FAIL: Tune in and after 2 minutes the image and sound are lost (it becomes black ) ... with dvd it does not present the fault ... without antenna I have normal tracking (rain) .... the problem is with antenna
Well, colleague, I again posed this question and they didn't give me a specific answer .... I still can't find the cause of the fault ... change according to the suggestions of the tuner colleagues, video filter, 33V diode and filter, the resistance that drops the voltage to 33V and follows the fault ......
What I notice is that when giving power the voltage of 33V is in 9.8V, but when turning it off at that moment the 33V appear and they are going down (since it feeds on the flyback) .... change filter of 33uf 160v of + B ... and from the source ...
the sinto voltages are normal, only the 33V fault ... suggestions
⚡ Descuentos en cursos en video - Lleva tu aprendizaje técnico al siguiente nivel y aprovecha precios especiales antes de que termine la oferta.
🔥 Aprovechar oferta ahora 🔥
Tube TVs
FAIL: Tune in and after 2 minutes the image and sound are lost (it becomes black ) ... with dvd it does not present the fault ... without antenna I have normal tracking (rain) .... the problem is with antenna
Well, colleague, I again posed this question and they didn't give me a specific answer .... I still can't find the cause of the fault ... change according to the suggestions of the tuner colleagues, video filter, 33V diode and filter, the resistance that drops the voltage to 33V and follows the fault ......
What I notice is that when giving power the voltage of 33V is in 9.8V, but when turning it off at that moment the 33V appear and they are going down (since it feeds on the flyback) .... change filter of 33uf 160v of + B ... and from the source ...
the sinto voltages are normal, only the 33V fault ... suggestions
Panasonic TV 14 "loses tuning signal
1.072
hace 5 años
hace 5 años
FAIL: Tune in and after 2 minutes the image and sound are lost (it becomes black ) ... with dvd it does not present the fault ... without antenna I have normal tracking (rain) .... the problem is with antenna
Well, colleague, I again posed this question and they didn't give me a specific answer .... I still can't find the cause of the fault ... change according to the suggestions of the tuner colleagues, video filter, 33V diode and filter, the resistance that drops the voltage to 33V and follows the fault ......
What I notice is that when giving power the voltage of 33V is in 9.8V, but when turning it off at that moment the 33V appear and they are going down (since it feeds on the flyback) .... change filter of 33uf 160v of + B ... and from the source ...
the sinto voltages are normal, only the 33V fault ... suggestions
17.741
hace 5 años
hace 5 años
Hi. In my opinion in ST the 33v is so present simply because it is voltage of + b.
As he says he has already changed components including the tuner, I think it can be printed cut or broken plate. Or bad welding. If it were the bad tuner or it would have tension at both ends of the R unless it becomes defective, it is also like the original and that goes well for a couple of minutes and gets short. I don `t believe. Many times the form is cut right at the weld peerimeter and is not noticeable. I hope you attend
17.741
hace 5 años
Better rest. Because if everything changed and the tension falls. It is the tuner he placed. It is bad as the other. Surely the capacitor and the diode changed?
1.072
hace 5 años
Yes friend ... I already delivered the TV. ... it is not profitable to spend with a TV like this ... you have to spend a lot of time, and the client does not want to invest either because it is already a bit old ...
46.781
hace 5 años
hace 5 años
Diagram here
file: /// C: /Users/ELENA/Downloads/NA6LV%20%20mn1874085%20%20an5165k%20%20str58041.pdf
Not always, the 33v tuning voltage is stable or fixed on the corresponding pin.
In certain models of the Panasonic brand the voltage that is presented or found in BTL (33v) itself, is the adjusted voltage of the channel tuned at that time.
If you do the test of changing channels and this voltage varies, it will corroborate what has been said.
Start with channel 2 and increase one by one
Here a reference of his subject
http://13norte.blogspot.com/2012/11/panasonic-tc-20b10p-no-sintoniza-canales.html
46.781
hace 5 años
Diagram Here
http://www.planetatecnico.com/foro/download/file.php?id=5604
In order to run the download you have to subscribe to the page
22.858
hace 5 años
hace 5 años
well first of all, the 33v voltage must be present, if this voltage falls the tuner does not work, the 33v comes from the 200v line of the flayback, the voltage is limited through the r559 of 68k 2wats, and stabilizes with the zener diode d006 and filter c003.
After changing the zener d006 of 33 volts, check the r 558 of 68k that is not altered, change the filter 003, after changing these components try again, if the voltage continues to fall, test the voltage at the ends of the r559 What voltage does it have at the input and output ... comment on your tests ... greetings.
22.858
hace 5 años
well I see that in return, the components comment on the voltage of the r559 at its 200v input, just to know if this voltage does not drop, when the TV is on.
1.072
hace 5 años
185 V .... I lift the pin of the resistance that goes to the hedge and measure with the TV on and measures 185 on each side ... and the e changed and measures the same ... the strange thing is that I connect it and turn off the tv and the 33V ... but with the tv on are 9.8V ... the other voltages of the flyb are fine
22.858
hace 5 años
Do not lightly resist the pin, measure it with the correctly connected resistor, say that already changed the tuner?
1.072
hace 5 años
Hello friend Manolo ... akbo to do the test and the 33V actually appear .... as soon as I solder the pin marked as BP, the voltage drops to 9.8V .... I follow the line and it has a surface fuse and arrives al groun ... maybe adding an R =? Where will Rfuse be able to maintain the voltage ... of what value can that R be ... or I am wrong ...
1.072
hace 5 años
I clarify that pin is NOT in continuity with mass .... and loose there is no voltage
1.072
hace 5 años
I apologize ... I was wrong ... vky do some last tests and I return tomorrow ... I will rest
1.072
hace 5 años
Well friends this TV, it was already discarded, the client does not want to invest, so thanks to all ... and the first one that answers will give you a solution. ..
¡Aprende a reparar con estos cursos YoReparo!
¿Tienes una mejor respuesta a este tema? ¿Quieres hacerle una pregunta a nuestra comunidad y sus expertos?
Regístrate gratis
Ad