Thanks for your comment! You are absolutely right! Presenting fault finding and measurements would be more interesting and it is something i try to do in the newer videos... Camera setup did not help for that plus the "first repair" with the second repair were many months apart which made more difficult to diagnose in front of the camera.
Good job, but you can't see much. Let me give you a hint that for video you need two light points on the left and right. The central light is reflected in objects and you can't see anything! Regards
I have a dead ctek with the resistor R26 burned too. So I plan to replace the resistor with a new 3.3ohm one per your video. But what caused it to get burned again? Is it the mosfet, the Schottky diode or both? Can you pls elaborate on where in the PCB is the mosfet that we need to replace? Thanks.
Of course! :) The very first thing that caused the problem are the failed capacitors... Now the the mosfet is the sot-23 i replace at 12:50 in the video, taking down to 0.25 speed may help to take a better look.... (most of the video is out of focus a bit) If i remember the To-220 diode was ok after all but it is pretty easy to check with a multimeter. Hope that helps!
The internal series resistance of the capacitor rises which heats up and boils the electrolyte inside the capacitor which in turn produces gases and internal pressure rises to the point that they blow their top in order to vent the gas. If you see the aluminum heatsink has a mark from their gases. Most of the capacitors have an indentation on top for that specific reason. It is a straight giveaway that the capacitor is damaged when you see the tops swollen like that.
Ctek MXS 7.0 is very different in design than MXS 5.0. You could always do a visual inspection of the capacitors inside if they are bulging of leaking and that would be a good indicator of the problem. Hope that helps.
The third capacitor is a low impedance 100uf 25V one... It was not broken really measuring about 88uf with good ESR. The Panasonic FR series (same model as the other 2 ones) is a good replacement.
here is a refined list if you can find any of those (but check pinout compatibility): eu.mouser.com/c/semiconductors/discrete-semiconductors/transistors/mosfet/?id%20-%20continuous%20drain%20current=3.2%20A~~8.6%20A&package%20%2F%20case=SOT-23~~SOT-23-3&pd%20-%20power%20dissipation=1.25%20W~~1.4%20W&transistor%20polarity=N-Channel&vds%20-%20drain-source%20breakdown%20voltage=20%20V%7C~20%20V%2C%2020%20V&vgs%20-%20gate-source%20voltage=-%2012%20V%2C%20%2B%2012%20V&rp=semiconductors%2Fdiscrete-semiconductors%2Ftransistors%2Fmosfet%7C~Package%20%2F%20Case%7C~Id%20-%20Continuous%20Drain%20Current%7C~Pd%20-%20Power%20Dissipation
Good job! It helped me to repair my Ctek too. Thanks a lot for sharing!
Thank you for your comment! Glad the video helped!
Hi! Nice work. I think it's even more interesting if you present fault finding and measurements as well, not just soldering.
Thanks for your comment! You are absolutely right! Presenting fault finding and measurements would be more interesting and it is something i try to do in the newer videos...
Camera setup did not help for that plus the "first repair" with the second repair were many months apart which made more difficult to diagnose in front of the camera.
Good job, but you can't see much. Let me give you a hint that for video you need two light points on the left and right. The central light is reflected in objects and you can't see anything! Regards
Thank you for your comment and input. That is so true... Will experiment with lights to get it better!
Great work and educational, you have a new subscriber
Welcome aboard!
Hallo können Sie mir bitte verraten welcher Starke hat SOT-23
30V 5,3A
oder andere werte hat er
Dankeschön
It is a N channel mosfet 20V 3.2A...
You are welcome!
VIELEN vielen Dank für
Thank you so much
I have a dead ctek with the resistor R26 burned too.
So I plan to replace the resistor with a new 3.3ohm one per your video. But what caused it to get burned again? Is it the mosfet, the Schottky diode or both?
Can you pls elaborate on where in the PCB is the mosfet that we need to replace? Thanks.
Of course! :)
The very first thing that caused the problem are the failed capacitors...
Now the the mosfet is the sot-23 i replace at 12:50 in the video, taking down to 0.25 speed may help to take a better look.... (most of the video is out of focus a bit)
If i remember the To-220 diode was ok after all but it is pretty easy to check with a multimeter.
Hope that helps!
@@varnasfix thank you so much!
How do you know you need to replace the capacitors? Mine doesn’t seem bulged at all.
Why that capacitors 1000uf 16 volts swollen ?
The internal series resistance of the capacitor rises which heats up and boils the electrolyte inside the capacitor which in turn produces gases and internal pressure rises to the point that they blow their top in order to vent the gas.
If you see the aluminum heatsink has a mark from their gases.
Most of the capacitors have an indentation on top for that specific reason.
It is a straight giveaway that the capacitor is damaged when you see the tops swollen like that.
Hey, what could be wrong with MXS 7.0 when i get relay clicking sound, and charged stopped at second phase? Thanks
Ctek MXS 7.0 is very different in design than MXS 5.0.
You could always do a visual inspection of the capacitors inside if they are bulging of leaking and that would be a good indicator of the problem.
Hope that helps.
What is the other capacitor you replaced? Do you have a link to the other cap? Thank you
The third capacitor is a low impedance 100uf 25V one...
It was not broken really measuring about 88uf with good ESR.
The Panasonic FR series (same model as the other 2 ones) is a good replacement.
what kind of replacement of NVR4501 can I use? its not available in my country :(
It is a powerful N mosfet, VDSS 20V, VGS ±12V, ID 3.2A, Pd 1.25W. Any other with similar characteristics should be OK.
here is a refined list if you can find any of those (but check pinout compatibility):
eu.mouser.com/c/semiconductors/discrete-semiconductors/transistors/mosfet/?id%20-%20continuous%20drain%20current=3.2%20A~~8.6%20A&package%20%2F%20case=SOT-23~~SOT-23-3&pd%20-%20power%20dissipation=1.25%20W~~1.4%20W&transistor%20polarity=N-Channel&vds%20-%20drain-source%20breakdown%20voltage=20%20V%7C~20%20V%2C%2020%20V&vgs%20-%20gate-source%20voltage=-%2012%20V%2C%20%2B%2012%20V&rp=semiconductors%2Fdiscrete-semiconductors%2Ftransistors%2Fmosfet%7C~Package%20%2F%20Case%7C~Id%20-%20Continuous%20Drain%20Current%7C~Pd%20-%20Power%20Dissipation