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iPhone, iPad, iPod Hardware Repair Hardware Repair discussions for iPhone, iPod , iPad & Apple Products, help, guides. |
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01-09-2019, 07:29 | #1 (permalink) |
Junior Member Join Date: Oct 2015
Posts: 5
Member: 2479617 Status: Offline Thanks Meter: 0 | Iphone 5s no power I have an Iphone 5s board which was shorted. The shorted component on VCC_main is removed. STAGE 1: After promt to boot the result was stable 0.05 A on DCPS and not recognized by the PC. Power rails what i have measured: PP_VCC_MAIN - 3,8 V PP_BAT_VCC - 3,8 V PP1v2_SDRAM - 0,01 V (Diode mode shows "353" = no short) PP1V0_SOC - 1,0 V PP_CPU - 1,0 V PP_GPU - 0V (Diode mode shows "309") PP_1v8 Always - 1,8V PP1v2 - 0,01 V (Diode mode "383") PP1v8_SDRAM - 0,07 V (Diode mode "624") PP3v0_SDRAM - 0,20 V (Diode mode "629") PP3v3_USB - 0V (Diode mode "520") STAGE 2: PP1v8 RESET L was not present but not shorted also. I did removed the display IC for the reset line - Phone started to boot nicely was like 0,1 - 0,5 Amps and then suddenly 0. And now it wont boot at all. Suddenly the PP1v8 line is not present - Diode mode shows "1700" something. These diode result's looks a bit not normal - right ? Should be like 300-400 ? And also after the promt to boot all the power rail's are missing (but in diode mode does not show the short circuit - showing like "1230" and moving up. |
01-15-2019, 11:06 | #2 (permalink) |
Crazy Poster Join Date: Nov 2001 Location: Grosswardein
Posts: 56
Member: 7187 Status: Offline Thanks Meter: 12 | some issues can be reduced to power management cpu failure - check for short the pw. supply circuits - in that case no solution cause most of them are glued |
01-16-2019, 12:47 | #3 (permalink) |
Junior Member Join Date: Oct 2015
Posts: 5
Member: 2479617 Status: Offline Thanks Meter: 0 | Hei, Thanks for the replay. But can you be a more specific about the "Power management CPU fail" - Here you are talking about the PMIC himself ? As i have told , i have looked up the power rail's - Diode mode shows "1500" but that is not a "good" value. |
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