) Power on - do you hear the boot chime? You can do the PRAM reset to hear the chime.

3) Allow for the system to boot and then apply a flashlight from the front side of the display at various angles. Can you see the desktop / login icons ?

If you can see the graphics, then the backlight power supply is not powering the backlight of the display.

First confirm the above and post your results.

[ledevgeek]

Re: A1706 no image after screen remplacement

hello even with pram no chime on start up , with the flashlight i can not see any login or apple logo black screen i test my port with usb c tester i have 19v and amps is good so i dont now what is the issue thanl you the board is 820-00239

[mon2]

Re: A1706 no image after screen remplacement

Suggest to download the schematic and boardview files for this 820-00239 chassis and then inspect each power rail to confirm they are operational.

https://www.badcaps.net/forum/showth...ight=820-00239

You can try to remove the display and work only with the logic board and see if there is a chime or fan spin.

Is the external adapter an official Apple power supply? Is the power adapter powerful enough to support this logic board? Should be 65W or higher I would think.

The USB Type C negotiating @ 20V is a good sign. Please confirm this. This implies that the USB Type C controllers CD3215 are working properly. This is a good sign.

See here:

https://logi.wiki/index.php/CD3215_Bootup_Sequence

The boot order of operation is the number inside the circle.

[ledevgeek]

Re: A1706 no image after screen remplacement

so i found i first problem when i plug the trackpad the machine doesn't turn on

[ACS-Repair]

Re: A1706 no image after screen remplacement

Very unusual for this to happen if you took proper care on the replacement. There are voltages present at the screen connector when the power is off. Shorting one of these to ground would damage the supply line. Do you remember disconnecting the battery before pulling or re-inserting the screen cable?