Macbook Pro A2159 recycling every 2-3 mints

Hi,
I’ve got a MacBook Pro A2159 (820-01598-A) that keeps recycling before chime/Apple logo every 3–4 minutes.


No visible damage or broken components found. The following signals keep rebooting every 2–3 minutes:


  • PP1V8_AWAKE
  • PP1V1_SLPS2R
  • PP3V3_AWAKE
  • PP1V8_SLPS2R
  • PP0V8_SLPS2R

Meanwhile, these remain stable:


  • PP3V3_G3H_PMU_VDDMAIN
  • PP3V3_G3H_RTC

Any thoughts on what could be causing the issue?
 
Top