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Lanzado en Septiembre 16, 2016. Modelos 1660, 1778. Disponible en GSM o CDMA / 32, 128, o 256 GB / Oro Rosa, Oro, Plata, Negro Mate y Negro Brillante.

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U2710 getting hot, no shorts

We have a board that the U2710 gets really hot. I ordered replacement chips and swapped this power switch component.

Same situation stands, This chip really gets hot, the top half of the board doesn’t appear to heat up at all. VDD_Main draws 3.6V with a DCPS, PP1V8_SDRAM draws 0.450V. NAND lines draw nothing.

I suspect power is getting to this component but not getting through it possible?

Would really appreciate a second opinion on something a bit tricky like this. Thank you!

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Try checking the issue with pp1v8_sdram first as it's to low

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Weird, after testing with DCPS, short to VDD_Main came back, was again under U2710, replaced with another and short gone, this happened one more time (10 chips arrived from aliexpress - plenty to test). Seems to get a short when DCPS is on. with a battery this draws 0.01mA. Trying to look at the schematics with ZXW to see where the power should be going.

Thank you for the help so far.

- Por

Whenever I have this with a battery, it draws no power really, DCPS causes a constant short in the U2710, I’m thinking it could be something charhing related with a line, or chip, maybe tristar or tigris. Will update this

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Try the bb_pmic

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2 Respuestas

Solución Elegida

I managed to sort this one. At first I swapped this U2710 and it made no difference, what did sort it was changing Tristar,

I also changed Tigris before Tristar but that didn’t change anything, so it was a Tristar fault I believe.

Successful case!

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PP1V8_SDRAM draws 0.450V. Perhaps something down long that line is pulling that line down? Can be capacitors or bad resistor causing this on that same line. It’s probably a partial short which will take some time to find out which one is bad. Try removing caps on that line (Test for resistance on caps to compare resistance to ground) and see how it goes.

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Will give that line a look. Thank you

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