Released on September 19, 2014, this 4.7" screen iPhone is the smaller version of the iPhone 6 Plus.

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iPhone 6 dead, no short found

I have a water damaged iPhone 6. As usual I fully cleaned the motherboard using alcohol. Tested the board using multimeter, no short found in both vcc_main and batt_vcc lines. The voltage readings are correct (above 5v) for caps around Tristar and Tigris chip.

But the phone still won't turn turn on with a good battery! Can anyone help me??

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If your main power lines appear to be okay, then you ned to move upstream. I would check the voltages generated by the PMIC (U1202). The PMIC creates all of the power rails necessary for the proper functioning of the device. Start with PP_CPU, PP_GPU, PP_1V8_SDRAM, PP1V2_SDRAM and the VAR_SOC lines. Check for shorts (warning, CPU & GPU are low resistance rails) and then proper voltages.

Come back and report your findings by commenting on my answer.

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Do you have one of those adapters that you plug in to a DC bench power supply and plugs directly into the battery connector to switch on the phone?

Use that and it should be able to turn on and display the amperage current draw from the DC bench PSU.

Note that you will need to either use the power button or short the power button pins for the power button connector on the logic board to power on the phone.

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DC power supply is your next step to see what category of problem you have. Phones can die equally from a power problem--one of the power lines is short to ground or from data line problems--a bad chip, short to ground, open line, or static on a data communication line.

Your best tool is to look at the pattern of corrosion under the microscope--where did water hit this phone? This is assuming you've taken off the shields and cleaned the board.

Post your findings on visual exam for more guidance.

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