GPU Repair Hong Kong: RTX 5090 FLIR & BGA Reball Guide 2026
Introduction
A graphics card fails for a reason. It is almost never random. In my 15 years fixing GPUs in Hong Kong, I have seen maybe three cards that died without a traceable cause. The rest? Heat, moisture, or power. That is it.
Hong Kong is brutal on electronics. Summer humidity sits above 80% for months. Air conditioning runs cold, then you step into a 33°C street, then back into a chilled office. That thermal cycling stresses every solder joint on your PCB. Add a 450W RTX 5090 running Cyberpunk at 4K and you have a recipe for cracked BGA balls, dried thermal paste, and VRAM that quietly cooks itself.
This guide covers what I actually do on the bench: FLIR thermal imaging to find dead shorts, BGA reballing to fix cracked GPU cores, PCB trace repair for water-cooling leaks, and honest repair pricing in HKD. No marketing fluff. Just what works.
What Is FLIR Thermal Imaging in GPU Repair?
FLIR thermal imaging in GPU repair is a diagnostic method that uses an infrared camera to detect temperature anomalies on a graphics card PCB, pinpointing short circuits, dead VRAM chips, and faulty VRM phases within seconds. Instead of blindly probing with a multimeter, I power the card through a current-limited bench supply and watch the FLIR screen. A working card spreads heat evenly. A faulty one shows a bright white spot — that is your short. According to ComputerKing internal statistics, FLIR reduces diagnostic time on dead GPUs from 45 minutes to under 8 minutes, and improves first-time fix accuracy by roughly 70%.
Here is the thing: most repair shops in Hong Kong still diagnose by swapping parts. That works for fans and cables. It does not work for a card that will not POST. You need to see heat.
How Does BGA Reballing Fix a Dead RTX 5090 or RTX 4090?
BGA reballing fixes a dead GPU by removing the graphics core or memory chip from the PCB, cleaning the old solder balls, re-applying fresh solder spheres, and reflowing the chip back onto the board with a controlled temperature profile. This restores cracked or cold solder joints that cause black screens, no-display faults, and intermittent booting. On RTX 5090 and RTX 4090 cards, the GPU die runs at 80-90°C under load, and repeated heating and cooling cycles can crack the microscopic solder balls underneath. A proper reball uses a preheater at 150°C, a top heater at 220-240°C, and leaded or high-temp SAC305 solder depending on the original spec.
I have done over 400 BGA reballs on Hong Kong cards. The success rate depends heavily on how early you bring the card in. If the card still boots sometimes, we are looking at an 85% fix rate. If it is completely dead and has been for months, that drops to about 55%.
Signs You Need a BGA Reball
- Your RTX 4090 shows a black screen but the fans spin and RGB lights up.
- The card boots only when cold, then dies after 10 minutes of gaming.
- You see green or pink artifacts on screen before a crash.
- The card is not detected in BIOS or Device Manager at all.
- The GPU core area gets extremely hot within seconds of power-on (confirmed by FLIR).
RTX 4090 Black Screen and Artifacts: What Actually Fails?
RTX 4090 black screen and artifact faults are most commonly caused by VRAM failure (about 45% of cases), GPU core BGA cracks (30%), VRM phase failure (15%), and PCIe trace damage (10%), based on ComputerKing's 2025 repair log of 612 RTX 4090 cards. The 4090 uses GDDR6X memory that runs hot, and on many AIB models the VRAM thermal pads are too thin or degrade within 18 months. Once a VRAM chip overheats, it can fail short, pulling down the whole memory bus and killing display output.
Here is what I tell customers: if your 4090 shows artifacts for a week and then goes black, you probably lost a VRAM chip. That is actually good news. VRAM replacement is cheaper than a core reball.
| Fault Type | Typical Symptom | Repair Method | Cost (HKD) |
|---|---|---|---|
| VRAM failure | Artifacts, then black screen | Replace faulty VRAM chip | $1,800 - $2,800 |
| GPU core BGA crack | No display, fans spin | BGA reball | $2,500 - $3,800 |
| VRM phase short | No power, blown fuse | Replace MOSFET/driver IC | $1,200 - $2,200 |
| PCIe trace damage | Card not detected | Micro-soldering / trace repair | $1,500 - $2,500 |
| Water damage | Corrosion, multiple faults | Ultrasonic clean + trace repair | $2,000 - $4,500 |
Water Cooling Leak Repair: PCB Trace Fixes That Save Cards
Water cooling leak repair restores a liquid-damaged GPU by ultrasonically cleaning the PCB, neutralizing coolant residue, and micro-soldering broken copper traces and corroded vias. Coolant is not just water — most AIO and custom loop fluids contain glycol, anti-corrosion additives, and sometimes dyes that become conductive and corrosive once they dry. A single drop on a powered RTX 5090 can short a 12V rail and burn through multiple PCB layers in seconds. According to ComputerKing's workshop data, 6 out of 10 liquid-damaged cards can be saved if they arrive within 72 hours and have not been powered on after the leak.
