I don't think so. It's a new one. By the way: The 5V(with light) and 4V(without light) has taken by measuring between GND and pin6 of the PIC.

The measurement (GND and PIN6) okay. Increase your pull-up resistor! Be 220kohm.

A változásnak drasztikus +5V és ~0V kell lenni
The change must be drastic +5 V and 0V ~

May be the light from the IR led of the base is not good enough :/

May be the light from the IR LED of the base is not good enough :/
Infrared LED lights will not light good then bad. temporarily replace normal light LED can illuminate how

how can I probe the phototransistor in the air with an ohmmeter?

With a supply (5V) a resistor and the phototransistor make the circuit similer in rotor. Measure voltage on the collector of the phototransistor. With no light the voltage should be over 4.0V, alighted the voltage should be under 0.8V. May be the wave length of IR led and the sensitive range of phototransistor don't match.
Have you isolated the RB0 pin of PIC from the supply?

be without any extra lighting illuminated high resistance low.
Or turning right polarity +5 V and 480Ω resistor and an LED illuminates the IR-aware transistor or a LED or light up or not

Nothing changes. I have a new one, but I don't know if this is a phototransistor or photo led. How can I note the difference?

Nevermind... the photo-transistor was broken. Now I have 4V with light and 0V without light... well, this problem solved, but the lights starts for a while, then shut down on every ON/OFF button pressing. Look at the video.

Do you think that I have assigned the same button to start led's and motor, so when I start motor, stops leds as well? (I don't know... Just asking)

Photo transistor measured ~ 60cm normal neon-lit
varies depending on the lighting conditions, the resistance

This issue is solved. Now I have 4V with the IR Led and ~0V without lights. I posted this video that shows the remaining issue (the led's starts but they stops immediately. When I turn off the motor, the led's starts again another while, and shut down again, this time the motor stops as well).

Watch out! If the low speed (rotor), no display.

OK, I will connect my motor to another power supply, and see what happens (so I can check if the base is working good or not).

The turnaround should be relatively stable

The motor spins slow... even if I connect it to another Power supply. The clock is too heavy, it seems...

minimum speed of 900 <

Ok. I have to do a counter first... so give me time

no need to compare the counter looking at ~ 1500 pc power supply fan speed

VERY slow, compared both working... the rotor part is kind of heavy...

Heavy is not problem. First, very important the rotor balancing...

You mean this? (see picture) I can make that this keep like this adding some things to the board...

I said, balancing horizontally and vertically. You can use weights, screws or soldering tin.

You need the opposite situation: Over 4V without lights and ~0V with IR Led on.

I've done so

I have this situation: 4V without lights and ~0V with lights

4.0V maight be a bit low since high level threshold minimum is 0.8*Vdd. Consult the datasheet.

Maybe because I changed the pull up resistor before.

Now I have another issue: The Base PIC doesn't wants to erase. I have pickit2 and it's software