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Trouble with LCD+ backlight - Edwin Cini - Jul 31 2:13:00 2001
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I have an LCD+ module and am having problems with the backlight. Apparently there is a trouble with the driver transistor on the controller board. Is a schematic of the LCD+ available? I looked on the net and on the driver CD, but with no luck. What is the type of SMD transistor driving the 2SD2012? I have a suspect that it's the culprit... A little guidance in the right direction would be greatly appreciated! Cheers! Edwin |
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Re: Trouble with LCD+ backlight - Dan Bielecki - Jul 31 20:11:00 2001
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I use an LCD+...no problems what-so-ever!!!. Lets make sure its not software and configuration first...before hardware. First...Is the problem you experience the backlight turning off at inappropriate times? Check the configuration bit for the keypad. There is a bit that says that the backlight automatically shuts off after 4 seconds. If you are not using that feature, set the bit correctly..even if a keypad is not attached. Second...The backlight is controlled by two settings....On/Off and Brightness level. Be sure you have set both to the proper settings. Set the level to 255 and the Backlit to ON. The light will enable. Then, depending on the keypad bit...may turn off after 4 seconds. Hope this helps!! .db. -----Original Message----- From: Edwin Cini [mailto:] Sent: Tuesday, July 31, 2001 12:13 AM To: Subject: [BasicX] Trouble with LCD+ backlight I have an LCD+ module and am having problems with the backlight. Apparently there is a trouble with the driver transistor on the controller board. Is a schematic of the LCD+ available? I looked on the net and on the driver CD, but with no luck. What is the type of SMD transistor driving the 2SD2012? I have a suspect that it's the culprit... A little guidance in the right direction would be greatly appreciated! Cheers! Edwin Yahoo! Groups Sponsor |
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Re: Trouble with LCD+ backlight - Neil Jepsen - Jul 31 20:52:00 2001
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I've had the same problem with a backlight. Also the 4 seconds is actually 16 secs. neil Dan Bielecki wrote: > I use an LCD+...no problems what-so-ever!!!. Lets make sure its not > software and configuration first...before hardware. > > First...Is the problem you experience the backlight turning off at > inappropriate times? Check the configuration bit for the keypad. > There is > a bit that says that the backlight automatically shuts off after 4 > seconds. > If you are not using that feature, set the bit correctly..even if a > keypad > is not attached. > > Second...The backlight is controlled by two settings....On/Off and > Brightness level. Be sure you have set both to the proper settings. > Set > the level to 255 and the Backlit to ON. The light will enable. Then, > > depending on the keypad bit...may turn off after 4 seconds. > > Hope this helps!! > > .db. > -----Original Message----- > From: Edwin Cini [mailto:] > Sent: Tuesday, July 31, 2001 12:13 AM > To: > Subject: [BasicX] Trouble with LCD+ backlight > I have an LCD+ module and am having problems with the backlight. > Apparently there is a trouble with the driver transistor on the > controller board. > > Is a schematic of the LCD+ available? I looked on the net and on the > driver CD, but with no luck. What is the type of SMD transistor > driving the 2SD2012? I have a suspect that it's the culprit... > > A little guidance in the right direction would be greatly appreciated! > > Cheers! > > Edwin > Yahoo! Groups Sponsor > > > Yahoo! Groups Sponsor [Image] > > |
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Re: Trouble with LCD+ backlight - Dan Bielecki - Aug 1 0:22:00 2001
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LCD+ Manual, Page 5, Table 1, Bit 4, 1 = Auto Backlight - Turns on
backlight with any key press and off 4 seconds after last key press. I just config the bit to zero. I personally dont care for the auto feature and maintain backlight control in logic using LCD+ instructions. I use it as a prompt indication. If the light is on...the software wants a response or action unless the user has an override on or off. The override then takes precedence. Is it really 16 seconds? Ive never timed it ! Thanks for the insight, Neil. .db. -----Original Message----- From: Neil Jepsen [mailto:] Sent: Tuesday, July 31, 2001 6:52 PM To: Subject: Re: [BasicX] Trouble with LCD+ backlight I've had the same problem with a backlight. Also the 4 seconds is actually 16 secs. neil Dan Bielecki wrote: > I use an LCD+...no problems what-so-ever!!!. Lets make sure its not > software and configuration first...before hardware. > > First...Is the problem you experience the backlight turning off at > inappropriate times? Check the configuration bit for the keypad. > There is > a bit that says that the backlight automatically shuts off after 4 > seconds. > If you are not using that feature, set the bit correctly..even if a > keypad > is not attached. > > Second...The backlight is controlled by two settings....On/Off and > Brightness level. Be sure you have set both to the proper settings. > Set > the level to 255 and the Backlit to ON. The light will enable. Then, > > depending on the keypad bit...may turn off after 4 seconds. > > Hope this helps!! > > .db. > -----Original Message----- > From: Edwin Cini [mailto:] > Sent: Tuesday, July 31, 2001 12:13 AM > To: > Subject: [BasicX] Trouble with LCD+ backlight > I have an LCD+ module and am having problems with the backlight. > Apparently there is a trouble with the driver transistor on the > controller board. > > Is a schematic of the LCD+ available? I looked on the net and on the > driver CD, but with no luck. What is the type of SMD transistor > driving the 2SD2012? I have a suspect that it's the culprit... > > A little guidance in the right direction would be greatly appreciated! > > Cheers! > > Edwin > Yahoo! Groups Sponsor > > > Yahoo! Groups Sponsor [Image] > > Yahoo! Groups Sponsor |
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Re: Trouble with LCD+ backlight - Edwin Cini - Aug 1 3:18:00 2001
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Unfortunately, I'm afraid that I've got a hardware problem... At power-on, by default, the LCD+ is always initalized with backlight on. Now, it's no longer lighting up at all. I just get the usual 9600, etc, etc message and no light. The other LCD functions are still working fine for me... The autobacklight feature does indeed take a LOT longer that 4 seconds to switch off... or well, it used to, until the light went off :-( I know I can cheat and have the light on all the time by tying the backlight cathode terminal to ground, but knowing that something has failed is a bit unnerving...and after all that would not be a real solution. Cheers! Edwin |
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Re: Trouble with LCD+ backlight - Edwin Cini - Aug 12 18:29:00 2001
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The backlight is working again now. A mains spike was all it took to get it back to work. |
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