Hi
Attached the schematic for your reference.
Connect to the USB of the computer to charge, R19, R21, R22 are not soldered. After connecting the USB, the PG output is low (green light is on) for more than 1 second, and the red light is off (STAT output is high), REGN, SYS, BAT There is no output voltage.
Soldering 5 boards, all the same problem, try to remove all other unnecessary devices on the periphery, it is still the same problem, the reason is not clear, I feel that the booster circuit does not start, or where the problem is detected during the startup process .
Switch a regulated power supply for charging, short-circuit D + and D-, and ILIM to GND.
Switch a regulated power supply for charging, short-circuit D + and D-, and ILIM to GND.
Connect the battery first, and then connect the regulated power supply. There is no response and the indicator is off.
Instead of connecting the regulated power supply first, the battery is not connected. The green light is always on and the red light flashes. Measure the voltage at the BAT terminal and jump around 5.4V. After connecting the battery, the red and green lights are off and there is still no charging. The battery voltage used in the test is 6.2V.
Please help check the schematic.
Thanks
Star
