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Start / control board for JBL SUB140P / 230

The small start-up control board of the SUB140P/230, built around an MPC82L52AT microcontroller. The cheap part that quietly kills the whole subwoofer when it fails.

In stock OEM part no. JBL140P start board (MPC82L52AT) Our ref. RB-SUB140-START

Beside its main power and amplifier boards, the SUB140P/230 carries a small start/control board — the board our production files simply call JBL140P start board. It is built around an MPC82L52AT microcontroller and a VH-6A connector, with the decoupling capacitors around it.

Because it supervises start-up, a failure here looks exactly like a dead main board: the subwoofer does nothing at all. Swapping this inexpensive board first is the correct diagnostic order.

Ships pre-programmed with the controller firmware matching the original unit; bulk pricing makes it sensible to keep one in stock alongside the two main boards.

Verified fitment

  • JBL SUB140P
  • JBL SUB140/230
  • JBL 140P

Board type

Board typeStart-up control board
Core chipsetMPC82L52AT MCU · VH-6A connector
PCB processPer original process sheet
VariantsShips pre-programmed with matching firmware

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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