PG-1210 Service ManualSECTION 6. Equipment Repair Procedure6.1 No Power On with battery Applied.6.1.1 Power CHECK1.Check battery power : 3.5V~4.2V.Battery PackGndTerminal2. Check to see if C202.1 or C205 pin voltage is same with battery power : CP100VBATTGNDCP10018PANTECH