GPU Reball & BGA Reflow

What BGA reflow actually is

The GPU on a modern graphics card is mounted to the board using ball grid array packaging: hundreds of small solder balls under the chip, soldered to corresponding pads on the PCB. Under sustained thermal stress, those solder balls can develop micro-cracks. The card starts showing intermittent symptoms, random freezes, post failures, artifacting that comes and goes, shutdowns under load.

BGA reflow is a controlled re-melting of those solder joints under specific temperature staging. Done correctly, the cracked joints reform and the card returns to a working state. Done incorrectly, the same process can damage the GPU, warp the board, or produce a repair that fails again in weeks.

Why temperature control matters

The difference between a reflow that lasts and one that doesn't is almost entirely in the temperature profile. Solder melting point and the surrounding components all have specific thermal tolerances. The profile we use takes the board through several stages:

• Preheat, bringing the whole board up to a moderate temperature so the GPU isn't shocked by sudden heat.
• Ramp, raising temperature at a controlled rate toward the soak zone.
• Soak, holding at a temperature below melt to normalize and prepare for reflow.
• Reflow peak, bringing the solder above its melt point for a controlled time, just long enough to reform the joints.
• Cooldown, controlled ramp back down to room temperature so the new joints solidify properly without stress.

A heat gun aimed at the chip skips all of these stages. That's how repairs fail.

When a reball is the answer instead

Reflow works when the original solder joints can be coaxed back into a good state. There are cases where they can't: joints that have already been reflowed once and failed again, joints that have been contaminated, or cracks too severe for reflow to close. In those cases the GPU itself comes off the board, the old solder gets cleaned off both the chip and the PCB pads, a fresh array of solder balls is applied, and the GPU is reseated.

This is more involved, takes longer, and costs more. It also works in cases where reflow no longer does. The diagnosis determines which approach is appropriate.

The honest part

BGA reflow and reball both have a reputation problem in the repair world, mostly because they were widely abused in the early 2010s as a "fix everything" service. Cards came back working for a few weeks and then failed again, because the reflow was done with a heat gun and no actual technique.

We try to be honest about both what these techniques can do and what they can't. They work when the fault is cracked BGA joints, applied with proper temperature control. They don't work when the fault is something else, like dead VRAM, blown power-stage components, or dead GPU silicon. Diagnosis exists to make sure we only apply BGA work where it's actually the right answer. If your card's problem looks more like VRAM failure, see our GPU artifacting and VRAM repair page. If it won't post at all, see GPU no display repair.