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Bosch WAS28442 Logixx 8 Inverter Failure - Seeking Transformer V17423 Data & Substitute

yoshi62 8790 13
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  • #1 16861145
    yoshi62
    Level 10  
    Posts: 20
    Hello
    The inverter in my washing machine failed. The burnt parts were replaced but the washer still showed the problem F57 . After further measurements, I came to the Hahn V17423 transformer. I found a transition only on connectors 6 and 7, but I think it's a jumper. In addition, there is no transition either on the primary or on the secondary. Could someone give me the data on which legs the primary and secondary windings are? What voltage should come out of the transformer. It is not commercially available, does anyone know a substitute?

    Bosch WAS28442 Logixx 8 Inverter Failure - Seeking Transformer V17423 Data & Substitute

    Bosch WAS28442 Logixx 8 Inverter Failure - Seeking Transformer V17423 Data & Substitute Bosch WAS28442 Logixx 8 Inverter Failure - Seeking Transformer V17423 Data & Substitute
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  • #2 16861217
    POL02
    Home appliances specialist  
    Posts: 2596
    Help: 180
    Rate: 549
    Take photos of the module from both sides, it will be easier to talk.
  • #3 16861471
    cezet
    VIP Meritorious for electroda.pl  
    Posts: 7549
    Help: 718
    Rate: 1405
    yoshi62 wrote:
    The burnt parts were replaced, but the washing machine still showed the F57 problem

    Probably LNK 304 was burned and three resistors. You can't do anything about it - the module needs to be replaced.
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  • #4 16861616
    yoshi62
    Level 10  
    Posts: 20
    Everything listed, only the voltage from the transformer is missing.
  • #5 16861655
    POL02
    Home appliances specialist  
    Posts: 2596
    Help: 180
    Rate: 549
    As for this transformer, it is probably a choke of the anti-interference filter.
    In the photo you can see the elements you replaced (marked in red).
    However, the inverter does not work. In order for the inverter to work, it must have the correct power supply
    +5V to the processor from the power supply (you replaced the chip in it). did you check it?
    It's possible that the processor was also damaged when the PSU was damaged.
    Attachments:
    • Bosch WAS28442 Logixx 8 Inverter Failure - Seeking Transformer V17423 Data & Substitute 1.jpg (516.31 KB) You must be logged in to download this attachment.
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  • #6 16861679
    yoshi62
    Level 10  
    Posts: 20
    You're absolutely right about that choke. I'm working in the dark because of course I don't have a schematic. Probably a layman's question, but what elements are included in the power supply? Is it on the inverter board?
  • #7 16861775
    POL02
    Home appliances specialist  
    Posts: 2596
    Help: 180
    Rate: 549
    yoshi62 wrote:
    what components are included in the power supply?

    In the photos I marked the converter system and the capacitor on which the voltage should be measured.
    Attachments:
    • Bosch WAS28442 Logixx 8 Inverter Failure - Seeking Transformer V17423 Data & Substitute 2.jpg (501.24 KB) You must be logged in to download this attachment.
    • Bosch WAS28442 Logixx 8 Inverter Failure - Seeking Transformer V17423 Data & Substitute 1.jpg (518.36 KB) You must be logged in to download this attachment.
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  • #8 16862259
    yoshi62
    Level 10  
    Posts: 20
    The converter circuit has been replaced, but I need to measure the voltage across the capacitor.
  • #9 16864588
    yoshi62
    Level 10  
    Posts: 20
    The measurements show that there is no 5 V power supply. The input voltage is 5 V and the output is 0 V. What should the input voltage be?
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    #10 16864603
    cezet
    VIP Meritorious for electroda.pl  
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    Measure on the processor power supply, it is 99% damaged.
  • Helpful post
    #11 16864616
    POL02
    Home appliances specialist  
    Posts: 2596
    Help: 180
    Rate: 549
    Waste of your time. I did not want to write about it early, but in these modules it is so that when the converter system is damaged, the processor is damaged.
  • #12 16864869
    yoshi62
    Level 10  
    Posts: 20
    I found the next bug :) Charred transition from one side to the other side of the board + LNK304PN power supply. I now have 15V at the output. A bit too high :) I will also replace the CPU if needed. Is the selected element a capacitor (because it looks like that)? I have a short circuit on this element.
    Bosch WAS28442 Logixx 8 Inverter Failure - Seeking Transformer V17423 Data & Substitute
  • #13 16865050
    cezet
    VIP Meritorious for electroda.pl  
    Posts: 7549
    Help: 718
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    yoshi62 wrote:
    I will also replace the CPU if needed.

