Gigabyte GTX 1070 8gb Founders edition missing to SMD ceramic capacitos - Page 1
Forum section: electronics / beginners

author: Koletsa
author_rank: Contributor
timestamp: October 08, 2021, 02:51:33 pm
content: Hello folks! Posting for the first time here, so if it is in the wrong place, I apologise in advance.As I said in the title, I have a Giga 1070 card, which is missing 2 ceramic capacitors (red circles on the pic). Can some one of you assist me in finding their right capacity so I know what to look for as a replacement. I know I could desolder one of the adjacent caps and measure it, but I keep that as a last resort measure. Thank you in advance! Looking forward to hearing from you.

author: richard.cs
author_rank: Super Contributor
timestamp: October 08, 2021, 05:13:54 pm
content: Are you certain there are supposed to be capacitors there? it is common to have pads for components which aren't fitted, e.g. to select different functionality on a single PCB layout. The way to check would be to compare with another known-good card (or photos of one).

author: Koletsa
author_rank: Contributor
timestamp: October 08, 2021, 06:54:23 pm
content: Hello! Yes, I'm certain. I googled the exact same model and there are caps on those 2 places. Also on the one bellow the gpu - one of the soldering sockets is missing the solder pad. I'm not aware how and why those caps were removed but is it a fine way to start repairing the card.

author: TheHolyHorse
author_rank: Regular Contributor
timestamp: October 08, 2021, 08:46:14 pm
content: Does it work as it should? If it does why even bother.

author: Vovk_Z
author_rank: Super Contributor
timestamp: October 09, 2021, 04:54:17 pm
content: Quote from: Koletsa on October 08, 2021, 02:51:33 pm1) I agree with the previous that there isn't a need to repair what is not broken. There may be redundant bypass caps on the PCB, and the manufacturer made homework to reduce excessive redundancy.2) Adjacent caps may have totally another rated value.3) You may only be sure desoldering these exact caps from the same card.4) Are they caps, but not resistors (for example)? I can't see clearly.

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 09, 2021, 07:16:47 pm
content: Unless I de-solder the chips on my board I cannot be sure because of measuring in circuit.The cap on right is 10uF.All the schematics I see only accurately show the value of the capacitor on the right.The SMD on the left in pic? not shown in same position.

author: HowdyPartner
author_rank: Newbie
timestamp: October 09, 2021, 07:32:39 pm
content: Has it been baked in an oven in an attempt to bring it back to life?

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 10, 2021, 12:04:54 am
content: OK, I just couldn't let it go...I am not really set up for SMD but I already had 2- EVGA GTX 1070 cards on my bench that I got back from a damaged delivery.The layout is exactly like the Koletsa's card in this area.So I removed that Capacitor on the left of the pic and measured it.And then I preceded to shoot it across the room off into space. LOLYou have to treat working on these size chips as you would watch parts.Build a side walled work area in white or green so parts can't go ricocheting off into the nether country and you can find them again.Oh well, Its a 22uF Capacitor.Maybe Santa will bring me JBC Nano tweezers for Christmas.Wouldn't that be something?

author: Koletsa
author_rank: Contributor
timestamp: October 10, 2021, 01:05:32 pm
content: Hello and thx for the assistance! I bought that card as non working at all - fans don't spin, rgb doesn't glow, the core and the ram chips, incl. the mosfets don't get warm. But the PC stats as if I don't have a vga in the slot. So I started exploring the pcb and I noticed those 2 caps missing.Then I star measuring and found new problems. I'm missing the 5 v completely. 12 and 3.3 v are both fine. Based on a scheme that I found on Repair Wiki, explaining the 5 v rail on Paskal GPU I understood that the 3.3 v are entering into one buck converter (I located it and the 3.3 v are entering there) but the 12 v are not and because ot that I don't get the 5 v anywhere on the PBC. The scheme shows that 12 v from the Bus should reach the convertor. The same scheme shows that between the Bus and the convertor should lay 2 caps. One of which most brobably is faulty. I checked the one tha lays right above the Bus itself and it is OK. But I'm not sure if it is one the two and which one it is exactly. Do you have any idea how can I find which of all caps are those two. I'm sharing below the scheme from repair wiki. I'd like to state that the components numbers there are not present ot my card - I don't have c501, nor c252. Thx in advance!

