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Walker TV problem

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  • 12-02-2015 11:32pm
    #1
    DylanC431
    Registered Users Posts: 22 ✭


    Hi, I was wondering if anyone could help me here, I have a Walker WP3210LCD 34" TV that's getting on for 6 year old now and for the past while its been having a fault where when you switch it on all you get is random colours cycling for between 10 and 30 minutes (and now its just dead). I've troubleshooted this down to 1 of 2 things
    1: a thermal issue with the LED's
    2: a PSU issue

    I was wondering would it be worth getting the spare parts or would it be better to just get a new TV altogether, unfortunately though, walker don't do 34 inch TVs anymore so... Where to next?


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    #2
    CountyHurler
    Closed Accounts Posts: 8,657 ✭✭✭CountyHurler


    Hi Dylan,

    I fix TVs part time, so I'll tell you what I think..
    its been having a fault where when you switch it on all you get is random colours cycling for between 10 and 30 minutes (and now its just dead).

    On any TV that I get to look at, I check the Electrolytic capacitors on the PSU first. They are HUGELY prone to failure. Have a look at the side of the PSU that is opposite the end where the three pin AC connector plugs in. You will see a number of these..

    cap-pic-640x590-1340838424_500_461_75.jpg

    ^ That is what a new one looks like. The top is perfectly flat

    2010-09-03_072627_2010-07-19_161942_bulgingCap1.jpg

    ^ This is what a bad one looks like.. the top of the capacitor is bulging.

    If you want to take a few good high res images of the capacitors on the PSU, I'll have a look over it...

    I'm not saying that this is definitely the cause of the fault, but it's the first thing you need to rule out before putting time in to troubleshooting the other parts of the TV.. Much like if your car wasnt starting, you would look to the battery first. Of the last five TVs I've had on my desk, three were fixed by re-capping (replacing the electrolytic capacitors on the PSU board).


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    #3
    DylanC431
    Registered Users Posts: 22 ✭DylanC431


    CountyHurler wrote: »
    Hi Dylan,

    I fix TVs part time, so I'll tell you what I think..



    On any TV that I get to look at, I check the Electrolytic capacitors on the PSU first. They are HUGELY prone to failure. Have a look at the side of the PSU that is opposite the end where the three pin AC connector plugs in. You will see a number of these..


    ^ That is what a new one looks like. The top is perfectly flat



    ^ This is what a bad one looks like.. the top of the capacitor is bulging.

    If you want to take a few good high res images of the capacitors on the PSU, I'll have a look over it...

    I'm not saying that this is definitely the cause of the fault, but it's the first thing you need to rule out before putting time in to troubleshooting the other parts of the TV.. Much like if your car wasnt starting, you would look to the battery first. Of the last five TVs I've had on my desk, three were fixed by re-capping (replacing the electrolytic capacitors on the PSU board).

    In my experience the capacitors split open, but on this TV they're fine, flat... There is what look like 2 "packs" on the board furthest to the right, the bottom pack is buzzing (that could be the PSU though)


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    #4
    CountyHurler
    Closed Accounts Posts: 8,657 ✭✭✭CountyHurler


    In my experience the capacitors split open, but on this TV they're fine, flat... There is what look like 2 "packs" on the board furthest to the right, the bottom pack is buzzing (that could be the PSU though)

    I've also seen perfect looking capacitors with very high ESR causing problems... tbh, from what you describe it doesnt sound like a stereotypical electrolytic cap failure, but it just makes sense to check them first....

    Given that the backlight is on the whole time, the inverter and ccfl bulbs are fully functional... The power supply is also working to power this side of the circuit as well... I would check the voltages going to the main board just to confirm that they are within spec also...

    When you say "packs" what do you mean? Buzzing can be caused by failed diodes or sometimes cold joints on transformers/inductors... If you roll up an A4 sheet of paper and stick it to your ear, you should be able to narrow the buzzing sound down to one or two components...


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    #5
    DylanC431
    Registered Users Posts: 22 ✭DylanC431


    CountyHurler wrote: »
    I've also seen perfect looking capacitors with very high ESR causing problems... tbh, from what you describe it doesnt sound like a stereotypical electrolytic cap failure, but it just makes sense to check them first....

    Given that the backlight is on the whole time, the inverter and ccfl bulbs are fully functional... The power supply is also working to power this side of the circuit as well... I would check the voltages going to the main board just to confirm that they are within spec also...

    When you say "packs" what do you mean? Buzzing can be caused by failed diodes or sometimes cold joints on transformers/inductors... If you roll up an A4 sheet of paper and stick it to your ear, you should be able to narrow the buzzing sound down to one or two components...

    I did that and by packs I mean, 2 little rectangular boxes they have a brown color to them and they're attached to the main board (white isolated board)


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    #6
    CountyHurler
    Closed Accounts Posts: 8,657 ✭✭✭CountyHurler


    DylanC431 wrote: »
    I did that

    You're gonna need to give me more information for me to be able to help you.. What did you do, did you check the voltages out of the PSU? It sounds like it's working but the next step I would do would check that the voltages going to the main board are right...
    two little rectangular boxes
    If you post a picture of the board, I'll try to identify the component.


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    #7
    ZENER
    Registered Users Posts: 6,163 ✭✭✭ZENER


    I don't think he can post pictures directly yet with just 11 posts.

    Given the time taken for the fault to appear I'd be thinking temperature related. Probably dry joints around a regulator or other power component or, as you say, a capacitor losing capacitance or with high ESR worsening with the warm up.

    The brown boxes are probably low value high voltage capacitors in the mains filtering board.

    Ken


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    #8
    Topdolla
    Registered Users Posts: 129 ✭✭Topdolla


    Since there is an expert on here, my walker tv has a blueish purple fade on the top middle of the screen, I think one of the LEDS has gone from that area.

    Is it an easy fix?



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    #9
    avensus 2012
    Registered Users Posts: 6 ✭avensus 2012


    in moved my walker tv which was working fine to another room and since my screen barly lights up and no picture or sound , its about 7yrs old should i send to to recycle or can it be repaired



  • Options
    #10
    ozmo
    Registered Users Posts: 3,845 ✭✭✭ozmo


    Dont know anywhere that repairs tvs anymore, shame - you could give it a go yourself... Its usually the fix below.

    https://www.youtube.com/watch?v=dbvMegp0ATA (or any of the countless vids showing same)

    (Obviously be careful of high voltages and watch out for any large caps that might hold a charge)

    Or maybe donate it for parts or for someone else wants to give it a go on Adverts....?

    “Roll it back”



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