    You obviously have a dead CPU. I'm curious how and what you program the new one.
  • #14 16865207
    yoshi62
    Level 10  
    Posts: 20
    I think you're right and it's a waste of time. Thanks for the help.
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Topic summary

✨ The discussion revolves around a failure of the inverter in a Bosch WAS28442 Logixx 8 washing machine, specifically related to the Hahn V17423 transformer. The user reports that after replacing burnt components, the machine still displays an F57 error. Participants suggest that the inverter may not be functioning due to insufficient power supply to the processor, which could also be damaged. The user is seeking information on the primary and secondary windings of the transformer and potential substitutes, as the original part is not commercially available. Further troubleshooting reveals a lack of 5V output from the power supply, indicating possible damage to the processor. The user identifies additional faults, including a charred connection and a faulty LNK304PN component, and is considering replacing the CPU.
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FAQ

TL;DR: Bosch Logixx 8 inverter failures often burn the LNK304 and “three resistors”; experts warn “the module needs to be replaced.” [Elektroda, cezet, post #16861471]

Why it matters: This FAQ helps DIYers diagnose F57 errors, confirm PSU faults, and decide between board repair and full module replacement.

Quick Facts

What does F57 mean on a Bosch Logixx 8 in this case?

On this machine, F57 stuck after an inverter event. The thread shows F57 persisted despite replacing burnt parts, pointing to a failed inverter power section. Use it as a cue to check the PSU, logic 5 V rail, and motor control board for damage. [Elektroda, yoshi62, post #16861145]

Is the Hahn V17423 actually a transformer?

No. The part identified as Hahn V17423 on this board functions as an EMI choke in the input filter, not a step-down transformer. Treating it as a transformer leads to dead-end measurements because you won’t find primary/secondary windings. “It is probably a choke of the anti-interference filter.” [Elektroda, POL02, post #16861655]

Which components typically fail when this inverter goes down?

Experienced repairers flagged the LNK304 switcher IC and three resistors as the usual casualties. Once those go, downstream logic and supply rails become suspect. Many users choose board replacement at this stage to avoid chasing collateral damage. [Elektroda, cezet, post #16861471]

Where do I measure the 5 V rail to confirm the PSU is alive?

Probe the capacitor highlighted near the converter section and confirm 5 V reaches the microcontroller supply pins. Lack of 5 V at the MCU means the PSU is still down or there’s a shorted load. “I marked the converter system and the capacitor on which the voltage should be measured.” [Elektroda, POL02, post #16861775]

I see 5 V in and 0 V out of a regulator—what does that imply?

That points to a hard short or an overcurrent shutdown on the regulator’s output, often caused by a damaged microcontroller. The advisor’s guidance was to verify at the processor because it’s likely failed. Replace or isolate the load to retest. [Elektroda, cezet, post #16864603]

Can a blown converter kill the CPU on this module?

Yes. Technicians report that when the converter dies, the processor often dies with it. Overvoltage or surge conditions propagate into logic rails, rendering the MCU nonfunctional. “When the converter system is damaged, the processor is damaged.” [Elektroda, POL02, post #16864616]

I measured 15 V on the output—shouldn’t it be 5 V?

Correct, logic rails must be 5 V. A measured 15 V indicates regulation loss or misrouting, and can destroy the MCU and decoupling parts. In the thread, 15 V coincided with a shorted small capacitor callout. Power down before further tests. [Elektroda, yoshi62, post #16864869]

Is it worth repairing the board, or should I replace the whole module?

Pros in the thread recommend module replacement once the LNK304 and resistors burn, due to likely MCU damage and hidden faults. As one expert put it, “the module needs to be replaced.” This often saves time versus piecemeal repair. [Elektroda, cezet, post #16861471]

Can I simply replace and program a new CPU myself?

Replacement demands the exact programmed firmware image and suitable tools. The expert challenge was direct: “I’m curious how and what you program the new one.” Without the OEM image, success is unlikely. Most go for a complete module. [Elektroda, cezet, post #16865050]

What hidden faults should I check besides the obvious burns?

Inspect for charred vias and broken through-hole transitions between PCB layers. The thread documents a burned interlayer via that blocked proper supply routing. Edge case: such a via can read fine from one side yet fail under load. [Elektroda, yoshi62, post #16864869]

How do I quickly triage this inverter board?

  1. Verify AC input filtering and confirm the EMI choke isn’t open.
  2. Check the converter area (LNK304 and series resistors) and measure the marked capacitor.
  3. Confirm a stable 5 V at the MCU; if absent or high, suspect the CPU and plan for module replacement. [Elektroda, POL02, post #16861775]

Are official schematics available for this inverter module?

None were available to the thread participants. One repairer worked “in the dark” without a schematic and had to trace power paths manually. Expect reverse-engineering time if you pursue component-level repair. [Elektroda, yoshi62, post #16861679]

What is the LNK304PN doing on this board?

It is the small offline switcher that forms the low-voltage power supply feeding the logic and inverter control. In this case, it was replaced along with other PSU parts before further checks of the 5 V rail and MCU health. [Elektroda, POL02, post #16861655]

A tiny capacitor near the PSU reads short—what next?

Shorted decoupling capacitors often appear after overvoltage. Remove power, lift one leg to verify the short, and check for 5 V rail recovery. Investigate for upstream faults that caused the stress before replacing the cap. [Elektroda, yoshi62, post #16864869]
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