Please help for schematic for this PCB DA41-00757A

[Competty]

Hi there,
I'm stuck whit this board, trying to find the issue why the motor controller on the heat sink is blown up (I'm at the early stage of troubleshooting so go easy on me) the fuse blown up as well, the big cap needs to b replaced and some diodes/SMD resistors or probably more stuff.
PCBs ID is DA41-00757A and its mounted on a Samsung Freezer Model:RZ90FABB
I'm following a Youtuber about troubleshooting PCB and find out some of the parts value is incorrect so i need to order new parts.
Which website is best match to order parts for PCB in Europe and please some one help me for schematic for this. Btw the freezer is 11 years old.

[jiroy]

Re: Please help for schematic for this PCB

This video , although in Arabic , is subtitled concerning the main parts and their functions in this PCB . For example , I knew the inverter IC part name as subtitled on screen and it's SLA6805M , as well as the other important parts like the TOP245P , etc .. So it's very useful .

https://www.youtube.com/watch?v=YakUBkPyhV8

[jiroy]

Re: Please help for schematic for this PCB

Here's another same case one , explaining that the TOP245P is mostly always the trouble maker in this PCB .


https://www.youtube.com/watch?v=mD-SDC4WuDk

[stj]

Re: Please help for schematic for this PCB

then i will add something i'v said in other threads.

whenever you get a dead TOPSWITCH device,
replace the startup capacitor - because it can kill the chip

[jiroy]

Re: Please help for schematic for this PCB

Definitely true , stj;

[Competty]

Re: Please help for schematic for this PCB

Thx for the replay, i ordered SLA6805M and TOP245P/startup cap and lucky me wiring schematic as well i uploading it in case some poor fellow ends up in same matters.

I will update soon as i got the parts.

Many thanks for all help.

[lotas]

Re: Please help for schematic for this PCB

If your compressor driver exploded, then it is likely that the micom UPD78F1201 (with locked firmware) suffered, and this is already a disaster, only the replacement of the entire board.

[Competty]

Re: Please help for schematic for this PCB

If your compressor driver exploded, then it is likely that the micom UPD78F1201 (with locked firmware) suffered, and this is already a disaster, only the replacement of the entire board.

you just killed that joy i had a moment ago, all R505-516 shows 200kohm (300kohm is the correct value) and R502 is blown away, ZD501 shows 0.121v and RK49 diode at 0.161v.

So is this dead or should i putt some effort on it and give it a try? or do you mean the main board as well?

[lotas]

Re: Please help for schematic for this PCB

You are not measuring something, you need to measure the resistance of the pins on the micom (microcontroller) relative to gnd, if these pins have low resistance or a short circuit, then only a replacement, then how lucky. And it's better to remove this exploded driver so that it gives an error in the measurement. Or power on, apply 5v to the controller and check if it heats up quickly.

[Competty]

Re: Please help for schematic for this PCB

I did a measurement on the pins you marked to GND and no resistance on any marked pins. Gonna remove the driver and do it again. Do i need to replace SMD resistor when they show 200K instead of 300kohm regarding the schematic?

I don't have a PSU, gonna order it today.

[lotas]

Re: Please help for schematic for this PCB

Remove the chip first and then measure everything again.

[Competty]

Re: Please help for schematic for this PCB

Remove the chip first and then measure everything again.

No short whiteout the driver ether.

[Competty]

Re: Please help for schematic for this PCB DA41-00757A

I change the parts and powered up the pcb, some reason i got 320v in the red marked area almost everyware on the board except REG1 area

Following parts is replaced:
C102
TOP245PN
D103
Reg2 AND Reg3
SLA680MP
Any idea whats going on?

[lotas]

Re: Please help for schematic for this PCB DA41-00757A

There is a different GND (-), on the hot side and on the cold side, and they are not connected, be careful.

[Competty]

Re: Please help for schematic for this PCB DA41-00757A

There is a different GND (-), on the hot side and on the cold side, and they are not connected, be careful.

Ok i got it but i dont have 15V or 5v on Reg2 or Reg3 or Reg1

[lotas]

Re: Please help for schematic for this PCB DA41-00757A

Well, there are two options, either they overlooked something and something else burned out with PWM (resistors, diodes, optocoupler, ...) or defective (substandard) PWM itself.

[Competty]

Re: Please help for schematic for this PCB DA41-00757A

Well, there are two options, either they overlooked something and something else burned out with PWM (resistors, diodes, optocoupler, ...) or defective (substandard) PWM itself.

Is it possible transformer is shorted? I desolded the transformer and messured all pins and get 0.1 ohm on the pins, i dont have any info on the transformer

[lotas]

Re: Please help for schematic for this PCB DA41-00757A

The main thing here is that there should not be an interturn short circuit on the power winding between 4-5 there should be several Om.

[Competty]

Re: Please help for schematic for this PCB DA41-00757A

The main thing here is that there should not be an interturn short circuit on the power winding between 4-5 there should be several Om.

Thx Lotas you found it, its only 0,8 Ohm so this is smoked. Now how to find the part? i trying to serch online for this transformer but no luck