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TV and Video

Philips 20GR1355 / 54R Without horizontal oscillation.

Daniel3878
hace 5 años
hace 5 años
Hi Colleagues! Comment: The TV came with the failure to not turn on. I had cracked a pin from the HORIZ yoke connector. [/B] In that [b] the TSH C3795B was short. [/B] From there! when switching on, the 95v starts but [b] the horiz signal does not appear on the TSH base. It was measured with the oscilloscope at startup; only a small movement of tension of 0.2v and disappears. I need an opinion and we tried. Greetings !!!
TobíasTv
TobíasTv
13.721
hace 5 años
hace 5 años
How weird, always with that fault I changed the transistor and walked out, you would have to see the start voltage arrive at the oscillator ic, which jungle uses, tell me and I add information in this response Here you can download the diagram, you will have to subscribe, it is free and useful http://www.archivotecnicosaurios.com/descargas/tv/seccion_ordenada/9537_Chassis_GR1-AX-LA.pdf notice if you get 12 volts to pin 7 of the tda8305 and if it comes out horizontally by pin 26, if this TV has the vertical short it does not start Successes
Daniel3878
hace 5 años

The jungle is a TDA8305. I'm checking tensions.

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TobíasTv
TobíasTv
13.721
hace 5 años

yes yes, read my answer well, add information and test points on tda8305, luck with the tests, I also left the diagram for you to study

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Daniel3878
hace 5 años

Pin 7 there are 3.8v.

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TobíasTv
TobíasTv
13.721
hace 5 años

there you have your problem

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TobíasTv
TobíasTv
13.721
hace 5 años

those 12 volts come from the flyback, the on off comes from pin 19 of the micro ... take the power to the vertical ic to see if it starts and discard ... lean on the diagram, study it
Successes

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Daniel3878
hace 5 años

Take out the vertical CI7500, with no results. This voltage that reaches the pin7 of the jungle, comes from diode 6635 of the source stream; Which is indicated on the plate 9v and is measured 5.2v. The oscillation of pin 10 of the traffic has about 10vpp, but after the shock resistance and the diode we have 5.2v. I made a can to shock resistance and it increases 0.5v but it still does not reach; The capacitor and diode change them, without results. I'm still in search ...

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Daniel3878
hace 5 años

First of all I want to clarify that tonight I found a detail that I had not seen; With a camera I noticed that the board has an insignificant line next to the flyback. As if he had been beaten and the plate bent. It seems that there are one or several circuits cut under the paint that are not cut. I will comment results.

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Daniel3878
hace 5 años
hace 5 años
Problem solved. It happened that the power supply circuit for the horizontal Tr driver was cut. From there he detected an error if the oscillation did not start, and he never turned on the green standby LED. The Pin 7 of the jungle, has 12v when the flyback starts, but has 3.8v to stay. I upload board images and errors; The circuits were welded; But despite putting cables is not presentable, it was done the same to reinforce it. I await response to close the post. And I appreciate the great help to solve this problem; That now is a peek, but I recognize that they are revision errors.

¿Conoces una solución?

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