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Tube TVs
Chinese TV chassis PH08KX-N35 DOES NOT HAVE B +
24
hace 5 años
hace 5 años
Hello, I have a chassis TV mentioned pho8kx-n35 that has zero volts in b +. disconnect the flyback line and nothing replace resistance of the 150 k and 100 k source control and nothing ... the other voltages of the output choper are ok the only one I don't have is the b +
30.814
hace 5 años
hace 5 años
Hello Friend. check the filters and diodes and resistors after the choper those are known to leak or devalued and check the tsh. and filter the + b. it may be dry. Cheers
2.308
hace 5 años
hace 5 años
companion. after you have done what the teachers indicated. suggestions. 1.- remove the flyback and the horizontal output transistor, place a 75 / 100w focus of the bmas pin of the flyback to ground, in this way you will only work with the source. connect everything and check if you have voltage. Do not connect the flyback or hot, until you have the stable source. greetings everyone. Felipe ascencio
6.834
hace 5 años
hace 5 años
If you have all the voltages of the source, except for + b, check diode VD559, it must be open or you may have a cut track
24
hace 5 años
The tsh was changed to another to rule out errors. the rectifier diode also to the same transistors .. strange thing is that when I disconnect the track taking the sample gives me 110 V in Stanby. and voltage that is higher than the source control anulando.entonces q is this not what will be pulling to zero.
9.501
hace 5 años
hace 5 años
hello buddy: since you don't have the voltage of + by and there are the other voltages at the output of the chopper well ... you have measured on C567 of 220mfx160v..if the 110v of + b ... you have the voltages in ( C161a = 11v) ... (C558 = 16V) ... (C563 = 14v +) ... (C562 = 14v -) ... if these voltages are correct it is xq, the source is regulating well ... and the 110v voltage should be in C567 ... otherwise the source would trip and the voltages would be other ... measure back in C567 if there are 110v ... comment if the data q, take from the chassis ph08k-n22 coinside with those of your plate ... Greetings !!
24
hace 5 años
thank you colleagues and your comments and experiences I failed ... the problem was that the optocoupler is not working due to a broken track that came from the source of the choper. 9 v of the 12 coming out of the choper to feed the audio. in if of the 4 pins of the optoclopador only three are in operation the other was the broken track
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