Read JBL CHARGE 2 (serv.man2) Service Manual online
5-2 Trouble shooting Chart
USB port for external devices cannot be charged
USB port for external devices
cannot be charged
Go
No
Yes
Yes
No
Repair U4
Check 15pin FFC cable connect OK or not
Check the U4 (LM3481) of CN
board is work well or abnormal
Check the U2 (TPS2546) of CN
board is work well or abnormal
Connect well
Replace CN board or main board for
comparison.
Repair U2
No
Yes
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