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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone, iPad, iPod Hardware Repair

iPhone, iPad, iPod Hardware Repair Hardware Repair discussions for iPhone, iPod , iPad & Apple Products, help, guides.

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Old 10-11-2018, 14:10   #1 (permalink)
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iPhone 7 Plus no baseband version after water damage


Hi, like commented was water damage, was sulfated just at bottom rear area, up to backlight capacitors anf filters. Changed a filter and capacitor and half backlight issue removed. But still stuck in searching and don't show baseband version, IMEI is OK. Also some times doesn't work the touch.
Rest of the board wasn't sulfated.
Any clue to start measuring/tests? Any trick to check if BBPMU_RF right or the issue withouth removing?
Thanks in advance for any help
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Old Today, 01:19   #2 (permalink)
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1. you do not know how many layers of board shorted because of water damage.
2. layers you see on top is not only layers, thin layers are below ics they might get burn after water get in.
3. these water damage repairs are hard to fix completely because you fix 1 issue then 2ond isssue comes then you fix 2ond, third issue comes, then 4th and so on, and you keep working for same $$ all time
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Old Today, 01:54   #3 (permalink)
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Rather than under layers I think when be with water or then sulfated some lines are jumped and managed over voltage than designed, due that or overheat side effect get damage any IC or other component. While BB CPU, RAM or CPU are OK I have hope in this case. Don't so bad, just bottom bad lucky like commented, if were sulfated allover I were leave it since beginning. Main issue for me it is the Intel model, ZXW and schematics around bet for Qualcomm one.

Enviado desde mi HTC 10 mediante Tapatalk
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Old Today, 09:37   #4 (permalink)
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@christina is right.If you have zxw tool just check resistance values on all bottom connectors first,if anything abnormal look into that rail.As u have told that damage was only at bottom, in some cases backlight ic's and lcd ic''s are culprit.
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