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Forum Index : Microcontroller and PC projects : LCD Panel Help Needed

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hkoetz
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Joined: 30/03/2019
Location: Netherlands
Posts: 19
Posted: 12:47pm 14 Dec 2019
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I have a Micromite Extreme 144, an EastRising LCD panel (8080 interface, 5 V power supply) and an adapter board from Rictech (see photos). The screen seems
to be totally dead. The options set are shown in one of the photos below. What am I doing wrong? There is 4.8 V between pins 1 and 2 on the panels interface.
 
matherp
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Joined: 11/12/2012
Location: United Kingdom
Posts: 10573
Posted: 06:20pm 14 Dec 2019
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Option lcdpanel SSD1963_8_16,l,,142


you need to specify the RD pin
Edited 2019-12-15 04:21 by matherp
 
hkoetz
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Joined: 30/03/2019
Location: Netherlands
Posts: 19
Posted: 10:19am 15 Dec 2019
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  matherp said  
Option lcdpanel SSD1963_8_16,l,,142


you need to specify the RD pin


Thanks for the answer, but that doesn't work either.
 
matherp
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Location: United Kingdom
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Posted: 03:38pm 15 Dec 2019
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How much power is it drawing? Sounds like the backlight isn't on. Try the following and post the result.

pixel 10,10,rgb(&F0,&F0,&F0)
? hex$(pixel(10,10))

Edited 2019-12-16 01:38 by matherp
 
Rodgerg
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Joined: 13/10/2019
Location: New Zealand
Posts: 12
Posted: 08:04am 16 Dec 2019
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Have you checked the selection of J3/J4 on the EastRising LCD panel?

Looking at the photo, the brightness control is selected for external input (J4 closed/ J3 open). It comes with J4 closed by default.

Not sure about MMX, but with ARMmite H7, I think we use the SSD1963 control, rather than external PWM signal.

Matherp may be able to confirm whether this is a possible cause of your problem.
 
hkoetz
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Joined: 30/03/2019
Location: Netherlands
Posts: 19
Posted: 10:47am 16 Dec 2019
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  matherp said  How much power is it drawing? Sounds like the backlight isn't on. Try the following and post the result.

pixel 10,10,rgb(&F0,&F0,&F0)
? hex$(pixel(10,10))


Not much power is drawn. The two regulators on board hardly get warm. The results of you test is displayed below. On the LCD screen nothing happens.
 
hkoetz
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Location: Netherlands
Posts: 19
Posted: 10:52am 16 Dec 2019
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  Rodgerg said  Have you checked the selection of J3/J4 on the EastRising LCD panel?

Looking at the photo, the brightness control is selected for external input (J4 closed/ J3 open). It comes with J4 closed by default.

Not sure about MMX, but with ARMmite H7, I think we use the SSD1963 control, rather than external PWM signal.

Matherp may be able to confirm whether this is a possible cause of your problem.


The backlight setting (SSD1963) seems to be Ok according to the documentation.
 
CaptainBoing

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Joined: 07/09/2016
Location: United Kingdom
Posts: 2171
Posted: 02:13pm 16 Dec 2019
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  matherp said  How much power is it drawing? Sounds like the backlight isn't on. Try the following and post the result.

pixel 10,10,rgb(&F0,&F0,&F0)
? hex$(pixel(10,10))


pixel 10,10,rgb(&hF0,&hF0,&hF0) surely?
 
Rodgerg
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Location: New Zealand
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Posted: 08:32am 17 Dec 2019
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Hmm.....

Very interesting.

The version of the manual I downloaded shows exactly the opposite settings for J3 & J4 as below



I downloaded this from

https://usermanual.wiki/Document/ERTFTM0901Datasheet.600261355/html#pfc

The footer at the bottom of the page says the document version is Rev 1.0.

Since two versions of the manual seem to exist, which directly contradict one another, it may be worth just trying J3 Short, J4 Open to see if this fixes the problem. It won't do any damage to the device and would at least eliminate one possible cause.
 
matherp
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Location: United Kingdom
Posts: 10573
Posted: 08:36am 17 Dec 2019
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My display which works has J3 made and J4 open has per the manual and yes the test should have been :
pixel 10,10,rgb(&hF0,&hF0,&hF0)
 
hkoetz
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Joined: 30/03/2019
Location: Netherlands
Posts: 19
Posted: 11:21am 17 Dec 2019
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  matherp said  My display which works has J3 made and J4 open has per the manual and yes the test should have been :
pixel 10,10,rgb(&hF0,&hF0,&hF0)


Result of the new test




Will try the switch of J3/J4 later. Can't get in the mancave now (granddaughter is sleeping there).
 
matherp
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Posted: 12:48pm 17 Dec 2019
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That eliminates the backlight - the display controller isn't responding - Have you another display you can uses on the MMX to eliminate it from the equation?
 
hkoetz
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Joined: 30/03/2019
Location: Netherlands
Posts: 19
Posted: 06:35pm 17 Dec 2019
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  Rodgerg said  Hmm.....

Very interesting.

The version of the manual I downloaded shows exactly the opposite settings for J3 & J4 as below



I downloaded this from

https://usermanual.wiki/Document/ERTFTM0901Datasheet.600261355/html#pfc

The footer at the bottom of the page says the document version is Rev 1.0.

Since two versions of the manual seem to exist, which directly contradict one another, it may be worth just trying J3 Short, J4 Open to see if this fixes the problem. It won't do any damage to the device and would at least eliminate one possible cause.


That did the trick!
Many thanks everybody.  
 
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