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Old 16th October 2012, 10:55 AM   #6361
lohk is offline lohk  Europe
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any news about the pucks?
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Old 16th October 2012, 01:05 PM   #6362
TheGimp is offline TheGimp  United States
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On a slightly more technical note, is there any way to adjust the contrast of the LCD display.

The first image is taken perpendicular to the screen, the second off at about a 15 degree angle.

When looking directly at the screen, the segments which are not active are still quite visible. It does not take being very far off perpendicular to the screen for the image to lose contrast completely.

The datasheet is not very helpful here.

Thanks.

Steven
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File Type: jpg LCD15Degree.JPG (99.6 KB, 464 views)
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Old 17th October 2012, 07:19 AM   #6363
tvicol is online now tvicol  Romania
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Steven,

Have attached few more screen shots from LCD datasheet.
As you can see from the first image, the operating voltage is between 4,5 and 5,1 V. That means we are running the LCD near to maximum. This is one reason for saturation. Yes, I know itīs my fault and it may considered as a design flaw.
The workaround:
- you may adjust the contrast by placing a resistor at LC78601 pin 40.Use a value between 500ohm and 2K2 or a pot.
- you may adjust the backlight by placing a 500ohm pot in P1 position.

Regards,
Tibi
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File Type: jpg VA_display_2.jpg (26.6 KB, 403 views)
File Type: jpg VA_display_3.jpg (12.2 KB, 396 views)
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Old 17th October 2012, 08:20 AM   #6364
tvicol is online now tvicol  Romania
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Quote:
Originally Posted by lohk View Post
any news about the pucks?

There have been two version for CD puck. One low cost using magnetic powder which didnīt worked as expected and one high cost using an Al nonmagnetic puck.
I expect to test Al nonmagnetic puck at the end of this week.

Regards,
Tibi
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Old 17th October 2012, 12:28 PM   #6365
TheGimp is offline TheGimp  United States
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Thank you for the information on the LCD.

Cut trace carrying V4 to Pin 40 (at pin 40). Insert a resistor (or 500R plus 2K pot in series) from V4 to Pin 40.

Because the resistor is in series with the voltage source it drops the voltage. Best to insure the bypass cap is located on the pin 40 side of the resistor.
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Old 17th October 2012, 01:09 PM   #6366
tvicol is online now tvicol  Romania
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Yep, thatīs the solution.
Thank you for drawing, Steven.

Regards,
Tibi
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Old 18th October 2012, 01:29 AM   #6367
TheGimp is offline TheGimp  United States
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Tibi,

That works great. Even in the third shot at over 45degrees it is still better than it was.

It actually looks best slightly off center.

Top image straight on.
Middle image at about a15 degree angle.
Bottom image at about a 45 degree angle.

I'll measure the value tomorrow and post it. I need to take it back to the solder station to fix it properly.
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Old 18th October 2012, 01:52 AM   #6368
j45yip is offline j45yip  Singapore
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Hi Tibi,

is the the workaround for the display done to all the mounted and tested shiga before they are shipped out?

thanks,
johari

Quote:
Originally Posted by tvicol View Post
Steven,

Have attached few more screen shots from LCD datasheet.
As you can see from the first image, the operating voltage is between 4,5 and 5,1 V. That means we are running the LCD near to maximum. This is one reason for saturation. Yes, I know itīs my fault and it may considered as a design flaw.
The workaround:
- you may adjust the contrast by placing a resistor at LC78601 pin 40.Use a value between 500ohm and 2K2 or a pot.
- you may adjust the backlight by placing a 500ohm pot in P1 position.

Regards,
Tibi
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Old 18th October 2012, 05:30 AM   #6369
danzup is offline danzup  Romania
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Quote:
Originally Posted by TheGimp View Post
Tibi,

That works great. Even in the third shot at over 45degrees it is still better than it was.

It actually looks best slightly off center.

Top image straight on.
Middle image at about a15 degree angle.
Bottom image at about a 45 degree angle.

I'll measure the value tomorrow and post it. I need to take it back to the solder station to fix it properly.
This LCD was designed in mind with a film filter in front by the color the user want (hence the white color for backlight) , but this little mod is the way to to be done for all Shiga 2012 from Vicol audio , in fact is the only way to set the contrast to the LCD.
@ The Gimp : best is to measure pot+resistor value and replace with a smd resistor on board , but I think you already intended to do so.
Best regards.
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Last edited by danzup; 18th October 2012 at 05:33 AM.
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Old 18th October 2012, 12:43 PM   #6370
TheGimp is offline TheGimp  United States
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Yes danzup, thanks.

I changed it to a 1.3K smd resistor today with a 0.1uF cap from pin 40 to pin 39 (gnd), and will retest tonight.

I will also use the pot in my other board when I have it finished (waiting on parts ) and see if I get about the same value.

Fortunately there is a via close to the pad and it is a simple fix to cut the trace from via to pad and insert a 0603 resistor (0805 works but is large).
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