Released September 25, 2015. Model A1688/A1633. Repair of this device is similar to previous generations, requiring screwdrivers and prying tools. Available as GSM or CDMA / 16, 64, or 128 GB / Silver, Gold, Space Gray, or Rose Gold options.

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Strange backlight issue after repair.

I'm having a strange issue with the backlight on an iPhone 6s, I replaced the display and the home button, turned it on, all worked fine, went to return it to the customer and it wouldn't turn on, I presumed it had gone flat so I advised them to charge it and get back to me. I ended up taking it back, the backlight wouldn't turn on at all, the strange part is, I have managed to get it to work partially, I messed around for a little while and found that if I plug in either the old smashed display or the new replacement without the back plate on or the sensor ribon plugged in it boots up with no backlight but works fine once booted, when it's together I'll get a flash of backlight after it has booted the first time you try to wake it with the power button, then nothing, but since it stopped working after the initial boot straight after repair there has been no backlight during boot. Worked fine after repair, now never during boot, works fine only with just the naked display panel attached, what is going on here?

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Sounds like a flaky replacement screen. Have you tried another screen?

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I don't have stock as I have mostly stopped doing repairs, I'm sure I could exchange it though, which I'll probably do. So you think it's more likely to be the display rather than the backlight circuitry on the mobo?

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That's hard to say without knowing the history of the device. That said, the BL seems to work when the backplate is not there so I suspect the problem is related to the screen and not the logic board. If you have the tools, probe the BL circuitry to be certain.

It's just that you mentioned "customer". So I assumed you are a shop and the obvious thing to do would be to try a different screen.

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dicko101 will be eternally grateful.
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