LCD problem

MIDIbox SID
1

HI

I’ve purchased a red on black LCD 20x4 rt204-1 (version 2)

Anode and Kathode of backlight are mirrored (not on the datasheet)

so i’ve got the backlight ok now

in 4bit mode no letter just two line (line 1 and line 3) it seems like freezed

:whistle:

the application works great in background…

after a test on the second core J15 ; the display tell me MIOS version and the ID number

so it’s not the lcd

so i’ve test the main core on the second slave socket and the lcd work with mb sid application… i’ve redo all solder points and they are good…

no LCD :pinch:

so with the multimeter I’ve test all the LCD points to core

R/W was shorted to ground …the solder was good . i think this is a bad pad

thanks to the cutter!

now it works… :sorcerer:

when i press the sync button the LCD switch to bpm menu but the dedicated led doesn’t illuminate.

is it normal? :whistle:

2

when i press the sync button the LCD switch to bpm menu but the dedicated led doesn’t illuminate.

is it normal? :whistle:

Yes, its normal.

A small code part from the setup_mb6582.asm file, last revision :

;;DOUT_ENTRY CS_MENU_MODE, 0, 16+1, 3 ; Sync LED **new**

DOUT_ENTRY CS_MENU_MODE, 1, 16+1, 2 ; CC LED

DOUT_ENTRY CS_MENU_MODE, 4, 16+1, 1 ; Edit LED

DOUT_ENTRY TMP5, 6, 16+1, 0 ; Play LED **new**

Why Sync led is not active by default? I do not know.

Regards,

Janis

3

OK!!! thanks Janis :thumbsup:

Regards