power supply unit-IC5308-low output voltage
In the input there is the 5,60v, output is lower than 3,7v, I install a diode between pin 8 and 1 (input-output) and then the unit works perfectly.
So, i bought a pair on them (10e each one, bought on a JVC service) and happy and does the same, the input is ok and the output is low. I bought on ebay one faulty with loading. There is the same problem, feeding the dvd unit with an external power supply everything works perfectly, so today I wanted to find out where te problem is, and found nothing. I have swapped IC IC5305 with 5308, then I have about 5 volts on both outputs, but the unit does not works, now I see they are not the same type, but first time I bought both 1665, and besides, I had 5 volts on each output.
Now I have installed a 1n4148 again, like the first unit, and it is working. The switching voltage is the same on both, and measured input is also good.
Do you know why is happening this, even with new Ic's?