Hi! Well, the orange standby light comes on and changes to white on power up. I can't see any backlights at all. The PS board fuse checks good as well as the two SMD type fuses near J1. The unit will power off, making me think it may not be a U33 failure. All the mainboard caps are Tiacon and CE3 has a corroded cap. My question is, should I pull the mainboard and replace the cap OR check more voltages before continuing? Noob question, sorry.
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Re: Vizio VW37LHDTV10A no backlight
Pictures of the whole back side of the TV and the boards.
We need to find out if we have 24VDC, BL_ON signal or not.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=24809 -
Re: Vizio VW37LHDTV10A no backlight
Ok. Here we are. Thought it was unusual that the "CPU" had no heatsink.Attached FilesLast edited by Brian with a/b; 12-14-2014, 07:53 PM.Comment
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Re: Vizio VW37LHDTV10A no backlight
So you need to check the signal pins on the power supply board when TV is OFF and when TV is turned on:
PS_ON pin.
A pin
B pin
C pinNever 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 VW37LHDTV10A no backlight
Sorry for the slow reply. In standby they all read zero, ON they were PS_ON 3v, A 2.6v and B .03v ; as far as I can tell.Comment
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Re: Vizio VW37LHDTV10A no backlight
Also, none of the pins on the 24vdc plug read anything close to 24vdc.Comment
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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 VW37LHDTV10A no backlight
1.5vdcComment
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Re: Vizio VW37LHDTV10A no backlight
OK, we need to find out if the PFC Voltage booster circuit is working or not next.
You will have to be real careful since you will be making measurement in the deadly PRIMARY side of the circuit. You will be measuring the Voltage RIGHT AT THE TWO LEGS OF THE MAIN FILTER Cap, it is the big cap laying on it side, it should have about 160VDC when the TV is not turned on and then it should jump up to >360VDC when power switch is activated and the main board sends out the PS_ON to turn on the PFC Voltage booster circuit and the 12V/24V Power supply section.
Do not let your hands or body touch anything on the board.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 VW37LHDTV10A no backlight
167 in standby, 165 with power on.Comment
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Re: Vizio VW37LHDTV10A no backlight
OK, that is why you are not getting the 12V/24V because the 12V/24V power supply section requires that boosted Voltage to run.
You may want to look for another power supply board from shojimmy at this point, to fix to component level is not going to be easy dealing with SMD parts.
Beside this power supply board, we do not know if all the regulators ICs are all good or not on the main board until you get the power supply running first.
Power supply:
http://www.shopjimmy.com/vizio-0500-...upply-unit.htm
He is having 5% of for December.Last edited by budm; 12-18-2014, 12:23 AM.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 VW37LHDTV10A no backlight
Alrighty then, I will get a PS. Thanks for the help, Mr. BudM.Comment
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Re: Vizio VW37LHDTV10A no backlight
I replaced the power supply board and it's doing pretty much the same thing as before. Any ideas?Comment
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Re: Vizio VW37LHDTV10A no backlight
PS_ON is still at 3VDC? The voltage on the main cap still did not go up to >360VDC?
Did you get the board from SJ?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 VW37LHDTV10A no backlight
Yes, still 3vdc, no change on main cap, EbayComment
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Re: Vizio VW37LHDTV10A no backlight
Got one coming from SJ.Comment
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Re: Vizio VW37LHDTV10A no backlight
The one from SJ isn't working either. The power board is not the problem.Comment
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Re: Vizio VW37LHDTV10A no backlight
ok, did you try just unplug the connector for bl-on, see if the backlights come on?Comment
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Re: Vizio VW37LHDTV10A no backlight
go ahead n change the corroded cap, what can it hurt?Comment
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Re: Vizio VW37LHDTV10A no backlight
If you have PS_ON but no boosted Voltage on the main cap, then the power board is still not right, there is nothing else that the power supply will need to get the boosted voltage.
You can run the power supply board by itself and use force on signal on the PS_ON pin.
http://s807.photobucket.com/user/bud...?sort=3&page=1Last edited by budm; 01-03-2015, 10:20 PM.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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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... -
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... -
vizio e650i-a2 (LWJAOZBP Serial) led backlight flashes then turns off, has video (via flashlight) and audio.
panel: au optronics T650HVN05.4
72 led total on 12 strips, 6 led per strip wired in three groups of 24 (led driver board has three anode and three cathode pins)
link to datasheet: https://datasheetspdf.com/pdf-file/8.../T650HVN05.4/1
Vizio 56.04219.641G (liteon PA-3231-01WN-LF) Power Supply Unit
https://www.shopjimmy.com/vizio-56-0...-power-supply/
Vizio 55.75J01.001G (91.75J10.004G) Main Board... -
I have a Vizio M70-D3 4K with a dark spots backlight issue. It is using the Y8387248A backlight driver board.
On this model each of the 64 transistor powers 2 LEDs. Using my TKDMR TD3H backlight tester I've determined that the backlight LED strips were the issue, and the backlight driver board was just fine. Some LED pairs required 5.9 volt at 155mA, some required 9.5 volt and some were completely open.
I've removed the LCD panel and once the LED strips were exposed I've tested them again by connecting my LED tester directly on the test pads. To my surprise all, I've... -
Hello, guys!
I have this Westinghouse 32" LCD TV that turns on, standby led lights up (blue) but no image. If I knock on the screen there's no backlight present. I took the back cover off and injected voltage on the led connector using a Led TV Backlight Tester, and no light at all, so... it must be that there's some bad Leds, right? Or there is some another testing that should I have to do? Any guiding I'll appreciate it very much. Thanks in advance!
Alex....
Comment