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Released on September 19, 2014, this 5.5" screen iPhone is the larger version of the iPhone 6.

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iPhone 6 Plus touch not working, already replaced touch IC

Hi guys, I have an iPhone 6 Plus here, classic touch IC problem. As usual I replaced meson IC, did the M1 jumper, however it still had no touch. I then replaced Cumulus IC, again no touch. Upon further investigation, I found PP5V7_SAGE_AVDDH line has problem. I tested the line using diode mode, C2414 & C1577 have very low reading: 0.05v. The line is almost shorted (but not fully shorted). I removed Meson IC, PP5V7_SAGE_AVDDH line was back to normal, readings of caps C2414 & C1577 are both correct in diode mode. I thought the Meson IC might be faulty, so I replaced another one. To my surprise, as soon as I installed the Meson chip, PP5V7_SAGE_AVDDH line is shorted. I tried 3 Meson ICs, same result. The line was ok once the Meson chip was removed, but would get shorted as soon as Meson chip installed. The thing is, I already tried 3 Meson chips!

Can anyone help please? Much appreciated.

Update: I just realized that I didn’t explain the problem properly in the initial post above. In fact, the PP5V7_SAGE_AVDDH line didn’t get shorted soon after I installed the Meson IC. The line was fine after I installed the meson chip, however, as soon as I turned on the phone, the PP5V7_SAGE_AVDDH get shorted. After removing meson chip, the short disappeared. However, in the 2nd try (after I powered up the phone), PP5V7_SAGE_AVDDH line would get shorted as soon as the meson chip installed. It looked like something happened to meson chip after I turned on the phone.

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I thought these things only happen to me. I would try putting pressure on the PP5V7_SAGE_AVDDH pads while taking some diode readings there are a few ground pads around that area, It’s possible that somehow after replacing meson that the traces in the board are distorting and touching one of the ground traces. I have encountered this before but not with meson and the phone had been water damaged. Best of luck.

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1 Answer

Hi

Can you please post a pic of the area. if its on or off. my guess is IC installation

Further, just to get an idea, how experienced are you with microsoldering.

Thanks

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Hi, I am experienced in micro soldering & micro jumper. I’ve repaired lots of iPhone 7 audio IC/touch IC/baseband IC without any problem in the past, this time it just drives me mad.

However, I just realized that I didn’t explain the problem properly in the initial post. In fact, the PP5V7_SAGE_AVDDH line didn’t get shorted as soon as I installed the IC. The line was fine after I installed the meson chip, however, as soon as I turned on the phone, the PP5V7_SAGE_AVDDH get shorted. After removing meson chip, the line get back to normal in diode readings. However, after I powered up the phone, PP5V7_SAGE_AVDDH line will get shorted as soon as meson chip installed. It looked like something happened to meson chip after I turned on the phone.

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either its one of 3 things imo

1) partial shorted cap on that line. there is couple of them. look for solder balls, discolouration. look into schematic for location of them

2) too much heat on chestnut

3) meson placement

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