Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

PCB fault

  • 11-06-2009 8:21pm
    #1
    legin500
    Registered Users, Registered Users 2 Posts: 56 ✭✭


    Hi there, I was 'repairing' a ghd hair straghtener tonight and when I was checking the voltage around the board the probe from my multimeter slipped and shorted out the neutral and red LED cables. The pcb has 2 leads going to either side of the LED, one labeled 'red LED' the other one labeled 'amber LED'. Now I can't get it to work.
    I was wondering;
    a) would this short 'blow' my LED and cause the pcb to malfunction?
    b) What voltage should I expect to see across this LED?
    c) Is this type of LED readily available in RS, maplins etc

    Thanks


Comments

  • #2
    DublinDilbert
    Registered Users, Registered Users 2 Posts: 5,401 ✭✭✭DublinDilbert


    To Be honest, its very difficult to say...

    By the fact you had it open, there must of been some problem in the first place. The "short" with the meter probes could of caused any amount of problems too... Also if your fixing stuff as part of the "learning" process its probably best not to work on it live for safety reasons.

    To answer your questions
    a) yes a short could blow your LED and practically every component on the PCB, depending on the nature of it.
    b) you would get a different voltage on the LED depending on the colour, for red, proabbly about 2 volts DC
    c) yes you can buy any amount of LEDs in maplin/RS, but the chance of it fixing your problem are fairly small. Also if you power down your unit, let it discharge and caps, you should be able to get the LED to turn on with the diode test on your meter.
    legin500 wrote: »
    Hi there, I was 'repairing' a ghd hair straghtener tonight and when I was checking the voltage around the board the probe from my multimeter slipped and shorted out the neutral and red LED cables. The pcb has 2 leads going to either side of the LED, one labeled 'red LED' the other one labeled 'amber LED'. Now I can't get it to work.
    I was wondering;
    a) would this short 'blow' my LED and cause the pcb to malfunction?
    b) What voltage should I expect to see across this LED?
    c) Is this type of LED readily available in RS, maplins etc

    Thanks


Advertisement