Condition assessment & service proposal · September 2026

Residential Intercom Servicing

Comelit ViP, installed in 2015. Targeted unit-by-unit repairs without whole-system replacement.

Prepared for: Ban Quản Lý · Condominium Project
TP. Thủ Đức, Ho Chi Minh City
System in scope: Comelit ViP (6802W monitors, 4899M entrance panels, and 3452HD 3ONE6 Sense HD lobby panels) · excludes the third-party NFC access control system
Prepared by: Alpha Bits
Hardware & IoT Engineering

[email protected] · Ho Chi Minh City

Use ↓ / ↑ or scroll to move through the deck.

01 · The situation

Ten years in service, failing unit by unit

The condominium was handed over in 2015 with a Comelit ViP intercom across four towers. After a decade of continuous use, monitors and power supplies are beginning to fail.

605

Apartments with a 6802W monitor

4

Towers: two with 25 floors, two with 22

10+

Years in continuous service

2015

Handover year, installed by original contractor

Residents frequently report unresponsive buttons, blank screens, or lost camera video. Replacement monitors cost 10-20 million VND each and are difficult to find, while lobby panels cost up to 80 million VND. Meanwhile, maintenance requests continue to pile up at the management office.

02 · Equipment register

Hardware installed across the site

Three primary device classes in active service across 605 apartments and four residential towers.

Inside apartment · 605 units

6802W

Maxi ViP 7" hands-free colour touchscreen monitor.Linux platform, 256 MB RAM, firmware SW 2.0.100. Intercom, door release, and concierge calling.

Apartment door · 605 units

4899M

Quadra ViP external unit. Die-cast aluminium, 98° wide-angle colour camera, night LED, call button.PoE powered · IP54 rated · 95 × 195 × 28 mm

Lobby & basement · 8 units

3452HD

3ONE6 Sense HD entrance panel at main lobbies and parking basements.316 stainless steel · HD camera · graphic display · backlit keypad with Braille · third-party NFC reader (separate vendor)

03 · The maintenance impasse

Too costly for whole-system replacement, too specialised for local repair shops

Full replacement costs too much

Replacing every 6802W monitor and lobby panel would cost roughly 6-13 billion VND. The board cannot justify spending that much maintenance funding when most apartments still work fine. Replacement is repeatedly deferred while broken units pile up.

Uncommon protocol for local technicians

Local intercom shops primarily service common two-wire analog setups from COMMAX, Panasonic, or Hafele. Comelit ViP is a specialised Italian IP building system running proprietary protocols, with almost no local service coverage once the warranty expires.

Discontinued by the manufacturer

Equipment vendors usually quote full replacements for ten-year-old systems. They have little business incentive to stock 200,000₫ replacement buttons for discontinued hardware.

We provide component-level repairs so the board resolves resident complaints without funding an expensive total overhaul.

04 · Failure points

Most common faults can be fixed at component level

Typical failure modes after a decade of continuous service. The Phase 0 audit will determine the exact count of each issue across the four towers.
Symptom reported	Device	Usual cause	Outcome
Buttons unresponsive or require excessive pressureDoor release, call answer, mute	6802W	Worn button membranes, degraded contacts, or failed touch controller inputs	Repairable
Blank screen with normal audioTwo-way speech works fine	6802W	Backlight power driver or failed electrolytic capacitors	Repairable
Complete power failureNo lights, no sound	6802W	Degraded power supply capacitors (the most frequent issue)	Repairable
Random reboots, frozen screens, or dropped callsIntermittent operation	6802W	Unstable voltage rails or loose riser terminal blocks	Repairable
Cracked or delaminated screen glassPhysical glass damage	6802W	Cracked LCD panel (requires donor screen replacement)	Replace unit
No video from apartment door panelIndoor monitor works normally	4899M	Camera module failure, blown LED, or corroded PoE connector	Repairable
Lobby display unreadable or dimmedResidents cannot read prompts or enter a code	3452HD	Display board failure or capacitive keypad backlight fault	Lobby unit
Lobby camera dark or one-way audioCannot hear or see visitor	3452HD	Camera sensor failure, or speaker and microphone damaged by humidity	Lobby unit

05 · Service options

Three choices, decided apartment by apartment

Each apartment selects the option matching its hardware condition, without requiring a building-wide commitment.

Option A

Repair

Component-level repair for the existing 6802W, fixing buttons, power boards, or backlights. The monitor goes back on the wall working as it did originally.

Keeps existing hardware
Restores original operation

Option B

Repair and connect

Includes Option A plus an Alpha Bits retrofit module inside the 6802W housing, connecting it to the apartment Wi-Fi. Residents receive door calls directly on their phones, even when away from home.

Far below replacement cost
Enables mobile answering

Option C

Replace

For units with cracked LCD glass, we provide refurbished, fully compatible 6802W monitors tested and pre-configured for the building.

For physically broken screens
Subject to unit availability

Options A and B are ready to deploy immediately. Option C depends on refurbished stock and is quoted on inspection.

