This day, an uncle of adjacent village, say the television is bad, call let old boy come to maintain. Old boy goes looking, switch on the mobile phone try machine, the lamp shines, but by channel key does not have reaction. Should be bad. Tear open directly machine, this is an old picture tube pure smooth color television, uncle says not to want to change now, wait for son marriage to change great color television again. Rural person is to be able to be used more very use, do not buy until the last moment new. Measure key-press board, key-press is not effective also. Change after all key-press, key-press can have the lamp to shine, but still cannot leave machine. Microscope travel canal does not have short circuit, + B voltage also has, measure a tubal B class to do not have voltage, check down circuit upgrade, discovery drives transformer to do not have power supply all right, measure drive power supply resistor all right, two end resistance above of hundreds of K, apparent travel drives power supply resistor bad. Looked for a 5 tile, the high-power resistor generation of 3.3k changes bad resistor, blueprint of the search on the net must come to data. Now network very develop, do not know go on the net search. Uncle husband and wife two watch long TV quite cool still! Change drive power supply resistor to try all right machine, everything is normal. Old boy builds so old TV set, also be to see this situation with this bad resistor for the first time!