GPU Repair Hong Kong: FLIR Thermal Imaging & BGA Reball Guide
Introduction
Your RTX 5090 suddenly black screens mid-game. You smell something faint. You panic. Honestly, I get this call three or four times a week at our Hong Kong workshop, and the first thing I tell people is: don't bake it, don't shake it, and definitely don't trust the guy in Sham Shui Po who says he can "reflow" it for HK$300.
GPU repair in Hong Kong has changed a lot since the RTX 30-series days. Cards are denser, VRAM runs hotter, and the 12VHPWR connector has introduced a whole new failure mode. What hasn't changed is that most failures are diagnosable — if you have the right tools. In this guide, I'll walk you through how FLIR thermal imaging and BGA reballing actually work in a real repair bench, based on the cases our team handles every week.
What Is FLIR Thermal Imaging and Why Does It Matter for GPU Repair?
FLIR thermal imaging is a diagnostic method that uses an infrared camera to visualise heat distribution across a GPU's PCB, allowing technicians to pinpoint shorted VRAM modules, failed MOSFETs, or cold solder joints within minutes. In our Hong Kong workshop, we've found that FLIR reduces GPU diagnostic time by roughly 60% compared to traditional multimeter probing alone — a big deal when a customer is standing at the counter waiting for an answer.
Here's the thing: a graphics card has hundreds of components, and when it won't POST, the fault could be anywhere. Blindly probing with a multimeter takes hours. A thermal camera shows you the problem in seconds — a VRAM chip glowing 40°C hotter than its neighbours is almost always shorted.
How Does FLIR Thermal Imaging Actually Work on a Dead GPU?
The process starts by powering the card on a current-limited bench supply — never a normal PSU, because a shorted rail can pull 30A and torch the PCB. We set the current limit to around 3A, then watch the thermal camera. Within 5-15 seconds, the faulty component lights up. From there, we know exactly which VRAM module, MOSFET, or capacitor to remove.
According to ComputerKing internal statistics, over 70% of RTX 40-series and 50-series cards that arrive with "no display" symptoms have a single shorted VRAM module — not a dead GPU core. This matters because VRAM replacement is a HK$1,200-2,500 job, while a dead core usually means a full BGA reball or a write-off.
What Is BGA Reballing and When Does Your GPU Need It?
BGA reballing is the process of removing a ball-grid-array chip — usually the GPU core or a VRAM module — cleaning the old solder balls, and reattaching it with fresh solder spheres under controlled heat. It's needed when the chip has cold joints, cracked solder balls from thermal cycling, or has been damaged by liquid ingress or a previous bad repair attempt. In Hong Kong's humid climate, we see roughly 3-4 BGA reball jobs a week, most on cards that have been running 24/7 for crypto or AI workloads.
A proper BGA reball requires a preheater, a hot air rework station with a bottom heater, and a stencil matched to the chip's ball pitch. On an RTX 5090, the GPU core has over 5,000 solder balls at a 0.4mm pitch — one slip and you've bridged two power rails. That's why we reject about 1 in 5 cards that come in after a DIY reflow attempt. Once you've warped the PCB or lifted a pad, the repair cost triples.
Water Cooling Leaks: Why Hong Kong's Humidity Makes It Worse
Water cooling leaks are the second-most-common cause of GPU death we see in Hong Kong, right after VRAM failure. Our humidity sits between 70-90% for most of the year, which accelerates corrosion on any exposed copper trace. A tiny drip from a fitting that would dry out in a dry climate will instead sit on the PCB, eat through a trace, and short a power rail — often weeks after the leak happened.
FLIR is brilliant here too. After cleaning the board with isopropyl alcohol and ultrasonic, we power it up and watch for hot spots along the damaged trace. If the PCB trace is broken, we run a jumper wire (飛線) from the damaged pad to the nearest healthy via. We've repaired everything from a single broken 12V sense line to a full PCIe power plane rebuild this way. Typical cost: HK$1,500-3,500 depending on trace count.
RTX 5090 Specific Issues: What We're Seeing in 2026
The RTX 5090 has been on the bench a lot this year. Three issues stand out. First, the 12VHPWR connector still melts under uneven load — we've documented 40+ cases in Hong Kong since launch. Second, VRAM modules on the 5090 run notably hotter than the 4090, and we've seen more early-life failures. Third, the denser PCB makes BGA work harder; a 5090 core reball takes me about 4 hours versus 2.5 hours for a 4090.
A quick comparison of what we typically see:
| Fault | Typical Symptom | Diagnostic Tool | Repair Cost (HKD) |
|---|---|---|---|
| Shorted VRAM | Artifacts, black screen | FLIR | 1,200-2,500 |
| Cracked BGA joints | No POST, intermittent | X-ray / reball | 2,500-4,500 |
| 12VHPWR melt | Burn smell, no power | Visual + FLIR | 800-2,000 |
| Water damage | Corrosion, short | FLIR + microscope | 1,500-3,500 |
| Dead GPU core | No display, no fan | FLIR + bench | 3,500-6,000 |
Can You DIY GPU Repair in Hong Kong?
Honestly? For 90% of cases, no. A FLIR camera alone costs HK$8,000-25,000, a BGA rework station with bottom heater runs HK$15,000+, and the skill to reball a 0.4mm pitch chip takes years to develop. The DIY route that actually works is limited to thermal paste and pad replacement — and even that goes wrong often enough that we see 2-3 "I tried to repaste it myself" cards a week.
If your card is under warranty, go to the manufacturer first. If it's out of warranty, get a proper diagnostic before you spend money. We offer free FLIR diagnostics at our Hong Kong workshop — bring the card in, we'll tell you in 20 minutes whether it's worth fixing.
Frequently Asked Questions
Q: How much does GPU repair cost in Hong Kong?
A: Most repairs range from HK$800 for a 12VHPWR connector replacement to HK$6,000 for a full GPU core reball. VRAM replacement typically sits at HK$1,200-2,500. Always get a diagnostic quote first.
Q: Can FLIR thermal imaging find any GPU fault?
A: No. FLIR excels at finding shorts and hot spots, but it can't detect cracked BGA joints under the chip or intermittent faults. Those need X-ray or a bench test under load.
Q: Is BGA reballing permanent?
A: A properly done reball with quality solder and correct thermal profile typically lasts 3-5+ years under normal use. Cheap reflows done without a proper bottom heater often fail within months.
Q: My GPU got wet from a water cooling leak — is it dead?
A: Not necessarily. If you power it off immediately and bring it in within a few days, we can often clean and repair the PCB. If it's been powered on while wet, damage is usually worse but still sometimes fixable.
Q: Do you repair RTX 5090 cards in Hong Kong?
A: Yes. We handle RTX 5090 12VHPWR melts, VRAM failures, BGA reballs, and water damage. WhatsApp us at +852 2186 8010 with photos of the card and we'll give you a preliminary estimate.
Conclusion
GPU repair isn't magic — it's diagnostics, tools, and experience. FLIR thermal imaging tells you where the fault is. BGA reballing fixes the faults that live under the chip. And in Hong Kong's humid climate, catching water damage early is the difference between a HK$1,500 repair and a HK$6,000 rebuild.
If your graphics card is misbehaving — black screens, artifacts, fans not spinning, burn smells — don't guess. Bring it in for a proper FLIR diagnostic. Our team has handled over 10,000 Hong Kong computer repair cases, and we'll tell you honestly whether your card is worth fixing or whether it's time to let it go.
WhatsApp us at +852 2186 8010 to book a diagnostic, or drop by our workshop. We'll put your GPU on the bench, fire up the thermal camera, and give you a straight answer.
*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: 2026-09-28*