RTX 4090 Repair Sydney

Home › Services › GPU & Graphics Card Repair Sydney › RTX 4090 Repair Sydney

Computer Repairs Pronto fixes RTX 4090 graphics cards at component level on our Sydney repair bench, from melted 16-pin power connectors and failed power stages to GDDR6X memory faults, artefacting, no display, short circuits and damage around the PCIe slot. Nothing is replaced until testing has found the part that failed, and the quote you approve is for that part.

Bring the card to our workshop near Castle Hill by arrangement, or post it from anywhere in the country through our Australia-wide mail-in GPU repair service. For other models, start at our graphics card repair Sydney page.

Request an RTX 4090 repair assessment

RTX 4090 Faults We Diagnose and Repair

Most RTX 4090 faults trace back to power delivery, memory, firmware or physical damage, and on this card the power input and the PCIe slot area deserve a closer look than usual. The quote always comes from what testing finds, not the symptom.

RTX 4090 Melted 16-Pin Connector Repair

A melted 16-pin connector on an RTX 4090 can usually be replaced, from $370, but the repair is only finished once the 12V input and the power stages behind it have been checked. A connector that ran hot enough to melt may have damaged more than its own plastic.

The RTX 4090 takes its power through a single 16-pin connector (12VHPWR) instead of several 8-pin plugs; the Founders Edition uses one, and so do partner cards such as the ASUS TUF Gaming. Here is what the repair covers:

1. Inspection. The socket, the board around it and the cable's plug are examined under magnification for melting, charring and pushed-back pins.
2. Cold checks. The 12V input is measured for a short. On the Founders Edition, Igor's Lab's teardown shows the three 12V feeds passing through three current-sensing shunt resistors before they join, so those shunts and their traces are checked for heat damage.
3. Removal. The damaged connector comes off and the pads are cleaned. Carbonised board material can conduct, so it is removed, not covered over.
4. New connector. A new 16-pin connector of the correct type for that board is fitted and every pin checked.
5. Power stages. A shorted or damaged stage found in the cold checks is replaced too, from $430, and added to the quote before you approve it.
6. Load test. Full power on a known-good cable, with a thermal camera on the new connector.

Replace the melted cable or adapter as well, and check its other end at the power supply. A melted plug fitted to a new socket risks repeating the damage.

What Was Reported About the RTX 4090's 16-Pin Connector

Within weeks of the RTX 4090's October 2022 launch, owners began reporting melted 16-pin plugs, and the investigations that followed pointed mainly to plugs that had not been pushed fully home. The connector standard was later revised. The timeline:

For a working card:

• Seat the plug fully, with no gap at the socket and the latch engaged.
• Keep the cable straight for a short run before it bends, so it is not levering the plug sideways.
• Check with a torch rather than unplugging it. Gamers Nexus suggested repeated removal may have added debris or left plugs unseated.
• Using an angled adapter? Check it is not one of the recalled CableMod models.

RTX 4090 Memory Layout: How It Differs From the RTX 3090

The RTX 4090 holds its 24GB in twelve 2GB GDDR6X chips, all on one side of the board around the GPU, so it has none of the rear memory that runs hot behind an RTX 3090's backplate. That changes where thermal work on a 4090 is focused.

On the bench, that layout means:

• Memory heat is a front-side job. Hot memory points to the pads and contact under the main cooler, not the backplate.
• Pad thickness affects the GPU too. Memory and GPU share one cooler: pads too thick hold it off the GPU, pads too thin leave the memory without contact. Each gap is measured.
• Original pads are usually replaced. Igor's Lab described the Founders Edition's memory pads as thick and crumbly, and pads like that rarely survive a strip.
• Errors point to one chip. Twelve chips on a 384-bit bus give each its own 32-bit slice, so there is no front-or-rear pair to separate as on a 3090.
• The back still matters. A Founders Edition carries its power controller on the rear of the board.

For the older card's rear memory, see our RTX 3090 repair page.

RTX 4090 No Display Repair

An RTX 4090 that gives no picture is usually repairable if the AD102 GPU itself is healthy; the likely culprits are a failed power stage, damaged firmware, a fault near the PCIe slot or the output circuitry. What happened just before it stopped is often the best clue.

