Hi TI experts.
Based on iwr6843isk-ods EVM, I have designed our own millimeter wave sensing products. The relevant parts of 6843 are completely consistent with EVM. A total of 20pcs have been produced, and one of them is not working properly. The phenomenon is described below.
1. The CFG serial port can be connected to the computer, but the data serial port shows no connection. So we can't received any valid data from DATA serial port.
2. Measuring the power supply on the board, it is found that the B13(VOUT_14SYNTH, Internal LDO output) pin has no 1.35v voltage output, but the normal board has 1.35v output at this pin. The voltage of other points is consistent with the normal board. What are the working conditions of this internal LDO?
Our boards are inspected by 3D X-ray when they leave the factory, which can completely eliminate the soldering problems.
Can you provide some analysis and detection ideas for us to double check? We are afraid of similar problems in mass generation section.
Best regards