LG Magna does not turn on, only when plugged in, will it become stuck on logo reboot - LG Magna Questions & Answers

Basically the title, the phone is a LG-H500f. the battery seems to be working fine according to the multimeter, and the terminals on the phone as well (thinking it was a battery issue). The phone will not turn on at all, when i plug it to the charger or computer the battery symbol appears, then it just goes to the LG logo and reboots nonstop. Any help, guidance or advice would be appreciated thank you guys so much.

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Is my phone dead?

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Subsequently, power button did nothnig. After removing/replacing battery and powering on, I get the same LG logo for a few seconds, then nothing.
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I'm new t this forum do sorry if wrong category or something else.
Let me get to the point. Today I wanted to replace the battery on my G2 because the old one was draining really fast. I bought a brand new battery and I removed the old one and plugged the new one in. I reboot the phone and it boots up to the pin entry screen and it says Battery 0% too low to continue and the device will power off. I tried to charge it but when i plug in the charger the phone tries to turn on but kinda lags on the boot animation, it takes a really long time for it too boot up, but without the charger it turns on, gets to the pin entry screen and it turns off. I tried a few adapters, a few USB cables, even tried putting in the old battery but the same happens, I tried charging it form a PC, nothing. I got in the recovery, tried a reset, nothing. Please help. Do i need a new motherboard or what?
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