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SAFETY The primary danger to you is from the input side of the supply which is directly connected to the AC line and will have large electrolytic capacitors with V or greater DC when powered often, even if the supply does not work correctly and for some time after being unplugged especially if the power supply is not working correctly but does not blow fuses.
The filter capacitors used in many switchmode power supplies can store an amount of energy that can kill - always discharge and confirm this before touching anything.
There is also risk of instantly destroying expensive parts of the supply and any attached equipment as well like the switchmode power transistor if your probe should slip and short something either directly or by killing the feedback circuit.
These guidelines are to protect you from potentially deadly electrical shock hazards as well as the equipment from accidental damage.
Note that the danger to you is not only in your body providing a conducting path, particularly through your heart. Any involuntary muscle contractions caused by a shock, while perhaps harmless in themselves, may cause collateral damage - there are many sharp edges inside this type of equipment as well as other electrically live parts you may contact accidentally.
The purpose of this set of guidelines is not to frighten you but rather to make you aware of the appropriate precautions. Repair of TVs, monitors, microwave ovens, and other consumer and industrial equipment can be both rewarding and economical.
Just be sure that it is also safe! Always keep one hand in your pocket when anywhere around a powered line-connected or high voltage system. Wear rubber bottom shoes or sneakers.
Set up your work area away from possible grounds that you may accidentally contact. TVs and monitors may use parts of the metal chassis as ground return yet the chassis may be electrically live with respect to the earth ground of the AC line.
Microwave ovens use the chassis as ground return for the high voltage. In addition, do not assume that the chassis is a suitable ground for your test equipment!
If circuit boards need to be removed from their mountings, put insulating material between the boards and anything they may short to. Hold them in place with string or electrical tape. Prop them up with insulation sticks - plastic or wood.
In a TV or monitor, if you are removing the high voltage connection to the CRT to replace the flyback transformer for example first discharge the CRT contact under the insulating cup at the end of the fat red wire.
Use a 1MM ohm 1W or greater wattage resistor on the end of an insulating stick or the probe of a high voltage meter. Discharge to the metal frame which is connected to the outside of the CRT. An implosion will scatter shards of glass at high velocity in every direction.
There is several tons of force attempting to crush the typical CRT.*Tek-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. When Outlook falters, productivity and vital business communications take a big hit.
These troubleshooting measures will help you resolve problems quickly. When Outlook falters, productivity and vital business communications take a big hit. These troubleshooting measures will help you resolve problems quickly.
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