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tv philips problems changing channels

Camila Abigail
hace 5 años
hace 5 años
hello good afternoon, I would need help since I have a 20-inch philips TV model 20pt4331 / 77r, I have problems to change the channel when I pressed ch + the menu is set, the other buttons are perfect, it is the only one that does not work I change it for a new one and exactly the same happens to me Thanks a lot
Camila Abigail
hace 5 años

Hi, I did what you told me to take out the others and leave that just the same thing still happens to me. I want to change the channel and the menu appears.
To all this I programmed a universal control and I am doing well
I do not understand..

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franciscovallarta
hace 5 años
hace 5 años
The microprocessor knows what function to do when pressing a key, for the voltage that reaches the pin of the key, for each function there will be a different voltage, this voltage difference is determined by the resistance value, which corresponds to each fabric, one side is ground and the other to a power supply, limited by a resistance, for each key it will be a different resistance value, this gives us the potential difference, I must check that that resistance is not altered, even if it is well, then proceed to alter that value slightly up or down, until you give the chanel function more, since as you replaced the swich, they are discarded .... greetings.
fernando perez
hace 5 años
hace 5 años
Change the resistance of that key to solve that fate luck
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