identifying RTX 2080 Ti graphics card missing components - Page 1
Forum section: electronics / repair

author: newmaster
author_rank: Contributor
timestamp: July 10, 2020, 04:45:00 pm
content: Hey, I took a huge risk, buying a broken MSI GeForce RTX 2080 Ti Gaming X Triothere are some PCIe decoupling caps missing, but also 2 components that I have been unable to identify yet. maybe somebody here can help me with it?I attached a photo of a good board from the interwebs, marking the area of missing components and also a photo that marks the 2 mystery components.one of them is most likely a resistor. it would be great if someone knows the value of it. otherwise the plan is to solder on a 20 turn potentiometer and try different values from high to low resistance. until it hopefully starts working.but for the white component.. I have no idea what it could be. an inductor perhaps? or maybe just a LED? I can´t find better photos of this area of the card. maybe there are even some markings on the components. or somebody just has a dead card and can desolder and measure the marked parts?also, if somebody has totally destroyed his or her card beyond the repair, I may be interested in buying a slice of that PCB

author: jc101
author_rank: Frequent Contributor
timestamp: July 10, 2020, 05:25:42 pm
content: Hmm, that looks different to this YouTube of someone going through the hardware of one of thoseMight be worth a look for generic pointers, there are some links to high res pictures of the PCB in the comments.

author: wraper
author_rank: Unknown
timestamp: July 10, 2020, 05:34:35 pm
content: Quote from: newmaster on July 10, 2020, 04:45:00 pmShould be C0G type ceramic capacitor, thus should have low capacitance, most likely below 1nF considering it's size.

author: Mr. Scram
author_rank: Super Contributor
timestamp: July 10, 2020, 06:08:09 pm
content: If only decoupling capacitors are missing it may be bad news. Few will cause the card to stop working.

author: wraper
author_rank: Unknown
timestamp: July 10, 2020, 06:21:56 pm
content: Quote from: newmaster on July 10, 2020, 04:45:00 pmThose are AC coupling capacitors, nothing to do with decoupling.

author: newmaster
author_rank: Contributor
timestamp: July 10, 2020, 06:41:56 pm
content: Quote from: wraper on July 10, 2020, 06:21:56 pmYep, thanks for the correction. I knew what they are for, but somehow consistently made that mistake in writing :/Quote from: wraper on July 10, 2020, 05:34:35 pmI desoldered a different cap from a visually similar part of the circuit. only way to measure this low capacity is my oscilloscope. the cap seems more like something between 1-2pF. unfortunately the measuring setup itself measures about 15pF and changing with every movement of any wire. so it is impossible to get more precise with my setup. I practiced with known capacitors to validate my method.how important can it be to get the value exactly right?

author: newmaster
author_rank: Contributor
timestamp: July 21, 2020, 07:13:02 pm
content: also, another missing resistor should be crossing PCI express pins A6 and A7 (correspondingly JTAG3 (TDI) and JTAG4 (TDO) according to this page:https://pinouts.ru/Slots/pci_express_pinout.shtml)I don´t know anything about JTAG, but since it is a standard protocol, then maybe somebody can lead me to a right direction.attached a photo showing the location of the unknown resistor and all the information I already know.