Tv Philisp 20GX1850 / 85R does not energize the flyback.
suggestions. The source voltje is fine in 95vcd. 1.- connect your frequency meter at the base of the horizontal output transistor and check the frequency 15750 cycles.- we have a diagram that matches the vertical ci, but the jungle is tda 8363 c. .2.- you remove the flyback and check with a meter to see the filters, both the vertical ones, and the secondary ones of the flyback.- check the jungle number and confirm. comment. regards. Felipe ascended PD Master Victor.- I already saw that he was justified in the contribution of the filter voltage. regards.
I will send you the diagram of a vpp probe (peak to peak voltage). - Here we are going to take advantage of what seems to have oscillation. pin number 6 has a reference of 248vpp, the heater (filament has 23.2 vpp). - those are the two references that we will use. So you have a load. the flyback b + pin places an external 15 / 50vcd source. put the probe in the heater (it has to be placed) it gives power and observes, comment how much the probe marks.
PRECAUTIONS.- Do not connect the probe, or the multimeter in the collector of the horizontal output transistor, to the voltage of the original source .-- procedure to check the fllyback in the circuit. (the slightest doubt you have comment) .- 1.- connect the probe in the hot collector, 2.- check the voltage of the original source (95vcd), 3.- check the voltage of the external source (we use 30vcd) .- 4.- "rule of three" 30vcd per thousand is 30mil, between 95vcd is 315vpp, this is what the probe should mark at 30vcd. Comment on what source you have and we make the account. regards.
I did a flyback test, in another philisp chassis that works well and the flyback is very similar, and I work well, of course on the horizontal side, just place the collector and yoke pin, the B + and earth pin and it already gave me high voltage, leave about 20 minutes and work well
Then I will connect the secondary, is that in this chassis the vertical works with 12 votes. there little by little I am discarding and with your help and that of other technicians who want to help me. And the Antonio Felipe project, I will try to study that.
The H.out transistor is the first one that measured, measured well, but nevertheless replaced it with a new one, taking care of its quality and characteristics.