If you're doing repair a lot, a "known good housing" is invaluable for troubleshooting. In a no power iPhone, you need to differentiate No Charge from No Boot. Inspect for water damage.
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If the phone won't charge with a known good battery and a known good dock, then consider U2 chip failure on the board.
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If the phone will boot but won't charge with a known good battery and a known good dock, then consider U2 chip failure on the board.
If you're doing repair a lot, a "known good housing" is invaluable for troubleshooting. In a no power iPhone, you need to differentiate No Charge from No Boot. Inspect for water damage.
If the phone won't charge with a known good battery and a known good dock, then consider U2 chip failure on the board.