Tv has no picture or sound. the backlight works. I have to unplug the tv from outlet to turn it off. I have another Tv that does the same thing. is this a common problem? I would like to fix it but not sure were to start.
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Re: vizio 42 gv421 no picture/sound
Go to search this forum and type in Vizio, or Vizio GV421 and look at other posts, i myself fixed two vizios recently one was a bad voltage regulator on the main board. the other set had a defective T-CON Board. searching other threads/posts will give you a chance to see what other people have found. but most likely someone else will post some troubleshooting steps to help you diagnose it. Good Luck! -
Re: vizio 42 gv421 no picture/sound
Thanks for the reply! search was not helpfull. I have a multimeter just not sure were to startComment
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Re: vizio 42 gv421 no picture/sound
got the model#wrong should be gv42l. i did find some useful info on hereComment
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Re: vizio 42 gv421 no picture/sound
this dont look good?Attached FilesComment
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Re: vizio 42 gv421 no picture/sound
new to this can someone tell me how to use a mulitmeter to test this?. im very new to thisComment
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Re: vizio 42 gv421 no picture/sound
chip with " green " is that normal? the chips are by Amtel 710 24c028n su18 and Atmel 716 24c028n s018 I cant find any information on these.Attached FilesComment
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Re: vizio 42 gv421 no picture/sound
I think those green and silver spots helped someone to denote pin 1 on the chip. They were replaced, or factory screwOP. You need better focused pictures. Front and back of the power supply board if possible. The whole main board. And a good picture of the whole back side of the TV so that the regular members can see how everything hooks up. I to had a bad voltage regulator on a 42" vizio. It sounds like a main board problem. But could be ccfls. Good luck.Comment
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Re: vizio 42 gv421 no picture/sound
The Atmel chips are eeprom chips, Don't mess with them!Comment
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Re: vizio 42 gv421 no picture/sound
I wont mess with the chips! as i don't know what im doing
I cant see anything wrong.. the caps " look " fine. here are more pictures.. I am having a hard time with my camera. so excuse the pictures.
Attached FilesComment
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Re: vizio 42 gv421 no picture/sound
On those connectors on the power supply, do you see a pin marked 5V (or 5VS, or 5VSTBY), and a pin marked ON/OFF, PSON or STBY?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 42 gv421 no picture/sound
I found 5vsb and pson see image. thank youAttached FilesComment
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Re: vizio 42 gv421 no picture/sound
OK, what is the voltage at 5VSB and PSON when the TV is showing the ORANGE (standby) logo?
Then press the power button. Do the voltages change?
The main board and inverters should be plugged in for this test.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 42 gv421 no picture/sound
there 3.5.. funny i removed the ribbon cable to check then they were 3.0 then i put the cable back they were still 3.0 hopefully i am using the multimeter correctly. no change when i turen the tv off & on. better pictures of mainboard. is the powerboard ac and mainboard dc?Attached FilesComment
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Re: vizio 42 gv421 no picture/sound
5VSB is just 3V? This is a problem. Can you just test a fresh AA battery just in case your meter isn't working right, you should get around 1.5-1.6V.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 42 gv421 no picture/sound
I tested a fresh AA Tested 1.5v retested the pins all were 3.5v ac except for pin " c " it was less then 1v 0.8 if i remember correctly.Comment
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Re: vizio 42 gv421 no picture/sound
Ah did you use DC volts or AC volts? You should use DC volts.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 42 gv421 no picture/sound
"retested the pins all were 3.5v ac" AC?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 42 gv421 no picture/sound
used DC to check 1.5v AA battery. I used AC to check pins on power BoardComment
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Re: vizio 42 gv421 no picture/sound
I just tested it on the DC setting. I'll assume the power gets converted from AC to DC on the power board? 5VSB fluctuated between 1.44 to 1.55v PSON fluctuated between -0.08 to -0.16 and would jump to 0.78 to 0.86 when I turn the power on.Comment
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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... -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
Hi, I have a Samsung UE50TU with:
- sound and backlight, but no picture
- when it arrived, it had a picture for a few seconds
- it keeps rebooting
- without ribbon cable between the two panel boards, it does not reboot but I have no picture
- without cable between mainboard and lcd panel, it does not reboot (but obviously i have no picture)
- when i try a tape fix, its keeps rebooting, unless I tape off pin 1 (the innermost pin). In that case it does not reboot but I have no picture.
- without cable between mainboard and lcd panel and with a jumpered... -
I have a 60 inch Samsung UN60EH6000F flatscreen TV. The screen went black a few months ago Sound is good, backlight is good, no menu. I replaced the TCon board with a used board purchased from Ebay. It worked fine for a 3-4 months, then the screen started ‘fading' back. Once again, sound is good, backlight is good, no menu. However, this time the picture looks fine for about 10-15 minutes, then fades back. If I power cycle the TV, the display reappears, for another 10-15 minutes, then fades black again. Repeatable ever time.
I ordered a supposedly ‘new' Tcon board this time, and... -
Hello everyone,
Ive got a UE60KU6079 on the workbench that is giving me some headaches trying to troubleshoot.
The previous owner stated that there had been white dots on the screen which from the description sounded like some lenses fell of the backlight LEDs.
He had opened the TV from the back, trying to get to the backlight, supposedly gave up, reassebled everything and gave the TV to me.
I expected the worst like ripped COF cables or a cracked panel but could not find anything like that yet.
Anyway I still fully expect that there has been something seriously damaged...
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