Mail-in repairs, available throughout Poland
Factory audio amplifier
Manufacturer: Harman Becker
No sound, crackling, or an amplifier that keeps working after the car is switched off? We refurbish Logic7 from the Mercedes S-Class W221 and CL C216. Check your unit designation and describe the problem — we will determine whether we can help.
Quick repair quote
Logic7 is the factory Harman Kardon amplifier in the Mercedes S-Class W221 and CL C216. It comes in several versions, so before repair we check the Becker designation and the part number on the label.
Applications: versions with the Harman Kardon Logic7 audio system.
On the casing you will find the harman/kardon Logic7 marking, and on the label the Becker model, e.g. BE7021, BE9021, BE9061 or BEM005. The logo alone is not enough to identify the version — send a photo of the entire label.
The amplifier is located in the boot, on the left above the wheel arch, behind the side trim. Before removing it, check whether there are any traces of water in this area. If you do not have experience in dismantling, ask a workshop to do it.
Mercedes part numbers start with A221, e.g. A2218701789. Compare the full number, not just the prefix. The Becker designation and the part number together help identify your amplifier version.
Choose the car model and check the full number on the label. The list is for identification, not for selecting a replacement. If you cannot see your number, send a photo — we will check your version.
Below we describe the typical Logic7 faults and the scope of inspection. In your enquiry, write what is happening to your unit.
The amplifier sometimes plays, and sometimes stays silent. The sound may cut out after a few minutes or change with temperature. One cause is board damage linked to moisture and corrosion. We check the electronics and audio channels, and once the fault is confirmed we repair the damaged components and connections.
The system reports an unavailable device, and there is no sound from the speakers. The amplifier may not be responding on the MOST fibre-optic network; the message alone does not yet indicate the cause. We check the power supply and Logic7 communication on the bench to confirm whether the amplifier is faulty.
The fan keeps running or the amplifier stays hot when parked, and the battery goes flat. A faulty unit may not switch properly into standby. We check the module operation and its power supply. A flat battery on its own also requires other causes in the car to be ruled out.
The problem appears immediately after emergency starting the car. Electrical board damage, including the OASIS circuit, needs to be checked. We assess the condition of the electronics and whether it can be repaired. Mention the use of a booster straight away in your enquiry.
The subwoofer stays silent, there is a single click, or one side stops playing after some time. This symptom requires checking the amplifier channels and the audio installation. We test all Logic7 channels. We repair confirmed faults and check the sound again after refurbishment.
Refurbishment of the unit costs 2460 zł incl. VAT. The price includes diagnostics, board repair, testing and anti-corrosion protection. Before we begin, we confirm whether this service can be carried out. We issue a VAT invoice.
After checking Logic7 we confirm the scope of refurbishment and the price. We start work after your approval.
Logic7 refurbishment usually takes 1–5 working days. When planning, also allow for transport, removal and refitting. You can confirm the lead time for your unit when you submit it.
You receive a 24-month written warranty on the entire amplifier. The warranty does not cover repeat flooding or dampness, so before refitting you must remove the source of water in the boot.
Logic7 is fitted behind the side trim in the boot. If the unit has been in contact with water, you need to identify the path it took to get there and fix the leak. The areas around the lamps, tailgate and wheel arch may need checking.
Protecting the electronics after repair does not replace removing the source of water. Repeat flooding or dampness is not covered by the warranty. Mention any damp and the condition of the mounting location when you submit the unit.
We clean the board, remove corrosion hotspots, rebuild damaged tracks and replace faulty components. We also include parts prone to failure. After repair, we protect the electronics with a protective coating.
On the bench we check the power supply, MOST fibre-optic communication and all audio channels. In your enquiry, also describe faults that appear only after a few minutes of operation — this helps us plan the unit check.
You can submit Logic7 after a previous repair, flooding or OASIS circuit damage. Describe what was done and how the amplifier behaves now. If you have documentation from the previous work, include it with your enquiry.
Whether a particular amplifier can be refurbished is confirmed after assessing the board; heavy corrosion or mechanical damage may limit the scope of work.
01
Provide the Mercedes model and year, describe the symptoms and attach a photo of the Logic7 label. Mention any damp, use of a booster or previous repair. We usually reply within 24 hours on working days.
02
Send the amplifier only, without cables or frame. Wrap it in bubble wrap, protect the connectors and secure it in a rigid box with padding.
03
On request, we can arrange courier collection and return at our expense. After receiving the unit, we check it and confirm the scope of work. We start the repair after your approval.
04
We return the checked amplifier with a VAT invoice and a 24-month written warranty. Before refitting, remove any leaks in the boot. After refurbishment, your own amplifier goes back into the same car without any additional coding.
Rating 5 out of 5. GOOGLE REVIEW
Many thanks to the entire OEMatic team for repairing the radio in my Lexus CT.
