Non responsive device after battery change

Hello,

I recently changed the battery on my Mid-2014 macbook pro retina (A1502). Prior to this only the battery had issues and everything else worked fine. Since this, my device no longer turns on. Reading other posts on here I have tested the following:

• Charger shows an orange light when plugged in.
• Charger light turns green briefly after completing an SMC reset.
• There is no fan spin when pushing the power button and screen stays black.
• Plugging macbook into charger with the battery disconnected does not turn the laptop on automatically.

Is there anything else recommended to test? What further investigations can be done into the issue to determine which parts need replacing?

Thanks for any help