Vizio GV42L GV47L FHDTV10A No Backlight, No Digital Tuner, Locks Up,Wont Power Off

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Vizio GV42L GV47L FHDTV10A No Backlight No Digital Tuner Locks Up. Involves replacement of an open fuse and IC regulator in power supply circuit of main board.

[@dmccall4394]

I'm a Professional Engineer with 24 years of experience. I put myself through engineering college as an electrician. I have done a lot of basic electronic repair thru the years and I can tell you this - you, who made this video, are very professional at what you do and I was pleased to watch your expertise in action. Not to mention, you helped me repair my Vizio. Thanks so much!

[@Poweigian]

Success!! Found the bad fuse and ordered 3 replacements in case I messed things up. As my soldering skills are beyond rusty, I cheated and soldered a piece of wire to each end of the new fuse, and soldered the other ends to the original fuse. Powered up and shut down with no problems. Without your video the TV would have gone to my local electronic/hazardous waste site, instead it will be put to good use. Thank You!!

[@bigdog8882]

Ive been working on tv's for 20 years and for the problem with backlights but no display and no power off I've been ordering the entire main board. Thanks for the lesson. Now I can save myself and my customers some money. Also love those videos on repairing those sony optical blocks. Thanks again. Rob (BigDog TV & Electronics) / Chicago

[@curtdavis9609]

You are the man! I am an old tech-turned-engineer, but without your video I would not have had the confidence to fix my 47" Visio. You saved me a bunch of bucks! I was fortunate that mine only took the fuse to become fully operational. I only have a pencil tip iron, so I was unable to unsolder the bad fuse, but I just piggybacked the new one and I am back up and running with a $1.15 part! Giving us the DigiKey part numbers is extremely helpful! Thank you so much for your help! My only suggestion for improvement would be a companion video about exactly how to break down the case and where each type of screw goes where. Since there are so many screws and this thing is so heavy, a noob might fix it, but then break the TV by handling it, supporting it, opening it or closing it incorrectly. Thanks again!

[@icaremore]

I know it's been some time since your original post, but I wanted to say I agree with your sentiment about keeping more of these out of the trash. And in general, most electronics. Mines and there contents are finite resources and soon enough they will be mining old trash dumps for discarded boards from every type of appliance made. Thanks for making and posting! Replaced fuse in my 2007 Vizio and it's 10 years old. I like new and shiny tech as much as the next guy but I dislike waste and love getting things back in service.

[@NunYa953]

That TV should be in the Smithsonian! It's the longest lasting Vizio on Earth!

[@CRChannelurl]

Thanks for the video. I found this TV in the dumpster, and all it needed was the exact fuse pointed out in your walkthrough!

[@disposablehero43]

Norcal715, you are amazing sir!! i was a little intimidated at first, having never soldered anything. but i ordered the parts and managed to fix my TV for under $20!!! you're the man!!!

[@drivedenali]

Norcal this is my exact TV and this is my exact problem, head off to by a volt meter and Solder! - Thank you so much for sharing, man I appreciate it!!!

[@timwgeary]

Thanks Norcal715 your video helped me fix my TV just in time to watch the Kings game. ;-) I could not bring myself to pay $120 to have $10 worth of parts shipped overnight Saturday delivery, so I improvised. I bought a 1.5A fast blow glass fuse, soldered leads to it and shrink wrapped it. Then soldered the leads to the surface mount pads. I had planned to have this be a temporary work around but it looks and works great. Thanks Again Norcal715 you are doing great work!

[@lazlan6187]

Because of your very helpful video's (consider myself a very knowing amateur) I found the bad regulator on mine (same model) I only had a orange Vizio light no power whatsoever except standby--it was a U5 regulator(adjustable)--thank you sir-14 cents later (free to me tv) my friend is enjoying his new house warming gift-cheers!

[@Rayoshaq]

Great Video, Just Used it to fix the problem on my Vizio, Saved me a ton of Money on a repair bill. Thanks

[@adriannava9313]

Sir you are a great teacher i'm learning alot from you'r videos great god bless you.

[@asifrana5392]

Sir your teaching, voice and method are very nice

[@krksmth26]

Hi Norcal, I can't tell you how thankful I am that you make these videos so easy to follow and understand. I really appreciate that you take time out of your life and share your knowledge for free. I have one question in regards to the video on the Vizio GV47LFHDTV10A. Your fuses(from rt. to lf.) a 1.5A, 4A & 3A but mine are 1.5A, 1.5A & 3A. Any idea as to why they would be so different? Could the overall low amperage be an additional problem. I've had this tv for 6yrs. and this is the first problem I ever had with it. Thank you for your time and take care. Kirk

[@echo4792]

respected sir NORCAL715 you know you are the man have a great mind and great teacher.thanks god of having you here in the social media to teach us and reveals the solution in terms of hightechnology today. i hope youre always good health in a journey of making videos to solve the problem in technical.extend my regards to your family and friends.MABUHAY.........

