M43-C1 adding cooling fan

[ztu165]

Hi guys, I have a 12V .2A cooling fan that I removed from a computer and I want to add it to this tv whose mainboard was not working as the BGA chip under the heat sink was not making contact anymore. Do I need the fan pulling in air to the heat sink or pushing air out? Should I install it directly to the heat sink or on the back cover of tv? Then finally the fan has three wires how and where do I connect them? I appreciate you guys helping me.

[budm]

Re: M43-C1 adding cooling fan

Did you try hooking up just the fan Black and Red wires to 12V power supply to see if it will spin?

[ztu165]

Re: M43-C1 adding cooling fan

Thanks for replying budm... yes I did and it did spin, however I went on and rigged the red and black wires to a USB cable and have it connected to the USB port on the TV. Do you think that will be ok?

[budm]

Re: M43-C1 adding cooling fan

https://www.badcaps.net/forum/attach...7&d=1577498150
Hook it up to the switched +12V so the fan should only come on when TV is turned on.

[ztu165]

Re: M43-C1 adding cooling fan

Budm I'm sorry for my ignorance, but the +12V you want me to wire it to is at the connection on the top left with the empty spaces correct?

[ztu165]

Re: M43-C1 adding cooling fan

I don't wanna mess this up...

[budm]

Re: M43-C1 adding cooling fan

https://www.badcaps.net/forum/attach...3&d=1577512189
It is on the connector CN?101 on the right, you can also see the pin-out chart for that connector.

[ztu165]

Re: M43-C1 adding cooling fan

Thanks for your reply budm, but I connected the fan to the +12V on that connector that you suggested and the fan still turns on even though the tv is off... what did I do wrong?

[R_J]

Re: M43-C1 adding cooling fan

Which pin number did you try? The +12V and the +12V_A should be switched voltages (Q9103) is the switch, It is located on the rear of the board.

[ztu165]

Re: M43-C1 adding cooling fan

Thank you for your reply RJ, I used the 3rd pin from the bottom of the right side. Do you think I should try the +12V_a on the left side?

[R_J]

Re: M43-C1 adding cooling fan

After checking the rear of the board, it appears that this board does not switch the +12 volts. On other versions of this board, Q9103 (plus many other components) would be installed and would be the 12 volt switch.

[ztu165]

Re: M43-C1 adding cooling fan

So what options do I have now?

[budm]

Re: M43-C1 adding cooling fan

Since the 12V is not switched on this board then you have to add a switched circuit that will be switched on when PS-ON signal is present.

[ztu165]

Re: M43-C1 adding cooling fan

Yeah guys this is starting to sound complicated... not sure I wanna continue. Can I just possibly wire it to the 5V pin and just live with it being on 24/7?

[budm]

Re: M43-C1 adding cooling fan

Your fan is made to run at 12V so does it run if you have only 5V supplied to it?
The pin is labeled as 5V/3.5V so is it really 5V or 3.5V for your board version?

[ztu165]

Re: M43-C1 adding cooling fan

Well when I had it connected to the USB port it was working, doesn't the port only supply 5V? The fan did sound less noisy when it was connected to the USB port...

[budm]

Re: M43-C1 adding cooling fan

USB is only 5V.
You can look up spec sheet of the fan to see what the min Voltage for the fan to operate.
Is it too loud when running at 12V?

[ztu165]

Re: M43-C1 adding cooling fan

Not extremely noisy, but you can definitely hear it... kinda sounds like a small hair dryer. Crazy thought but might the mainboard have a switching pin I can connect to?

[budm]

Re: M43-C1 adding cooling fan

I am sure that there is switched 12V for feeding the T-CON board, but adding the FAN to that switch may over load and also may introduce the electrical noise from the fan into the 12V for running the T-CON.

[ztu165]

Re: M43-C1 adding cooling fan

Ok so let's say I maybe wanna get into deep s#!% here and want to try to add the switching circuit mentioned earlier, how would I do it?