Dark Display Control Panel

[MWALA]

I have a canon ir 3235 with a display panel thats dark one side than the other.
if you try to lighten it wont be bright enough.
how do i solve this problem.

[Brian8506]

You could replace the display but before doing that, check the interface board that the lcd plugs into. I had one burn up and the 1st symptom was half the panel going light. Part # is FM4-6690

[Canuck]

Yupper...that'll fix it. Inverter pcb. Make sure the jumper on the new board is in the correct position. There are 2 types of LCD displays. If its blank after installing it,move the jumper

[MWALA]

Yupper...that'll fix it. Inverter pcb. Make sure the jumper on the new board is in the correct position. There are 2 types of LCD displays. If its blank after installing it,move the jumper

In this case the machine has done 155k copies and it was never opened

[MWALA]

In this case the machine has done 155k copies and it was never opened

I mean the display panel was never opened

[Brian8506]

Copy count doesn't make a difference here. The one I had go was in the low 100k"s and I have others with 600-700k that have never had to be changed.

[teckat]

as noted by Canuck----------

The new style LCD Inverter PCB (Part Number FM4-6690-010) now has a jumper, JP4, on it. Also, there may be one of two different style LCD's in the machine, each with a different style connector to the Inverter PCB. There are two positions for jumper JP4 depending on which LCD you have.

If the LCD Display's connector plugs into J2 on the LCD Inverter PCB, the jumper for JP4 should be positioned all the way to the left for the LCD Display to work properly. Please refer to the picture below:


If the LCD Display's connector plugs into J3 on the LCD Inverter PCB, the jumper for JP4 should be positioned all the way to the right for the LCD Display to work properly. Please refer to the picture below.

[gcsbkk]

basic problem of this model

[MWALA]

this is how my inverter board looks like. Please check C8 and C9. can you advise if something is wrong there.Arent there supposed to be 2 blue capacotors.

[dragstar]

On ir 3235 the display is pretty dark, but still see everything, but difficult, everything works OK, even the potentiometer has a little effect on the intensity of "lightness",i tried replacing the entire control panel (from other machine ir 3225),as well as the inverter PWB, but the problem remained the same, whether the solution could be a new Main Controller PWB ??????