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 10, 2021, 02:13:58 pm
content: I don't believe the C501 and C252 are matching numbers on the 1070 card.C501 on 1070 PCB is part of stereo buffer circuit and C252 doesn't exist on this card.I'll take a quick look at the Wiki site and get back to you.

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 10, 2021, 03:09:40 pm
content: The wiki repair page is pretty specific about the area of 5V rail circuitry.Pictured in the upper left hand of the Front of the cardU2 is 8-Pin N-FET Linear Regulator Controller UCC3837u37 IS 5 PIN LDO Low Voltage Dropout regulatorI would be checking all the caps and resistors in that area and following the wiki 5V short pics

author: Koletsa
author_rank: Contributor
timestamp: October 10, 2021, 04:49:47 pm
content: Hello, Johnny10! Thx for the assistance again! I have 1 last favor to ask at that point - does any of your 1070 cards (I understood that you have 2 EVGA) have Samsung ram chips. I'd like to know the resistance of the Vmem inductor choke (R33). It says it should be between 30-60 oms, but Samsung chips were using lower voltage than microns, which meas that mine inductor should probably have higher resistance than the one for micron rams). Mine currently reads 0.2 oms. I have the same question about the 1.8v rail inductor - mine reads 1 om but it should be 800 oms+. Obviously those 2 inductors are damaged and I will replace them before I start fixing the voltage issues. And Yes, I read that the 1,8v goes straight to the Vcore and short on that specific choke most likely means dead core, but I'd like to excercise on it. Thank you in advance!

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 10, 2021, 05:34:21 pm
content: Yes, I can check that out later.I was thinking about your problems. I believe you should get all the voltages back to normal. Inducters don't go bad very often.If you checked the voltage going into the U2 IC and going out. You will know if it is because of bad Regulator or caps in the area.Do you have between 3 to10 volts on pin 2 of U2?Do you have 5 volts coming out of pin 3 or 5?Also one side of L1 should be at 5V

author: Koletsa
author_rank: Contributor
timestamp: October 10, 2021, 07:43:29 pm
content: Hello!1) Answers to your questions: on pin 2 (Vin) I have 0 volts; pin 3 (SW) = 0.192 v; pin 5 (boot)= 0.260 v. Also - pin 1 = 0.192 v; pin 6 = 3.302 v; pin 7 = 0; pin 8 = 0.030 v.2) On L1 I have 0.192 v (on both legs). I have that exact voltage on a lot of the nearby capacitors;2) I checked the pins also on continuity mode and I got beeps only at 4 (ground) and 2 (Vin). Does this mean I have a short on Vin and what would that mean?3) Just to make sure, I'm attaching the pick with the u2 module and the numbers of the legs as I measured them;4) In one of your previous posts you posted a scheme of the PBC in black and electric green with all the components and layers. What is that exactly and how/from where I can get such a scheme for my model?Thank you in advance!

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 11, 2021, 01:26:52 pm
content: Here is the location of the two PS 5V_12V In Signal caps.listed on your image as C501 and C252.C1100 22uF and the one to the right C1002 0.1uFI am always searching for schematics and other info on these cards of late.Have to get more organized as to where all this info originates.I believe a couple of youTube videos are geared towards the 1070 repair also.

