Two Cases of Troubleshooting and Repairing the Mindray Resona 7 Color Ultrasound Diagnostic Instrument

Machine Type: Mindray Color Doppler Ultrasound Diagnostic Instrument

Machine Model: Resona 7

I. Malfunction 1

1. Malfunction Phenomenon

After pressing the power button, the medical display screen shows no image, but the power indicator light is on normally, indicating that no image signal is received from the host. The LCD screen on the control panel displays normally, and the images of the examination interface can be displayed normally on the workstation connected to the Resona 7 ultrasound machine.

2. Malfunction Analysis and Troubleshooting

Based on the malfunction phenomenon, it is judged that:

(1) There may be a malfunction in the medical display.

(2) The video cable connecting the internal host of the ultrasound machine to the medical display may be malfunctioning.

(3) There may be a malfunction in the display signal transmission from the internal host of the ultrasound machine to the medical display.

There are a total of 3 possibilities, all of which can cause the medical display to fail to display images.

Open the back cover of the medical display and the back panel of the Resona 7 ultrasound machine. First, test the video cable connecting the ultrasound host and the medical display. There are no signs of breakage, and there is no situation where multiple video cable pins are connected to the shell. After replacing the video cable with a new one, the medical display still cannot display images. It can be basically ruled out that the malfunction is caused by damage to the video cable.

Then, considering that the workstation and the display screen on the control panel can display images normally, based on the internal structure and working principle of the Resona 7, it is concluded that the possibility of a problem with the display signal transmitted from the internal host to the medical display is unlikely. After confirming that the video transmission cable is working normally, the video cable connected to the medical display is connected to an ordinary display, and the image can be displayed normally. After confirming that the power voltage of the medical display is normal, it is concluded that the medical display cannot display images due to an internal malfunction.

After disassembling and inspecting the display, it was found that the internal power supply module board and backlight voltage board were working normally, but the display board was malfunctioning, causing the medical display to fail to display images. After replacing the display board, the medical display can display images normally, and the malfunction is resolved.

II. Malfunction 2

1. Malfunction Phenomenon

Resona 7 The boot speed becomes abnormally slow, and the display interface repeatedly shows the progress bar getting stuck during the boot process. In case of complete freezing, even after a forced shutdown and restart, the freezing situation still occurs frequently.Even if the boot progress bar is finally completed successfully,the entire boot time is longer than usual by5~ 10 minutes. 。After entering the examination interface for about 5 minutes`the entire machine will be almost completely stuck, mainly manifested as the inability to operate the machine, slow response of the control panel buttons, disappearance of the echo area on the display screen, and then displaying FPGA temperature alarm, and the machine automatically shuts down.

2. Malfunction Analysis and Troubleshooting

Since the machine has experienced an FPGA alarm, it is considered that the FPGA may have an overtemperature condition. In maintenance practice, this is often due to the dust net not being cleaned regularly, resulting in excessive dust accumulation and poor heat dissipation, which leads to high internal temperature. However, considering that each ultrasound machine undergoes dust removal once every quarter, and considering the sanitary conditions of the work site, this possibility is considered to be relatively small. The dust net was removed and inspected on site, and it was found to be clean and intact, ruling out the possibility of temperature alarm caused by dust.

The Resona 7 work log was copied and sent to the manufacturer's after-sales engineer for analysis of the background fault process. At the same time, the self-check function was entered in the Resona 7 internal system. During the self-check process, the following error occurred: TRC memory stick test failed, prompting to check the TRC board; PC template and DSP FPGA communication self-check failed, prompting to check the engine board. After multiple restarts, the self-check system showed different error messages, making it impossible to provide a clear fault direction and repair ideas immediately.

During multiple restarts and system self-checks, the error messages from the self-check system were photographed and recorded. After consulting relevant repair materials, it was learned that this type of malfunction frequently occurs in the TR board and engine board of the Resona 7, and the number of times the self-check system reported errors in these two boards was almost twice as many as other errors. Considering that there are multiple TR boards inside the Resona 7, the probability of a malfunction is relatively high, so we started with checking the TR board malfunction. The Resona 7 shell was opened, and the TR boards at positions A, B, and C were removed one by one. After multiple restarts and confirmations, it was found that the malfunction had not been eliminated. Based on the internal structure and working principle of the Resona 7, and the FPGA alarm information provided by the analysis log, only the last engine board remained. After replacing the engine board and restoring everything, the machine was restarted, and the malfunction disappeared, and the machine resumed normal operation.

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