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ppbus_g3h is 8.85v

Thanks for your replay al these rails are present PPBUS_G3H PPBUS_S5_HS_COMPUTING PPBUS_S5_HS_OTHER5V PPBUS_S5_HS_OTHER3V PP3V42_G3H PPVRTC_G3H PP5V_S5 PP5V_S4 PP3V3_S5 PP3V3_S4 PP3V3_SUS PP3V3_S3 PP3V3_S4_TBT PP1V05_SUS and these rails are missing: PP3V3_S4SW_SNS PP1V35_S3 PP1V35_S3_CPUDDR...

no the board doesn't turn on. and these two rails are missing PP1V35_S3 and SMC_SENSOR_PWR_EN

The actual problem is that SMC_SENSOR_PWR_EN on pin2 of Q5480 is missing Q5480 pin 3 is 0v, p4 12.58v and p5 12.4 and p6 12.58

a 3476 macbook pro it has the orange light on the charger and all the rails are present except SMC_SENSOR_PWR_EN.

an other known working ssd with OSX shows the folder with question mark only when I boot with external HDD I can see the onboard sdd but from the SSD doesn't work

I did boot on external HDD and onboard SSD appears into Disk Utility.

when SSD is connected to the board pin 7 and 8 get 0v but when I take the ssd out they get 3.2v. Checked the trace and connectors as well. Could it be a bad CPU?

when SSD is connected to the board pin 7 and 8 get 0v but when I take the ssd out they get 3.2v. Checked the trace and connectors as well. Could it be a bad CPU?

pin 1 PP3v42_G3H= 3.4 pin 2 P3v3SSD_VMON= 0.98 pin 3 SSD_RESET_L = 3.4 pin 4 SSD_RESET_CONN_L = 3.4 pin 5 GRD pin 6 SSD_PWR_EN 3,2 pin 7 SSD_CLKREQ_CONN_L= 3,2 pin 8SSD_CLKREQ_= 3,2

SSD_RESET_CONN_L = 3.42v SSD_CLQREQ_L = 3.42

the board looks fine but it doesn't read SSD on U3740 pin P3V3SSD_VNOM is 0.9v I replaced the R3741 and R3742 all the other pins are fine I get 3.1v. any suggestions?

ok thanks for your help

Dear Sir, Thanks for your replay, I've tested it with two other known working dc in boards. same result. SMC_LID on keyboard connector pin 1 shows 1.5v

820-3437 board which it turns on for a few seconds turns of and again turns on and stays on but there are two issues 1: even thou there is no green light on the charger the board stays on after second time. 2; second time that it turns on and stays on the screen lights up for a second and after...

no sir i haven't replace the U7701 yet Should I do it? it lights up when it chimes and than the voltage on D7701 gradually drops to 8.5 which is my ppbus-G3h.

Thanks for your replay on R5490 1 and 2 have 8.6v but 3and 4 nothing

Dear maybe it's a silly question but there is no XW7720 on the board between D7701 and L7701.

a 820-3437 The voltage on the back light booster D7701 gradually drops from 33v to 8v. the logic board turns on after 2 second turns of and than turn on ans stays on. any suggestion?

My 820-3115 doesn't recognize a known working LCD assembly. LCD_IG_PWR_EN is missing. I have cpuvcore, USB mouse gets steady light even after reconnecting it. Any suggestions????