author: Koletsa
author_rank: Contributor
timestamp: October 11, 2021, 04:56:39 pm
content: Hello again! You are a Saviour! I had my suspicions on the c1100 because there I have 0 volts on it but all the other caps of his size and shape nearby show some volts, so that made me wonder. Also, I'm not sure how visible is on the pic, but I think part of the ceramic layer is chopped off. I would never have gotten suspicious about the tiny ones to the right. Just to make sure - c1002 is the one that I marked (believing that c1001 is the one in the middle)? For the sake of the quest - I have 0 volts on both tiny caps next to the right from c1100.Also another question - If I have to replace my inductor chokes on the Vmem (R33) and the on the 1.8 v (R2R): are R33 and R2R standards for the induction of the chokes?P. S. I have watched several clips on faulty 1070 vga-a, but non of them had my problems. One had really low resistance in the R2R and it trourned out that the cause was the nvidia chip, which makes me a little bit worried. I also found some schemes for the pascal gpu but at this point am still awful at reading them and it is all Greek to me.

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 11, 2021, 05:33:00 pm
content: I have not set up a test board for this Graphics card as of yet.Have been tracing around board and reading up on the circuits for 5V line.For your questions... C1100 is connected to the first capacitor to the right C1102. The second SMD is a 49.9K resistor the third is another 0.1uF cap.They all travel over to the other side of the board to the PEX circuits R1007, R987 and back to Pin 2 of U2.Later today or early tomorrow I hope to power this board on and follow voltages.The 12 volt line comes from the first two pins on the PCIe connector. There is a direct connection to the bottom of C1100 and to Pin 2 of U2. So you should be able to check that also.

author: Koletsa
author_rank: Contributor
timestamp: October 11, 2021, 06:23:53 pm
content: It took me around a month to find good, yet affordable MB and PSU compatible with the spare CPU, RAM and cooling that I had for the set up of my board.At this point I'm ordering the capacitors and I hope I can complete the solder/resolder procedure without any unnecessary damage. I hope that fixes the lack of 12 v to the convertor and bring back to live the 5 v rail. Once again - I remove c 1100 and the tiny one right next to it?As soon as I have some results, I will write back. It may take some times, based on the availability of those components locally. Best regards!P.S. Just saw your pic. Yes, my 12 v form the PCI are fine. I have them on C44 (face side of the PCB, above and to the left of the 1st pin) and on C1078 (the one above your probe). That is why I believe one of those 2 capacitor must be faulty. Based on the appearance, it should be C1100.

author: wraper
author_rank: Unknown
timestamp: October 11, 2021, 06:55:35 pm
content: Changing capacitors won't fix anything and will not make 12V to appear. Even if those capacitors fail short, they would blow a fuse or something else in series with that 12 rail. Or if that rail was connected to 12V power input directly, just case the PSU to shut down due to overcurrent protection.So first you should check if that 12V rail is shorted to GND. And if it's shorted, then find what's shorting it. And find an open fuse, ferrite bead in series with that rail.

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 11, 2021, 07:06:20 pm
content: That's correct I have just laid out the connections to various components.Which components are good or bad need more testing of the circuit.Something is keeping proper voltage from going to the capacitor C1100 and to the input #2 pin of IC U2.

author: Koletsa
author_rank: Contributor
timestamp: October 11, 2021, 07:48:24 pm
content: Hello and thank for tuning in! My 12 v are present both on the PCI and the 6+2 PSU. The problem at this point is that the 12 v from the PCI don't reach the buck converter. I have 0 volts on pin 2 (Vin) and thus - my 5 rail doesn't exist. And based on the only scheme that I have found about the 5 v rail - between the 12 v from the PCI bus and the convertor lay only 2 capacitors (the scheme is for Pascal GPU's and it is for Repair wiki, see the attached pic, pls). I also tested for short to ground the first 3 pins on the pci bus and the C44 cap (the one that is tested on every video for the 12 v rail). If you have any knowledge on the matter, I will be very thankful if you share it. Thank you in advance!

author: wraper
author_rank: Unknown
timestamp: October 11, 2021, 07:54:01 pm
content: Capacitors are in parallel with the rail, they have nothing to do with supplying voltage to this rail. You need to measure if the rail is not shorted and from where the voltage comes from.

author: Koletsa
author_rank: Contributor
timestamp: October 11, 2021, 09:47:42 pm
content: Hello, wraper! Thanks for the info. I read a little bit more and I got your point. Back to square 1 I guess. I obviously have to find a faulty resistor. Thx for the advice!

