Re: M550sv
After a bit of investigation I believe the issue people in my shoes are having is faulty backlighting somewhere between the cable to the individual LEDs. I would also like to point out that the buffer board in my m420sv just took a crap there is a main board and a power supply in this unit no separate tcon and both boards are confirmed working lvds cables are good so screen artifacts and freezing looks like timing control issue so much has to be buffer board on bottom screen was inspected well and is healthy so only thing left is the buffer board on the 42 inch. I don't...
infringer
Badcaps Member
Last Activity: 04-11-2025, 10:34 PM
Joined: 09-25-2009
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Vizio Sound Stand
Here is an odd one....
My Vizio Sound Stand which I know may not be hifi and all that such and such but it worked fine... That is until all of a sudden I turn it on and start playing some tunes
then it stops playing and emits a buzzing noise that remains until I remove power from the unit.
This now happens every time after a minute or two of playing buzzzzzzzzzzz until I unplug it. It uses a small 24v power supply hooked to the board there is a total of 3 speakers hooked to the amp board one small sub and two small speakers. There is an IR transciever... -
Re: M550sv
Replaced with a complete kit wires boards and everything included much to my surprise the thing worked for about 2 weeks.
Sold my other tv to recoup some of the costs associated with repairs BAD IDEA!
Last night the TV shut off randomly again could not get it to stay on.
Today it is working fine but I imagine it likely will not last for a reasonable amount of time.
I believe this TV is likely a lemon I don't fully understand the cause weather it is the metal cover on the back causing static issues or something...Leave a comment:
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Re: Samsung PN60E530A3F red sparkles
looks like LVDS cables to me from board to TCON but not real well versed with buffer boards...
Most often you can connect and disconnect the TCON cables to fix an issue like this. I have seen some instances where the HDMI chip on board is the culprit and could very well be the issue.
Beyond this I am not sure just a shot at helping. Try checking all your cable connections make sure they are good reset them after taking each one off.
Sometimes you can use an HDMI to VGA adapter to get around this issue grab...Last edited by infringer; 01-14-2017, 11:30 PM.Leave a comment:
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Re: M550SV Vizio main board repair
yes oddly today I can not turn the TV on after unplugging it and plugging it back in very well could be I just find it interesting two bad power boards that exhibit the same conditions I am starting to wonder if it is a cabling issue.
It did happen after plugging and unplugging the main power harness that runs to the video board maybe I should order another one of these if I knew the pins required I'd likely buy those instead but for now hrmmm I wonder it almost looks like dupont spacing maybe I can make my own harness and try......Last edited by infringer; 01-14-2017, 10:31 PM.Leave a comment:
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Re: M550SV Vizio main board repair
Set sucks I'd sell it for 200 bux at this point and take a huge loss I've replaced the main board 3 times and the power board once as well.
That is all I see with this set no TCON just a main board and a power board very odd I would bet that the good sets were the ones with the TCON and the LED greed driver board and yellow power board because this one won't run if you 3D printed robotic legs on it it boots up I mess with it for a few minutes or so then bingo no picture no sound and the status lights stays lit white. I am starting...Leave a comment:
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Re: M550SV Vizio main board repair
Set sucks I'd sell it for 200 bux at this point and take a huge loss I've replaced the main board 3 times and the power board once as well.
That is all I see with this set no TCON just a main board and a power board very odd I would bet that the good sets were the ones with the TCON and the LED greed driver board and yellow power board because this one won't run if you 3D printed robotic legs on it it boots up I mess with it for a few minutes or so then bingo no picture no sound and the status lights stays lit white. I am starting...Leave a comment:
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Re: M550SV Vizio main board repair
Where is this firmware flash chip on the "net" ?Leave a comment:
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Re: M550sv
odd thing replaced my main board and power board still having power off troubles would be most excellent to figure out what is the cause of this issue. My old board I could get it to stay running for longer periods of time sometimes hours using a VGA to HDMI adapter running on RGB input. But eventually it still shut off.
Still no luck going to replace the timing control board and see if anything gives at this point I am having a whale of a time figuring this one out and doing so in my spare time which is very sparse lots of projects going on solar/wind farm...Leave a comment:
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Re: Vizio m550sv shutting off after boot up
I am fairly sure there is no one capable of figuring this TV out I have replaced everything with new parts in mine except for my Timing control board I am about ready to order that and if it doesn't work I may just make a video of me bashing it in with a baseball bat and post it on youtube and see how many hits I get for the heck of it.
I could have had a couple of decent tv's with the money I spent on this thing.
