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I was very surprised when I connected the Philips CD-i 220 to my NAD Hi-Fi amplifier.
A buzz sound can be heard when I pump up the volume a little.
It's very annoying. I thought that CDi220 as a Philips Matchline Component could be a nice CD player.
I tryed also with my CDi 210 and it's the same
The players are connected with shielded SCART RGB Câble to modern LCD TV (so no noise from CRT).
I didn't have noise with CDi 470.
Maybe something is wrong with these two old machines. Do you think aged capacitors or something like this need to be fixed ?
The buzz (or hum) can be heared also though the headphones plug. I don't think its ground loop (but not sure).
This noise come from video circuit as it changes by pictures displayed.
It doesn't come from LCD TV set as other sources (PlayStation2, VHS recorder...) don't have this noise.
Posted : 16/10/2019 10:50 am
Does the hum go away when you unplug the SCART cable? (try operating it with composite video only)
Posted : 16/10/2019 11:51 am
It also can be an humidity issue.
Posted : 16/10/2019 6:29 pm
Topic starter
The hum doesn't change with SCART in or removed.
With the headphone plug into CDi-220, I can heard the hum with volume near the max; I use a 55 ohms headphones so even with volume to the max, the overall sound is not too loud.
The hum is not audible on the TV Set when the picture is black (for exemple on Philips Media Interactive intro).
The hum is audible on the CDI Menu. The hum is at its max when the screen is white.
The hum seems louder on the TV Set than by headphones.
Posted : 19/10/2019 11:15 am
Too bad, this is usually caused by cheap SCART cables.
(Even when they are double-shielded on the outside; as long as the inner video and audio cores are not separately shielded, bright pictures will add a layer of noise over the audio).
(Even when they are double-shielded on the outside; as long as the inner video and audio cores are not separately shielded, bright pictures will add a layer of noise over the audio).
Which player models do you use (CDI220/xx and CDI210/yy)?
I'll check if I have those models too and if they show similar problems.
I'll check if I have those models too and if they show similar problems.
Posted : 19/10/2019 6:29 pm
Topic starter
Test 1: the CDi Player is just powered on with video not connected - Audio connected with Monster Cable iTV Link Stereo audio câble to NAD Stereo Integrated Amplifier C 316BEE
note : 25% of power is a normal level of listening, 50% of power is loud.
Philips CDi 210/60
Hum can't be hear at 25% even at 10 cm of speaker, can be heard at 50% of power at 30 cm of speaker, can be heard at full power at 80 cm of speaker. Hum is light, not loud.
Philips CDi 220/00
Hum at 25% of power, also at 50% (audible at 4 meters like CDi 210 at 30 cm), hum at full power cleary audible at 10 meters with also a light pulsating tick.
Philips CDi 470/20
No hum - only noise at full power.
Concerning the CDi 220/00, the overall hum during the test is lighter than the hum heard through Panasonic LCD TV.
Test 2 : the CDi 220/00 is connected to Panasonic TV with a high quality SCART Câble.
First : through the Vivanco SBX95SE AV Control 4 SCART Switch : hum a clearly audible with normal volume. It's louder than hum coming from the amplifier.
Second : with direct scart connection to TV : hum is very light, not audible if you don't try to listen to it, same as hum coming from the amplifier.
So, the SCART switch is adding noise but only for Philips CDi.
I will investigate more.
Edit :
I replaced the automatic switch Vivanco SBX95SE by a manual switch Vivanco SBX94SE and the hum is not amplified any more. It's now like direct connection.
Posted : 20/10/2019 10:57 am
So, there is always a light background hum on the RGB-SCART enabled players, that gets amplified by the SCART switch?
The CDI220/00 is a first generation player with Mini MMC mainboard. I had this model once but sold it some time ago. Can't remember if it ever had background hum.
The CDI210/60 and CDI470/20 both have the last generation Movo IV mainboard. Different components and can't be compared to the Mini MMC board. I'll have to check if I still have one of these late CDI210 laying around, but I doubt it.
Posted : 21/10/2019 11:16 am
Topic starter
The automatic SCART switch is a full automatic electronic switch. Maybe it has some signal amplifier for no signal loss.
Posted : 21/10/2019 12:40 pm
Posted : 16/01/2020 11:49 pm