A friend gave me this Vizio GV42LFHDTV10A yesterday. I opened it up and found two bad regulators (U7 and U33, adjustable 1117's). I didn't have any new regulators and I'm pretty impatient so I pulled a couple off of a used, damaged board I had laying around. I bought two really cheap HDMI cables this afternoon (see a pattern?). Anyhow, I've been watching the set tonight via HDMI1 input with one of the new cables. Every so often, the screen would go to full vertical green or blue lines and the speakers would pop pretty bad. As soon as I touched the HDMI cable at the input on the main board, the picture cleared up and stayed clear for a while. Eventually, it happened again. I swapped to A/V and had no problems. I pulled the 2nd cable out of the box and plugged it into HDMI1. After a while, it happened again, this time it was horizontal lines, but just like before, as soon as I touched the end of the cable at the input, it cleared up. I've sat here for an hour trying to get it to happen again to get pictures. No luck. I'm going to bed now but wanted to hear some thoughts you may have. I'm thinking it's main board related. Either a bad HDMI input or a faulty regulator. Though I guess I wouldn't be shocked if both cables were bad right out of the box. I'll try tomorrow on HDMI2 to see if the problem continues. Looks like it wouldn't hurt to get a pack of new 1117 regulators in either.
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Last edited by johnboy1313; 03-14-2013, 09:31 PM. -
Re: Vizio GV42LFHDTV10A, Garbage picture, popping noise through HDMI
So, from what I read, it looks like it's common for Vizio's to have bad HDMI ports. I'll try port 2 and also try the XBOX in port 1 instead of the DVD player to see if it happens again. -
Re: Vizio GV42LFHDTV10A, Garbage picture, popping noise through HDMI
Problems with HDMI rarely cause vertical lines. HDMI is a serial protocol and as such, it would be rare for glitches to be vertically sync'd. If I were to look anywhere I'd look at other regulators, and perhaps the main processor itself.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Vizio GV42LFHDTV10A, Garbage picture, popping noise through HDMI
If it were related to the processor, wouldn't the analog inputs be affected as well? I've watched two full movies through A/V with no glitches but saw multiple glitches with two separate cables in less than 30 minutes of HDMI. To be clear, the glitches were very random and quick so my description is more based on memory than anything.
I'm going to order the regulators that I need and change them all. I need to open the set back up and get some pictures and voltage readings. I'll report back tonight.
Thanks for the input.Comment
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Re: Vizio GV42LFHDTV10A, Garbage picture, popping noise through HDMI
Well, the inputs are handled differently. The processor probably receives the inputs directly on its analog input pins, but HDMI will have a dedicated interface.
If the glitches were very quick it could simply be cheap HDMI cables. I thought you were referring to freezing of the image. My Panny plasma picks up occasional single-screen flickers of noise when someone turns on the light switch in the kitchen... that being said, the HDMI cables were only 99p for 2m long... so you can hardly expect the best shielding. They do handle 1080p 60Hz with no issue apart from this. It's not frequent enough to annoy me, but I may have to buy a £5 2m cable if interference is more common when I move into the new place.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Vizio GV42LFHDTV10A, Garbage picture, popping noise through HDMI
This is definitely more than interference noise. At it's worst it flickers between picture, scrambled garbage, and the blue "No Signal" screen. At that point, when I touch the cable, it clears up only to do it again shortly after. I don't recall there being any image freezing.Comment
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Re: Vizio GV42LFHDTV10A, Garbage picture, popping noise through HDMI
This is intriguing. Here's a post regarding practically the same set with a very similar issue involving U7. The only difference it seems to me is that I don't have to unplug mine to get it to shut off, though if I remember correctly, there was a brief moment where the remote wouldn't respond while it was showing the "No Signal" box. At least I have somewhere to start.
https://www.badcaps.net/forum/showth...ighlight=GV42LComment
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Re: Vizio GV42LFHDTV10A, Garbage picture, popping noise through HDMI
I ordered new voltage regulators from Digi-Key last week. I installed new regulators for U7 and U33. We watched the set last night for several hours through HDMI with no issues. I'm hoping this one's done. I'm going to continue using it this week and see what happens.Comment
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Re: Vizio GV42LFHDTV10A, Garbage picture, popping noise through HDMI
It is always a good idea to check the regulators in Vizio, too many regulators failures.
U33 output feeds U7 input.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Vizio GV42LFHDTV10A, Garbage picture, popping noise through HDMI
Do you know what U7 output feeds? My guess (and hope) is something to do with the digital signal.Comment
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Re: Vizio GV42LFHDTV10A, Garbage picture, popping noise through HDMI
What is the typical output voltage?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Vizio GV42LFHDTV10A, Garbage picture, popping noise through HDMI
I'm going off of memory, but I think U7's output is 1.25VComment
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Re: Vizio GV42LFHDTV10A, Garbage picture, popping noise through HDMI
That's a low core voltage, so would be feeding a large processor. Probably the video processor. Run it for a few days to confirm, but I suspect it's fixed.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Vizio GV42LFHDTV10A, Garbage picture, popping noise through HDMI
Cool, thanks.Comment
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Hello, i am working on Vizio M70-C3. It can hardly power on, it takes 15 power button presses or remote. Seems like eeprom problem that I seen before but all reading online says that this tv has power board or main board problem.
When tv powers on vizio V logo shows nice on whole screen. picture 1
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When i start youtube picture shows on left side fine, right is all scrambled. pic 2
When i click video to start playing picture goes black(like when you change... -
Hi I inherited a Vizio M65-E0 that isn't working. It must have been dropped on the corner because I found that the infrared circuit had a capacitor with one end broken off of the board and some green corrosion around the plug to the main board. I re-soldered the capacitor and cleaned the corrosion well and tried turning the M65-E0 on and I was successful. My problem is that while the back lights come on and appear to perform local dimming there is no picture or sound. It kind of looks like you are looking at the TV through a very dense fog, where changing the input on the remote will change bright... -
HI all,
hope someone point to the possible issue before I start buying replacement parts.
Tv starts normal and responds to remote fine, PSU voltages mesured fine 19v was 18.9V under load and 19V with main board disconnected.
Backlight stays on all the time,
Sound works fine.
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Picture looks fine with no visible artifacts.
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Disconnecting left and right ribbons on... -
Hi
I have this TV bought back in 2007 and used it for playing on PS3 for 4-5 years actively. After then it was barely used. It was mostly in stand-by mode or plugged out of mains completely for years. Today when i turned it on i have noticed noise in picture on two different locations of the screen. As you can see on the photos (see attachments) the noise is only in a small rectangle area, and if you look at it closely you see that one noise rectangle area is at the upper left corner of first half of screen, the other noise rectangle area is at the upper left corner of the second... -
Hi,
I have a VIZIO E70-E3.
Symptoms: Black screen, no picture, but LED backlights are working.
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I believe the problem is either a bad T-CON board, or connection to LCD, or bad LCD.
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If both are connected, the screen is black.
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