Yes, I’ll do that first.
Just ran for 1 sec. and then turned off and smoke came off.
The fan is mentioned on their product page with power 12V and dimensions 40mm40mm15mm with the pricing of 9USD and I searched on the google and found the fan with same specs with price for just 1$. So that’s what I was willing to know if I can buy that fan and connect it.
From the fan itself or just the board? I’ve accidentally run 12V fans at 24V several times and never had a fan die. You may get lucky here.
Without knowing anything about the fan it may connect, but in reality you don’t know what you’re replacing and you don’t know what you’re getting. The fan is designed to work with the overall laser module to provide adequate cooling. If you get a fan that isn’t specified to the same performance it’s uncertain if it will be adequate. It may work for some time but then fail prematurely, or it might be fine… or it might perform better than the stock fan. But without knowing the performance specifications you’d be just guessing.
But as I said before, I’m not familiar with the specific fan requirements or replacement fan options that are available.
I literally have no idea. I’ll get it checked tomorrow.
I don’t think there should be much of a performance issue because the Neje’s fan is 40mm x 40mm x 15mm in size, 12V power and 10800 rpm and I’m getting the same fan from the local market or from some websites. But I’ll get it checked first then see what next have to be done.
@berainlb right you are guessing.
Even with all of those correct, what is the pitch of the blades. Shallow pitch, lower air movement with same rpm, requires less current = cheaper to make + lower customer cost = we get more money…
IMHO, by the time you have done all of this, it would have been lower cost and quicker to just buy another one. Seems you are heading that way anyway… how long is this thread now?
I got the board replaced and the fan and laser, both are working fine. And for one last time I want to know that, will connecting only ground and ttl wire won’t do any damage to the laser again?
How did you test this?
Did something change in what you were asking since the last time? If no, then this is fine.
Through this board
Nothing has changed, machine came , I burnt the laser, ordered new driver and got it changed today only and checked that laser is now working.
Does fan come on automatically when you use the test button on the adapter board? If so, that’s good. And sounds like you confirmed the laser works. That means power is working.
So yes. Do GND and TTL only to the controller and you should be fine.
Yes it does and on pressing the test button, the laser turns on at full power.
This is the final connection, as you can see red wire has been removed from both ends and only ttl and gnd is connected to the board.
So should I connect the laser and turn on the machine ?
Sorry, I’m asking again and again but I’m extremely worried. 
with this connection how do you power the laser head? you use the 4 wires cord to the laser? and a different power source connected to the 12V near GND and TTL?
I didn’t realize you moved to input A. I can’t see the labels on the other side but if you’re certain black is ground and white is TTL then you should be fine.
ok this is the rigth way 
quite exactly like my Neje module
Yes, in the machine’s board , black wire is plugged in to the gnd port and white to the ttl.
Fire it up. Let us know how it goes.
Sir…
It worked. Finally. 
Haha. It’s a beautiful day. Congratulations on the recovery. 
Thank you so very much sir for guiding me all through this.
May god bless you and your family with a happy and healthy life. 
congrats, glad for you. You’re in business again 
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