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 11, 2021, 10:56:23 pm
content: I thought you knew you had a short on the line when you said you got a beep on Pin 2 and Pin 4 earlier in your posts?It means one of the capacitors died short or the controller is bad or something connected to the controller is bad.I found the schematic for the 5V line though the voltage regulator with accurate numbering for our card including the high side load switch.Better than trying to follow the generic one you have been using.

author: Koletsa
author_rank: Contributor
timestamp: October 12, 2021, 06:21:00 am
content: I knew about the short, but believed that the reason was one of the two capacitors we talked about. Then Wrapper said it can't be a cap, because they are parallel to the rail. Can you share the 5 v rail scheme so I can start looking for the culprit as well?

author: wraper
author_rank: Unknown
timestamp: October 12, 2021, 08:40:48 am
content: Quote from: Koletsa on October 12, 2021, 06:21:00 amCap can short the rail, although it happens not very often. Failing semiconductors are way more common. Short likely is an initial failure, however removing the short by itself will not fix the card. Since there must be also something blown in series with the rail.

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 12, 2021, 11:12:13 am
content: If you will notice this schematic shows C1100 and C1102.Best of Luck

author: Koletsa
author_rank: Contributor
timestamp: October 12, 2021, 05:31:12 pm
content: Thank you very much! Here on that schematics I see resistor... which I should find on the board. Anyhow - very helpful aid. Thanks a lot!

author: Koletsa
author_rank: Contributor
timestamp: October 12, 2021, 05:34:53 pm
content: I guess you are right. But need some kind of plan and at this point is to fix the 12v to the Vin of the converter. What will happen from then on, we will see. Thanks again for the info! If you have any other suggestions, pls feel free to share them.

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 12, 2021, 06:05:41 pm
content: Read through the Wiki Repair Article on the Pascal 1.8V line, it has a very good analysis of problems.From bad Resistor which I guess is common to bad controller.There is a lot of good information on the site you chose.You do have 3.3 coming into controller.Its interesting that you have zero volts on Pin 2. I would think if something were dragging it down there would be something there?Not simply zero.I get .3168 Ohms from Pin 2 on PCIe to U2 Pin2. If I remember correctly?I am in the middle of another project at the moment but I will check later.Well the adventure begins, anew.

author: Koletsa
author_rank: Contributor
timestamp: October 12, 2021, 07:16:26 pm
content: Hello! Yes, I have 3.200-3.300 v on pin 6. As for your second question - from pin 2 (also 1 and 3) on the PCIe to pin 2 on the convertor I have 6+ mega Ohms, decreasing steadily. The strange thing (at least for me) is that the resistance is dropping constantly. I started to write my answer at 6+ mOhmes, then i checked again few mins later - it was at around 3, not it is at 1,5 mOhms.Take care of your projects. I have a lot of reading to do, so I'm, not in a hurry.

author: Koletsa
author_rank: Contributor
timestamp: October 14, 2021, 09:45:33 am
content: UPDATE: I managed to fix the short to ground. The culprit was c1100 - after removing it I no longer have short on pin 2 (Vin) on the buck converter. I even have some voltage there - little less that 2 v. Now I have to find where are my other 10 v that I need on that pin.

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 14, 2021, 01:13:15 pm
content: After removing did you check the value of C1100 ?

author: Koletsa
author_rank: Contributor
timestamp: October 14, 2021, 04:09:00 pm
content: Yes, I got O.L. It was obviously dead. I hope it was 22uf. Now I have to find out what makes the voltage to drop. By measuring I found out that one of the resistors on the rail to pin 2 (Vin) on the buck convertor - R987 - gets on one of his legs 12 v, but on the other my multimeter measured 1.6-2 v. Exactly the same voltage that gets to pin 2. The resistor is 0 or 000, which makes it most logical that he is faulty as well, because 0 omh resistor shouldn't lose 10 v and drop the voltage from 12.10 to below 2 v. But I'd like to do a little bit more reading before dismounting it, because the mount process with those smd-s is pain in the ...

