Question about Vizio GV42L 42 in. LCD Television

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Vizio GV42L I have a GV42L - After it has been off for extended periods of time (8 hours or more) I try to turn it on and it powers up without a display. I turn it off and back on again and everything is fine. Any ideas on what this could be?

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  • Gary Cherwinski Apr 04, 2008

    I called Vizio support already. They were less than helpful - told me to take it to a shop to have it serviced.

  • Gary Cherwinski Apr 04, 2008

    I am very experienced in taking TV's apart and component soldering/desoldering. Based upon the time it would take to troubleshoot, it's not worth it to bother going down to that level since a whole new power supply is only $40 for this model. All I was hoping for was a solid answer from someone who has experienced the same issue with this set as Vizio's typically have a distinct and inherent set of problems across the board from what I've seen. I have repaired a dozen Vizio TV's and the problem has always been the main board - overheating issue. This is the first one I have come across that the main board wasn't the problem.

    I suspected the power supply however I didn't want to rule out the backlight - hence the reason for my inquiry. I have ordered a power supply and will post the results once I install the new one.

  • Gary Cherwinski Apr 13, 2008

    The problem had nothing to do with the power supply or any components therein. I replaced the power supply and the problem remained. I then replaced the main board and the problem was resolved.

  • Gary Cherwinski Apr 13, 2008

    As per my earlier comment. The problem was not power or fuse related. It was the main board. I solved the problem myself. Thanks.

  • Gary Cherwinski Apr 13, 2008

    Based upon research and scouring the Internet, I went with the mainboard because Vizio TV's are all over the place and their biggest problem seemed to be the mainboard. The only reasons I could find were heat related... Apparently Vizio sends their authorized servicers dozens of mainboards and that is the first thing they are supposed to try when servicing their TV's. Now I know why their referred to as "disposable" TV's.

  • Anonymous Apr 20, 2009

    When turned on after a longer period (overnight) it has only sound (black screen). Turned off and on again, works fine...Problem going on for 4 months now. Bought the TV almost a year ago.

  • rrackley Apr 27, 2009

    Great post!  Our GLV47 Vizio 47" LCD just went out this afternoon.  Just went black all of the sudden with no sound.  The only way to turn it off is to unplug it.  Only a year old with normal daily use.  I am very good with all sorts of electoronic repairs and I'm certain that I can repair it myself.  However, where can I get a replacement mainboard for this set?  Also, have any idea how much?


    Thanks a bunch, 
    Robert

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May be 1.5 surface mount fuse on Main Board. There are three. Check also for cold solder joints on the fuses. BEEATCHES!!!

Posted on Mar 26, 2010

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May be this might have happened due to the overheating of the transformer ...

Posted on Apr 13, 2008

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Sounds like the capacitors may be bad, maybe the amount of power to start the tv with at first isn't enough for some reason and then there is enough there the second time to start up the picture. That's where I would start first. Let me know how they check out and we can work on fixing this from there.

Posted on Apr 13, 2008

  • Benjamin Patri
    Benjamin Patri Apr 13, 2008

    ok, just read your last two posts, I see now that you say it was the mainboard which would've been the next place I would've checked. Do you know why the main board had this problem? I am just interested. Thanks, please let me know

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Have you try to check the fuse on the powersupply & the fuse on the non-powersupply area..?

Posted on Apr 13, 2008

  • micromaster
    micromaster Apr 13, 2008

    I see... Got no mistake with that for sure... You already replaced the whole board., & no more worry.. cause it carry...



    Enjoy

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Some power components might be starting to fail slowly, becouse it seems it takes time for it to 'charge up'.

how to fix it? most likely some capasitors and other parts might need to be replaced.

Can some other expert confirm this for me? Im not fimiliar with this tv model.

Posted on Apr 04, 2008

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  • Ekse Apr 04, 2008


    Vizio technical support



    E-mail: techsupport@vinc.com

    Tel: (714)668-0588

    Hours of operations:

    6:00am – 6:00pm PST Monday – Friday

    10:00am – 2:00pm PST Saturday – Sunday

    Please have your VIZIO model number, serial number and date of purchase available before you call.

  • Ekse Apr 04, 2008

    well cherga I'm sorry to say, if your not trained or have knowledge in takeing a tv apart and useing a soldering iron to remove components from a circuit board and replaceing them if they are the problem.



    Then I have to suggest you find a local service center and take it there.



    There is a service finder on fixya front page

    www.fixya.com right under the top experts.



    Theres not much else I can suggest, expt for a full reset to restore the factory defaut settings, but its likely it wont fix the problem.

  • Ekse Apr 04, 2008

    Alright.

  • Ekse Apr 13, 2008

    Good to know. thanks.

  • Ekse Apr 13, 2008

    I suggest you get yourself a refund from fixya then if the problem is solved. Some other expert will probably now post here looking for the left over cash.

