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ok so I replaced U9300 + Q330/31 The fans was spining, no shorts anymore, so I tried to reput the board into the computer , and again no fan , with the same short than before. I don't understand how it's possible. Do you have an idea Duke ?

Hi Duke thanks for your answer, you're right, I checked and there is a short between PPBUS_G3H to L9330 I found 0.5 Ohm What's the solution ?

And fake chips also ?

So I removed U9300 When I remove R5400 the short is still there on PPBUS_G3H with 17.8Ω and not anymore on PPVIN_S5_HS_COMPUTING_ISNS But I've a short on PPVIN_S5_HS_GPU_ISNS => 18.6Ω There is a short on PPVIN_S5_HS_OTHER3V3_ISNS => 19Ω There is a short on PPVCC_S0_CPU_REG => 20.7Ω

Ok so I have changed U7100 and problem is the same Green light and orange light with no fan. I've Lifted F7140 and 7141 and resistance to the ground of PPBUS_G3H is 16.4Ω Where are the coils from secondary supplies ? Thank you really much for help.

The resistance on PPBUS_G3H is 19Ω The U9300 seems to have been resoldered correctly when I check on the microscope everything seems to be perfect.

Yes of course but to find a good supplier you have also to test the products, even if you use a fake chipset how to be sure that it's not a bad soldering ? And of course most suppliers have inconsistent quality no ? This Ω test take less than 5seconds, it's easy and you can save time.

Yes I will try to change it, but I have also PP5V_S5 = 0.851v PP5V_S0 = 0.455v So I have to change Both ISL U7501 and U7100 ? Or this problem can be caused by U9300 as it's the only thing touched on this motherboard before this failure. Thanks for help

Hi, I would like to know is someone have the solution to test GPUs before using them , to avoid lost of time and failures and to loosing time to reball a bad chipset. As all the chipsets from China are craps, I've seen that for the Xbox 360 and the PS3 some people use a Ω test to test the die...

Hi everybody, I'm working on a retina board for a graphic issue at the begining So I reflowed the U9300 and after that at first boot fan for 3 seconds then stop and now nothing, I checked U7100 between 17 and 18 = 3.5Ω U7100 between 27 and 28 = 21.5Ω U7100 PIN2 = 20V PPBUS_G3H = 1.67volts...