06 · Verified on site hardware

Tested directly on a 6802W monitor from this building

Alpha Bits module fitted inside the rear service bay of a Comelit 6802W monitor — **Internal installation:** The Alpha Bits module fits inside the 6802W rear bay beside the ViP terminal block. Installation preserves the original wiring, terminals, and factory labels without cutting cables.

Comelit 6802W screen showing an Alpha Bits pairing QR code and connection status bar — **Resident interface:** The monitor displays a QR code for quick phone pairing, along with a top connection status bar. Native Comelit menus (Intercoms, Ans. serv. setup, Setup) remain untouched and fully accessible.

Tested, powered, and operating stably on the exact 6802W model installed across all 605 apartments.

07 · Safety & isolation

Engineered to prevent interference with building systems

Apartment repairs must never disrupt neighbor intercoms, entrance panels, or shared network lines. Our technical architecture guarantees complete separation.

✓Zero building modifications: Factory firmware, internal configurations, Comelit ViP addresses, and building call routes remain untouched.
✓Isolated virtual interface: The module binds strictly to an isolated virtual IP alias (eth0:1), keeping building intercom traffic and existing subnets unaffected.
✓Fail-safe operation: If the add-on module loses power or disconnects, standard intercom calling and door release continue working normally.
✓Easily reversible: The module unplugs in minutes, restoring the monitor to its factory condition without drilling or pulling new cables through risers.
✓Resident home Wi-Fi: The module connects to the resident's private home network, never accessing building infrastructure. Call audio and video stay strictly local.

08 · Resident benefits

Restored intercoms with modern mobile conveniences

Answer visitors from anywhere

When couriers or guests buzz the apartment, the resident's phone rings with a live video feed from the door camera, enabling two-way conversation and remote door release.

Missed call logs with photo capture

Unanswered calls are saved with timestamps and photo snapshots, helping residents and landlords track visitors while away from home.

No forced learning curve

The wall monitor operates just as it always has. Residents who prefer physical buttons do not need to install an app; smartphone features are completely optional.

Reliable local technical support

Repairs come with clear warranty terms and an established local technical team ready to assist with future maintenance.

For building management, an ongoing resident complaint turns into a reliable service funded directly by participating owners.

09 · Lobby and basement panels

Component-level repair for shared entrance panels

While apartment units are funded by individual owners, lobby and basement panels belong to common property. Component-level repair saves the building from costly 80 million VND replacement quotes.

One-piece panel, serviceable inside: The 3ONE6 Sense HD is a single vandal-resistant stainless front plate, so there are no clip-out modules to swap at the wall. The parts that actually fail sit on boards behind that plate — HD camera assembly, display, capacitive keypad, speaker and microphone — and the stainless front itself effectively never fails. A whole-panel quote therefore replaces a great deal of hardware that is still good.

Targeted maintenance: Ground-floor and basement panels face high traffic, humidity, and heat. Most faults originate in predictable sub-components that can be repaired cleanly.

Swap and bench repair: One tested spare panel held on site covers all eight locations. A failed panel is exchanged in a single visit and repaired on the bench, cutting lobby downtime from several weeks of procurement to a few hours.

Comelit 3452HD 3ONE6 Sense HD lobby panel with scrambled, unreadable display characters — **Actual failure on a 3452HD panel:** Scrambled characters and column noise leave the on-screen prompts unreadable. The stainless front is undamaged and the panel remains structurally sound — the fault lies on a board behind the plate, identified and priced at inspection.

The NFC access control is a separate system: The card reader at the base of the panel belongs to a different vendor and is not Comelit SimpleKey. It does not sit on the ViP network, and Alpha Bits neither services nor modifies it — panel work is scheduled around it so the reader is left untouched.
Entrance panels are quoted individually after inspection. If a panel is genuinely beyond repair, we will advise the board candidly and assist with official procurement.

10 · Rollout plan

Starting with a site audit and ten-unit pilot

A structured process with clear evaluation gates between phases.

Phase 0

Fleet audit

We inspect all reported faults across the four towers and provide a comprehensive condition register detailing failed 6802W units, degrading lobby modules, and required fixes. The board retains this assessment document unconditionally.

No charge · 2-3 weeks

Phase 1

Ten-apartment pilot

We repair ten units under full warranty for residents with active maintenance requests. The board and participating residents inspect the results directly before proceeding.

Fixed price · 3 weeks

Phase 2

Resident self-registration

Following board sign-off, residents book and pay for repairs directly. This requires no capital expenditure from building funds; management simply posts an informational notice and coordinates site access.

Resident-funded · ongoing

Phase 3

Lobby panels & standing service

Component-level overhaul for the 3452HD lobby and basement panels, with an optional annual maintenance agreement covering an on-site spare panel and guaranteed response times.

Board-funded · by agreement

11 · Why Alpha Bits

Engineering expertise proven directly on site equipment

Alpha Bits is a Ho Chi Minh City technology team working across hardware and software engineering. Technical verification on this exact intercom model is complete.

Directly verified on building hardware

Development was completed on a genuine 6802W unit from this building running SW 2.0.100 firmware. We have analyzed its boot routines, component failure patterns, and circuit repair paths.

