Philips TV 20 pt 4331 / 77r turns on but gives no image or sound
Hi. Go back to the last steps you did by checking if, in case of doubt, do not turn upside down any electrolyte.
Verifying that you did not leave pins attached with tin remains.
A question. When you give PW do you feel AV (high voltage)
Hi Luis Tartaglia, I'm going to check again, I left it for a while because I was already nervous about the matter .. haha .. but I had already been reviewing and I did not seem to see anything weird .. regarding the discharge question tension? Do you mean flyback? because if so, I was already measuring and I only measure in the primary, I have 94 volt ... but at the exit I have no voting ... and that is what disorients me because before opening to change the capacitors the TV was
hello EVELIO RIOS thanks for answering something I was already seeing just leave a while to resume later a little quieter ... but so check the capacitors are fine. As for the voltages, what voltages should I measure? Where do I have to start?
Here you download the diagram:
https://sites.google.com/site/rtphilipssm/rtsm/L03.1L%20AA%20TV%20PHILIPS.pdf?attredirects=0&d=1
What voltage is in capacitors 2561, 2564 and 2570?
ok thank you friend tomorrow I will continue with the TV and take the voltage measurements and comment .. greetings
Hi friend, I was already seeing this service manual, I have it, but as I told you before opening the TV I was just presenting the image with vertical problems
If at the same moment of giving PW you do not feel that the tube is magnetized, it is because the TV does not oscillate. Remember that when you take apart the TV, move the plate. The same happens when changing components. You may have false contacts. Review welds in a horizontal circuit. Flayback Drive transformer. That this placed the yoke tokens. It measures the voltage in the transformer driver in ST and without taking the tester from there it gives PW. To see if there is a pulse. It controls well the form that is not cut.
Does the diagram correspond exactly or not?
thank you for your time friend ... this is the tube does not magnetize ... I will take it again and more calmly I will check everything, welds, tensions and I will see what happens and I comment ... thank you very much and just have news I will let you know
Oh, I forgot to tell you that the diagram says that it corresponds to 20pt4331 / 78r and the TV that I have is 20pt4331 / 77r, I would have to watch it well, but a priori it seems that it is not exactly the same
yes yes I have already seen that other colleagues also say that this is the diagram of that TV ... well I think tomorrow I will continue with the check of welds and voltages and what can be done .. for today thank you very much and when you have news I comment ... greetings
Hi, I want to thank you for your help and time ... today I go back to the TV in question, well, I desolde clean, I soldered again, weld all very carefully and the TV is working and the vertical fault is solved ... thank you very much for the comments and give finished the subject .. greetings