CRT monitors can cause serious injury or death, even when unplugged for days, weeks, or months. Read and follow all precautions before opening any CRT device.
LETHAL HIGH VOLTAGE
The anode (high-voltage) circuit can hold 20,000-30,000+ volts on the tube's second anode, the suction-cup connector on the glass.
Capacitors, including the tube itself, can retain a dangerous charge long after power is removed.
Flyback transformers and the associated circuitry can also deliver painful or dangerous shocks.
IMPLOSION HAZARD
The glass envelope is under vacuum and can implode violently if cracked, scratched, or struck.
Flying glass can cause severe lacerations and eye injuries.
Never carry a tube by its neck. Never apply pressure to the neck or the neck board.
Wear safety glasses or a face shield at all times.
BEFORE YOU BEGIN
Unplug the device from mains power.
Work only if you are trained or experienced with high-voltage electronics. If you are not, do not open the case.
Never work alone. Have someone nearby who can call for help and knows CPR.
Keep one hand in your pocket or behind your back when probing live circuits, to avoid a path across your chest and heart.
Remove jewelry and metal accessories.
Work on a dry, non-conductive surface. Keep liquids away from the work area.
DISCHARGING
Discharge the anode only with a properly insulated, high-voltage discharge tool and a known-good ground connection, following the correct procedure for your specific device.
Never use a bare screwdriver or improvised tool. This can damage components and injure you.
Do not assume the tube is discharged. Verify with an appropriate high-voltage probe.
Recharging can occur after discharge (dielectric absorption), so re-check before touching.
POWER SUPPLY
Additional hazards exist inside the case of the switching power supply. For example, the rectified line voltage is sufficiently dangerous that it may cause burns, electrocution, and death.
Everything on the internet should be suspect... if you follow troubleshooting advice, it is at your own risk.