iMAX B6 Charger Repair | CONNECTION BREAK | How to repair iMAX B6 Charger.
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2H3LL (N-channel Mosfet) VDSS : 30V, RDS(ON) : 10mΩ, ID : 12A
AO4468 (N-channel Mosfet) VDSS : 30V, RDS(ON) : 14mΩ, ID : 11.6A
IRF7413 (N-channel Mosfet) VDSS : 30V, RDS(ON) : 11mΩ, ID : 12A
4920N (N-channel Dual Mosfet) VDSS : 30V, RDS(ON) : 18mΩ, ID : 8.2A
CONNECTION BREAK fix
00:00:00:00 00:00:08:27 Hello~~ Today I will repair the IMAX B6 charger.
00:00:11:00 00:00:19:27 If you try to charge the battery without the battery installed, a message is displayed with a warning sound.
00:00:20:26 00:00:29:23 For this reason, check the battery connection cable.
00:00:46:04 00:01:10:04 If the cable is normal but "CONNECTION BREAK" is still output, there is a problem inside the charger.
00:01:24:25 00:01:29:18 Unscrew the 8 screws on both sides.
00:02:00:14 00:02:04:17 Remove the 4 buttons of the operating switch.
00:02:47:16 00:02:55:27 Remove the 3 screws securing the PCB.
00:03:15:22 00:03:24:19 Check the bottom of the case, which acts as a heatsink.
00:03:31:16 00:03:40:13 This is because if the bottom and the MOSFET are in direct contact, they can receive damage from the outside.
00:03:42:04 00:03:51:01 I checked the Schottky Diode and MOSFET and they were fine.
00:03:54:07 00:04:03:06 No damage was visible on the surface of any part.
00:04:05:17 00:04:14:14 "CONNECTION BREAK" error code is most likely a problem with the battery output part..
00:04:18:15 00:04:26:20 I checked the datasheet and confirmed that the 12H3LL is a MOSFET. Let's check.
00:04:42:21 00:04:54:16 GATE and SOURCE are shorted to each other.
00:04:56:23 00:05:08:20 I'm going to replace the MOSFET.
00:05:18:02 00:05:26:29 Removing the resistor makes it easier to swap out the MOSFET.
00:06:34:22 00:06:42:15 I used a 4920N mosfet from an old lcd inverter.
00:06:43:21 00:06:52:18 Because I didn't have the 12H3LL, nor the replacement parts IRF7413 or AO4468.
00:06:58:09 00:07:08:19 However, the circuit needs to be modified to use the 4920N.
00:09:06:02 00:09:32:10 Connect jumper wires.
00:10:06:04 00:10:23:19 Restore the resistor that was removed.
00:10:30:13 00:10:39:09 The parts replacement is complete, and I will assemble in the reverse order of disassembly..
00:11:44:10 00:11:55:02 It's done, let's test it.
00:12:35:02 00:12:45:24 It's working fine past the point where the error was displayed.
00:12:52:04 00:12:59:13 Today's video will end here.
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