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They probably use a special 'in-circuit' meter for testing the capacitors. They might check the ICs with a volt meter, and if the reading seems wrong, they then check the supporting components that are near that IC for faults. A bad resistor will probably have a scorch mark or some residue...
Be very careful when probing around inside a TV. In case you don't already know how, here is some information on safely discharging the CRT and high voltage capacitors; as well as some other information about working on a TV: www.repairfaq.org/sam/crtfaq.htm#crtcsa
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