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Cumulus Touch IC
How ironic is that? By todays' standard, electronics back in those days was simply enormous. Look (left) at what we have to work with today.
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Flux & Heat to Cumulus IC
- Touch Disease / Pry Damage
- Long-Screw Damage / FPC connector
- Backlight / Micro-jumper
- Water Damage / Data Recovery
- General troubleshooting
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Cevap: No network but my simcard fine with other's phoneAfter you have eliminated antennae or network locks as the possible culprit, searching issues on the iPhone 6 are usually related to the baseband IC. The baseband IC is very sensitive, just like the Touch IC's on the 6 Plus; it also suffers from poor quality traces and pads. Go to your phone’s dialing keypad and dial *#06#. You should see the IMEI displayed. If the IMEI is not displayed, the Baseband IC has to be reballed and two small copper traces (U1/V1) have to be rebuilt and solidified. This is commonly referred to as the “long jumper” solution. You can check out this answer (Service is "Searching" indefinitely) (by @teetopp) as it summarizes the issue really well.
Cevap: iPhone 7+ Touch IssuesThe problem is with your OEM screens. The 7/8 series original screens are made by several manufacturers (Toshiba, LG, Sharp) and each phone is calibrated to the screen it has installed. It’s important not to mix and match screens. So for example, if your phone had an original LG screen, you should replace it with an LG screen. This issue seems to be more prevalent on the Plus devices; they can be quite picky when it comes to replacement screens. The only way to know which screen manufacturer you have is to look at the QR Code on the 3D Touch panel. However, even if you have a screen with the same code, it may still be a franken-screen. Lots of refurbish shops mix and match an LCD from one vendor, a 3D Touch panel from another, etc. All you can identify is the 3D Touch panel. Check out this blog (not affiliated) to learn more. It explains how the different mix of products affects the reliability. It turns out that some franken-screens have a much higher prevalence for Touch issues than others. Curiously enough...
Cevap: Phone restarts after cleaning home button flex wire connectionI’m not certain I fully understand your description but it sounds to me like the Home Button is damaged in some way. It’s not uncommon for the Home Button flex to get micro-tears during a repair…you may need magnification to inspect it properly. Can you clarify what you mean by “home button flex wire”. Perhaps you can link to a repair guide image so that I fully understand what you are referring to.
Cevap: black back camera not working but why did my front camera go outThe front camera will not work if the rear camera is in a non-functional state. Solve your rear camera issue first and the front camera should work properly (unless it somehow got damaged).
Cevap: iPhone x does turn on but screen is totally blackMy initial though was that you had a bad replacement screen…but then you final comment about replacing the housing has raised my doubts. The easiest thing to try is to install another replacement screen, however they are not cheap so you’ll either have to front the money or go to a shop and see if a local tech would be willing to try a replacement screen for you. If a new screen doesn’t solve the issue though, you will have to teardown your phone and inspect the logic board, connectors and flexes to see if there is any damage that may have occurred during your housing replacement. Sometimes flex get very minor damage (use magnification) that allows them to work at first but eventually give way.
Cevap: VDD_Main short iPhone 7 plusCar chargers are notorious for causing issues with the charging circuit (Tristar). At 22 Ohms, it appears that the VDD_MAIN line is compromised. I would test it in diode mode to be certain. As for finding the fault, you need to apply a structured process and start testing various main power lines to see if the issue is isolated to VDD_MAIN or if VDD_MAIN is being dragged down by something else. Open up the schematic and start probing the PMIC outputs, preferably in Diode mode and report back.
Cevap: Why is my iPhone X inverting colors after screen replacement?I would certainly go back to the repair shop and have them take a look. It is probably a defective replacement screen and this should be covered under warranty.
Cevap: iPhone 7 no sound on earpiece only during a callTry a known-good FCAM flex, not just one pre-installed on another screen…just to be certain. Afterwards, check the passive components near the connector as excess heat from the Audio IC work may have floated some components that are covered in epoxy next to the FCAM connector. You can do this by probing the FPC and comparing to a known-good device or a tool like ZXW.
Cevap: Display problem working when keeping a tissue paper insideDangerous…no. But it still doesn’t solve your problem long term. Eventually, whatever is causing the issue will continue to degrade and eventually, the screen will stop working again. That’s fine if you don’t want to spend money on the phone now but like the FRAM filter guy used to say…”you can pay me now…or you can pay me later”.
Cevap: Touch IC Reballed 2 times, cumulus overheatingIn situations like this, you have to do a bit more probing before powering up the device again. Meson and Cumulus have nothing to do with the actual image so that is your first clue. An overheating Cumulus is another clue. So in this case, once you removed Meson, you should have checked the touch and LCD related power rails for short circuits because the touch and LCD circuit are powered by the same same IC (Chestnut).
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