01–03Review & prepareRelease inputs together
01DFM & file reviewGerber, drawings and stack-up
02BOM & sourcing reviewParts, alternates and lead times
03IQC & material controlIncoming verification and storage
Full turnkey PCB assembly process
From approved files to shipment—19 controlled checkpoints.
KeepBest connects component procurement, SMT, DIP/THT, inspection, functional testing and finished-product assembly in one coordinated process across China and Thailand.
One connected production route
01
Engineering & materialsFiles, BOM, DFM and incoming control
02
SMT front endClean, print and inspect solder paste
03
Placement & solderingPlace, reflow and optical inspection
04
THT & finishingInsert, solder, clean and protect
05
19 checkpoints · route selected to your product requirementsTest & releaseElectrical test, final QA and packing
Before productionDFM + BOM reviewResolve manufacturability and sourcing risks early
In productionSMT + THT controlOne route for mixed-technology assemblies
InspectionSPI · AOI · X-rayFeedback at critical manufacturing checkpoints
ReleaseICT · FCT · OQCTest coverage matched to the approved plan
One coordinated teamEngineering, supply chain, manufacturing, inspection and test work from the same approved project inputs.
What we offer
Full turnkey PCB assembly services.
Keep Best PCB Assembly Co., Ltd integrates component procurement, PCB manufacturing, SMT, DIP/THT, finished-product assembly and testing. This keeps purchasing, engineering and quality decisions connected instead of splitting responsibility between unrelated suppliers.
The process begins before the first board reaches the line. Files, components, inspection criteria and test requirements are reviewed together so the production route is clear before material release.
PCB design supportDFMA engineering reviewPCB manufacturingComponents purchasingSMT & DIP assemblyInspection & assembly test
View all services19 controlled checkpoints
Click a checkpoint to inspect the control behind it.
Five clear phases keep engineering, materials, production and quality aligned. Select any checkpoint below to see its production input, primary control and intended output.
01
Selected checkpoint
DFM & file review
Engineering reviews the released Gerber data, drawings, stack-up and assembly notes before the production package is created.
04–06SMT front endControl paste before placement
04PCB load & cleanControlled line entry
05Solder paste printingStencil alignment and deposition
063D SPIVolume, height and offset checks
07–10SMT main linePlace, solder and inspect
07Component placementProgrammed package placement
08Reflow solderingProfile-controlled thermal cycle
09First article reviewSetup confirmation
10AOI inspectionOptical process feedback
11–14THT & finishingProduct-specific route
11THT / DIP insertionManual or supported insertion
12Through-hole solderingWave or selective as approved
13Clean & depanelProcess selected to requirements
14Conformal coatingApplied when specified
15–19Test & releaseVerify before shipment
15X-ray inspectionHidden joints as required
16ICT / FCT / programmingElectrical and functional checks
17Final QA & OQCRelease verification
18Label & traceabilityIdentification and records
19ESD pack & shipProtected delivery
From engineering through finished product
Three workstreams keep the process connected.
The original page presented KeepBest as a full-turnkey partner. These workstreams show what that means in practice and what each team hands to the next stage.
01 / Engineering & supply chain
Turn customer files into a controlled production package.
Design data, BOM, approved alternates, component status and inspection requirements are coordinated before release. This helps purchasing and production work from the same assumptions.
Gerber and drawing reviewDFMA risk feedbackBOM and alternate reviewMaterial status and IQC plan
02 / PCB assembly
Run SMT and THT as one coordinated manufacturing route.
Paste printing, SPI, placement, reflow and AOI form the SMT core. Through-hole insertion, selective or wave soldering, cleaning and coating are added according to the assembly design.
SMT setup and first articleProfile-controlled reflowMixed-technology assemblyIn-process inspection feedback
03 / Test & finished product
Verify the board, complete final assembly and release it with records.
X-ray, ICT, FCT, programming, burn-in, final QA, labeling and box build are selected from the approved product plan. Packaging protects the released product through delivery.
Product-specific test coverageProgramming and traceabilityBox build where requiredOQC and ESD packaging
A route built for the product
Not every PCBA should follow the same path.
We select the assembly and inspection route from component technology, board density, reliability requirements, production volume and end-use environment. That keeps the process complete without adding unnecessary steps.
Your quotation should identify the planned assembly, inspection and test route—not only a unit price.
China and Thailand support
One project standard across three locations.
The original page highlights KeepBest's Shenzhen, Jiangmen and Thailand presence. In the redesigned structure, each location has a clear role while project requirements, communication and quality expectations stay connected.
Explore our factoryShenzhenHeadquarters, customer coordination, engineering communication and supply-chain support.
JiangmenSmart manufacturing, SMT, DIP/THT, inspection and testing support.
ThailandRegional manufacturing support for international sourcing and delivery requirements.
Closed-loop quality control
Find issues where they can still be corrected efficiently.
Inspection is positioned throughout production so results can guide the next process decision.
01
InspectSPI, first article, AOI, X-ray and electrical tests collect evidence.
02
ReviewEngineering and production compare results with the approved criteria.
03
CorrectSetup, material, profile or workmanship adjustments are controlled.
04
Verify & recordThe affected checkpoint is re-verified and records support traceability.
Full turnkey PCB assembly services
One process, connected to the service you need.
These links preserve the original page's service structure and help buyers continue to the relevant technical capability.
01 / ENGINEERINGPCB Design ServiceDesign support for product and manufacturing requirements.Explore design →02 / PREPARATIONPCB DFMA ServiceManufacturability review before production release.Explore DFMA →03 / FABRICATIONPCB ManufacturingBare-board production with controlled quality requirements.Explore fabrication →04 / ASSEMBLYPCB Assembly ServiceSMT, THT and mixed-technology PCBA manufacturing.Explore assembly →05 / SUPPLY CHAINComponents PurchasingComponent sourcing aligned with BOM and production planning.Explore sourcing →06 / QUALITYAssembly TestInspection and test options matched to product requirements.Explore testing →
Process FAQ
Questions buyers ask before production.
Clear inputs help us choose the correct production and inspection route.
What files do you need to review a PCB assembly process?
Gerber files, BOM, assembly drawings, target quantity and any programming, coating, inspection or functional-test requirements provide the best starting point.
Do all projects use all 19 checkpoints?
No. The 19-checkpoint map shows the complete controlled route. Product-specific steps such as THT soldering, X-ray, conformal coating, ICT or burn-in are activated when required.
Can you support prototype and low-volume PCBA?
Yes. The same engineering and quality logic applies, while the production route is adjusted for the quantity, product maturity and component availability.
How are process issues traced?
Material identification, production records, inspection results and test data are linked according to the traceability requirements agreed for the project.
Can assembly, sourcing and testing be quoted together?
Yes. KeepBest's turnkey scope can combine PCB manufacturing, component purchasing, assembly, inspection, test and finished-product operations.
Start a project conversation
Tell our engineering team what you need
Share the essentials now. We will review your requirements and follow up with the right technical questions, lead-time options and quotation path.
Engineering response targeted within 24 hoursPrototype, low-volume and production programsMutual NDA available for confidential projects
Prefer email?sales@keepbestpcba.com
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