There are instances where you need to take Hot side voltage measurements, but you need to be extremely careful. You work on the Hot side as little as possible when having the appliance turned on. The chopper transformer, opto-couplers and high voltage caps andor high value resistors are virtually the only components that are providing any isolation between the Hot and Cold side of any appliance. The current that could possibly pass through your body would only be dictated by the current rating of the PSUs main fuse. The Hot side of any SMPS is in effect connected directly at mains potential.ĭue to no isolation between the 240V or 120V mains power and the Hot side of the power supply, it has the potential to kill. Remember that the CRT is the load for those voltages, not the source of them Brian. The CRT base will have both ground and up to about 5KV on it for the focus control so treat it with care.

You are far more likely to damage the flyback transformer with the CRT disconnected. Is this one of the possible ways to verify the flyback is working Can I do something similar to test my FBT Thank you again for your time, and I look forward to get your advice so I can feel more comfortable when attempting the repair Best regards, e-music. With that being said, is there any precautions that I have to take in mind in order to protect myself from a deadly shock Do I have to connect all cables when taking the measurements or when performing the tests And by the way, Ive seen some crazy videos for some guys making sparks with the suction cup removed as they approach the back of the CRT while the set is on. The HOT was shorted out so I replaced it with a new one, but from what I remember, I didnt read any voltage around the Flyback Transformer. I remember testing only once with all the cables in place, and as far as I remember, I had a spark around the posistor area. I spent almost a week watching videos and educating myself about the inner workings of CRTs.Īll of the tests Ive done before (live ones) were with the main board connected to the mains only.Īll cables, CRT neck board, suction cup, and all others are disconnected while I was taking measurements.

Now, to be honest with you, I was a little bit scared to open these sets as I have never been exposed to a CRT TV before and I know that they utilize some potentially lethal partssections that I do not come across on a daily basis when dealing with digital electronics and embedded design. Tv Capacitor Crt Lcd Lethal Plus You Risk

Tv Capacitor Crt Lcd Lethal Plus You Risk.

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