In my experience, the worst thing you can do is dry the card with a hairdryer and try again. That bakes the residue into the PCB. Bring it in wet, or at least do not power it on.
RTX 5090 Repair: Why FLIR and Preheating Matter More Than Ever
The RTX 5090 runs hotter and draws more power than any consumer card before it — up to 575W board power on some models. That changes the repair game. The PCB is denser, the VRM is more complex, and the GPU die is larger. You cannot just hit it with a hot air station and hope. A proper RTX 5090 repair requires a preheater to bring the whole board to 150°C before any top-side heat, or you risk warping the PCB and cracking neighbouring BGA joints.
FLIR is non-negotiable on these cards. With 20+ VRM phases, finding a single shorted MOSFET by touch or smell is impossible. The thermal camera shows it in seconds.
If your RTX 5090 is dead, do not let a general repair shop practice on it. These cards need proper equipment.
How Much Does GPU Repair Cost in Hong Kong?
GPU repair cost in Hong Kong typically ranges from HK$800 for a fan or thermal pad replacement to HK$4,500 for complex water damage or multi-fault BGA repairs, based on ComputerKing's 2026 pricing. Diagnostic fee is usually HK$300, which is waived if you proceed with the repair. Compare that to buying a new RTX 5090 at HK$18,000-22,000, and repair almost always makes sense — unless the PCB is physically cracked or the core is internally shorted.
| Service | Price Range (HKD) | Turnaround |
|---|---|---|
| Diagnostic (FLIR + multimeter) | $300 (waived on repair) | Same day |
| Thermal pad & paste replacement | $800 - $1,500 | 1-2 days |
| Fan / PWM IC replacement | $900 - $1,600 | 1-2 days |
| VRAM chip replacement | $1,800 - $2,800 | 3-5 days |
| BGA reball (GPU core) | $2,500 - $3,800 | 3-5 days |
| Water damage / trace repair | $2,000 - $4,500 | 5-10 days |
| 12VHPWR connector replacement | $1,200 - $2,000 | 2-3 days |
Here is the thing about pricing: anyone quoting you HK$500 for a BGA reball is not doing a real reball. They are reflowing, which lasts a few weeks. Real reballing takes hours and proper equipment.
Frequently Asked Questions
Q: Can a dead RTX 5090 be repaired, or is it gone forever?
A: Most dead RTX 5090 cards can be repaired unless the PCB is cracked or the GPU core has an internal short. FLIR diagnosis identifies the fault, and BGA reballing or VRAM replacement fixes roughly 70-85% of dead cards depending on condition.
Q: How long does GPU repair take in Hong Kong?
A: Simple repairs like thermal pad replacement take 1-2 days. BGA reballing and VRAM replacement take 3-5 days. Water damage repairs can take 5-10 days because of cleaning and trace repair stages. Rush service is sometimes available.
Q: Is it worth repairing an RTX 4090 or should I buy new?
A: Repair is almost always worth it. A HK$2,500-3,800 repair on a card worth HK$12,000-15,000 is far cheaper than replacement. Only consider buying new if the PCB is physically cracked or the core is internally shorted.
Q: Can water-cooling leak damage be fixed?
A: Yes, if the card is not powered on after the leak and arrives within 72 hours. Ultrasonic cleaning plus micro-soldering restores about 60% of liquid-damaged cards. Dried coolant residue is the main killer.
Q: Do you offer GPU repair pickup in Hong Kong?
A: Yes. ComputerKing offers drop-off at our workshop and can arrange pickup for bulk or corporate clients. WhatsApp +852 2186 8010 to arrange.
Conclusion
GPU repair is not magic. It is diagnosis, proper tools, and patience. FLIR thermal imaging finds the fault. BGA reballing fixes cracked cores. Trace repair saves water-damaged boards. The key is getting the card to a technician before secondary damage spreads.
If your RTX 5090, RTX 4090, or any graphics card is showing black screens, artifacts, or water damage, do not keep powering it on. Every boot attempt can make it worse.
WhatsApp ComputerKing at +852 2186 8010 for a free consultation. We will tell you honestly whether it is worth repairing — and if it is not, we will say so.
*This article was written by the ComputerKing senior repair team, with over 15 years of computer repair experience in Hong Kong and 10,000+ cases handled. Last updated: 2026-09-24*