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Harman Kardon · Power supply board

Power supply board PBA021023500 for Harman Kardon Bluetooth speakers

175 W switch-mode supply with a 35 V / 5 A main rail and a 5 V / 3 A auxiliary rail. Board marked PBA021023500 — verify against the number printed on your original board before ordering.

New OEM part no. PBA021023500 Our ref. RB-PBA021023500
Power supply board PBA021023500 for Harman Kardon Bluetooth speakers
Component side (front)
Power supply board PBA021023500 for Harman Kardon Bluetooth speakers
Solder side (back)

This is the internal switch-mode power supply used in Harman Kardon Bluetooth speakers, rebuilt to the board marked PBA021023500 (the number is printed in the board silkscreen and visible in our photos). The board delivers two regulated outputs: a 35 V / 5 A main rail (175 W) that feeds the Class-D amplifier section, and a 5 V / 3 A auxiliary rail (15 W) for the control, Bluetooth and display circuitry.

The mains input is dual-range 100–120 V / 200–240 V AC at 50/60 Hz, with robust primary-side filtering, two large 450 V reservoir capacitors and generous heatsinking on the secondary rectifiers — the same construction as the original. Board size is 150 × 95 × 48 mm including heatsinks and connectors, so it drops into the original mounting position.

Every board is bench-tested at full load on both rails before shipping. If you are not sure whether your speaker uses this board, send us a photo of the supply board inside your unit — the PBA021023500 marking on the green PCB silkscreen is the definitive check, and we will confirm fitment before you order.

Verified fitment

  • Harman Kardon Bluetooth speaker with board marked PBA021023500

Board type

Board typeSwitch-mode power supply (SMPS)
Bare-board drawing no.PBA021023500
Mains input100–120 V / 200–240 V AC (dual range), 50/60 Hz
Output stageRail 1: 35 V / 5 A (175 W) · Rail 2: 5 V / 3 A (15 W)
Dimensions150 × 95 × 48 mm (L × W × H, incl. heatsinks)
PCB processDual-output SMPS, heatsink-cooled rectifiers
ProtectionMains fuse + primary filtering, per original circuit

Questions that come up before a first order

Will this board fit my unit without modification?

Yes, if your model appears in the fitment list above. The boards are rebuilt from the original production drawings, so footprint, mounting holes and connector set match the original. If your model is not listed, use the model matcher or send us a photo — we answer before you order.

What warranty do I get?

24 months from delivery against manufacturing defect, for both consumer and trade buyers. A board that fails in normal use is replaced rather than debated.

How do I know whether I need the power board, the amplifier board or the control board?

Measure the supply rails first. If the correct DC voltage is present at the amplifier input, the supply is healthy and the fault is downstream. If the unit is completely dead, start with the supply — and remember the control board supervises start-up, so a replaced supply that still will not start points at the control board. If you are unsure, send us a photo and we will tell you before you order.

Do you ship outside the EU?

Yes. We ship worldwide, but EU and UK orders ship from local stock with duties and import VAT settled by us. Orders to other regions may attract local duties payable on delivery.

Can I buy a single board if I'm not a business?

Of course. Trade pricing starts at 10 units, but private customers and individual technicians order single boards every day at the retail price shown.

Repairs on mains-powered equipment carry a serious shock risk

Repairs on mains-powered equipment carry a serious shock risk. Work only with the unit unplugged and the reservoir capacitors discharged, or leave it to a qualified technician.

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