No high voltage, no help from the seller...

No eBay APP ID défined in Kunena configurationSome time ago, i bought 4 digit wemos nixie clock from ebay:

When it arrived and i found some free time i soldered everything, but the clock is not working. There is no 170v - i get only 6,5v on the test pins and irf640 goes hot. I have checked everything three times and it looks ok. I've got experience with soldering so i don't think that problem is relaed to improper assembly of the kit.

I wrote message to the seller and he answered me:

Hi, did you check the HV at the end of that part of the construction? Was there HV at that moment?

Things to check:
- Take out all other components from sockets (even 34063)
- Power on and see if the MOSFET gets hot - it is does the problem is with R3, D2 or Q1
- Check that the 2N3906 is the right way round and is not a MPSA42 (Q1)
- Check that the gate resistor R3 is correct and is making contact
- Check that D2 is facing the right way (silver band into the square hole)
- if you get replacement 34063, you can try one of those: normally they are very robust and don't break
- Are all components C13, D3, R4, R5, L1, RV1, Q1, U4, R3 and D2 installed? Install C9 if it is not installed. I know that the other parts D1, R1 and Q2 are installed, because otherwise Q2 will not get hot.

I checked things that he told me and after taking out all components from sockets irf640 stays cool. 2N3906 is the right way round and is not a MPSA42. 2n3906 is fine, i checked it with my multimeter. R3 is correct and making contact. d2 is facing right way. I tried replace 34063 but it did not change anything. All components are installed. C9 is installed...

I answered to the seller, but he did not respond.... So can anyone help me? I use 9v power supply, i have 5v output on test pins, only HV is not working. I m pretty sure that everything is mounted correctly.

No i did not. It is my mistake, i was thinking that kit is fine, so i soldered everything in one go. After that i tried to run kit without nixie tubes and checked voltages - 5v was ok, but no 170 at all - only get 6,5v.
I don't have oscilloscope.

Thanks for your answer. Im in my work now so i have only smal multimeter without capability of checking capacitors. At home i have big multimeter, and "MG328 Multifunction Transistor Tester Inductor Capacitance Resistance ESR Meter" only - no other testing stuff . So i can check this capacitor later.
Without 34063 in the socket i have 8,2 V at HV testing points.