  • Ekse Apr 13, 2008

    I told you!! there we go, if you dont get a refund this guy is going to get payed for noting! :-)

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One step closer to a component level repair:
Okay, I have had this problem and since I am a tech, I took my set a part last night for investigation...
- Audio hum
- Two shots turn on every single time after 8 hours
- Sound is hard to control (too high then too low)(Average:"14")
- The white Vizio logo dims as the picture comes on

This really seems like a capacitor issue getting old or with leaky electrolite issue.

- The solders on the power supply board were pretty good after 2 years of daily useage. Quality of the board assembly is quite good. It's not a cheap *** China shop quality.

- The hardware on the main board is quite impressive with 2 BGA CPU's, RAM, Flash, SMS on multilayer PCB... Again good quality there.

Now here is what I found... on the right side in the section near the sound IC: a major drip of junk (capacitor electrolite) about 3 inches long. I cleanedup the mess with a brush and solvent since this stuff is conductive it can short out signal. I could NOT find any evidence of a capacitor leaky pins or bulked-up top. The drip was in a clear spot with NO parts eventhough there are a whole lot of caps about 1/2" away.
Resoldered couple power transistors and reassembled the TV and test: Problem was still the same. Cleanup not enough!

So I am good to take the set a part again and concentrate on finding a bad cap in the audio section. I guess I will just start replacing a hand full of caps. Too bad I don't have the schematic to trace all the caps used to smooth out the power supply riples. Another way to go may be to find out which cap is getting hot under power because it is shorting out the power (+5 or +12). Wherever is that bad boy it is not used in signal processing.

Furthermore, the bad cap may have died because it's voltage is too low compared to the power riples (lot's of riple caps on the PS board already but perhaps too small: 2,000uF-35V radial should do).
By the way there is a Vizio service manual out there but it's worthless without schematics. It does provide the complete part list in case of burned/exploded parts.
G/.

Posted on Feb 16, 2009

  • San_FranCA Feb 20, 2009

    stab two a this... I tudied the power supply circuitry. Here is what we on this set:

    - The power cord comes in through a bunch of FCC coils, MOV, fuse etc

    - Then the 110VAC (USA) feeds a rectifier bridge

    - The secondary is cleaned up with smalls caps for line noise (BUT is mising a tank cap 300uF/300V to cleanup the 60Hz riples!)

    - The150VDC is feed to step-up /regulator circuitry (to be friendly with Europe 220VAC) to get 400VAC

    - The 400VAC is rectified single wave with one fat TO-220 diode

    - The 400VDC is feed to 180uF tank Cap plus one small cap for noise

    - From there this voltage feeds the power supply primary circuitry through 2 fuses and on goes a classic PWM regulation with opto-couplers.



    So the power supply is dirty because the riples from the 150VDC are nearly doubled then bearly filtered by a tank cap that border line small.



    Let me add a tank cap to the 150DC to see...



    *Warning*: Pls DO NOT get your hands in there unless you know what you are doing around high voltage (400V) TV electronics. What ever you do is soly at your own risk. The above information is non factual and may not be acurate... yadi-yada.

  • San_FranCA Feb 22, 2009

    I added a 470uF/200V cap right after the rectifier bridge but no joy as far the audio hum vs. brightness settings. It's just a bit better as far as the Vizio logo diming less when the set turns on - Ah interesting..!



    Here are the equivalent caps on the PwrSup outputs:

    24VDC 3,190uF in 5 caps @ 35V

    12VDC 3,680uF in 3 casp @ 16V

    05VDC 5,400uF in 3 caps @ 10V

    That seems like fare values for noise filtering plus a few 0.1uF here and there. That looks fine. The audio gets an extra 1,000uF on the DTV board as well.



    Here is something else: the 12V and 24V share the same transformer only on different coils - That explains why the audio hum varies with the curent drawn on the 24V for the light tubes. My next stab is going to be increasing the tank cap on the 400VDC that drives this transformer. Right now we have only 180uF on a single diode rectifier ie. the more current the more noise because the tanks gets drained more between two positive waves. So long story short... double or triple that cap (these 450V caps are not cheap) for less noise and spikes. I don't have any laying around now, I need to order one.



    PwrSup specs are: 283W max: 8A/24V + 5.5A/12V + 5A/5V quite beefy outputs...



    A lot of people have issues with Vizio sets, I suspect the main board gets spiked by the noise on the 12V/5V. So if you change your main DTV board it may be okay for a while until the same cause drives the same consequences and the board goes again... The DC voltage regulation works the average but can not smooth out the noise.



    On the lighter side, lots of folks swear on expensive power conditioners to clean the 110VAC... well this TV makes it's own noise and spikes internally. GV42L DOES HAVE couple MOVs built in the PwrSup for surge/thunder protections.

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http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
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