Spinning fans need only 12V and a small fan controller, so they keep turning on a card whose core supply is dead.

RTX 4090 Artefacting

Artefacts on an RTX 4090, meaning coloured blocks, lines, sparkles or broken textures, usually come from one of the twelve GDDR6X chips, the memory's power supply or poor cooler contact. When they appear tells you more than how they look.

• On the boot screen, before Windows: a hardware fault on the card.
• Only once warm: a chip or joint failing at temperature, or memory too hot from poor pad contact.
• After a driver update, or also with another card: look at software and the rest of the PC first.

Artefacts straight after a home repaste or water-block fit often mean pads that are not touching. Our GPU artefacting guide covers the checks to try at home.

RTX 4090 GDDR6X Memory Repair

A failed GDDR6X chip on an RTX 4090 can be replaced individually, from $530, provided the correct 2GB chip is available for that card. If the right chip has to be ordered, bench time depends on supply, and you hear about it before approving anything.

1. Testing, cold and warm, finds the slice of the bus producing errors and the chip on it.
2. The memory supply is checked, so a good chip is not replaced because of a bad supply.
3. With the board preheated and neighbouring parts shielded, hot air at a controlled temperature lifts the chip.
4. The pads are cleaned and levelled and a new 2GB GDDR6X chip of the correct type fitted.
5. All twelve chips are retested under load, then measured pads and fresh paste go in.

A second chip, or a chip plus a power fault, is in the quote before work starts.

RTX 4090 Power Stage Repair

The RTX 4090 is rated at 450W, and the power stages that turn 12V into the core and memory supplies handle nearly all of it, so they are among the first parts checked on a dead card; repairs start from $430. A power stage, often called a smart power stage or DrMOS, packs the switching MOSFETs and their driver together.

• Founders Edition: NVIDIA described 20 power phases for the GPU and 3 for the memory. Igor's Lab's teardown identified MP86957 power stages, each rated up to 70A, run by an MP2891 controller on the back of the board.
• Partner boards: stage count and layout differ by maker, and replacement stages follow the board in front of us.
• After a melted connector: input-side stages are tested even if the card still starts.

The failed stage is located with a thermal camera, replaced with a matching part, and its neighbours, controller and capacitors checked. Each rail is then brought up current-limited before a sustained full-power run.

RTX 4090 Short Circuit Diagnosis

A shorted RTX 4090 is diagnosed without powering it normally: each rail is measured to ground with the power off, and the failed part on the shorted rail is then found with a thermal camera. That keeps a single failed part from becoming several.

RTX 4090 Weight, Sag and Damage Near the PCIe Slot

RTX 4090 cards are heavy, about 2.2kg for the Founders Edition and more for some partner cards, and cracked boards near the PCIe slot have been reported on some of them. Weight hangs off the slot and the bracket, and the board takes the strain.

• Founders Edition: Tom's Hardware lists it at 2,186g; it measures 304 x 137 x 61mm and takes three slots.
• Partner cards can be bigger: Guru3D measured the ASUS TUF Gaming at 348.2 x 160 x 72.6mm, 3.5 slots and just over 2.3kg.

What has been reported:

• December 2023: TweakTown reported that the US repair channel NorthridgeFix had received 19 RTX 4090s from one customer, most cracked near the PCIe slot's retention latch, all of those ASUS models. The cause was not established; the cards' weight and rough transport in pre-built systems were suggested.
• February 2024: Guru3D, KitGuru and The FPS Review reported that Gigabyte had revised its RTX 4090 and 4080 Gaming OC board (revision 1.1) with more board area around the PCIe locking tab, after owners reported cracking there.

On the bench, knocked-off parts and damaged edge contacts near the slot can usually be repaired, from $370. A crack is different: these boards have many layers (TweakTown's report said 12 to 15), and a crack that has broken inner-layer traces is often not reliably repairable. The diagnostic tells you which you have.

To protect a working card, use a support bracket if one came with it, and take the card out before the PC is moved or shipped.