In-house hardware engineering

We design and manufacture the retrofit module in-house. That enables us to deliver modern smart intercom capabilities at a fraction of the cost of imported replacement monitors.

Complete system isolation

Strict electrical and network isolation from building infrastructure was established as our primary design requirement. We welcome technical inspections with the board's engineers.

Committed local partner

Surrounding residential developments share identical Comelit ViP systems of similar vintage. We are establishing long-term regional service capabilities with dedicated local technical backing.

12 · Action items

Three straightforward approvals, requiring zero building funds

Fleet audit walkthrough: Authorization to inspect reported faults in consenting apartments and test the lobby 3452HD panels. Alpha Bits provides all technicians, test equipment, and insurance.
Ten-unit pilot approval: A brief written approval to repair monitors for ten residents with active requests, giving the board clear results to review.
Resident announcement: A simple bulletin notice informing residents of the service once the pilot proves successful. Scheduling and billing are handled directly with residents.

Next step: schedule the site audit with the BQL technical lead. Full pricing, scope of works, and technical specifications are provided in the appendix below (press ↓ to view). · [email protected]

Appendix A · Commercial

Full replacement versus targeted component repair

Both projections use benchmark figures from quotes already supplied to the management board.

Full system replacement6,7 - 12,7 tỷ VND

605 × 6802W monitors at 10-20 million VND, plus 8 × 3452HD entrance panels at 80 million VND. Funded entirely from building maintenance reserves.

Targeted repair (failed units only)0,5 - 1,0 tỷ VND

Scenario: repairing 90-150 monitors at an average of 5 million VND, plus entrance module servicing. Funded primarily by individual residents over time.

04 tỷ8 tỷ12,7 tỷ VND

This estimate illustrates an operational scenario for planning purposes. It models 15-25% of monitors requiring attention over a three-year window, alongside eight entrance panels. The Phase 0 audit will verify exact quantities on site. Chart bars display the upper estimate for each option on an identical scale.

Appendix B · Indicative pricing

Service price schedule

Indicative ranges for budgeting purposes, valid pending the Phase 0 audit. Binding quotes are issued per device after inspection. Prices exclude VAT. “Market price” reflects replacement estimates previously received by management.
Scope	Device	What is included	Alpha Bits	Market price
Diagnostic inspectionPer apartment	6802W	Inspection and written diagnosis. Credited in full against any subsequent repair work.	Free	-
Option A: Component repairExisting monitor	6802W	Repairs to buttons, power boards, and backlight drivers. Includes a twelve-month warranty.	1,5 - 3 tr	10 - 20 tr
Option B: Repair & smart connectExisting monitor + module	6802W	Option A plus the Alpha Bits module, resident Wi-Fi integration, and smartphone app setup.	4 - 6 tr	10 - 20 tr
Option C: Compatible unit replacementFor physically broken screens	6802W	Refurbished, fully tested compatible monitor, installed and configured. Subject to donor availability.	6 - 9 tr	10 - 20 tr
Apartment door entrance unitPer door unit	4899M	Servicing for camera sensors, night LEDs, button assemblies, or corroded PoE jacks.	2 - 5 tr	-
Lobby / basement panelPer panel · board-funded	3452HD	Servicing for camera, display, keypad, speaker, or microphone. Excludes the third-party NFC reader. Quoted upon inspection.	15 - 30 tr	80 tr
Maintenance contractAnnual · board-funded	All	Scheduled panel servicing, on-site spare module, guaranteed response times, and regular health audits.	By agreement	-

Appendix C · Technical

Technical specifications

Engineering details supporting the system isolation and fail-safe commitments in section 07.

System boundary: The module connects to the 6802W internal service header inside the rear bay. It does not join the Comelit ViP call network, does not register as a ViP endpoint, and holds no address in the building's ViP directory. Any required local IP address binds exclusively to a virtual alias interface (eth0:1), keeping the physical interface, its IP configuration, and building routing tables intact.

Failure behavior: The module draws power independently and does not sit in series with call audio, video, or door-release signals. If the module loses power or Wi-Fi connectivity, standard intercom calling and door release continue operating as normal.

Reversibility: The retrofit is purely additive and requires no drilling, wire cutting, riser cabling, or firmware modifications. Unplugging the module returns the terminal to its factory state in under fifteen minutes.

Data and privacy: The module communicates exclusively through the resident's home Wi-Fi network. Call events and video streams are handled locally on the resident's devices, creating no central data storage or compliance overhead for management.

Emergency broadcasts: If the intercom connects to the building emergency alert system, we will inspect this integration during the Phase 0 audit and certify non-interference in writing prior to any pilot installations. This documentation can be submitted to fire safety consultants upon request.

Demonstration unit: All isolation and safety claims can be demonstrated on a bench unit at the board's convenience, including live power-interruption tests to verify uninterrupted intercom operation.

Comelit 6802W system information screen with network identifiers redacted — **6802W system information, as surveyed.** Firmware SW 2.0.100, 256 MB RAM, unit label MONITOR D1809. Network address, MAC and ViP address are redacted in this document; full values are documented in the condition register provided to the BQL.