Re: low voltage regulator
Thank You for the information, but don't you need to know which is the anode and cathode??
That is why you need the spec sheet right?
Salvamex
Member
Last Activity: 04-14-2014, 07:49 AM
Joined: 11-14-2012
Location: Siloam Springs
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Re: low voltage regulator
Well I tested the SDB51 and they are good.
When you look at the markings on a low voltage regulator or a schottky rectifier (they both look the same to me) which is the number that I go by, the bottom number, the top or both?
I have tried all of them and I can not find any data sheets on the d482.
is there a video that teaches this?
I know I might sound dumb, but I am new and want to learn so please be patient and thanks for the help.Leave a comment:
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Re: low voltage regulator
Thanks for information.
I will test to see if they are any good.Leave a comment:
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Re: low voltage regulator
Take a look at these pictures and tell me if these are low voltage regulators.
I looked up the markings on them and they come up us HIGH VOLTAGE SCHOTTKY RECTIFIER.
is that the same as a low voltage regulator or not?
If not can some one tell me how to test if they are good.
The readings are in the 133 volts but i do not know if I am testing them properly.
Please help.
Thanks...Last edited by Salvamex; 04-07-2014, 12:23 PM.Leave a comment:
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Re: low voltage regulator
is there any link on this forum to go to about learning how to read the markings/stampings of the low voltage regulators.
By the markings or stampings I mean the letters and numbers on top of the ldo.Leave a comment:
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Re: low voltage regulator
Thanks for the help.
Where did you get that information?
I will need to test others and I would hate to be bothering you every time.
Thanks again.Leave a comment:
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low voltage regulator
I have a Vizio M3D550KDE that has jumping pictures and lines.
I read the section on how to test the low voltage regulators.
I tested the ones with the dash prefixes (it says that the - prefixes means that it's a fixed regulator) but I can not find the data sheet for the following one that is not fixed and not sure which is the part number:
0273
912t43
That is exactly how it looks on top of it.
is it 0273 or 912t43 or all together?
I looked for it at the following link already but I can not find it.
[url]http://pdf1.alldatasheet.com/datashe...C/1117-33.html[/url]... -
Re: Vizio m550nv
Thanks for all the support I get on this forum.
You guys are great.
I decided to buy the power supply board, installed it and the tv works great.
I am sure I will be posting again soon to get more help on another tv.
Thank you again.Leave a comment:
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Re: Vizio m550nv
WOW Thank You, But no way I am capable of doing that.
At this point, I am willing to buy the board, I will look for it.Leave a comment:
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Re: Vizio m550nv
What more in-depth troubleshooting will be required?Leave a comment:
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Re: Vizio m550nv
okay here we go:
14 (PWM) = .84v
13 (N.C.) not connected
12 (BL_ON: Backlights ON, >3VDC = ON) = 3.3v
11 (PWR_0N: power on >3VDC =3.2v
ON, the voltage on that 450Vdc cap will go from 170VDC to around 390Vdc due to PFC Voltage booster kicks on which you have already verified) = 397v both caps
10~8 (12VDC power supply) = 1.81v
7~4 (Ground) = 0VDC
3~1 (5V standby) = 5.13v
__________________Leave a comment:
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Re: Vizio m550nv
Voltage readings of which component?
the one in the bottom it's all black with no marks on it (yellow circle), if it's a fuse it checks out fine. I tested both fuses (green circles)and they are okay .000 on continuity test and my multimeter beeps same as the one in yellow circle. I tested all 6 diodes I can identify (red cricles) and they all check out okay but I have not tested the bridge and the opto-isolators because I don't know how.
I checked all diodes and on the cathode side I get a reading of .480 and when I switch the probes on the on the...Leave a comment:
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Re: Vizio m550nv
Thanks, and I am glad it worked for you, but this is a different model so the boards are different.
I did check fuses f1, f3 and f8 for continuity on the main board and they all work fine.
I am stuck I dont know what to doLeave a comment:
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Re: Vizio m550nv
Thank you, but what if it's not the main board but the power supply.
I dont want to pay $105.00 for nothing.
I would like to get help here so hopefully I can fix it or buy the right board and not be guessing.Leave a comment:
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Re: Vizio m550nv
I am using attached screw to metal frame inside tv for ground.
And yeah I am using the 20v mark on my meter.
What about the readings on the 450 caps?Leave a comment:
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Re: Vizio m550nv
Please help, I know I have bad pictures but it's always dark when I get home from work and it's hard to get good pictures.Leave a comment:
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Re: Vizio m550nv
Okay here are the readings:
the bottom one on standby 168v while it's on 396v
the top one on standby 168v while it's on 396v
What do you think?Leave a comment:
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Re: Vizio m550nv
Yes the meter is set to dc and the correct range.
I replaced the battery last week with a brand new one.
Is it safe to test them? the 450v caps?
And I imagine the setting on the meter needs to be on 600v right?
Also, does it matter which probe goes to what leg?
Sorry but I am new to all of this....Leave a comment:
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Re: Vizio m550nv
Here is the close up...Leave a comment:
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Vizio m550nv
Please help.
I have a 55" vizio that when I connect it to the wall outlet, the vizio orange light flashes a lot of times and after a while it stays orange, I turn it on and the orange light turns to white but with no picture or sound. the whole screen is black.
I opened the tv and got the following readings once the tv was on (white vizio light) on the power supply board where I have placed the red circle on the picture.
from the bottom up
1.86v supposed to be 12v
1.86v supposed to be 12v
3.22v supposed to be 12v
3.32v supposed to be...
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