Vizio E470VL - Lines & garbled image....sometimes

[Diah]

Re: Vizio E470VL - Lines & garbled image....sometimes

Ok, just so not to leave a thread hanging.....
I hate being a 'board hanger'.....but I just couldn't figure this one out....but in the end, it's working and I made a nice profit on it.

yours original MB suffer too from what you changed at the new one.. this why i linked the bin file #26 for reprogramming it self or to new chip.

[Topcat]

Re: Vizio E470VL - Lines & garbled image....sometimes

Good work, $30 to fix the problem is not too bad.

It was a bit of a gamble... Seller said the TV that the board came from didn't work...it would come on and just show the 'VIZIO' logo, nothing more...which is a pretty common issue with this model...but you never know.... It was a success though, one less TV in the scrap pile.

[budm]

Re: Vizio E470VL - Lines & garbled image....sometimes

Good work, $30 to fix the problem is not too bad.

[Topcat]

Re: Vizio E470VL - Lines & garbled image....sometimes

Ok, just so not to leave a thread hanging..... I finally got this one going...the owner wasn't in a hurry and I had other stuff to work on. Anyway, as much as I hate doing this, I just couldn't narrow down what component was causing the issue and I just couldn't waste more time on it....so I found a used board on ebay for $16 shipped that had the 'frozen splash screen' issue (a common issue and easy fix)....so I bought that and the $14 worth of eproms for it from shopjimmy, and we're back in business.

If I hit the outlined area with cold air from the compressor or warm air from a hair dryer, things would go bananas; screen freezes, gibberish, and sometimes it'd even recover and be perfect..... Anywhere else on the board had no affect.



I reflowed and checked components until I was blue in the face, nothing ever tested bad. The LVDS's were fine & clean (I cleaned them several times in the process of diagnosing).

Anyway, old board set aside, and new old board into play. After replacing the eproms, here we are!!

Test patterns:






Now for the HTPC...



NEC test pattern from the HTPC:



...and a movie... Apollo 13 back from the 90's....


The turd board:



I hate being a 'board hanger'.....but I just couldn't figure this one out....but in the end, it's working and I made a nice profit on it.

[Topcat]

Re: Vizio E470VL - Lines & garbled image....sometimes

I diddled with this a little today, slow cold Monday. I got my backlight back. Pinned that down to an open fuse @ position 'TF1', which would be a thermal fuse. I probably nuked that one incidentally, as I was working in that area with the SMT hot air gun and probably buzzed it. I replaced it and the backlight has returned, but with the same garbled image....so back to square one.

[Topcat]

Re: Vizio E470VL - Lines & garbled image....sometimes

how about the picture & sound you still have them on it or also went out with BL.
if you press the metal shield on main boards did the whine sound reduced.?

i would solder out the metal shield .. and try locate the SPI Flash, and the main IC.

i found the SPI .bin file in case if it need later..

No pic, no sound along with no BL.

I had to move it off the bench so I could get other things run through....this one got stuck on the 'get back to' shelf.....but I will report back.

[Diah]

Re: Vizio E470VL - Lines & garbled image....sometimes

I think I killed something in that mainboard. With the set on, PSU outputs are still where they should be. If I power the backlight from an outside inverter, it still lights up. The whine/hiss sounded more like coil whine, not arcing.

how about the picture & sound you still have them on it or also went out with BL.
if you press the metal shield on main boards did the whine sound reduced.?

i would solder out the metal shield .. and try locate the SPI Flash, and the main IC.

i found the SPI .bin file in case if it need later..

[Topcat]

Re: Vizio E470VL - Lines & garbled image....sometimes

LOL who knows ...may be you found the leaking issue we talked on before... it was the BL

I think I killed something in that mainboard. With the set on, PSU outputs are still where they should be. If I power the backlight from an outside inverter, it still lights up. The whine/hiss sounded more like coil whine, not arcing.

[Diah]

Re: Vizio E470VL - Lines & garbled image....sometimes

I think I finished it off.... Set still powers up, but lost backlight now.

LOL who knows ...may be you found the leaking issue we talked on before... it was the BL

[Topcat]

Re: Vizio E470VL - Lines & garbled image....sometimes

I think I finished it off.... Set still powers up, but lost backlight now.

[sigmeyer]

Re: Vizio E470VL - Lines & garbled image....sometimes

Hitting the chip with spray may cause it to go below 0 C which is not an operational temperature for this chip , so that might be normal. But maybe its still the Tcon at fault. Ye this is a tough one. It could be the problem with the screen PCB thingy , i would open the tv and see if there are any test points on that pcb , maybe try to spray on that thing and see if it does anything. If all else fails perhaps try and change the motherboard but yeah , hthats risky.

[Diah]

Re: Vizio E470VL - Lines & garbled image....sometimes

i dont think this LG Display IC the issue.. its effect when you freeze it sent different Freq signal TX to the panel.

[budm]

Re: Vizio E470VL - Lines & garbled image....sometimes

There are some SMD Lytics cap in that T-CON section on the main board, may be you can try pin point cold spray on those caps.

[Topcat]

Re: Vizio E470VL - Lines & garbled image....sometimes

The focus of attention is now this chip/area.



If I hit that chip with the air, the display goes nuts and actually freezes up until the chip warms back up. Never do I get a 'normal' image on the display.

Hitting the CPU (inside the can) has no affect. Neither do any of the tuners/IO areas. It's down to something in that TCON chip area (tcon was my original suspect, but couldn't confirm).

I've reflowed this area several times, it has no corrected the issue.

[Topcat]

Re: Vizio E470VL - Lines & garbled image....sometimes

Maybe its getting narrowed here. Cold air anywhere on the PSU renders no changes. Same with the tab bonds, nothing changes. If I blast the tcon/signal processor board, things happen. The 'garble' changes patterns but never straightens out. Looks like perhaps some reflowing is in order.....but atleast it eliminated the PSU and the tab bonds.

[Diah]

Re: Vizio E470VL - Lines & garbled image....sometimes

i found on net .. service menu from the panel at the tv side press menu and immediately followed with power

[Diah]

Re: Vizio E470VL - Lines & garbled image....sometimes

search after main boards No. not model. Vizio some models belong to other brands..

about cold or warm state it garble. when it start garble plug it from wall socket and plug it on again. if it show clear display then its MFC FW. if it garble then its related to cold & warm of parts

[Topcat]

Re: Vizio E470VL - Lines & garbled image....sometimes

so you are close to narrow the issue, use freeze air spray . starting from secondary circuit at PSU and the T-CON section at main board/nand / eeprom etc.

What's the secret for the service menu though...that one is bugging me. I've never had one I couldn't get into.

[Diah]

Re: Vizio E470VL - Lines & garbled image....sometimes

I've tried every trick I know of to access the service menu....not working. https://factory-reset.com/wiki/Vizio_Service_Menu

FWIW, when it was cold, it displayed perfect for about ~5 minutes....then garble.

so you are close to narrow the issue, use freeze air spray . starting from secondary circuit at PSU and the T-CON section at main board/nand / eeprom etc.

[Topcat]

Re: Vizio E470VL - Lines & garbled image....sometimes

I've tried every trick I know of to access the service menu....not working. https://factory-reset.com/wiki/Vizio_Service_Menu

FWIW, when it was cold, it displayed perfect for about ~5 minutes....then garble.