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 14, 2021, 05:18:43 pm
content: It said in the troubleshooting description that resistor failure is common.Maybe it was acting as fuse?Jump around it and see.

author: Koletsa
author_rank: Contributor
timestamp: October 14, 2021, 07:52:54 pm
content: The first thing I have in mind is to desolder it and replace it by a single, simple wire, because I read that 0 ohms are basically that - a single wire in a body. What do you mean by "jump around it" exactly?

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 14, 2021, 08:30:36 pm
content: I'm laughing right now!!Look what I just found today at 4:30PMA video about missing 5V on 1070 card.And he had C1100 shorted.And R987 0 ohm resister showing high resistance.Take a look.Same as what we determined already.Hope this is your cards only problem.

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 14, 2021, 09:05:34 pm
content: I believe you could just measure Ohms across the resistor in place.Should be low resistance. I get 0.027 Ohms on R987.

author: Koletsa
author_rank: Contributor
timestamp: October 14, 2021, 09:13:55 pm
content: Ha, Tech cemetery. I know the channel. Now, after I looked at the video, I think I have watched before, but totally forgot about it. I hope I have the same problem. On mine r987 I have 600+ mOhms now. I measured another random o Ohms resistor - 2 ohm, which I believe is ok. Tomorrow I will try to find 0603 0 Ohms resistor and see what will happen! Will keep you posted.

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 14, 2021, 09:20:38 pm
content: Yes, To measure this low resistance you need to zero your meter first.You could solder a thin wire across the top of the resistor to quickly check if 12 volts is present and controller starts..

author: Koletsa
author_rank: Contributor
timestamp: October 15, 2021, 04:12:50 pm
content: Hey, I have a good news and a bad one. The good new is that I managed to replace the 0 Ohms resistor and now I have my 5v, 1.8v and 1v PEX. I have the 0.7 on the Vcore. The bad news is that I don't have any voltage on my Vram. While I'm looking at the schematics, could you please do me a favor and measure the resistance of the R33 inductor. Mine currently show 0.1 Ohms. Also my 1.8 v inductor shows 7.5 Ohms resistance instead of the 800+ Ohms stated in the Wiki repair, but I get the voltage I need there. Should I be worried about its resistance? Could you also check Q 13 (right next to the Vram choke). I have 12 v on the top 2 right legs, 0.200 v on the right bottom one, on no voltage on the lest legs. Is the same case back to you. Tnahks in advance!

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 15, 2021, 04:29:58 pm
content: Yes, Sorry about that I was reading it wrong.You have 1.8VRS3 Yes measures quite low 0.02 or lower.Inductors are supposed to be very low to zero.

author: Koletsa
author_rank: Contributor
timestamp: October 15, 2021, 04:45:50 pm
content: I read that as well. Not sure yet. At this point the Voltage I get to the Vcor is 0.7v as it should. Also my Chip get hot on all its surface, not only in the bottom left corner. And also the is a small change that (I guess 5%) that the bios chip is dead and replacing it may fix the issue. But first I need to get some voltage to the Vmem. After that I will figure out the next step.Update: I managed to f%%% things up - I guess I shorted something while measuring the voltages across the boards, because I got a spark, followed by smoke. Now my PEX rail has 2v instead of 1v and gets very hot. All my choke inductors are with messed up resistance and once chip (right above the PEX inductor) got e fracture. At that point I'm about to sell the cart as non working and for parts.Thank you a lot for all the help. Much appreciated!!!

author: Johnny10
author_rank: Frequent Contributor
timestamp: October 16, 2021, 04:31:25 pm
content: That is disappointing.