[@jos973]

Fixed my tv with a $1.24 fuse. Thank you! Hopefully it lasts a while longer.

[@mondushi]

Greetings fella.... I like the workbench you've made to work on. It's great from the professional stand point. Keep up the good work. thanks

[@jersey123rich]

I have no ability to solder anything, but I've already pulled the back off this same set and I'm certain I have the ability to change a board or two without any difficulty. While I don't have a digital meter, I do have a basic voltage meter. That said, I can tell you that when the set is plugged in the amber keypad lights come on, and if you press the power button the set clicks as if to turn on, however the screen does not light up, there's no sound or blue screen, nor will it power off by pressing power again, you have to unplug it to turn it off. Using my voltage meter I get readings only on the left side (cold side-i think you called it in another video) of the power supply and the center part too, but not on the right side (hot side) under the metal bracket where there are large capacitors and no power present on the pins that go to the wiring bundles that fan out to the main board, master and slave boards. And I get no reading on any other boards at all. I should mention that when the set failed it made one light popping sound. I see no bulging or ruptured capacitors on the power supply board like you mentioned in another video or on any of the boards for that matter. I took off the power supply board and see no signs of scorching on the underside either. Long before the TV went out the digital tuner went out, but I didn't discover that until hurricane sandy hit me on the Jersey Shore and the cable was out for several weeks. At any rate, to me this seems like a power supply board problem and changing that out for $45 on eBay seems worth it, but I'm unsure given that the amber lights do come on. In your opinion might this be a main board problem instead or does it seem like I should start by swapping out the power supply board? Thank you for your videos, time and effort and for any help you or others reply with.

[@hambacon5551]

Great video! I have muliple boards with a faulty digital tuner, but the regulators all check out including the large one at DU1, what else could be the cause?

[@TigredelMar]

I need to replace some of the fixed regulators, any idea what the Digikey part number for those might be?, also, if its not MARKEDon the board with ADJ id not adjustable correct?

[@mightymen8326]

hello i have the same tv for repair,backlight but no video.when replacing the mb i notice a wire on the lvds cable is cut. i solder the cable ,still the same issue with replacement board.Are these cables not meant to be solder?

[@lazlan6187]

I happen to have a GV47L with a no power problem,yellow logo and thats all,PS test 100% good,yes it has a touch pad for power with no results touching at all,any leads on which regulator to start with?,I have all (new) and waiting for the adjustable reg's to arrive-tested voltages on regs,but as I saw in your other vid's some get power from a "root" regulator and cant figure which one it is--thank you,you're "the man" (ps-NO bulging caps),if I lived any closer to your shop I would be begging for an apprentice job to learn more.

[@oakriverdesign]

Great Video! I guess I got lucky, that 1.5a fuse got mine working again. Thanks!

[@mustangsteve1304]

Thank you for the lessons, they are so helpful. I have a 42" vizeo that has this exact problem, powers up but no backlight and wont turn off. I have a bad regulator it has a low output. My board only has 2 fuses instead of 3, one shows 5 volts and the other 12 volts. As I was checking volts on a larger regulator, I arched it and blew the 12 volt fuse. The back light now comes on and I can shut the tv on and off, but there is no picture. I'm going to replace the fuse and regulator, hope it works

[@p7k3]

What do you use to see the fuses & regulaters cuz they are very small n soldering gun has to be fine tip

[@puppetsandfunwithlittledav1512]

Love your video's! Your are a great teacher, and a fantastic tech. You mentioned the resistance on the adjustment pin being 1 ohm, so it was shorted to ground. What should the normal resistance have been on that pin?

[@jestier1]

excellent instructions sir,,i have a 42" vizio that has green screen issues. Black border is bright green as well as some picture colors. Believing it to be a Video Driver card. How do i identify the board in the unit and diagnose the problem?.

[@norcal715]

I always do a complete check out and as in this one as I was programming channels this set didn't capture any digital channels. Also the customer had indicated he was having problems in the past with not receiving any digital channels. Some problems are just too expensive to repair so at the customers option it is just left as-is. Thanks

[@p7k3]

Norcal715 I have same problem with my TV what kind of meter do I need can it be any multi meter or does it have to be true rms & can you give me readings you got on fuses & regulaters so I can compare them meter I'm gonna get

[@JeremyBear]

I've replaced the 1.5 fuse on my set twice now in the past four years, any idea what may be behind the fuse being blown? Initial startup power draw? Seems like 1.5 is a pretty narrow window to work within... Thoughts?

[@BigEightiesNewWave]

I heard him say they designed it with too low rated of a fuse. Inrush current can blow it. Go to a 2Amp probably good/safe.

