Electronics > Repair

Help identifying blown IC

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Kaar3l:
Hello!
I have circuit board from garage door opener motor. That board is providing power when the opener is in standby mode. So the garage door opener works but when it goes to standby after 90 sec it dies. I have identified that one chip is broken and on the chip are markings SC…….. The IC should help to create the standby voltage. I did identify capacitor negative side C4. The output from here should be 12v, on the mainboard is marking 12v at VCC pin.
I also did measure voltage on C4 and it was very high about 300v. I will measure later again.

It seems that it is some kind DC-DC voltage converter.

coromonadalix:
check LNK62XDG  LNK304DN-TL    ....  datasheet  ....
TNY278GN



but yours seems  SC ....   ???    Semtec SC2608   SC1104B  ....

you have to search  SO-8C  packages

fzabkar:
The logo appears to belong to Power Integrations.

https://www.power.com/products/ac-dc-conversion

Kaar3l:

--- Quote from: coromonadalix on September 13, 2024, 04:48:22 pm ---check LNK62XDG  LNK304DN-TL    ....  datasheet  ....
TNY278GN



but yours seems  SC ....   ???    Semtec SC2608   SC1104B  ....

you have to search  SO-8C  packages

--- End quote ---
TNY278GN schematic in datasheet seems very very similar, only some few details seem different.
The board has name: et-evopwb-r

I'll be looking other datasheets.

coromonadalix:

--- Quote from: fzabkar on September 13, 2024, 06:05:27 pm ---The logo appears to belong to Power Integrations.

https://www.power.com/products/ac-dc-conversion

--- End quote ---

that would maybe  LinkSwitch-TN2Q  ???
https://www.power.com/sites/default/files/documents/rdr-707q_9pt75w_automotive_non-isolated_buck_linkswitch-tn2q.pdf

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