Nvidia GTX 780 schematic / component ID - Page 1
Forum section: electronics / repair

author: ricendres
author_rank: Newbie
timestamp: April 12, 2020, 07:21:55 pm
content: Hello, recently there was a tragedy with my video card .... I was cleaning the PC and I dropped it from a small distance. but the board hit the back on a pin of the case and broke 2 smd capacitors and 1 resistor ..Does anyone know where I get the scheme to find out the values ​​of these components?photo that was brokenred circle locationI really need help, because at the moment it is complicated to buy a new one. My dad has an electronics and can fix it if he knows the values ​​of the components or if he has the schematicI found this photo of a similar sign on the internet

author: Manul
author_rank: Super Contributor
timestamp: April 12, 2020, 07:47:23 pm
content: Please look and analyze these sections.

author: ricendres
author_rank: Newbie
timestamp: April 13, 2020, 07:48:28 pm
content: thanks so much

author: PKTKS
author_rank: Super Contributor
timestamp: April 13, 2020, 07:48:57 pm
content: Quote from: ricendres on April 12, 2020, 07:21:55 pmSchemas for video cards are not easily found probablyif they found one they will prosecute you for life..It is far cheaper simpler and effective if you justbuy a faulty card and they are very similar regarding brandand GPU modelsOr even buy a wholesale of them - very commonfor spare partsPaul

author: M0HZH
author_rank: Regular Contributor
timestamp: April 14, 2020, 12:27:57 am
content: The schematics are not public.Those resistors and capacitors are associated with the GDDR5 memory chips on the other side of the PCB. That card is using 12 memory chips and each has the same parts (a few resistors and a few capacitors) associated with it. The PCB layout usually is repeated for the positioning of these chips, so there are other areas on the board with the same parts and same positioning. I've circled in blue the areas that look similar, you just need to look at those, measure the resistors and capacitors and order same value replacements.My guess is the resistors are differential CK bus terminations and they should all be the same value (240 ohm / 120ohm / 60ohm depending on the arrangement). Capacitors are probably decoupling, something like 10nF MLCC.

author: ricendres
author_rank: Newbie
timestamp: April 14, 2020, 01:46:26 am
content: Thank you very much for all these tips. I believe that with all this information we can recover my video card

author: gorge441
author_rank: Contributor
timestamp: April 16, 2020, 04:58:47 pm
content: Please buy a new one.

author: ricendres
author_rank: Newbie
timestamp: April 18, 2020, 12:53:58 am
content: Unfortunately my situation is financially complicated in the last few months and I will not be able to buy another one.

author: Manul
author_rank: Super Contributor
timestamp: April 18, 2020, 01:24:55 am
content: ricendres, do not feel bad about someone's useless comment. How the repair going?

author: ricendres
author_rank: Newbie
timestamp: April 18, 2020, 01:35:18 am
content: Not yet, I'm looking for compatible components,thank you for your help

author: TiN
author_rank: Super Contributor
timestamp: April 18, 2020, 06:28:50 pm
content: Upmost right cap is 1uF, then right bottom broken part is 121 ohm 1% resistor and left broken cap is 10nF. All parts are 0402 size, you can buy them from Digikey/Mouser/etc.You can ignore 1 uF capacitor, it's just for filtering power, but resistor and 10 nF one are kinda important.