Cortezz
Junior Member level 3
I have a cooktop which SMPS is bad.
It should produce 24VDC but it only does 16V.
Here is a schematic with a very similar topology.
It works with a TOP254GN IC.
For first I tried to change 3 main components
as all other parts looks fine and as these 3
tend to fail on this panel as I read on forums:
- D6 Diode (original SMD mark: T4X5) -> replaced with 1n4148 kind of diode
- U1 TL431 (original SMD mark: 43A) -> replaced with a normal SMD 431 IC
- UFB1 Opto (original SMD mark: 181.002A) -> TLP185 and then HCPL-181-000E
But now the output voltages jumps so it's even worse when I started... :-(
My main question is:
Which part is now specific in such a design and which has to be chosen carefully?
My hint is the opto but I couldn't find the datasheet for the original one.
So I chose a standard one but I'm not sure about the CTR for example.
Could you give a hint or what are the methods of localizing such an error?
Thanks in advance for any help!
It should produce 24VDC but it only does 16V.
Here is a schematic with a very similar topology.
It works with a TOP254GN IC.
For first I tried to change 3 main components
as all other parts looks fine and as these 3
tend to fail on this panel as I read on forums:
- D6 Diode (original SMD mark: T4X5) -> replaced with 1n4148 kind of diode
- U1 TL431 (original SMD mark: 43A) -> replaced with a normal SMD 431 IC
- UFB1 Opto (original SMD mark: 181.002A) -> TLP185 and then HCPL-181-000E
But now the output voltages jumps so it's even worse when I started... :-(
My main question is:
Which part is now specific in such a design and which has to be chosen carefully?
My hint is the opto but I couldn't find the datasheet for the original one.
So I chose a standard one but I'm not sure about the CTR for example.
Could you give a hint or what are the methods of localizing such an error?
Thanks in advance for any help!