Restoring faded VFD display, rejuvenating filament lines on Cambridge Audio DVD89 player

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A few years ago I bought for peanuts Cambridge Audio DVD89 player, because I've found out that it can be flashed with firmware allowing SACD-R reading. It's in excellent condition except faded VFD display, it was probably left powered on in standby for too long.
Anyway, I've read and read internet old wise man on VFDs (these are tubes actually!) and when I understood the principles I've decided to try to restore this faded display using 9V battery.
In this particular case it was not about dried capacitor or fried diode in filament power supply, as service diagrams show that power comes from dedicated transformer secondary wiring.
Filament has to be heated up to burn all the deposits from chemical reactions with impurities that took place during past 20 yrs.
The easiest way is to provide more than regular voltage and use current to burn the nasties.
REMEMBER to disconnect the display! You don't want 9V wandering around PCBs of your device!
Also, do not try this DIY if you did not understood this description!

Опубликовано:

2 окт 2024

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Комментарии : 19

@Dancopymus 7 месяцев назад

Hello HiFi Zone! Firstly, thanks for the video. I have a VFD, taken from a video cassette and the same (VFD) was working but, when I went to do the tests to find out the pins, the display didn't light up. However, when I touch the tips of the multimeter (continuity scale) to the filaments, the multimeter beeps. Do you think the VFD may have burned out even though the multimeter is beeping at the terminals? I applied 3.3V, 5V and even 9V to the filaments. Apparently, the threads (of the filaments) are intact. I would be very grateful if you could answer me.

@k4syx 7 месяцев назад

Hi! Check it again in the cassette player. If it works, then probably you got wrong pins or there was no contact with your voltage source (like some dirt on the contract point that worked like isolation or sth like that). If it doesn't work in cassette player, than maybe it did burn. You can try to look for filament as these are very thin, hair like wires and you can see if they look intact. That's what multimeter would also suggest. Or maybe you've had it under voltage too short?

@Dancopymus 7 месяцев назад

Hey friend. Thanks for the answer. Shortly afterwards, I took a closer look at the VFD and discovered that the nozzle, which is used to remove air from inside the VFD's glass tube (vacuum), had a small hole at the tip, thus letting air in. inside the tube. So, I ask you: is it possible to recover the VFD, using some type of glue to cover the small hole or, in some way, remove the air from the glass tube? What would you advise me? Thanks.@@k4syx

@k4syx 7 месяцев назад

@Dancopymus with air inside, filament will just burn, like it would happen with a bulb. I have no idea how could you be able to completely remove air from the inside:( And if you've provided voltage while there was air inside it can already be beyond repair :( Have you checked it in the player?

@nudebaboon4874 4 месяца назад

Good to know, thanks!👍

@just_DIY_r 4 месяца назад

Hello! Thank you very much! I just reborn VFD in my Pioneer PD-7700.

@Senerski 3 месяца назад

tried it on a sony tuner. So far works great! Any idea how long this lasts?

@k4syx 3 месяца назад

Couple of years, at least. Try to power off the tuner instead of putting it in standby mode, very often filament is powered in standby and that's the root cause. Use some kind of power strip with switch or something like Tuya remotely controlled plug.

@HDXFH Год назад

Good idea

@johnhenderson6407 9 месяцев назад

Too bad there wasn't a before the fix image/video.

@k4syx 9 месяцев назад

Yes, my bad. I've realized that it would be useful when I was half done :(

@johnhenderson6407 9 месяцев назад

Still a pretty good win. SACD-R with just a firmware update and 9V trick on the deposits. Congratulations!@@k4syx

@chamni63 2 месяца назад

How can I find + & -/ positiv negativ?

@k4syx 2 месяца назад

@@chamni63 should be described on the PCB, you may also trace the lines from power supply. And you can just check with your voltage meter if you have steady hands (so there will be no accidental shorts :) )

@chamni63 2 месяца назад

@@k4syx ok thanks.

@chamni63 2 месяца назад

@@k4syx the manual says FL board pins are named VDD/VFDP/FLAC5V1/FLM-GND/FLAC5V2/RST/SD02/SDI2/SCK2/CS2/SDT1/SCK1/CSI/S-GND I will try with a multimeter, have to buy one first😉

@k4syx Месяц назад

@@chamni63 flm-gnd looks like filament ground, so that's one, vfdp - maybe VFD positive? This one or vdd maybe.

@k4syx Месяц назад

@@chamni63 on the other hand if you have service manual, you can just trace them and check which one is right