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Samsung EVO 850 overvoltage repair http://forum.hddguru.com/viewtopic.php?f=10&t=37331 |
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Author: | fzabkar [ September 3rd, 2018, 15:21 ] |
Post subject: | Re: Samsung EVO 850 overvoltage repair |
Measure the resistance between Ground and each of the Vin and Vout pins of the TPS22966 load switch (14-pin, marking RB966). viewtopic.php?f=10&t=35276 We need to determine which ICs are connected to the 5V supply. To this end, can you identify the markings on the remaining ICs, including the tiny ones? Can you measure 1 ohm across any of the other capacitors on the PCB? |
Author: | Tom33 [ September 4th, 2018, 8:54 ] | ||
Post subject: | Re: Samsung EVO 850 overvoltage repair | ||
Hello, thanks for help! I measured the resistances (see picture). Both inputs of the IC TPS22966 are short-circuited (0Ohm, 1Ohm). What you mean with "can you identify the markings on the remaining ICs" sorry my english is maybe not good enough (markings=overprint on the IC?). I don not know how i can find the short-circuit without try and error (unsolder and resolder parts) method!? Thank you for helping me!
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Author: | Tom33 [ September 4th, 2018, 9:22 ] | |||||||
Post subject: | Re: Samsung EVO 850 overvoltage repair | |||||||
I try to make some pictures with my usb Microscope from the ICs
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Author: | fzabkar [ September 4th, 2018, 17:49 ] | |||
Post subject: | Re: Samsung EVO 850 overvoltage repair | |||
All the outputs (V1 - V6) of the S2FPS02A02 chip appear to be shorted to ground. This is the main power controller IC. The other power regulator ("PTSI") generates voltage V7. Is the associated test point (capacitor) also shorted to ground? TPS62130, TPS62130A, Texas Instruments, 3V to 17V, 3A adjustable Step-Down Converter, 3x3 QFN, marking PTSI/PA6I (sometimes marked as GUILL): http://www.ti.com/lit/ds/symlink/tps62130.pdf TPS22966, Texas Instruments, 5.5V, 6A, 16-mohm ON-Resistance Dual-Channel Load Switch, marking RB966: http://www.ti.com/lit/ds/symlink/tps22966.pdf K4E8E164EB-SGCF, Samsung, LPDDR3 SDRAM, 8Gbit, 1866Mbps, 1.8V/1.2V/1.2V: https://www.samsung.com/us/samsungsemiconductor/pdfs/PSG_1H_2016.pdf SN74AUP1G125DCKR, Texas Instruments, Low-Power Single Bus Buffer Gate w/ 3-State Output, 0.8V - 3.6V, marking HMR, SC-70-5: http://www.ti.com/lit/ds/symlink/sn74aup1g125.pdf
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Author: | Tom33 [ September 5th, 2018, 8:15 ] | ||
Post subject: | Re: Samsung EVO 850 overvoltage repair | ||
I could not really measure V7 with my multimeter (value varies very much), but should not be shorted.
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Author: | fzabkar [ September 5th, 2018, 15:37 ] |
Post subject: | Re: Samsung EVO 850 overvoltage repair |
ISTM that the S2FPS02A02 chip is dead. You could confirm this by removing one or more of the inductors (except the V7 inductor) and then retesting for shorts at each of the pads. If the short remains on the IC side of the inductor, but goes away on the capacitor side, then the IC is dead. |
Author: | Tom33 [ September 6th, 2018, 4:42 ] |
Post subject: | Re: Samsung EVO 850 overvoltage repair |
Hello! You are correct S2FPS02A02 chip is dead. Can anybody tell me where i can get S2FPS02A02? I cant find it on Mouser, Farnell... Can anybody confirm me that the capacitors (see my first post) near the Stef4s are 8,5uF? Can anybody told me the Value of inductors V1 (see picture, post from fzabkar), i destroyed it while soldering it out ! Again thank your al very much for your help, especially fzabkar! I will give you some feedback if i will get it work again! |
Author: | Tom33 [ September 6th, 2018, 4:44 ] |
Post subject: | Re: Samsung EVO 850 overvoltage repair |
Hello! You are correct S2FPS02A02 chip is dead. Can anybody tell me where i can get S2FPS02A02? I cant find it on Mouser, Farnell... Can anybody confirm me that the capacitors (see my first post) near the Stef4s are 8,5uF? Can anybody told me the Value of inductors V1 (see picture, post from fzabkar), i destroyed it while soldering it out ! Again thank your al very much for your help, especially fzabkar! I will give you some feedback if i will get it work again! |
Author: | fzabkar [ September 6th, 2018, 15:47 ] |
Post subject: | Re: Samsung EVO 850 overvoltage repair |
The capacitors near the STEF4S e-fuse are not critical. They are filter capacitors, so 10uF should be fine. In fact you could bypass the e-fuse with a wire link (by connecting Vin to Vout) and not bother with the capacitors. I suspect that the S2FPS02A02 is a Samsung device which is application specific and intended for Samsung's own use. I don't know the value of the inductor. I would guess somewhere between 1 and 10uH ??? |
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