So considering the difference in price I have neogiated to get anew pair for the price they quoted for the repair. Much happier now. BUT - Battery is a consumable, and it should not cost 90 % of theproduct cost to replace the batter ( well tell that to the mobile phone manufacturers too)

DId you get any response to this? My son's PXC 550 behaved very much the same- and similar scenario he has no proof of purchase so no warranty, and we just got a quote - IT costs extra 30 $ to get a new pair - I gues they are not in the reapir business. So If anybody has a link to a teardown...

I have both ( D30 still in repair mode) and a Sabaj Da3. I am using the sabaj through a lehman and frankly I can not pick any differences from the D30 even though the Sabaj output is fromt he headphone out into line in. For me it is more matter of needing to use 3 pin to RCA adapter more than...

try to replace with the seller? Sometimes drivers can sause that.sometimes Cellphone close by or bad shielding. If the noise disapeared when you swapped USB cables it is Possible that the USB Connector on EITHER side can be bad. Does the noise change if you wiggle the USB cable

It will be weekend soldering for me I think: talked to both the supplier and Topping - me being in Australia, Shipping back to base for repair and than back to me will set me about 80 AUD. that is about 65 % of a brand new with free shipping from Aliexpress ;-). No Go. Buying just the board and...

Ok, Final diagnlostics - The 3.3 V Supply to the Cs4398 chip is not at the right voltage - it is about 0.9 v down, which basicaly means the DAC does not work - the USB receiver does the job ( that is the one picked up by windows) But nothing more. I suspect deadish LM1117 3.3. Interestingly...

I am posting in a sense to keep some documentation of what I am doing - so _ If Anybody gets their hands on a schematics I would appreciate: My diagnostics seems to have picked up the cause of no sound output. Did all the static ( DC) voltage measurements on the test points. The main Culprit...

apologies for my bad typing. It is Only en.tpdz.net

yup. en.tpdz.net

there is high pitch noise when I crank up the headphone amp - so even though not moded, I may be experiencing some osicilation ( I can hear it so it is under 12 khz - the limit of my hearing :-) ). No Osciloscope, But I'll measureany DC conditions first - will be fun. Not desoldering...

Would anybody have a schematic of the d30? I have been using it now for about 6 months, and was working perfectly well - a couple of days ago it simpy stopped mid stream ( I mean the audio out stopped) Windows still recognizes it, and even shows as if it is playing a test tome through it - so...

based on the No OPamp measurements, it looks like you get o.o3 at the very RCA- I assume you have checked for no shorts on the RCA itself? if you just sum the voltages on the path from the very input to the input pins, you get almost no voltage drops, meaning minimlal current flow . What...

asmuch as I can agree with what you said, the whole thread started as support to somebody who has no or minimal knowledge, and minimal tools. AND no titme or possibly inclination to go take a course and buy tools. the topology of the amplifier is quite simple. if you remove the OpAmp, you...

ok, so could be anything - related to cold solder - I would simply resolder all the spots in the path from the input to the opamp - i don;t think you have a [roblem further back, but may be worth checking anyway. it sounds like a cold solder that is intermitently connecting, and it sounds like...

Swapping components is not the best way forward- you say you swapped the capacitor at the input on the non working channel . Do you get 0.492 V AC after it? just before the ALPS POT or not ? My suggestion would be to remove the opamp from the socket. and then measure if you are getting the...