Good morning calculator fans,
When I first turn my calculator on after it being off for a little while (I don't know specifically how long), the screen has missing elements. It is not always the same missing elements each time this happens, but it happens every time. Here's a video of a particularly bad example:
https://youtu.be/CDtlJYWs16s
Here, when turned on, the screen remained completely blank (my 'screensaver' image is deliberately blank when turned 'off'). You can see what happens with my key presses, a number reveals some of the screen elements, but not the bit at the top.
This has become such a nuisance (having to press a few buttons to see everything) that I've actually stopped using my DM42 now. Is this a known bug? Is there a fix?
DMCP v3.18
DM42 v 3.15
[DM42] Bug when turned on?
Re: [DM42] Bug when turned on?
Interference from the static caused by your hairs?
Greetings,
Massimo
ajcaton
-+×÷ left is right and right is wrong Casted in gold
Massimo
ajcaton
-+×÷ left is right and right is wrong Casted in gold
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- Posts: 564
- Joined: Mon Apr 24, 2017 8:38 pm
Re: [DM42] Bug when turned on?
If folk are running the same software and not having the same issues, does that make this a hardware issue?
Re: [DM42] Bug when turned on?
I don't see this here also not with a blanc off screen.
edit: With the 41X, that i use most, I had to do a few serious "paperclip of death" resets because of experiments, maybe its a good idea to do that and format also the FAT disk before concluding its the hardware.
edit: With the 41X, that i use most, I had to do a few serious "paperclip of death" resets because of experiments, maybe its a good idea to do that and format also the FAT disk before concluding its the hardware.
Last edited by EM41 on Thu Jun 04, 2020 9:51 pm, edited 1 time in total.
HP41C (2x), HP41CV, HP41CX, DM41X β, DM41X, DM42, HP11C, HP48G, HP97
- PierreMengisen
- Posts: 305
- Joined: Wed Nov 29, 2017 1:38 pm
- Location: Neuchâtel CH
Re: [DM42] Bug when turned on?
Is it the same behaviour when powered by USB?
Pierre
[TI59 with PC100C; TI-84 Plus CE-T; HP41CV with HP IL loop & 2*82161A DCD & 82162 TP; HP15C; HP28S; DM41; DM41L; DM42; DM41X]
[TI59 with PC100C; TI-84 Plus CE-T; HP41CV with HP IL loop & 2*82161A DCD & 82162 TP; HP15C; HP28S; DM41; DM41L; DM42; DM41X]
Re: [DM42] Bug when turned on?
You may have a faulty ribbon connector on the LCD. I had to replace my LCD screen as I was experiencing a very similar issue. I am pretty sure that my LCD ribbon was damaged due to me taking the calculator apart so many times to address the keyboard issues. Michael at SM was able to sell me the LCD only. I replaced it, and everything worked fine.keithdalby wrote: ↑Thu Jun 04, 2020 11:16 amWhen I first turn my calculator on after it being off for a little while (I don't know specifically how long), the screen has missing elements. It is not always the same missing elements each time this happens, but it happens every time. Here's a video of a particularly bad example:
-
- Posts: 564
- Joined: Mon Apr 24, 2017 8:38 pm
Re: [DM42] Bug when turned on?
Good suggestion. I've been doing some testing, and it only happens when battery powered. The battery meter on the calculator shows that it's fine any suggestions?
Re: [DM42] Bug when turned on?
What does 'fine' mean in volts? (I once thought this is a technical forum ... )keithdalby wrote: ↑Tue Jun 09, 2020 6:17 pmGood suggestion. I've been doing some testing, and it only happens when battery powered. The battery meter on the calculator shows that it's fine any suggestions?
WP43 SN00000, 34S, and 31S for obvious reasons; HP-35, 45, ..., 35S, 15CE, DM16L S/N# 00093, DM42β SN:00041
Re: [DM42] Bug when turned on?
Keith is a physics teacher. I'm sure he is able to ascertain what voltage range is "fine" himself.
There are only 10 kinds of people in the world: those who understand binary and those who do not.
Re: [DM42] Bug when turned on?
Maybe the voltage is fine, but not the capacity.
Greetings,
Massimo
ajcaton
-+×÷ left is right and right is wrong Casted in gold
Massimo
ajcaton
-+×÷ left is right and right is wrong Casted in gold