hello friends of the forum as they are in this opportunity I am writing to ask for your help I have this mine component SONY HCD-GTZ5 that they allocate the keys of the same one I have to have a key pressed to maintain the option but thus the others do not respond, examples when I select cd and loose the key appears usb or radio is the first computer that I got the truth I'm confused give me a hand that can be the rest in the power all well alone that can not be mastered if I select something is changed just wait your comments if Someone repaired this type of fault ... greetings

Hello friend to solve this fault the first thing you have to change is what you say keys that are actually micro suichs, you have to change all, if it is a series or two series, that is a rule, because if nothing else you change the suspect ones and you return the device because the others failed to loose again to uncover again, well after having changed the microsuichs Czech the voltage of the microcontroller, the clok also check the clok can be checked by measuring the voltage, the reset also me the Czechs and the transmission of data that I imagine you already know as it is checked mainly those that go to the memory EEPROM, and also the voltage that feeds this memory the voltage that reflects both the power of the micro as the memory feed must be reflected fixed in your tester ... well all this that although quisas with the change of all the microsuichs already is solved your failure I told you of these other checks to assure the repair of the fault, because as I say if you return the device have to open it for me is very cumbersome .... Lucky partner. And happy repair