crwdns2933803:01crwdne2933803:0
crwdns2933797:0Liam Kandellcrwdnd2933797:0crwdne2933797:0
crwdns2936043:0crwdne2936043:0 crwdns2933505:0crwdne2933505:0 Liam Kandell
- crwdns2933769:0crwdne2933769:0
- crwdns2933771:0crwdne2933771:0
- crwdns2933801:0crwdne2933801:0
crwdns2933807:0crwdne2933807:0
| [title] Replace IC | |
| - | [* black] On the main PCB with the power |
| + | [* black] On the main PCB with the power jack, replace the MTX2410 switchmode regulator IC (SO-8 Package). |
| [* black] There is a pin-compatible device from Quorvo (ACT4060ASH-T) which has a different internal voltage reference but otherwise works fine. Only a resistor must be changed for this to work. | |
| - | [* icon_caution] Warning: I just encountered a problem with the ACT4060. It blew up on one lamp and damaged the LEDs as well. So it |
| - | [* black] |
| + | [* icon_caution] Warning: I just encountered a problem with the ACT4060. It blew up on one lamp and damaged the LEDs as well. So it seems not a perfect replacement after all. |
| + | [* black] The feedback Voltage for MXT2410 is 1.222V, for ACT4060 is 1.293V, so voltage divider on Pin5 must be changed accordingly. |
| [* black] One can best adjust R4+R3 (series). Remove R4, measure R3 and R4, and increase. It should measure about 10.67kOhm (R3 plus R4), and it can be slightly increased to 11.51kOhm. So basically add 1kOhm to R3+R4. |