Consumer AI / AI Voice Recorder / Prototype PCBA + SMT + Testing
Portable AI projector startup goes from 72-hour prototype boards to mass production in Shenzhen
Consumer AI / Portable AI Projector / Prototype PCBA + SMT + Testing
Castorbeam Labs needed optical-engine and main boards for a battery-powered AI projector that could prove thermal, luminance and fan acoustic limits q...
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Key results
- 2 revsBoard Revisions EVT to DVT
- Inside limitOptical Uniformity
- Target metPVT First-Pass Yield
- Low thousandsFirst Production Batch
The challenge
Castorbeam Labs needed optical-engine and main boards for a battery-powered AI projector that could prove thermal, luminance and fan acoustic limits quickly, then carry per-serial optical and thermal test records from EVT through mass production in Shenzhen without losing BOM control.
Our solution
Illuminious ran 72-hour prototype boards via the portal, a DFM review that fixed thermal keep-outs, fan path, pogo-pin access and storage second-source, then EVT/DVT/PVT PCBA in the Shenzhen factory with optical and thermal fixtures, golden-sample sign-off and ICT/FCT results per serial through the first low-thousands production batch.
The challenge: Castorbeam Labs, a small U.S. seed-stage consumer AI team, had a pocket projector that threw a clean image on a bench and a roadmap that needed real boards, not another round of hand-patched samples. Company name and individuals have been anonymized for confidentiality. The product pairs a compact optical engine on a daughter board with a main SoC board carrying Wi-Fi and BLE, a time-of-flight sensor for keystone correction, a Li-ion pack, one small axial fan and a molded shell. Every part of that stack fights for the same few cubic centimeters of heat budget.
A portable AI projector is a thermal and optical problem wearing a PCBA costume. Light output falls as the engine heats, the fan adds noise exactly when the user is trying to watch something, and the battery sits close to both. The team needed to learn which of those limits would bite first, while the design was still cheap to change.
Memory pricing added pressure on the BOM. TrendForce reported on September 30, 2026 that conventional DRAM contract prices were projected to rise 10% to 15% quarter over quarter in Q4 2026, with overall NAND flash up 15% to 20%. For a projector running on-device AI features, that made a second qualified storage and power-management option a sensible line item, though it stayed a secondary beat next to the optical work.
The solution
Castorbeam sent schematic, layout, BOM, firmware build and shell CAD. We signed the client's NDA before the first call. A US-based project manager owned the stage path, and Illuminious engineers attended the EVT, DVT and PVT builds in person at our ISO 9001 Shenzhen factory. The plan was written as gates:
- 72-hour prototype boards via the portal: Configurable rapid prototyping and prototype PCB assembly so the team could test boot, Wi-Fi, battery life and a bench luminance check on real boards.
- DFM review before EVT quantity: Thermal vias and keep-outs around the optical engine, the fan acoustic path, test-pad access for a pogo-pin fixture and fuel-gauge routing were flagged and fixed on paper.
- Optical-engine and main-board SMT: Builds on our 8 automated SMT lines capable of 01005, with AOI on every assembled board and X-ray on BGA and QFN packages under IPC-A-610 Class 2 and Class 3 workmanship.
- Optical, thermal and acoustic fixtures: Luminance and uniformity checks against a matte target, a thermal camera pass on the engine, and an early acoustic check on the fan path, each with a written limit.
- Golden sample and per-serial records: A signed record listing design revision, BOM, firmware release and measured optical and thermal values, then production test firmware writing results against every serial number.
Results
The outcomes below are rounded and relative. They show what a disciplined quick turn PCBA prototype path and a hardware prototype partner for startup teams can protect when the product is a battery-powered projector.
2 board revs
Closed EVT to DVT
Thermal keep-outs and test-pad access drove two layout revisions before the design freeze at DVT.
Inside limit
Optical uniformity
After one thermal pad change, uniformity across the projected field held inside the limit both parties signed at DVT.
Target met
PVT first-pass yield
First-pass yield on the pilot run reached the target written into the PVT gate.
Low thousands
First production batch
The first mass-production batch left the Shenzhen factory for the client's own logistics provider.
From 72-hour prototype boards to mass production
1. Prototype: 72-hour boards via portal
Decision: order the first main and optical-engine boards as a 72-hour prototype build so the team could measure real behavior early. Gate: boards built against the portal configuration, with a short bring-up script covering boot, Wi-Fi, BLE, fuel gauge readout and a bench luminance reading. What changed: the team learned the engine drifted dim after a few minutes of runtime, which put thermal design at the top of the DFM list.
