Magicstomp box screen

[dgt603]

Could anyone please help as to where I could buy a new screen for my MS? the screen on my MS still light up but shows no info and no sound.

[godzilla]

Hi

I suggest you search this forum - I'm pretty sure there is a thread with loads of recommendations and advice on MS screen replacements. I'm not sure how a faulty screen could affect the sound, though - unless the common overheating problem has fried some other component. No doubt one of our real experts will respond later, but in the meantime try the search.

Cheers

Keith

[DaveC]

If the screen, or more importantly the screen-controller chip, fails (usually because of overheating) then the MagicStomp registers this during startup and refuses to proceed. That's probably why your screen illuminates but nothing else happens.

You'll need to source a replacement screen and chip from China, using the auction website that cannot be named. The screen and the chip come combined on a single daughter-board with 16 solder connections along the top edge.

Try to get a JHD162A Y/YG rather than anything from the later JHD1602 series because a 1602 may require extra resistors to control the contrast and the supply voltage.

Remove the old board and solder in the new board. It's not difficult but it's time-consuming. You will almost certainly need to alter the aperture in the top casing using a file.

In the past, a few people on this site have offered to carry out this fix -- but don't expect them to do it free. As I said, there's a lot of work involved!

Regards,
DaveC.

But, before you go any further, make sure you are using the correct power-supply! This is a common mistake.

[dgt603]

Hi DaveC,
Many thanks I just had a look on the auction website that cannot be named nothing there is it a Yamaha part? my power supply is the Yamaha one that came with the MS.
Regards,
Davegt.

[DaveC]

Hi Dave,

The JHD162A is a generic part: there were billions of them used in early printers and photocopiers. Nowadays they are frequently used as the basic visual interface for Arduino computers. Just type “JHD162A” into the search box.

The internal logic chip is no longer made and has been superseded. The new chip is part of the 1602. The 162 and 1602 look exactly the same and fit in the same space and to the same connections.

You will be able to get a 1602 in the UK (m-house, theme3000, RS etc.) but I doubt that you’ll find a 162 — they’ve all gone to landfill.

Regards,
DaveC.

[loujones12]

Hi Dave if thescreen lights up and the data is not showing almost cetainly needs a replacement. ive done both of mine. its a little tricky but if you are confident with a small soldering iron you can do it. also you will need to use some soldering wire tape to soak up solder as the pins are small and i think there are maybe 20 of them. then gengly pry off the board do not use a metal screwdriver to pry off. use a plastic or wood one. i have some new spare screens here. ill look for a number on them. also have quadraverb spares. they are easy to do. 5 mins.
the number for the display is 1602a make sure if you buy it has the A on the end. they are still available on the well known auction site. just do a search like 1602a LCD Screen. if you need more info or you want one post me..
regards Lou

[dgt603]

Hi,
Many many thanks to you all for your help I found this on the well know site would this be the right one?(1602A Blue LCD Module HD44780 16x2 Arduino Parallel Pi Serial I2C Flux Workshop)

Regards
Davegt

[DaveC]

Hi Dave,

That looks to be OK but I think you need the Yellow/Green, not the Blue.

DaveC.

[dgt603]

Hi All,
Green one on order I will keep you all posted and once again thank you all for help and all keep safe.

Regards
Davegt.

[DaveC]

Hi Dave,

If you want, when you are ready to start this, I'll write out everything you need to do and explain some of the problems you might face.

Let me know: I don't want to be teaching you to suck eggs .


Regards,
DaveC.

[dgt603]

Hi All,
Just got the screen fitted MS up and running I'm able to use it again only thing is the screen is to bright all I can see is two rows of 16 boxes and the info very very faint within each box in can just about read what patch I'm on just have to guess @ 75 the eyes are not as good as they use to be how can I adjust the contrast of the screen to dull to down?

Regards
Davegt.

[DaveC]

Hi Dave,

Pin 3 (VEE) controls the contrast. It is being fed something between 0V and +5V — whatever Yamaha decided was correct for the original 162 that they used — and you could lower this voltage by shunting it to Ground (pin 1 Vss) through a resistor. I believe this would decrease the contrast.

Pin 15 (LED+) controls the brightness of the backlight. The +5V supply could be lowered by shunting it to Ground (pin 16 LED-) through a resistor. I believe this would increase the contrast.

CAVEAT: Personally, I have never tried either of these mods. All my repairs used 162s , which worked first time. If anybody reading this has direct experience please “chip” in!

Regards,
DaveC.

Have you managed to refit the top?

[dgt603]

Hi Dave,
Sorry it has taken so long to get back to you ,health has not been the best(old age). The top/cover yes it went back on no trouble right back on the way it came off no modifications needed to be done to it. What I would like to know is what type/size of resister would I need and if possible would you have a diagram off crossing the pins.

Regards
Davegt.