Chosen Solution
Hi everyone, Today we have an iphone 6 with ios 11.2.5. Long story short i was checking my old logic boards and this one gave me a restore mode display i took my change and plugged it to itunes and voila it started to purr again or i was thinking like that. But then whenever unplugged the phone after screen go dark, it shuts itself off and start to bootloop. So as usual i tried with NEW battery same, couple different screens same, NEW front camera and same. When i put on charge sometimes turn on sometimes bootloop but with computer always turns on which is weird. anyways I checked with 3utools for battery life and it has good voltage and amperage, so looks good. But when i checked battery connector lines on logic board with my multi meter continuity mode shows 1600-1670. Could tristar chip started to failing or something like short? BTW all front components are Chinese 3rd party parts screen, camera flex, and home button and also battery too.
take a look at microsoldering.com there are answers about tristar
Sounds like tristar needing replacement. Definitely going to need board level repair at least for this issue.
