Electronics > Repair
Help,Can ordinary LEDs replace thin-film LEDs?
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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