[@danjenlilyful]

Hey man I love your videos! I have watched them all and just amazed at how smart you are! I have got all the ebooks I could find on TV repair from Justane long and was wondering since I live close in Oregon do you take on apprentices? If so I would love to do that and learn! I'm very smart already and know quite a bit! Please let me know! Thank you and wow I'm sure you hear it all the time but your one smart dude! Self taught, Army, or school?

[@brianbilodeau5621]

Love all your vids. I have a Vizio vu42l fhdtv10a. I have all the proper voltages on the main board/ Power supply and pins, when the left inverter boards is unplugged. When I plug the inverter board into the power supply, my output voltages are non existent. The CAPS on the inverter board look fine. ???

[@garytrombley]

Excellent video. i just tested, and it have a bad fuse no. 3. Hope that is all that is wrong with it. Thanks!

[@atilanotiago8728]

I have the same model, the orange light is on but touch pad lights wont turn on. if the touch pad was the problem can it be replaced of fix or how do i find the problem? btw excellent video, great image quality and great explanation.

[@ubuntututorials]

So, as a repair technician, do you fix just the described fault, or any other faults with the TV?

[@norcal715]

on the fixed voltage regulator ic's the adjustment pin is grounded. on some of them they use a resistance divider network to change the voltage.

[@kwanklan8652]

I tested the voltage req and the output volts are 1.25 so I think it is ok but it still will not search the digital tuner. Anything else to try?

[@dmccall4394]

norcal715 - Skilled people like you will be the core that just might save America from her current downfall. Blessings always.

[@p7k3]

I checked the fuse you removed with my tester which is not a multi meter its a fluke electrical tester has continuity selection it beeped which indicates its closed but when it comes to testing voltage my meter doesn't read your voltages so I need to get a multi meter to check which one is bad can email me

[@thomaswil8]

I can also confirm that U5 voltage regulator goes bad on the GV42L. Quick fix is just use a lm317t in its place. They can be found at any radioshack.

[@jda1231000i]

Friend I check on the back of the panel and I didnt see any light ... is it a bad ?

[@thangamajig]

My elderly father has a small Vizio in his room. We thing it may have been hiy by a lightning strike. It seems to come on and I get back light some times. But no initial Vizio screen or snow or sound. Any advice.

[@jda1231000i]

Hi friend I need your help.... my tv Vizio has a good sound , but the screen is black .No picture , no menu appear in the screen .. what do you thing is the problem? thank you

[@KEH428]

Hey! i really want to thank you for your very informative videos. But wanted to ask you something im still very confused about. My brother in law gave me a Vizio gv47l tv. But when i turn it on it has horizontal lines on the screen, but looks more like a wavy picture and flickering one. Any idea what part i need to change? The main board inverter slave board t-con board Please let me know what you think. Or what i have to do?

[@bomatdaman]

Very well done instructional. Thanks for sharing your knowledge!

[@jpmktgraphics]

Hi, I have a Vizio M470NV, there mas a lightning outside of my house while I was watching a movie, then my tv went off, and didn't turn on again, the orange vizio logo lights up (orange color) then fades to orange NOT SO BRIGHT and the logo comes and goes, I spoke with customer service and the girl I spoke to sounded like she was reading from somewhere and said the backlight was not working. Do you think this was a power surge? any way for me to determine what is not working any chance I can fix it? thanks a lot for any info you can give, thanks James

[@Rangerman9404]

Where are you grounding your volt meter for the regulator tests? You don't show or mention this in the video

[@MarLouie]

Thanks for the video it was very insiteful. However I checked all the fuses and regulators and they all seem fine but the tv is still not working. Any other things I should check?

[@norcal715]

The meter is a true rms but that does not apply to DC voltages it only comes into play when measuring AC, and as far as checking fuses either they are good and have continuity or they are open. as far as checking the regulators, there are too many variables involved in explaning how to check them all. as far as seeing I just use a good pair of reading glasses, and yes a fine tip. Thanks

[@dannytinsman7716]

I have the same make, model and made the month and year as yours. I came home and went to turn on the TV and the control panel lights were on and I could not get a picture. I pulled the power plug and that was the last time that I could get the control panel lights on. After watching your video post I tried to fix it but after testing the fuses they all tested good so now I don't know what to do. Help.

[@DylanZ283]

Hello, What voltage value should we get on the large 3 pin regulator output on the left side of the board right above the cable input? - Thank you

[@DIYApprentice]

I have a Vizio VP50 HDTV20A plasma with a blown 8A fuse. I replaced the fuse and the TV is functioning normally again. I've read that one of the two 8A fuses is prone to blow in these TVs. Do you have any idea of a typical failure point that would cause a blown fuse in these TVs, or is it just that cheap fuses were used?

