problem with a cce tv
Hello, the + B has to have 103V, there is a problem in some component that is lowering the voltages, I measured the transistors of the source including the horizontal TR. The voltage of R830 comes from the D808 diode that brings 16V to the transistor Q804 to regulate 3.3V that are used in the micro.
Greetings companion next to the r830 a and another parallel resistance this resistance is 15k and from 3.3v and come to the Q804 through the collector and the r830 leaves a voltage of 10v to the
The other voltage that leaves the r830 which is 10v reaches the base of the Q804 because the r830 resistor gets too hot.
No, that voltage reaches the collector of Q804, if it gets too hot it is because too much current is circulating, you should check that there is no short or leaking component.
Ok companion the tension that comes out of the r830 goes to the collector exactly as you say but next to the r830 I have another resistance of 15k and votes a voltage of 3.3v and is terrified at the base of the Q804 now I am already checking all the components of the secondary power, but I trust that there is a bridge that goes from the diode test, D808 to the track that goes to the resistance r830 when the bridge is removed, the tension in the cathode of the D808 rises to 25v and in the + b me raise it to 180v I place it again and lower again 10v and in the + b 89 v greeting
If you refer to R831, it is 1K5, not 15K. and gives you 3.3V for the zener diode DZ808
Ok I followed the track of the Q804 transmitter and this one took me to the L705 which removed some of its leg and the led light to flicker this L705 is near the jungle if I re-weld the leg the voltage drops and the r830 heats up
If L705, 706 and 707 feed the microphone on three different pins, it is very likely that the microphone is damaged.
If companion is already all the tests and there is no doubt that the mike is damaged, I want to thank you for your help.
