Jlwm1204 stopped mid cycle

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  • September 22, 2018 at 6:41 pm #94703
    Targatopp
    Participant

    Hi my jlwm 1204 stopped mid cycle full of water.

    I have checked fuse which was ok and there is no power to the machine or anything on lcd display..is the pcb dead which costs around £160..so probably not an economic repair

    I am fairly competent electrically and have a multimeter..can I test anything or does anyone test the pub

    Thanks Paul

    September 22, 2018 at 11:44 pm #458051
    electrofix
    Moderator

    Re: Jlwm1204 stopped mid cycle

    1st check power into the machine, make sure you have both live and neutral

    if that is all ok then the fault is probably on the power supply of the main board. Take the board out and look for chunky resistor with a value around 20 to 100 ohms. if you find this resistor and its blown then post back and we can take it from there

    Dave

    September 23, 2018 at 10:01 pm #458052
    Targatopp
    Participant

    Re: Jlwm1204 stopped mid cycle

    Thanks Dave will take a look tomorrow and report back

    Much appreciated paul

    September 24, 2018 at 7:57 am #458053
    Targatopp
    Participant

    Re: Jlwm1204 stopped mid cycle

    Hi just checked circuit board.large green resistor has broken in half so needs replacing.this is below 2 pin socket in bottom middle of board
    Brown resisistor reads 0.05 ohms this sits above 3 capacitors on bottom rhs of board.position L2
    Immediately below this resistor is a small black resistor… or is it a diode. PositionD7 ????? This reads open circuit…..??????

    And then a similar black resistor do diode position D6 below the capacitors on bottom rhs reads 176 ohms


    Lastly resistor or diode? in position D4 just to the right of the green resistor at bottom middle of board reads open circuit

    Hope this makes sense..I tried to attach photo but it’s too large a file to include

    Many thanks

    Paul

    September 24, 2018 at 8:10 am #458054
    electrofix
    Moderator

    Re: Jlwm1204 stopped mid cycle

    right so its a board power supply problem

    if your small black resistor has a white ring on one end it is a diode so don’t worry too much as its probably ok

    so to effect a repair I would say change the resistor and the power supply chip. the power supply chip is a 7 leg chip.

    as for photo you can either shrink the size or post it on an external server. there are websites that can shrink your photo just do a google search

    Dave

    September 24, 2018 at 8:19 am #458055
    Targatopp
    Participant

    Re: Jlwm1204 stopped mid cycle

    Thanks dave…any idea who can supply the resistor and what resistance should it be/is it?? and again same question for power supply chip,…what does this chip do?

    I think the black things are diodes as they are marked d4 d6 etc..

    capacitors have a c number

    September 24, 2018 at 8:33 am #458056
    electrofix
    Moderator

    Re: Jlwm1204 stopped mid cycle

    I get the parts like this from either rs components or farnell

    the chip takes 300volts DC ( this is after converting mains AC to DC )and converts it to 12volts or so to power the board
    be careful as when plugged in the voltages on the high voltage side are dangerous

    resistor think its around 50 ohms but if you look at the colour rings you can work it out

    chip will be LNK*** or TNY*** from memory but you will have to be good at soldering to change it. You will also need some de solder braid to get off the excess solder.

    Dave

    September 24, 2018 at 9:56 am #458057
    Targatopp
    Participant

    Re: Jlwm1204 stopped mid cycle

    Hi Dave yes chip is lnk ..there is a local circuit board company..i will see if they will solder new bits in once i have the parts many thanks paul

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