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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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7 segment display with 4 digits
Hello everyone,
someone has the pinout of this four-digit display LFU-421-2003A 44A? The dsplay was dismounted from a VCR, I'd like to reuse it to build a clock or a timer-counter Thanks to all Hello Joseph |
#2
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7 segment display with 4 digits
RGR-74 wrote:
Hello everyone, someone has the pinout of this four-digit display LFU-421-2003A 44A? The dsplay was dismounted from a VCR, I'd like to reuse it to build a clock or a timer-counter Thanks to all Hello Joseph One approach would be to get a copy of the service manual or schematic for the VCR that the display came from. There, you can (maybe) see the hookups, voltages, etc. I say maybe because sometimes the schematics are just drawings and seem to be devoid of useful info. You'll have to take a chance that way. Best bet would be to visit Mouser.com or Digikey.com and search for LCD or VF displays that they stock. Most of those will have links to spec sheets that detail all the pertinent info you will need to build your clock. -- David masondg44 at comcast dot net |
#3
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7 segment display with 4 digits
On 18 Nov, 16:07, "Dave M" wrote:
RGR-74 wrote: Hello everyone, someone has the pinout of this four-digit display LFU-421-2003A 44A? The dsplay was dismounted from a VCR, I'd like to reuse it to build a clock or a timer-counter Thanks to all Hello Joseph One approach would be to get a copy of the service manual or schematic for the VCR that the display came from. *There, you can (maybe) see the hookups, voltages, etc. *I say maybe because sometimes the schematics are just drawings and seem to be devoid of useful info. *You'll have to take a chance that way. Best bet would be to visit Mouser.com or Digikey.com and search for LCD or VF displays that they stock. *Most of those will have links to spec sheets that detail all the pertinent info you will need to build your clock. -- David masondg44 at comcast dot net Thanks David I report an error in the code of the dis the exact code is: "LFU-4421-2003A 744A"; I have tried in every place, but without finding anything, the only thing I know is that is used in a videoregistarore of Funai, 29D861 model, unfortunately I no longer have it on video, where I dismounted, I've schematic (now no longer provides them nobody manufacturer). Is there anyone who can advise me on where I can find the wiring diagram of the VCR, which derive from the connections of the display? Thanks to all. Joseph |
#4
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7 segment display with 4 digits
On Thu, 19 Nov 2009 03:27:54 -0800 (PST), RGR-74
wrote: Is there anyone who can advise me on where I can find the wiring diagram of the VCR, which derive from the connections of the display? If 'net searches aren't working, then the next quickest way is to just pin it out yourself. The "high tech" approach would be to use a DMM with a diode test range and check successive pin pairs until you're able to determine which are the digit commons and which are the segments. It almost takes longer to describe than to do. Alternately, a "low tech" approach would be to grab a couple of AA (LR6) cells, a few bits of wire, and a small resistor in the range of, say, 150 to 330 ohms. Then probe around to see what lights up what. Note that even though it's a small resistor, you can't leave it out as it's needed to limit the current through the LED. 150 ohms will hit around 10 mA, which is probably the smallest you should use. Larger is better, up to maybe 1 Kohms (which will probably still allow enough current to see a segment). -- Rich Webb Norfolk, VA |
#5
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7 segment display with 4 digits
On Thu, 19 Nov 2009 03:27:54 -0800 (PST), RGR-74
put finger to keyboard and composed: the exact code is: "LFU-4421-2003A 744A"; I have tried in every place, but without finding anything, the only thing I know is that is used in a videoregistarore of Funai, 29D861 model ... ftp://funai.de/Public/VCR/Service_Ma...ice_Manual.pdf ftp://funai.de/Public - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |
#6
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7 segment display with 4 digits
On 19 Nov, 17:56, Franc Zabkar wrote:
On Thu, 19 Nov 2009 03:27:54 -0800 (PST), RGR-74 put finger to keyboard and composed: the exact code is: "LFU-4421-2003A 744A"; I have tried in every place, but without finding anything, the only thing I know is that is used in a videoregistarore of Funai, 29D861 model ... ftp://funai.de/Public/VCR/Service_Ma...G457ED)_Servic... ftp://funai.de/Public - Franc Zabkar -- Please remove one 'i' from my address when replying by email. Thanks Franc Zabkar, Your link was very useful in fact with the schematic I was able to get the pinout of the display. When the project is ready, we'll publish some photos directly on my website. Thanks to all. Joseph. |
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