CRT Safety Procedures
The CRT is one of the most dangerous pieces of equipment you'll repair. A charged CRT carries high voltage—about 27,000 volts in a color unit—so you could electrocute yourself unless you handle the display using the appropriate safety procedures. In addition, the vacuum tube in a CRT can implode if broken or punctured. But handled properly, neither you nor the display will come to any harm.
Happily, there are very few occasions and needs for which you should ever have to open a display and expose a CRT. Between the changing and improving technology and the lowering of prices, attempting to fix a CRT unit should rarely be your first option, and if you are not an Apple Authorized Service Provider (AASP) or in a certified training ...
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