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Old 18th April 2012, 01:05 PM   #5801
tvicol is offline tvicol  Romania
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Quote:
Originally Posted by TheGimp View Post
So we should be able to use drivers to interface to other displays. Great. Is that an LCD display?
Well, things are not so simple.
As I previously said, this is a multiplexed LCD display. This have nothing to do with a static LCD display where you can, indeed, use drivers to interface with almost any other display.

In order to prolong LCD life and avoid electrolysis, an alternative stepped signal with multiple bias voltage level points is used to drive this type of LCD.
The selected segment will be in ON state al 0V but also on Vcc (3V or 5V depending on operation).
You can read more here Multiplexing and Bias of LCD Technology

Regards,
Tibi
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Last edited by tvicol; 18th April 2012 at 01:30 PM.
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Old 18th April 2012, 01:11 PM   #5802
tvicol is offline tvicol  Romania
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A display which may be used is FE0204M, at page 3-8.

Tibi
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Old 18th April 2012, 01:26 PM   #5803
TheGimp is offline TheGimp  United States
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Yes, I was thinking it was only a multiplexed LCD and it would be possible to detect the low on the com1,2,3 lines as interrupts and then look at the s1-6 lines to determine which segment was on. Build a map and use a look-up table to translate to digits which could then be used to drive any display system. Lots of grunge work, but should be possible since the refresh rate of the display is low compared to the speed of processors.

The multiple level voltage to the Com and S lines complicates things.

I wonder if a com line could be buffered and rc filtered then run through a comparator to determine which way it was biased? Then only sample when it were biased under one condition.

This might result in unacceptable delay in decoding the display though.

It would certainly be easier to use a commercial product.

Last edited by TheGimp; 18th April 2012 at 01:30 PM.
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Old 18th April 2012, 02:00 PM   #5804
TheGimp is offline TheGimp  United States
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Does the Shiga use negative voltage drive, or does it use 0-5V?

There is nothing in the LC78601E document to tell for sure since no waveforms are shown, but there are no charge pump caps so I suspect 0-5V. That rules out the lower two waveforms.

Pin 40 is "LCD drive bias 1/2 Vdd monitor. This implies possible symmetrical operation around Vdd/2.

Last edited by TheGimp; 18th April 2012 at 02:03 PM.
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Old 18th April 2012, 02:39 PM   #5805
tvicol is offline tvicol  Romania
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Quote:
Originally Posted by TheGimp View Post
Does the Shiga use negative voltage drive, or does it use 0-5V?

There is nothing in the LC78601E document to tell for sure since no waveforms are shown, but there are no charge pump caps so I suspect 0-5V. That rules out the lower two waveforms.

Pin 40 is "LCD drive bias 1/2 Vdd monitor. This implies possible symmetrical operation around Vdd/2.
Shiga use 0-5V and works in three steps:
0V - ON
2.5V - OFF
5V - ON
You can chk with a scope.
The number of bias voltage level points is in direct relation with the number of digits.
In our case the display is in OFF state at 2.5V.

Regards,
Tibi
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Old 18th April 2012, 04:23 PM   #5806
TheGimp is offline TheGimp  United States
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Thank you Tibi.

If a compatible display is available I'll go with it at first. Then, possibly look at an interface after I get everything working.

Respectfully,

Steven
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Old 25th April 2012, 10:45 AM   #5807
tvicol is offline tvicol  Romania
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A small update to this project.

Im in contact with several LCD manufacturers in order to make a custom LCD who meet LC78601 specifications.

Regards,
Tibi
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Old 28th April 2012, 05:38 PM   #5808
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Today arrived the longer flex ribbon cables. The mechanism is replaced by a new one. So i connect the 6 wires to my motherboard with the new mechanism.
So i flip the switch and press the play button.... nothing..damn..
So i pull a new board from a spare jvc boombox and solder all required connections to my new board...finally it spins without any problems.
The problem is in the motherboard, but where?
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Old 28th April 2012, 06:00 PM   #5809
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There is only one important point to note.

The laser as supplied new has a solder link in place to protect the it from static electricity damage.
You need to remove this small link with a soldering iron or sharp knife.
This is shown in the last picture of this listing.
It is to the left of the connector on the laser.

Quote:
The problem is in the motherboard, but where?
You told us: The mechanism is replaced by a new one ... Why a new board from a spare jvc boombox?

Rudy
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Last edited by BMW850; 28th April 2012 at 06:02 PM. Reason: Picture
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Old 28th April 2012, 06:18 PM   #5810
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Hi Rudy,

The problem was this:

Quote:
Originally Posted by Magura456 View Post
Hi, I have a problem with my shigaclone.
If I try to play a cd, the player does not respond.
This is on the remote control and the control with the display.
If I close the switch, turns the cd neat and sees the numbers.
Only when I push the play button nothing happens. What can be the cause? Laser or print?

Regards,

Matthijs
So today i replaced the mechanism with a new mechanism to check if the problems come from the mechanism. But it still i have the same problems.So i put a new board to it and it works fine now.

And yes i removed the solder blob before playing.

Matthijs
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