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Tube TVs
TV. TRC heats the coil.
192
hace 5 años
hace 5 años
Hello friends, I got a conventional tv attached the diagram so you can help me please, first I gave a horizontal line, then I changed a capacitor (c305) and the image came out complete, but it began to heat the winding that has the edge of the tube of cathode rays and there was a small sign of smoke. I proceeded to disconnect it from the network. What surprises me are the following voltages that leave STR I801. measuring ground with outputs 2,3,4. It has the following voltages. 3). 340v. (2 and 4) 119 v. those 119 V. reach the flyback on pin 2. what is not like locating the + B. on this plate and please some help to take action and perform tests to get it afloat and very grateful in advance.
http://www.archivotecnicosaurios.com/descargas/tv/seccion_ordenada/8970_Chassis_C-750.pdf
12
hace 5 años
The + B is right there on pin 2. It must be around 103 V. The smoke in the deflection coil must be removed from the screen tube, with extreme care. She comes with rubber wedges between the coil and the glass of the screen and sometimes sulfates sulfated by itself, and is the cause of the smoke by short-circuiting that part due to moisture. Luck.
192
hace 5 años
thanks for answering. My big question is about the voltage of 340. In the diagram it does not show that amount of voltage and that is why I consult, now that of changing the winding has never been done and it would be a work without value for an old TV. It doesn't seem to me first to rule out any fault in the circuit and then proceed to winding. in that if you can help me grateful.
hace 5 años
hace 5 años
Hi Mariscal850, the diagram you attached does not correspond to the TV you have because it has a STR 50103 that regulates 103 v and it has a STR 1801 on your TV. The 119v that you measure on the TV are from + B and are fine and they are the same that reach pin 2 of the flyback and the 340v that you have on pin 3 are the same that you should measure in the large electrolyte that is at the input ( from about 100 to 200 uF x 450V). The problem, as the colleague said is in the yoke coils, placed on the neck of the tube that is sulfated by the 3 rubber plugs that are underneath and gather moisture. You must change it for one of another disused TV. Sometimes taking it out you can isolate the sulphated coils and it continues to work.
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