RTX 4090 Shutdowns and Crashes Under Load

An RTX 4090 that crashes or switches the PC off only under heavy load has a fault on the card, a cooling problem, or a power supply or cable that cannot keep up with a 450W card. The last two are worth ruling out before sending anything.

• Power supply: NVIDIA recommends at least 850W, based on a Ryzen 9 5900X system, and notes the figure changes with the rest of the system.
• Cabling: NVIDIA lists three PCIe 8-pin cables into the supplied adapter, or one 450W-or-greater PCIe Gen 5 cable. Give each adapter input its own cable rather than splitting one across two.
• The plug: fully seated and not pulled sideways, as in the connector section.
• Whole PC off, or just the game? A full switch-off points first at the power supply; a driver reset points more at the card or its cooling.
• Temperatures: a hotspot far above the GPU reading suggests poor cooler contact.

A card that passes the full bench test costs you only the $150 diagnostic, and the results show where else to look.

RTX 4090 vs RTX 4090 D

The RTX 4090 D is a China-market version of the 4090 with fewer CUDA cores and a lower power rating, built on the same AD102 GPU with the same 24GB memory layout. NVIDIA released it in December 2023 to meet US export rules that stopped the full 4090 being sold in China.

Connector, power and memory work is the same on both. Firmware is always matched to the exact card and variant; GPU-Z or the driver shows which one you have.

Founders Edition and Partner RTX 4090 Cards

We repair NVIDIA's Founders Edition RTX 4090 and partner cards from ASUS, Gigabyte, MSI, Zotac, PNY, Galax, Palit, Gainward, Inno3D, Colorful and others. Design differences decide how each is stripped and what parts it takes.

If your partner card has a BIOS switch and died after a firmware update, try the other position, with the PC off, before sending it.

How We Diagnose an RTX 4090

An RTX 4090 is diagnosed in order from the least invasive check to the most, so testing does not add to the damage. Steps that do not fit the symptom are skipped.

1. Look first. The 16-pin socket under magnification, the slot area for cracks, and both sides for burnt or missing parts and earlier work.
2. Measure cold. The 12V input and every rail to ground, unpowered.
3. Power up limited. A bench supply caps the current so a hidden fault cannot spread.
4. Follow the rails. Each supply checked in its power-up sequence.
5. Check firmware against the right image for that board, where the symptom calls for it.
6. Test memory. All twelve chips, cold and warm.
7. Reproduce heat faults by running the card hot or warming a suspect area.
8. Quote. The fault, the fix, a fixed price and an honest view on whether it is worth it. Nothing proceeds without your go-ahead.
9. Repair and prove it, ending with a long full-power run and the connector on a thermal camera.

What RTX 4090 Faults Can Be Repaired?

Most RTX 4090 faults can be repaired at board level, but a failed GPU core or a crack through the inner layers of the board usually cannot be repaired economically. Faults that are usually repairable:

• Melted or damaged 16-pin power connectors
• Failed power stages and input parts
• Failed GDDR6X chips, subject to the correct chip being available
• Parts knocked off near the slot or during a water-block fit
• Damaged PCIe edge contacts and display ports
• Corrupted or mismatched firmware
• Overheating from worn pads and dried paste

Often not worth repairing:

• A failed or cracked AD102 GPU. A replacement core would have to come from a salvaged card, which makes the job costly and uncertain; warranty is the better route if you have it.
• A crack through the board's inner layers (see weight and sag).
• Burn damage through the board under a connector or power stage.
• Several major faults at once, or damage from an earlier repair attempt.

If that is your card, you pay the $150 diagnostic and any return postage, nothing else, and get an explanation of what failed.

RTX 4090 Repair Cost

RTX 4090 repairs start from $330, a melted connector from $370, and your final price is fixed in the quote before any work starts. Call 02 8428 9224 with the card model and the fault for a starting price.

A melt that harmed nothing behind the connector is priced as connector work; if a power stage failed too, both appear in one quote. Interstate customers also pay postage both ways.

Is Your RTX 4090 Still Under Warranty?

