A college student from Tianhe brought us a Lenovo Legion Y7000P (2023 model, i7-13700HX and RTX 4060). His description was textbook: "Ten minutes into Valorant the laptop shuts off. Just before it dies, the fan sounds like a jet taking off, and the keyboard is hot enough to make you pull your hand away." There was no fault LED, and the machine ran normally after every reboot, until the next full load. That is the cooling system tripping the CPU's thermal protection (PROCHOT/THERMTRIP): the die reaches 100°C and the machine cuts power to save itself.
The data said cooling, not silicon
We connected HWiNFO64 for logging and ran AIDA64's FPU stress test for three minutes:
| Metric | Before service | After repair | Normal range |
|---|---|---|---|
| CPU package temperature | 98–100°C (shutdown after 3 minutes) | Steady at 79–83°C | Below 90°C |
| CPU power (PL1 sustained) | Fell from 55W to 28W (throttling) | 55W held throughout | Per model spec |
| GPU temperature | 87°C | 71°C | Below 80°C |
| Fan speed | 5,800 RPM at full tilt, still losing | 4,100 RPM | Varies with load |
| 3DMark Time Spy score | 8,900 (run cut short by throttling) | 11,600 | About 11,500 for this model |
Full fan speed and still losing, with power draw cut in half: the heat was never leaving the chassis. It was trapped inside the cooling module.
Teardown, and three unpleasant findings
The Y7000P is not hard to open: remove 11 screws on the bottom panel (two of them hidden under the rubber feet), run a pry bar along the seam to release the clips, then disconnect the battery lead before touching anything. Three findings stood out:
- A dust blanket. At the exhaust of the fin stack shared by the CPU and GPU, a fully formed gray felt had built up, roughly 3mm thick, blocking 70% of the outlet area. That is why the fan was screaming with almost no airflow.
- Cracked thermal paste. The factory paste had dried into gray-white powder and left clear pump-out marks on the CPU die, thin in the middle and thick at the edges. Three years of gaming had used up its life.
- Collapsed thermal pads. The pads on the power MOSFETs were crushed to paper thickness and split, so heat had almost no path to the cooler.
Cleaning and replacement: the materials matter
- Cleaning. With the module out, work the fins with a soft brush and air, and wipe the fan blades one at a time with a cotton swab. Never blast the fan with high-pressure air: it spins the blades like a generator and can kill the motherboard too. Inside the chassis, use an anti-static brush with a vacuum.
- Thermal paste. Shin-Etsu MX-7921 (about RMB 45 for 2g) on the CPU and GPU dies. It is non-conductive and durable, and it is what we keep in the shop. Liquid metal is a bad idea here: it conducts, it attacks aluminum, and most gaming-laptop cold plates are aluminum. A spill can cost the whole motherboard.
- Thermal pads. Thermalright Odyssey 1.5mm (about RMB 30) on the MOSFETs and VRAM. The thickness must match the factory part. Measure the original with calipers before it collapses, or check the teardown diagram for your model. Too thick, and the cooler no longer presses down on the die, which makes temperatures worse.
- The fan. This one had no bearing noise or play, so it stayed. If you hear a rattle or a click, replace the fan rather than re-oiling it (OEM Y7000P pair, RMB 120–180); a re-oil buys about a month.
Reassembly and sign-off
Reassembly is the teardown in reverse, with three rules: the battery lead goes back last; the cooler screws are tightened diagonally in stages (running one screw all the way down warps the die contact); the bottom-shell clips are pressed shut from one edge across.
Our acceptance tests, all of which must pass:
- AIDA64 FPU stress, 30 minutes: 85°C or below, no throttling, no shutdown.
- FurMark GPU stress, 20 minutes: 80°C or below.
- Dual stress, 10 minutes, the harshest case: no thermal wall.
- Valorant, one hour: stable frame rate and a comfortable keyboard deck.
The total for this machine was RMB 150 for cleaning and repasting when the customer supplies paste and pads, and 1.5 hours start to finish. The student read his burn-in report and said: "It feels like a new laptop."
How often does a laptop need this?
It depends on where the machine lives. In Guangzhou's humid season and dusty air, a gaming or high-performance laptop should be serviced every 18–24 months. A low-power thin-and-light can go two to three years. Pets in the house, or a laptop that lives on a bed, shortens the interval to 12 months. The signals: the fan clearly faster in the same workload, a hotter chassis, and performance that drops for no reason as the chip throttles. Two out of three, and it is time to book the service.
ACCPC charges RMB 120–200 for laptop cleaning and paste, priced by teardown difficulty: RMB 120 for an ordinary thin-and-light, RMB 150 for a gaming laptop, RMB 200 and up for high-end chassis and liquid-metal models. Every job ends with a full burn-in and a before-and-after temperature report. We cover Panyu on site; other districts can ship the machine to us by SF Express, freight collect.