TV
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Re: M550sv
Oh yes totally understand thx for the reply Work is a killer been doing it for the last 20 years actually
I feel yah a good week of crawling around on concrete diagnosing electronics on arcade games the joints often ache and back neck and shoulder pain seem to be rather common as well due to the odd positions you must been in for extended periods of time and constantly up and down off the floor. People think man what a great job hehe and it does keep you in somewhat of a decent shape but its also hard on the boday as well then when you need to work OT 50 60 hour weeks...
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Re: M550sv
Ahhh what a blunder I forgot something critical when doing voltage testing...
I will have to test when I can get some help maybe this weekend or something.
Sorry about this the measurements were incorrect due to no signal activating the shutdown long before the error happened I was sitting here thinking to myself hrmm I wonder why Cap Leaker dropped out of the discussion all together... So I am sitting here just pondering a variety of situations reread everything I typed thinking hrmm maybe I said something that was offensive in some way etc...Leave a comment:
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Re: M550sv
No thoughts on the random shutoff hrmmm yes it is hard to tell what is causing it because it is so random oh well hopefully I got enough info have to take the board back the last old RCA I finally figured out was a bad trace not visible by the naked eye or magnifying glass pretty crazy took forever to find it out budm stuck with me for a while then I finally came across a schematic which pointed me to an area where I replaced a smd zd lucky for me I had one on an old junk power supply from a TV. Then that was not it so finally after poking around while on I figured out...Leave a comment:
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Re: M550sv
Better pics of the back etc.......Leave a comment:
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Re: M550sv
PIN ON OFF
18V 18.1 18.2
18V 18.1 18.2
PWM 3.2 0
LDON 3.2 0
BLON 3.1 0
PWRON 3.0 0
12V 11.9 0
12V 11.9 0
12V 11.9 0
5V 5.2 0
5V 5.2 0
5V 5.2 0
I will note 12V is a somewhat slow drain to zero it sits at about 1v then goes to .7v then 0.
What is the PWM signal for what generates it the power button or the video board or something on the power board?
That would be the measurements. It does...Leave a comment:
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Re: M550sv
On working board I notice a few differences.
12V pins are NOT bridged like non working board
LD ON OFF & BL ON OFF ARE bridged on WORKING BOARD
There was 2 Caps with different values than non working board I have them marked on board.
Non working board is board with X
Measurements are up next but something to take a look at at current a very curious deal for me having access to another board is interesting never thought in a million years I'd get this lucky.
Time to run some...Leave a comment:
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Re: M550sv
Confirmed it is the power board I managed to get someone to let me use there power board for the night out of their same model TV!
Now there are a couple of oddities his was an after market and there is one capacitor 2200uf that has been replaced with a 1000uf cap and it looks like all of the smaller caps were replaced some of them beefed up voltage wise which don't hurt nothing but what has got me going is this cap they swapped out with less uf's I thought this was a no no in the cap world then again maybe the guy that repaired this TV the first time put...Leave a comment:
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Re: M550sv
You think? I know its common with certain gaming systems and certain laptop chip sets but the TV BGA socket has yet to cause me any problems I assumed the same with other main boards and had no luck trying to rework them the same issue cropped up every time the first one I did turned into a dud because I followed the temp curve chart for a PS3 which is incorrect.
After I looked at the specs it was more similar to a laptop for a reflow. Reballing is an art though hope you ain't busy for a while if you do it via hot air lol anyhow interesting you mention that though...Last edited by infringer; 10-02-2016, 08:58 PM.Leave a comment:
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M550sv
I have an M550SV by Vizio.
The unit powers on works but the picture and auidio if a video is playing both cut out but the Vizio light stays lit up. It is not reproduced by a specific thing leading me to believe it may not be the "firmware issue"
It will also go off if browsing in the menu long enough so it is not just playing video.
I was sold a kit to "repair" this problem U3 and U9 were both replaced 1117 voltage regulators I thought this was a full repair kit but I got stiffed out of 25bux for this kit.
They included fuses but I did...Last edited by infringer; 10-02-2016, 02:16 PM. -
Re: RCA L32WD22 No 15v No 24v no backlight
The Zener was fine.
The Resistor was fine.
The trace was bad. No voltage at those points but more importantly no continuity a very tricky deal being a single sided layered board I presume it would be easy to spot a bad trace but fooled as I was save the maybes and check the things that are certain in the line lesson learned.
Fixed by Jumpering a wire from R944 The side that shares the leg with the collector of the transistor -> to the + side of C915.
What a beast thank you for all of...Last edited by infringer; 05-24-2015, 06:48 PM.Leave a comment:
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