Check before you send it anywhere: a 4090 bought new later in its life may still be inside the maker's warranty, and if it is, the retailer you bought it from is your first stop. Launch-day cards from October 2022 are now four years old, but plenty were sold well after that.

• Find the term. Warranty periods differ between brands and regions; check the maker's Australian warranty page against your receipt date.
• Consumer guarantees. Your rights under the Australian Consumer Law sit with the retailer, and the ACCC says the guarantee of acceptable quality usually still applies after a warranty expires. On a card this expensive, it is worth asking.
• Melted connectors. NVIDIA's November 2022 offer of an expedited RMA was made then; ask the retailer or maker what applies to your card now.
• Second-hand cards. Check the maker's proof-of-purchase terms before assuming either way.

Our repair is for the card with no warranty path left.

Is an RTX 4090 Worth Repairing?

Almost always, if the GPU and board are sound: the RTX 4090 holds its second-hand value well, so most repairs cost a small part of what a working card sells for. Compare your quote with recently sold listings for working 4090s, not asking prices.

As an illustration: if working 4090s are selling for around $2,500 near you, a melted connector from $370, even with a power stage added, is a small share of that value, and a memory chip from $530 or a reball from $630 still leaves a wide margin.

• Usually worth it: a connector, power stage, single memory chip, firmware or thermal fault on an out-of-warranty or second-hand card. Our replaced parts come with 12 months' warranty against the same fault; a used replacement card comes with an unknown history.
• May not be: a failed GPU core, a board cracked through its inner layers, or several major faults whose total approaches a big slice of the card's value.
• Not yet: a card still under warranty or with a consumer guarantee claim open. Go to the retailer first.

RTX 4090 Repair Turnaround

An RTX 4090 usually spends one to ten business days on the bench, depending on the fault.

A job waiting on a part, such as a memory chip, depends on supply, and you know that before approving the quote. Posted cards also spend time in transit each way; the mail-in graphics card repair page lists Australia Post estimates by state.

What Happens After an RTX 4090 Repair?

A repaired RTX 4090 is tested at full load before it leaves, and you get a plain account of what was replaced and why. Every output is checked, then a long full-power run logs temperatures while a thermal camera watches the 16-pin connector.

Once the invoice is paid, collect the card by arrangement or have it posted back on your prepaid label, or with return postage added to the invoice at cost.

Warranty: 12 months on the parts we replace, for the same fault. If a replaced part fails within the year, the card comes back to us and the part is covered. Seat the plug fully and support the card to look after the repair.

Typical RTX 4090 Repair Scenarios

These are fault patterns RTX 4090 owners bring to a repair bench, with what testing usually finds and what the repair involves. They describe types of fault, not any one customer's card: yours is quoted on its own findings.

RTX 4090 Repair in Sydney

Sydney owners can drop an RTX 4090 at our workshop near Castle Hill in the Hills District, by arrangement.

• Open: 8am to 6pm, Monday to Saturday.
• First step: send the form below or ring us. You get the likely cause, the starting price, a job number and the workshop address.
• Bring the card in an anti-static bag. If the power plug melted, bring the cable or adapter as well, or a clear photo of its plug.

Our Sydney GPU board-level repair page covers the rest of the models we work on.

Interstate RTX 4090 Mail-In Repair

An RTX 4090 can be posted to our Sydney repair bench from anywhere in Australia, and it comes back the same way once repaired and tested. There are no workshops in other cities; every card is repaired on the same bench.

1. Send the form below or ring 02 8428 9224 to get a job number, the workshop address and a starting price.
2. Pack the card only, cooler fitted, in an anti-static bag inside a sturdy box with at least 5cm of padding on every side and the job number inside. At over 2kg, a 4090 must not be able to shift.
3. You get a message when it lands, then the diagnosis and a fixed quote. No work starts without your approval.
4. After repair and testing, it goes back on your prepaid label or with return postage added to the invoice at cost.

You choose the postage service and pay it both ways; on a card of this value, insured cover such as Extra Cover is worth the cost. Full packing steps are on the Australia-wide GPU repair page, with postage notes for Melbourne, Brisbane, Perth, Adelaide, Canberra, Hobart and Darwin.