Professional and reliable service. I can wholeheartedly recommend this workshop!
Problem: black screen, no working radio, no interaction with the radio at all.
Jan BałRating 5 out of 5. GOOGLE REVIEW
Highly recommended! My OEM JBL amplifier from a Toyota (CHR, 2017) suffered a short circuit, and other audio workshops would not agree to repair it. Here the problem was solved extremely quickly. They received the parcel on Monday, and by Thursday the repaired unit was back with me. Excellent communication at every stage, and most importantly – the price includes a 24-month warranty.
Complete professionalism!
Mateusz JaniczekRating 5 out of 5. GOOGLE REVIEW
A service absolutely worth recommending. After years of problems with the infotainment head unit in my Skoda Superb constantly freezing and resetting, the MIB was finally repaired. The main dealer could only offer a replacement with a new unit for 3500 eur (!), other car audio companies could not help, and OEMatic carried out the repair in 1 day.
Piotr NofskiRating 5 out of 5. GOOGLE REVIEW
I recommend them wholeheartedly….I don’t know how they did it, but they decoded the radio from an Iveco Daily 2020 faster than it takes to pack the parcel with the radio…One workshop promised a lot, but failed and said the radio was only fit for scrap. I highly recommend them — complete professionalism and a good price. Best regards.
autoodnowa u.Rating 5 out of 5. GOOGLE REVIEW
I can definitely recommend them. Mr Tomasz repaired my BOSE amplifiers, RNS, NTG navigation units and more. Always 100% successful, fantastic customer approach and a convenient online platform for placing repair orders.
Piotr BrzezinaRating 5 out of 5. GOOGLE REVIEW
I recommend OEMatic — only 3 days passed from sending the radio to the workshop and having it fitted back in my car.
The radio from a Mercedes ML W164 2007 NTG2 BE 6089 had its fault diagnosed extremely quickly, and the repair was carried out just as fast.
Communication with Mr Tomasz was excellent, and updates from the workshop on the progress of the repair were sent promptly. This is definitely a workshop other people can learn from.
An obvious 5 stars from me.
AdrianRating 5 out of 5. GOOGLE REVIEW
I had a problem with my Audi A3 8V, with no sound from the factory multimedia player. The guys solved the problem in a few days. I recommend them!
Rafał NiżnikRating 5 out of 5. GOOGLE REVIEW
Service and expertise 100%. Thank you for helping with my RNS 315 radio. Highly recommended!
Michał TuzRating 5 out of 5. GOOGLE REVIEW
VW Touran radio, I sent it to the company because the reversing camera was not working and the radio would not turn on. Sent by courier. Diagnosis: no faults. (the fault needs to be looked for elsewhere) The radio was sent back quickly and the company did not charge anything, not even for the return postage. There probably aren’t many honest companies like this left here in Poland. Many thanks.
John DoeRating 5 out of 5. GOOGLE REVIEW
Definitely recommended. Very fast repair and very good, speedy communication. Information was available at every stage of the repair request process — an online repair management system. The unit (radio) was already meant to be written off and replaced with another used one. Fortunately, I accidentally found the OEMatic blog while looking for a replacement, and it saved me from replacing it with another used unit, which would have been a loss for the appearance (the fronts of the replacements I found were not in such good condition, and all of them were older than my unit from pre-facelift models); the newer ones were more expensive than the repair. So that’s a plus too.
Artur KozubskiRating 5 out of 5. GOOGLE REVIEW
RNS 315 radio with faulty Bluetooth. The radio sounds better than new. Others gave up on the repair, OEMatic handled it efficiently and quickly without any problems. We need more professionals like this. Thank you for the repair.
Krzysztof SzabońRating 5 out of 5. GOOGLE REVIEW
Professionally carried out repair of a factory VW radio, excellent communication, complete professionalism. May there be more companies like this in Poland.
Sławomir PobłockiRating 5 out of 5. GOOGLE REVIEW
I left a Honda Jazz radio panel for repair. In addition to the radio, the guys also repaired the CD player at the same price, even though I hadn’t asked them to. I also received spare bulbs for the button backlighting. Very friendly and professional, the radio and player work flawlessly. I recommend them with a clear conscience. Such expertise is rare nowadays.
b nowickiRating 5 out of 5. GOOGLE REVIEW
Highly recommended. ZENEC radio after the pin was blocked. Code removed. Radio works, old pin. Fast, 1 day. Telephone contact without any problem. Parcel safely packed.
Stefan NowakRating 5 out of 5. GOOGLE REVIEW
For a long time I’d been battling an annoying problem in my VW Passat B8 — the car radio kept losing sound. Fortunately, I found OEMatic Car Media Lab and it was a perfect choice!
