Hi. I have AMP-50 which work perfect put there is no light on display. There is three regulators for voltage 7805, 7808,7908. On 7805 i have 7.1, on 7808 i have 11.71v, on 7908 i have -12.04v . I see on the display everything but not light. Any suggestion?
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Tangent Amp - problem with display
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Re: Tangent Amp - problem with display
Those voltages are weird. Please verify you are measuring from the incorrect ground point and that your multimeter has a fresh battery.
Also, please upload some photos of the amplifier, especially the circuitry around the display section!"Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHorn
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Re: Tangent Amp - problem with display
I found this link http://www.ziva-vatra.com/index.php?...d=SGFyZHdhcmU=
It looks like it is an lcd with the light source from the side, I suspect its one of those sheets that light up behind the displayLast edited by R_J; 08-15-2017, 10:15 PM.
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Re: Tangent Amp - problem with display
pull the display assembly out and show foto's
i know the pdf says "VFD", but it's clearly not - it's a self-contained display module with it's own driver circuits in it.
infact looking at the schematic i wouldnt be surprised if it's an LCD with a Hitachi parallel interface.
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Re: Tangent Amp - problem with display
This is my display. I thing this is perfect to replace. But i don't know where is the problem..., on backlight or some circuit https://www.aliexpress.com/item/1602...2-515552f21762Last edited by coojoe_213; 08-16-2017, 06:47 AM.
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Re: Tangent Amp - problem with display
Did you check to see if there is any voltage to the backlight terminals in the display, thats the 2 leads going to the white piece. I don't know what the source of light is, I suspect it is one or two white led
I know the link I posted had a different problem, I posted the link because it had pictures of the display and showed the white backlight on the side.Last edited by R_J; 08-16-2017, 07:43 AM.
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