The yellow wire(jumper wire) solution is part of functional quality improvement purpose before integrating the circuit into new PCB.
在将芯片整合到新的PCB板之前，采用黄线（飞线）解决方案的目的是提高功能模块质量。
At first, regarding the product quality, we have completed adequate process/product qualification for both "with this yellow wire" and "w/o yellow wire".The qualification is not only system level but also PCBA level testing which includes all sets of reliability testing( ATC( Thermal Cycle)/THB( Thermal Humidity & Bias)/HT(High Temp Storage Test)/Mechanical Shock/Vibration testing ,, etc). Thus ,we have no quality/reliability concern on this product even with "yellow wire solution". And there is no differences from functional/quality point of view.
In terms of process control , we have followed IPC 610 standard with tight process control for quality of product.We build the PCBA by using only our qualified MFG line with adequate process/operator workmanship control , and the process fully validates industry standard.
As I stated in the above, the yellow wire is for fix the problem w/o any reliability risk and for product quality improvement purpose in new product phase. Wiring method has formal rule( tight control) inside IBM(lenovo), it can be applied only for non critical circuit,, such as reset , pull-up. Jumper,, etc,,and NOT for critical signals which requires impedance/Dk control.. Thus, No quality problem,No reliability concern on this wire itself. This means no differences between "integrated PCB" and "PCB with yellow wire" ,, from functional/quality view point.
I would like to say some history of ThinkPad PCBA for your reference ,, This yellow wire method has been used from the begining of IBM PC/Thinkpad product more than 18 years.. No difference for 18 years while I have been working for "ThinkPad PCB/PCBA design and quality"..and now it has already been in the industry standard.
发表于 2007-3-22 15:58
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