Frequently Asked Questions

Can a melted RTX 4090 power connector be repaired?

Yes, in most cases. The melted 16-pin socket is removed, the board under it cleaned and checked, and a new connector fitted, from $370. The 12V input and power stages behind it are tested too; a failed stage is replaced from $430 and included in the quote before work starts. Replace the melted cable or adapter as well.

Why did my RTX 4090 power connector melt?

Investigations in late 2022 pointed mainly at plugs that were not fully seated. Gamers Nexus found a partly inserted plug, especially one pulled at an angle, could overheat, and that debris could contribute. NVIDIA said a common issue was connectors not fully plugged in. The later 12V-2x6 standard shortened the sense pins to guard against this.

Does the RTX 4090 have memory on the back of the board like the RTX 3090?

No. The RTX 4090 uses twelve 2GB GDDR6X chips, all on one side of the board around the GPU, cooled by the main cooler. The RTX 3090 splits twenty-four 1GB chips across both sides, with the rear ones cooled only through the backplate.

How much does an RTX 4090 repair cost?

Thermal service or firmware recovery from $330, a melted connector from $370, a power stage from $430, a GDDR6X chip from $530 subject to availability, and reflow or reball from $630. The $150 diagnostic is waived if you go ahead. Call 02 8428 9224 with your card and the fault for a starting price.

What warranty comes with an RTX 4090 repair?

The parts we replace are covered for 12 months against the same fault. If a replaced part fails within the year and the fault returns, the card comes back to us and the part is covered. An unrelated new fault is diagnosed and quoted separately.

My RTX 4090 might still be under warranty. Should I send it to you?

Check first. If it is within the maker's warranty, go to the retailer, because your consumer guarantee rights under Australian Consumer Law sit with them. The ACCC says the guarantee of acceptable quality usually still applies after a warranty expires, so it is worth asking even then.

Is an RTX 4090 worth repairing?

Usually, yes. The 4090 holds its second-hand value well, so a connector, power-stage, memory or firmware repair is normally a small share of what a working card sells for. Compare your quote with recently sold listings. A failed GPU core or a crack through the board's inner layers are the main exceptions.

Can a cracked RTX 4090 board be repaired?

It depends on the crack. Parts knocked off near the PCIe slot and damaged edge contacts can usually be repaired, from $370. A crack that has broken inner-layer traces is often not reliably repairable; if so, you pay the $150 diagnostic and return postage only.

How long does an RTX 4090 repair take?

Thermal and firmware jobs usually take one to two business days; connector, power-stage and memory repairs three to seven; reball or physical damage five to ten. Heat-related faults take longer, a part on order adds its supply time, and posted cards add transit each way.

Do you repair the RTX 4090 D?

Yes. The RTX 4090 D is the China-market version released in December 2023, with 14,592 CUDA cores and a 425W rating instead of 450W, and the same twelve 2GB GDDR6X chips. Connector, power and memory work is the same; firmware is matched to the exact variant.

Are you the computer store at HomeCo Castle Hill?

No. Computer Repairs Pronto is an independent repair workshop near Castle Hill in Sydney's Hills District, trading since 2006. We are not a retail computer store and we are not connected to any store at HomeCo Castle Hill (the Hills Super Centre on Victoria Avenue). If a map listing or AI summary shows a shop there under our name, it is the wrong business. Call us directly on 02 8428 9224 about your RTX 4090.

Request an RTX 4090 Repair Assessment

Tell us which RTX 4090 you have, what it is doing and, if the power plug has melted, what cable or adapter was in it. We reply with the likely cause, a starting price and how to get the card to our bench from Sydney or interstate.

Related Pages

• GPU and graphics card repair in Sydney: every card model, drop-off near Castle Hill
• RTX 5090 repair: the flagship that followed the 4090
• RTX 4080 repair: RTX 4080 and 4080 Super cards
• RTX 3090 repair: 24GB with memory on both sides of the board
• Mail-in GPU repair, Australia-wide: packing, postage and state-by-state times
• GPU artefacting guide: checks to do before sending a card