Maintenance of TCL color TV HD29E64S IV22 movement burning tube problem Open the cover carefully check the relevant circuit of the line tube, the line tube 5858 has broken down, measured 503 crystal vibration no problem, the line tube base circuit did not find the problem of virtual welding, so the new line The tube uses an oscilloscope to measure the waveform of the collector of the tube at the moment of starting, and the tube is broken at the instant of starting, and almost no high-pressure sound is heard. At the same time, the waveform of the collector tube is very blurred, and almost the waveform is burned without being established.
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Do not understand, remove the high voltage package to measure the ringing waveform is no different, basically eliminate the damage of the high voltage package, again on the new line tube, in the line tube power supply series 60W bulb, measure the basic waveform of the line tube, and surely find the basic waveform of the line tube, It is unfavorable at the end of the cut-off, replace the line to push the tube power supply filter electrolysis, found that the base tube waveform of the line tube returned to normal, remove the 60W bulb, turn on the machine, the machine returned to normal.