Quick-jack board working without battery

Discussion created by lpcware Employee on Jun 15, 2016
Content originally posted in LPCWare by changwoo Ryu on Fri Aug 08 02:06:29 MST 2014
Hi everyone.

Last week, I received quick-jack board.
Then I connected it with my SmartPhone and I checked that working is no problem.
But, When I working it without coin battery, It doesn't work.
Of course, I checked jumper setting, (about jumpers setting, use as default, just remove the coin battery and check the smartphone's volume is max)
When I check the voltage of LDO(LD6806TD), it rise only 1.2 V.
Does it working without coin battery? or need to coin battery anytime?
Or Which point should I check more?
Please help me.

Thank you.