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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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How to check if LCD module is not dead with basic components like switches.
Hi there,
I found an old LCD module. I'm not sure if its working. Is there a simple method to check if the module is working (without connecting it to ,uc) , like using switches. Thanks in advance BO |
#2
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How to check if LCD module is not dead with basic components like switches.
wrote in message oups.com... Hi there, I found an old LCD module. I'm not sure if its working. Is there a simple method to check if the module is working (without connecting it to ,uc) , like using switches. Thanks in advance BO In general, no easy way. May have on-board test mode, but you need to know how to get into it. Arfa |
#3
Posted to sci.electronics.repair
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How to check if LCD module is not dead with basic components like switches.
wrote in message oups.com... Hi there, I found an old LCD module. I'm not sure if its working. Is there a simple method to check if the module is working (without connecting it to ,uc) , like using switches. Thanks in advance Well, I don't know exactly what your module is, exactly, but some of the older, 7 segment digital LCD's maybe with the addition of a dash, comma or decimal point could be checked with an old analog VOM. Put the VOM on one of the higher resistance ranges, and use the test leads as a voltage source to activate one segment at a time. One lead to the "back plane" and the other lead to the segment being checked. (can't remember now which polarity worked best..... won't hurt if you get it backwards first) If you hold the module to the light just right, you may be able to see which pin, land, or oxide plated area is connected to the segment you want to test. The "illumination" or polarization (?) won't be at full contrast, at all, and you may have to hold it at just the right angle to see it work, but work it does! And if there is any contrast change at all with applied voltage (with the correct polarity), there is a 99.99+% chance that segment is OK. Now, if it is a dot matrix LCD, this method may be not practical. Additionally, if it is a module with built-in driving transistors, this method will not work at all. Old Chief Lynn |
#4
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How to check if LCD module is not dead with basic components like switches.
wrote in message
oups.com... Hi there, I found an old LCD module. I'm not sure if its working. Is there a simple method to check if the module is working (without connecting it to ,uc) , like using switches. Thanks in advance BO There are a number of web sites that are dedicated to LCD modules and their uses. In general, your LCD module must go through a predetermined power on/reset initialization sequence before it can be brought to life. The initialization sequence has timing requirements that you will probably not be able to accomplish with manually actuated switches. Your best bet in this case would be to use the printer port on your computer to test the module. There are loads of software examples on the web that demonstrate this functionality -- Dave M MasonDG44 at comcast dot net (Just substitute the appropriate characters in the address) Never take a laxative and a sleeping pill at the same time!! |
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