projector Cheerlux CL720 with damaged psu

[robgerr]

Hello to all friends of the forum. This projector will not turn on after a power surge. Disassembling it, I found the psu with burnt components, I found a large carbonized resistor, burnt smd resistors, short power mosfet, and two small smd smeared transistors, The ic switch is a ld7575ps. Do you think it is possible to go back from another scheme to the components that can be replaced since the names are not legible?

[R_J]

Re: projector Cheerlux CL720 with damaged psu

I can't see the pictures, use Go Advanced - click on the paper clip to attach the pictures

[Diah]

Re: projector Cheerlux CL720 with damaged psu

before 3 years i got one same the Chinese LCD led projector with power board toasted at the primary AC -DC section, i tried to find component but failed,so i took all the AC-DC parts out from PCB remain only the Transformer and the DC parts of the unit and the LED. used normal power board 20W AC to 12 Volts and put the projector transformer on it to produce 12 v and 35v to led.. and its work till now.. and the LED going more bright as before too.

[robgerr]

Re: projector Cheerlux CL720 with damaged psu

[robgerr]

Re: projector Cheerlux CL720 with damaged psu

I thank you for the answer, but do I have to connect the 12v in the primary side of the transformer or in the secondary?
I noticed that in the primary and secondary side of the transformer there are more outputs, in any case this power supply works with two voltages, 12v and 35v in output

[Diah]

Re: projector Cheerlux CL720 with damaged psu

i used only the hot area from the power supply and put on it the Transformer and the DC COLD area of the Proj. board. as i said. the Transformer out put only one 12v but the Proj. one had 2 35 and 12. the good things the input of Chinese power supply transformer almost the same with 4 pins so you may connect the Original TR with wire as the size and position of pin at hot area different or opposite. don't forget the OPTO of the original board to connect to the diy one you use.. look at photos IMG its yours board and other are the diy one i used