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Troubleshooting intermittent yellow discoloration of the Hitachi EUB6500 color ultrasound display
Release time:
2025-03-12 09:36
Device Model
Hitachi EUB6500 Ultrasound
Fault Phenomenon
The ultrasound intermittently displays a sudden yellowing of the monitor's background color, which recovers after a few seconds.
Fault Analysis and Troubleshooting
First, we entered the maintenance mode and performed a self-check on the Hitachi EUB6500 ultrasound. The results showed everything was normal. Due to the intermittent nature of the fault, we could only observe it by keeping the machine running for a long time. Within an hour, we observed two occurrences of the abnormality.
At the same time that the fault occurred, we noticed that the image on the workstation connected to the ultrasound did not show any abnormal reaction. This led us to initially judge that the main unit was normal, and that the problem may lie in the monitor.
In addition, after turning off the Hitachi EUB6500 ultrasound (without disconnecting the power switch at the bottom of the machine), the “no input” message appeared on the monitor. This led us to speculate that the design of this machine may be similar to that of a computer, with the monitor and host having separate power supplies.
After opening the back cover of the monitor, we saw a cable from the main unit that included a DC12V power output, a VGA port, and a data cable interface, etc.
We used a 12V DC power adapter to supply power to the monitor and connected it to a computer host using a VGA video cable, using it as a substitute for a normal LCD monitor.
After running it for two hours, no abnormalities were observed. Therefore, we can basically determine that the problem lies in the VGA video cable or the interfaces at both ends.
After measurement with a multimeter, it was found that one end of the video cable had poor contact due to bending. We consulted the manufacturer, who quoted tens of thousands of dollars for the entire cable assembly. However, by observation, we determined that the video cable connecting the ultrasound host and monitor was independent, so we replaced it with a three-meter-long VGA video cable, and the fault was eliminated.
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