Broken M-DAC ?
- Thread starter jwceltic
- Start date
misterdog
Not the canine kind
Maybe you have some inside information, considered opinon is that Lelon were supplied a bad batch of electrolyte.
Many large manufacturers have had problems with supplies of 'bad caps' including Samsung, Dell and others..
Andrew.B
pfm Member
nah, just that lelon are not considered a good brand anywhere, aside from electrolyte, but they are cheap. .
There is of course a certain bias in that having seen so many of their caps all dead, is because they are used so often to keep prices down in reasonably harsh environments like SMPS and areas with high ambient temps in consumer gear, items that don't use the nicer caps anyway.
At least they never went with Capxon
Hello,
There is exactly the same click sound. I noticed it about 2 years after the purchase of M-DAC.
Replaced all, not only the bad, but totally all the Lelon electrolytic and Lelon, blue marked, OCRZ capacitors.
Type and parameters are selected in accordance with the datasheet of capacitor manufacturers.
Lelon RXY electrolytic => Panasonic FC,FR, Nichicon, United Chemi-Con
electrolytic
Lelon OCRZ (Aluminium Organic Conductive Polymer Capacitors) => Nichicon RL8 (FPCAP Aluminium Organic Conductive Polymer Capacitors)
(Mouser)
Click sound is the same. The reason is not in the Lelon capacitors.
The DC offset at the outputs of the MDAC, after 20 min warm-up, is about 1mV
Everyone hears a click sound like this?
There is exactly the same click sound. I noticed it about 2 years after the purchase of M-DAC.
Replaced all, not only the bad, but totally all the Lelon electrolytic and Lelon, blue marked, OCRZ capacitors.
Type and parameters are selected in accordance with the datasheet of capacitor manufacturers.
Lelon RXY electrolytic => Panasonic FC,FR, Nichicon, United Chemi-Con
electrolytic
Lelon OCRZ (Aluminium Organic Conductive Polymer Capacitors) => Nichicon RL8 (FPCAP Aluminium Organic Conductive Polymer Capacitors)
(Mouser)
Click sound is the same. The reason is not in the Lelon capacitors.
The DC offset at the outputs of the MDAC, after 20 min warm-up, is about 1mV
Everyone hears a click sound like this?
To reduce the heat load inside the M-DAC.
In the case on the right side, in the zone of the Internal regulated supply rails, just above the level of the PCB, drilled a row of 9 holes with a diameter of 6 mm.
The temperature of the case noticeably decreased.
I cant help but think that too much effort is paid to cosmetics and too little to cooling? Either include a fan system or have a metal gauze type grill ok I know you can then see the innards and little johnny can spill his fizzy drink over it but atleast it wont fail due to over heating? The psu for the Roksan Xerxes is even worse no wonder they failed often with the caps boiling dry and the chips burning up?
misterdog
Not the canine kind
Some of the caps in my Mdac have failed and I have a purpose built case with 2/3 times the ventilation area.
John Westlake had a power supply board in his drawer for several years and the caps failed on that.
The MDAC cost around £ 600 and has some 60/70 caps in it at a guess.
How much would it have cost with audio quality caps ??
Weiss the price ?
It still rates as a great DAC today especially so with an internal PSU upgrade.
John Westlake had a power supply board in his drawer for several years and the caps failed on that.
The MDAC cost around £ 600 and has some 60/70 caps in it at a guess.
How much would it have cost with audio quality caps ??
Weiss the price ?
It still rates as a great DAC today especially so with an internal PSU upgrade.
I have a domestic fan that I bombard my 8200cdq with to keep the case cool and have raised the case a bit so the air flow from the fan can get under. I removed the top of my xerxes psu and that no longer gets hot
I/ve just had a look inside and see has a lot of brown Su'scon caps how do they rate in the scheme of things?
also some black ones cant make out the name
I/ve just had a look inside and see has a lot of brown Su'scon caps how do they rate in the scheme of things?
also some black ones cant make out the name
Andrew.B
pfm Member
Sadly putting decent (not audio) caps in it would probably raise the retail price by £100 or so at least?; looking at a picture, there's 5 large ones, 24 big ones and loads of other smaller ones in it, that's a lot of cost to not simply pass on but markup, and it would have affected its sales I'm sure. If the caps went gassy even not used, then it does seem like a bad batch of electrolyte.
I tried looking for lelon caps on eBay and it said "do you mean Lemon caps?" which made me laugh
Sadly putting decent (not audio) caps in it would probably raise the retail price by £100 or so at least?; looking at a picture, there's 5 large ones, 24 big ones and loads of other smaller ones in it, that's a lot of cost to not simply pass on but markup, and it would have affected its sales I'm sure. If the caps went gassy even not used, then it does seem like a bad batch of electrolyte.
I tried looking for lelon caps on eBay and it said "do you mean Lemon caps?" which made me laugh
My experience.
The price of 111 capacitors (M-DAC mainboard + PCU) for the total replacement of Lelon was about 75 € .
In my opinion, when buying on e-bay, the high risk of fake capacitors.
By the way, the official site of Lelon now presents capacitors of the OCRZ series. Good in M-DAC.
But there are no capacitors of the RXY series, which is problematic in M-DAC.
http://www.lelon.com.tw/en/product.php#3
But there are no capacitors of the RXY series, which is problematic in M-DAC.
http://www.lelon.com.tw/en/product.php#3