In this episode Shahriar investigates a peculiar problem with an Agilent P-Series Power Meter. While the instruments works during startup, after about 10 minutes the LCD screen begins to flicker and become scrambled. Initial investigation reveals that the issue is not likely with the main motherboard since USB connection to the instrument and data-readout is possible even when the LCD screen is malfunctioning.
Teardown of the unit reveals a modular design where a ribbon cable connects the front panel to the motherboard. Moving the cable around affect the LCD which points to a faulty cable connection. The failure is at the only ribbon cable without a proper removable connector to the motherboard. The cable is cut, re-crimped and the solder joints re-worked. This appears to solve the LCD problem. The performance of the unit is verified by measuring the output power of the Tektronix TSG Vector Signal Generator.
The Signal Path
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