2. DFM: thermal path, acoustics, test access and second source
Decision: run a DFM review before committing EVT quantity. Gate: a written DFM and BOM report with changed files. What changed: thermal vias and copper keep-outs were added under the optical-engine connector area, the fan inlet and outlet were kept clear of the battery cavity, pogo-pin test pads were moved for fixture access, and the fuel-gauge sense routing was shortened. The BOM review added a second-source storage and PMIC option, a topic covered in our consigned versus kitted PCBA guide and handled through component sourcing.
3. EVT: small PCBA lot and firmware bring-up
Decision: build a small PCBA lot with SMT assembly in our Shenzhen factory and bring up firmware on the line, following the path in our firmware bring-up guide and firmware engineering practice. Gate: boot, Wi-Fi and BLE join, ToF keystone readout, a thermal camera pass on the optical engine and an early acoustic check on the fan. What changed: a hot spot beside the engine driver led to a thermal pad change and a fan curve adjustment, with a short aluminum bracket as a heatsink aside from CNC machining.
4. DVT: frozen design, numeric limits and golden sample
Decision: freeze schematic, layout and BOM after the second board revision. Gate: luminance, uniformity, keystone and RF functional tests with numeric limits, using the nine-point light-output method that ANSI IT7.228 and ISO 21118 both build on, plus EMC and RF pre-scans ahead of the client's own certification path. What changed: the signed golden sample record listed design revision, BOM, firmware release and measured optical and thermal values. Only then did the team release a soft tool for the shell, since DVT had closed the geometry. See injection molding for how tooling follows that sign-off.
5. Pilot PVT: real line, ICT and FCT per serial
Decision: move the frozen design onto a real production line with production test firmware. Gate: ICT and FCT across more than 30 stations available in the factory, optical and thermal readings stored per serial number, and OTA verify and fallback checks on a sample of units, all under testing and inspection. What changed: a fixture seating step and a luminance warm-up timer were fixed on the line, which closed the yield gap without another board spin.
6. Mass production in Shenzhen
Decision: run production batches against the golden sample in the same ISO 9001 Shenzhen factory that built EVT and DVT. Gate: each batch compared with the golden sample, debug ports locked, and optical and thermal records kept per serial. What changed: the first production batch, in the low thousands, left the Shenzhen factory for the client's own logistics provider.
"We expected the optics to be the risk. The review that moved our test pads and forced a thermal path under the engine is what kept the line honest when we scaled."
"Seeing luminance and temperature tied to each serial at PVT, against the same limits we signed at DVT, made mass production feel like a continuation instead of a restart."
What AI projector PCBA and portable projector manufacturing require
AI projector PCBA is a stack of small decisions that all touch heat. A quick turn PCBA prototype only pays off if the same limits survive from the first board to the thousandth, which is why Castorbeam treated the DVT numbers as the rule for every later batch. Our NPI engineering guide describes the same discipline for any hardware product. For portable projector manufacturing, the shell is a supporting actor: it follows the electronics, and soft tooling waits until DVT closes the geometry.
Founders evaluating a similar path can read how we work with early hardware teams on the startups page. The Shenzhen Founder Tour, December 6 to 11, 2026, is a Future Factory program. Illuminious hosts the factory stop and handles applications and payments, and founders can apply here.
Key success factors
- Measure heat on the first boards: 72-hour prototype builds replaced opinion with luminance and temperature data.
- DFM before DVT quantity: thermal keep-outs, fan path and pogo-pin access cost far less on paper than on a frozen BOM.
- One golden sample, many serials: optical and thermal limits signed at DVT became the batch comparison rule in mass production.
- Line fixes stay on the line: PVT fixture and warm-up changes closed yield gaps without another board spin.
Ready for projector boards that survive production
Illuminious is a U.S. NPI engineering company. Engineered in San Francisco. Prototype builds, DFM and mass production in our own factory in Shenzhen. Send your schematic, BOM and shell CAD, and our engineers will walk through DFM, EVT, DVT and PVT with you. Instant price for configurable services · Free engineering review in 1–2 business days · Official quote within 24 hours.
"We expected the optics to be the risk. The review that moved our test pads and forced a thermal path under the engine is what kept the line honest when we scaled."
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