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Component in sonos sub mini

  • March 21, 2026
  • 4 replies
  • 37 views
Z

Hi everyone,

I'm repairing a Sonos Sub Mini (no power, no LED).

After extensive troubleshooting I found:
- Capacitor C713 was burned (replaced with 10µF 50V 0805)
- Chip U702 was defective (confirmed by oscillating output voltage 10-15V)

The original chip U702 is marked: 1342ENACE GJRSF in a SOIC-9 package (5 pins one side, 4 pins other side, body approx. 5x3.7mm)

I replaced it with NCP1342ENDCEAD1R2G from onsemi, but the output voltage is still oscillating 10-15V.

Can anyone confirm:
1. Which exact NCP1342 part number is a direct replacement for the 1342ENACE marking?
2. Has anyone successfully repaired a Sub Mini by replacing U702?

Thanks in advance!

 

4 replies

buzz
  • buzz
  • March 21, 2026

Have you checked the resistors? Looking at the photo, I’d want to clean the PC board. Also, with other manufacturer’s equipment, the adhesive used to immobilize components during fabrication and shipping sometimes becomes conductive. If any of the adhesive looks discolored, remove it.

Stanley_4
  • Stanley_4
  • Grand Maestro
  • March 21, 2026

There aren't many here that do internal repairs, if you haven't already you might look for other forums that have more repair assistance. 

There are a few topics here, best found using an external search engine as the internal one is weak.

Z
  • Znarf
  • Author
  • Contributor I
  • March 21, 2026

Thanks for the advice.

I have verified all resistors in the area (R721=68Ω, R715=150Ω, R240 all OK).

I will clean the board and check for any discolored adhesive.

buzz
  • buzz
  • March 21, 2026

OH, this is a speaker. After inspecting and possibly removing adhesive, you may need to reapply adhesive if the component might vibrate during use. This is usually not required, but you should use judgement here.

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