An ESR check is using a specialized piece of test equipment to a capacitor. This equipment costs between $40 to $80. If you are just fixing the one monitor, it is cheaper to replace all the (big and small) capacitors on the board regardless if they are domed or not. Capacitors do not have to be domed in order to be bad.
To check the rectified DC on the large cap, you will need a multimeter. This DC voltage should be around 165V DC if you have 120AC voltage. Caution is required in measuring main voltage. If you are unsure how to do this, get someone who knows how.
Originally posted by rokkaholik
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