[@israel55555ful]

hello vizio gv42inch got picture no problem sound keeps going out and a buzzing loud nouse would please help on this matter thanks

[@scrapatyscrapper1343]

i have a VIZIO GV42L FHDTV10A after plugging in all the comes on n lights up is the vizio logo at the bottom of the tv

[@riceandpotatoe]

Your videos on the Vizio TVs are great. Have you had many Vizio TV suffer from freezing up while the TV is on? I have come across several TV of this series that would freeze up. Power cycling the TV will temporary fix the issue but it would happen again with no set time. So far I have a 37 inch and a 47 inch suffering from this problem. I know it is related to the main board but not sure what is causing this freezing up. Is it a firmware issue or defective flash memory chip?

[@calliephillips2046]

Woo! Thank you for this, it fixed my TV picture under all inputs, only now there's no sound on any input I've tried. The speakers are ON in the audio settings under the menu settings, but I'm not getting anything. Do you know what the issue could be? Because it's not working on ANY input at all, it leads me to believe it's a fuse or something like that.

[@CrepesAndCorks]

norcal715 your videos are excellent. I am trying to fix the exactly same model with exactly the same symptom of this video (Vzio GV42L fgdtv10a) All the measurement are you are explaining in this video are ok as far as i can tell so still not sure where my problem is. From one of your other video 'Voltage and troubleshooting" you mention pin 13 &14 to converter box. I do not have any current on those pin. Could this be the problem? If so, i do i fix this? Is there one of your amazing video telling me how to do it. I will love to keep my Vizio out of a landfill. Thank you! If you are located in SO Cal you can even make another video out of my TV ;-)

[@bobbyk6585]

Great video.

[@thomaswil8]

Been waiting for this one

[@roge715]

my tv when off after some weird sound, now is not working, the logo in front is yellow like normal, but cant turn the tv on, the touch pad is not working also the remote controller is not working, i try to turn the tv on using the remote but nothing, i wonder what it can be the damage part, the power inverter, i will open and check this tv tomorrow

[@paulguay2710]

I lifted the trace when removing the 1.5a blown fuse (poor soldering skills) Can you tell me which two components on the circuit board are connected by this fuse so that i can wire it in and salvage the circuit board.

[@tonybua4321]

+Paul Guay I did the same thing, where you able to figure it out? I tried to bypass the fuse by creating a connection directly to where the lifted pad was but the tv wont even turn on when I tried that.

[@jody3moon614]

Hey, thanks for the great videos. I'm working on the same model TV featured in this vid. When plugged in, the logo turns orange, but the touchpad is unresponsive. No visibly damaged parts. Fuses on the main board are good. Fuse on the PS is good. 5v leads from the PS are good. 12v leads from PS are supplying significantly less than 12v. Any suggestions would be much appreciated.

[@jake3588]

Did you ever figure this issue out? I’m dealing with the same thing right now

[@kelvinfeliciano]

I thought that in order to check resistance, you need to remove the power from the unit...

[@abelvasquez7165]

Hello what kind of solder do you use?

[@westlandwildcattv]

THANK YOU FOR THE INFO , FIX THE TV

[@terrazasvideo]

FIXED IT! Thank you

[@katnru2]

Where can that stand be bought?

[@MasterNiva]

what do you think about vizio Brand?against Lg Samsung etc

[@israel55555ful]

hello are you located here in california

[@peterpurple5324]

Good video, easy to listen to. Subscribed

[@firozkamarudin]

I have a samsung 32 inch LED ...keeps while viewing the unit by itself starts switching to AV and component back and goes black and comes to right track again this problem is intermittent and comes and goes in say after 12 hrs and some times unpredictable !!!!

[@ricoelectronico]

gracias gran aporte saludos

[@geojor]

thank you for this...

[@chloeanimalsandgaming6604]

Great video, Thanks !!!!

[@mdicko21]

hi i have no backlight on my vizio E420VSE and i need help.Anyone?

[@azedinederadji6417]

great video and thaks ....

[@alvinlamb6168]

great video

[@electron7564]

hello sir I really like technical repair your videos could help me where I can take online training courses will greatly appreciate greetings.

[@mayanktank2864]

my tv tuner card umax 5821 in no video repair solution's

[@norcal715]

awesome thanks

[@buhts13]

hi, my tv wont work the hdmi

[@nordwinds2561]

you realy good

[@abgduta8254]

why u always change the ic...evry single video.

[@TheJavaSync]

More videos, sir :)

[@norcal715]

More on on the way!

[@madforit9661]

hi

[@thecentralscrutinizer5105]

I'd drop a 2amp fuse there....but thats just me...

[@BATMEX44]

ebay kit here: www.ebay.com/itm/153281331083