| Electronics > Repair |
| Help,Can ordinary LEDs replace thin-film LEDs? |
| << < (4/7) > >> |
| daisizhou:
--- Quote from: Phil1977 on August 18, 2024, 10:23:45 am ---I can't download the manual (registration required) but as I had a quick look over the datasheet pages, I wonder if it´s possible to reduce "V_pp" to let´s say 5V and connect LEDs to the outputs. The max current of 0.5mA is not very much, but may be sufficient for a bright display. You could test it with a few wired LEDs that get patched to the headers. --- End quote --- Do you want me to connect and test as shown below? |
| daisizhou:
I appreciate your help, thanks :-+ |
| Phil1977:
I you could lift up pin 7 of IC U7, then you would disable the step-up-converter of the EL-driver and the output voltage VD should be slightly below 5V. The EL-driver-ICs supply AC to the segments, but it seems it´s just the VD-voltage switched on/off. I can't see any reason this would harm the LEDs. Does anyone see a reason not to try it? I hope the OP is aware that placing and routing >140LEDs according to a given schematics is quite a lot of work :-\ --- Quote --- Do you want me to connect and test as shown below? --- End quote --- No, don't connect the LED directly to the VD-supply of the device. I´d reduce the VD from 50V to 5V and then connect a few test LEDs to the outputs of the driver IC instead of the EL-display. Sorry some edit was flawed. Now quotes and content should be okay again. |
| squadchannel:
I think everyone is mistaken. From the video of it working below, I believe it is an LCD. And HV6506PJ is an LCD driver. I think it needs to be replaced by a shift register with a 32-pin output. |
| daisizhou:
--- Quote from: Phil1977 on August 18, 2024, 10:56:23 am ---I you could lift up pin 7 of IC U7, then you would disable the step-up-converter of the EL-driver and the output voltage VD should be slightly below 5V. The EL-driver-ICs supply AC to the segments, but it seems it´s just the VD-voltage switched on/off. I can't see any reason this would harm the LEDs. Does anyone see a reason not to try it? I hope the OP is aware that placing and routing >140LEDs according to a given schematics is quite a lot of work :-\ --- Quote --- If you need a test I can do it. 140 LEDs using SMD 0603 packaged LEDs may be feasible,But the premise is that such a plan is feasible Do you want me to connect and test as shown below? --- End quote --- No, don't connect the LED directly to the VD-supply of the device. I´d reduce the VD from 50V to 5V and then connect a few test LEDs to the outputs of the driver IC instead of the EL-display. Sorry some edit was flawed. Now quotes and content should be okay again. --- End quote --- |
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