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Need help with a Crucial SSD, short circuit in 5v line http://forum.hddguru.com/viewtopic.php?f=10&t=29757 |
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Author: | fzabkar [ June 25th, 2015, 23:07 ] |
Post subject: | Re: Need help with a Crucial SSD, short circuit in 5v line |
You should be measuring 5.0V between those two IC pins. That's the SSD's supply voltage. What voltages are you measuring at the 2V5, 1V0, 1V5, and 5VF test points? Also measure the voltage at the 1.0uH coil near the 88SS9174-BLD2 flash controller. |
Author: | bidomo [ June 26th, 2015, 0:10 ] |
Post subject: | Re: Need help with a Crucial SSD, short circuit in 5v line |
Voltages are as follows 2V5 0.19v - 0.20v 1V0 0.61v - 0.62v 1V5 0.01v 5VF 3.30v - 3.31v (this is the actual test point, IC leg was 4.35) 1.0uH coil 3.30v - 3.31v I'm using ground from the JTAG header and from the 5V test points near the LCT regulator, both give the same reading. |
Author: | bidomo [ June 26th, 2015, 16:17 ] |
Post subject: | Re: Need help with a Crucial SSD, short circuit in 5v line |
Ok, this is getting a bit weird... I don't know if RUN1..3 have to be measured in that exact order, but I did it that way, then waited for the SDD to cool and discharge to take some other readings. Here goes: Resistances: 2V5 24.9~25 1V0 25.6 1V5 12.2 Voltages RUN1 it tilts from 1.90 to 3.27 till it sits stable there (3.27) RUN2 This one is a bit of a wildcard, it could be totally stable at 1.40, then go all the way up to 3.27 and stay RUN3 Same as RUN2 RESET I never got anything concrete from this one, 1.40, 2.90, 1.30, 1.0, seems to change as long as power keeps running RUN1..3 :As soon as 1 of them reads 3.27 all of them will do the same, but if I remove GND, they will start tilting till they get to 327 Also, as the time runs and the device is still powered, some other voltages will change 2V5 0.12 1V0 0.49 1V5 0 5VF stable 3.30 as before AVI Vdd, Coil, will remain stable The 16pin chip reads 3412A N2962 The supposed flash chip, well, I'm not completely sure, will try some other lamp/light magnifier combinations, but I read C075 so far As for the testing suply, I'm using both a PC PSU rated 250W (from an old dell computer), and a standalone supply for a USB HDD. After you told me the PSU could possibly be unloaded, I added another hard drive and some fans. The reads remain almost the same even in the different time lapses, if I measure the SATA molex it will read 5.0~ in both PSUs, but as soon as I connect the SSD the will read 4.75 aprox (from the connected molex), all other molex in the Dell PSU will read 5.0~ correctly. |
Author: | fzabkar [ June 26th, 2015, 17:55 ] |
Post subject: | Re: Need help with a Crucial SSD, short circuit in 5v line |
I don't understand what you are doing when you say "if I remove GND", but the RUN voltages are OK. That would suggest that the LTC3545 IC is faulty. The RESET voltage should be sitting at a constant high level, so there is something wrong there. I can't identify the "CC" component, so I'm not sure what part it plays. I would try to source the two faulty ICs (LTC3545 and TPS3801T50DCK) from places like Farnell, RS Components, Newark, Digikey or Mouser. Just for completeness ... LTC3412A, Linear Tech, 3A, 4MHz, Monolithic Synchronous Step-Down Regulator: http://cds.linear.com/docs/en/datasheet/3412afe.pdf http://www.farnell.com/datasheets/1692450.pdf |
Author: | fzabkar [ June 26th, 2015, 18:11 ] |
Post subject: | Re: Need help with a Crucial SSD, short circuit in 5v line |
Just for completeness ... SN74LVC1G07, Texas Instruments, Single Buffer/Driver With Open-Drain Output, marking C075, DBV package: http://www.ti.com/lit/ds/symlink/sn74lvc1g07.pdf |
Author: | bidomo [ June 26th, 2015, 23:01 ] |
Post subject: | Re: Need help with a Crucial SSD, short circuit in 5v line |
I'm really sorry, but I wasn't clear enough when I said "if I remove GND", what I was trying to say is, I've been taking all of my reads without moving the multimeter from the ground in between reads, but if I removed it from ground, and try to read the voltage again, it will give me a different value. Well, I will have to buy those 2 ICs, and then will see what happens. Thanks for the help, I hope I can get this budy to work again. |
Author: | bidomo [ July 2nd, 2015, 19:46 ] |
Post subject: | Re: Need help with a Crucial SSD, short circuit in 5v line |
Coul I possibly use another IC instead of the 3545? Only found a 5 pack, and what use do I have for the other 4? |
Author: | bidomo [ July 2nd, 2015, 23:59 ] |
Post subject: | Re: Need help with a Crucial SSD, short circuit in 5v line |
well nevermind my previous post, it seems I've found both ICs in digikey, but there are a lot to choose from, I guess I will need a bit of help choosing the right parts... http://www.digikey.com.mx/product-searc ... 3801T50DCK http://www.digikey.com.mx/product-searc ... ?k=LTC3545 |
Author: | fzabkar [ July 3rd, 2015, 16:16 ] |
Post subject: | Re: Need help with a Crucial SSD, short circuit in 5v line |
Look up the full part number in the datasheet, determine the package style, and then compare its dimensions against the original part. Make sure you get the LTC3545 part, not the LTC3545-1. The "IUD" version appears to have industrial temperature specs, so the "EUD" part should be OK for you. The following appear to be the correct choices, but please verify them for yourself. http://www.digikey.com.mx/product-detai ... -ND/416765 http://www.digikey.com.mx/product-detai ... ND/1814424 The only other concern I have is in regard to the "CC" component. I don't recognise it, nor do I understand its function. |
Author: | fzabkar [ November 25th, 2017, 0:33 ] |
Post subject: | Re: Need help with a Crucial SSD, short circuit in 5v line |
MT41J128M16HA-15E:D, Micron, marking D9LGQ, FBGA96, DDR3-1333 SDRAM, 1.5V, 1.5ns, 16M x 16 x 8 banks: https://www.micron.com/~/media/documents/products/data-sheet/dram/ddr3/2gb_ddr3_sdram.pdf M25P80V6G, STMicroelectronics, serial flash memory, 8-VFQFN, "V" = 2.7 - 3.6V: https://www.jameco.com/Jameco/Products/ProdDS/321672-DS09.pdf MT29F128G08CFAAB, Micron, L74A NAND flash SN74LVC1G04, Texas Instruments, marking CC, single inverter gate, 1.65V - 5.5V, X2SON(4): http://www.ti.com/lit/ds/symlink/sn74lvc1g04.pdf |
Author: | fzabkar [ April 25th, 2019, 2:09 ] |
Post subject: | Re: Need help with a Crucial SSD, short circuit in 5v line |
Could we see the area of the PCB where the component was located? Perhaps the traces will provide a clue. |
Author: | fzabkar [ April 25th, 2019, 2:26 ] |
Post subject: | Re: Need help with a Crucial SSD, short circuit in 5v line |
The "CC" chip appears to be the "DRY" packaged version of the SN74LVC1G04. It is inverting the Reset pin of the adjacent PSU supervisor IC to produce 5VF. See the datasheet for confirmation. |
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