From the first contact it was clear there was professionalism and huge knowledge of factory audio systems. Quick diagnosis and an even quicker (and most importantly: EFFECTIVE!) repair! The result? The radio plays crystal clear, with no dropouts or interruptions. You can tell the fault was removed at the source, not just temporarily masked.
If you have any problems with factory audio, navigation or the radio in your car (especially VW, Audi, Skoda!), I definitely recommend OEMatic Car Media Lab. True experts!
Łukasz PuziakRating 5 out of 5. GOOGLE REVIEW
The Harman-Kardon amplifier in my BMW F33 was flooded, so I decided to hand it over to OEMatic. A quick check to see whether it could be saved — yes! it could! A few days later the amplifier was back with me after repair.
For a moment I also had doubts whether only the amplifier had been damaged by the flooding, because I lost the ability to set the time and information such as instant fuel consumption or average fuel consumption disappeared; after a phone call I was told that this can happen because of a break in the car’s CAN circuit due to the amplifier being absent.
The theory proved correct, and fitting the already repaired amplifier helped and all the functions returned.
I hope the amplifier will serve for a long time to come and without faults.
I honestly RECOMMEND IT!
Michal MarecikRating 5 out of 5. GOOGLE REVIEW
A great company, they will help you in any situation when it comes to navigation.
Two companies from the Małopolskie region where I live suggested replacing the unit; at the authorised service centre the fault repair would cost 1400 ,- and they helped me fix it, and over the phone 😃
Miroslaw SytyRating 5 out of 5. GOOGLE REVIEW
The content of the reviews I read quickly convinced me to have my unit repaired at OeMatic. I expected the highest quality of service at every stage and that is exactly what I received. After the phone call I received all the information needed for shipping by text message. As soon as the workshop received the parcel with the radio, I got a phone call, we agreed the details, I confirmed the price and the repair began. In the afternoon of the next day I was informed that the repair had been completed, I settled the bill and the radio was back with me after 4 days. It seems there is no room for even the slightest shortcoming in this company (such as a delay with a text message).
For me, this is the highest quality.
Thank you very much for the repair and I wish you success🙂
Dawid
Ania ŁyszkowskaRating 5 out of 5. GOOGLE REVIEW
Professional and reliable service. The fault was initially diagnosed remotely, and the repair cost estimated. The unit was delivered to the workshop and collected remotely by courier. Everything was fast, straightforward and efficient. The car audio came back to life 🙂
I can recommend them with a clear conscience.
Bartłomiej MachnikRating 5 out of 5. GOOGLE REVIEW
Five stars is not enough..
OEMatic solved the problem with a non-working USB port (motherboard repair) in the factory navigation system from a Kia Sportage in express mode. Highly recommended.
KJSee how moisture affects the amplifier, which symptoms are worth reporting and what Logic7 refurbishment includes.
A photo report showing board cleaning, rebuilding connections, fitting components and protecting the electronics.
A common cause is corrosion of the electronics linked to moisture in the boot. Electrical damage also occurs, for example after a surge during jump-starting. We confirm the cause of the specific fault during diagnostics.
In the boot, on the left above the wheel arch, behind the side trim. If you are not sure which part to remove, send us a photo or ask a workshop to remove it.
Check the device label: the Becker designation, e.g. BE7021, BE9021, BE9061 or BEM005, and the full Mercedes part number. The harman/kardon Logic7 logo is an additional clue. A photo of the entire label lets us confirm the version.
Yes. Describe any contact with water and any previous work carried out on the unit. We also accept amplifiers with OASIS circuit damage. We assess whether refurbishment is possible after checking the condition of the board.
The warranty covers the entire amplifier, not just the replaced components. It does not cover repeat water ingress or dampness. Before refitting, fix any leaks in the boot; you will receive the detailed terms in writing with the unit.
After refurbishing your own amplifier and refitting it in the same car, no additional coding is needed. If you are sending a replacement unit bought elsewhere, let us know in advance — matching it to the car requires a separate check.
Whether repair is possible depends on the condition of the individual board. In cases of severe corrosion or mechanical damage, another solution may be needed, for example replacing the main board. Before any work, we will present the available options and terms.
Yes. We accept Logic7 units from W221 and C216 regardless of the car’s market of origin. Before shipping, we check the unit designation and part number.
Send the amplifier only, without cables or mounting frame. If you decide not to proceed, the unit cannot be repaired, or the fault lies elsewhere, diagnostics and return shipping are free of charge. On request, we can arrange a courier both ways at our expense.
With refurbishment, you know the scope of work and receive a 24-month warranty on the entire amplifier. When buying a used unit, check its number, condition, compatibility with the car and the seller’s terms. Compare the full cost of both options, including commissioning in the car.
Yes. Refurbishment of the unit costs 2460 zł incl. VAT and includes diagnostics, board repair, testing and anti-corrosion protection. We issue a VAT invoice. If the condition of the board requires a solution other than refurbishment, we will agree it before starting work.
