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How to add a ground wire on the LED drivers:
How to Reduce Brightness - MS610UB-V3
Option 1
The simplest method would be limited LED output currents. There are 6 jumpers on MS610UB-V3.
From left to right J1P ~ JP6. Increasing the value of the resistor will reduce brightness level. For an Example: If you purchased LED kit Part number: UB54220LED5620X1+MS610UB
By default, JP2 shorted (1R5) on MS610UB-V3. If it is too bright. then removed solder on JP2, Shorted JP3(2R). It will be dimmer, or if it is still too bright, remove JP3 shorted JP4
Option 2
If your application needs to adjust brightness level during day and night time. You need to add a 5~10K Potentiometer as Shown photo below
LED Drivers Specification
MS456UB-V9
MS456UB-V8
MS456UB-V6
MS610UB-V0
MS610UB-V1
MS610UB-V2
MS610UB-V3
MS615UB-V0

How to Connect to LED Driver
MS610UB - LED kit that come with a custom wire adapter
MS610UB - LED kit that is ending with “DISENA”
MS610UB - LED kit that come with a 6 pin pigtails connector
MS456UB - LED kit that come with a custom wire adapter
MS456UB - LED kit that is ending with “DISENA”
MS456UB - LED kit that come with a 6 pin pigtails connector
MS615UB - LED kit that come with a custom wire adapter
MS615UB - LED kit that come with a 6 pin pigtails connector

Retrofit Monitor user guide
Retrofit Monitor included a wire adapter
Retrofit Monitor included a wire adapter - V2
Retrofit Monitor Universal

How-to's
How to Install LB Series LED Backlight Kit
How to Install UB Series LED Backlight Kit
How to Install XB Series LED Backlight Kit
How to use IT01
How to use IT02
How to use LST01
How to use LST04
How to use LST05
5 buttons KeyPCB for LCD controller
How to Identify Inverter's Pin Assignment
Old UB36 (PCB) Cross table