Mindray BeneView T5 Patient Monitor Common Faults & Maintenance Recommendations 

1. Power & Boot Failure

Phenomena

• No power indicator, completely black screen and no response
• AC indicator on, but no reaction after pressing the power button
• Indicator flashes briefly then shuts down immediately with power protection triggered

Common Causes

1. Damaged power adapter, power cord or poor socket contact; blown internal fuse
2. Power board failure: rectifier bridge, filter capacitor, switching tube damage or short circuit
3. Aging, bulging or shorted battery, causing voltage drop and power protection
4. Loose power-on cable, faulty key board or mainboard power supply chip damage
5. Short circuit of external modules triggering over-current protection

Maintenance Suggestions

1. Replace the original AC adapter and power socket to confirm normal AC 220V input.
2. Remove the battery and operate with AC power only; if it boots normally, replace the defective battery.
3. Disassemble the device to inspect the power board; check the fuse, rectifier components and rear-stage DC-DC circuit.
4. Reconnect the power-on and key board cables; replace the key board if there is no trigger signal.
5. Disconnect all external functional modules for startup test to locate short-circuited modules.
6. Replace or repair the mainboard if power supply circuits are abnormal.

2. Display Abnormalities

Phenomena

• Black/white screen with normal system sound and alarm prompt
• Dim backlight, blurred display content
• Screen distortion, vertical lines, flickering or unresponsive touch screen

Common Causes

1. Damaged backlight driver board, aging LED backlight components
2. Loose, oxidized or broken screen flexible flat cable
3. LCD screen physical damage
4. Mainboard display drive circuit failure

Maintenance Suggestions

1. Use a flashlight to check screen content; visible content with no backlight means backlight assembly failure.
2. Reinsert the screen cable, clean gold fingers with anhydrous alcohol and fasten the buckle.
3. Measure backlight voltage; replace the backlight board if power supply is normal with no backlight output.
4. Replace the LCD screen for screen distortion and touch failure; inspect mainboard display circuit if the fault remains.

3. NIBP Blood Pressure Malfunction

Phenomena

• Slow inflation, inflation failure or over-pressure protection alarm
• Automatic measurement failure with no pressure value displayed
• Severe air leakage and inability to maintain pressure

Common Causes

1. Aging cuff, damaged air hose or loose quick connector air leakage
2. Worn air pump with insufficient output pressure
3. Stuck or leaking solenoid valve (pressure maintaining & exhaust valve)
4. Zero drift or damage of pressure sensor
5. Abnormal NIBP module circuit

Maintenance Suggestions

1. Replace the standard cuff and connecting air pipe; inspect air tightness of connectors.
2. Check internal air pipes for aging and cracking; replace aging hoses and fasten interfaces.
3. Test air pump operating sound and inflation efficiency; replace the air pump with weak pressure.
4. Detect solenoid valve actuation; replace faulty exhaust and pressure control valves.
5. Enter engineering mode for NIBP zero calibration; replace the pressure sensor if calibration fails.
6. Repair or replace the NIBP integrated module for persistent measurement failure.

4. ECG Abnormality

Phenomena

• No ECG waveform, continuous lead off alarm
• Severe waveform interference, baseline drift and jitter
• Unstable heart rate detection and inaccurate value