I hope I'm doing this the correct way. I'm new the the forum and have a stupid question. I'm working on a Vizio vx42l, the u33 regulator is bad. Is there a regulator I can buy for this application that comes ready to install, and if so where can I get it. I've been looking at different products online and am more confused after looking. The part is a 3 pin regulator 1117 input voltage is 5 output is 3.3. I don't know wattage or if that even matters. Please help.
-
-
--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
--- end sig file --- -
Re: Voltage regulator
The 1117 is the "family name" of a type of regulator that's very standardized and it's made by several companies.
I've actually watched a video on Youtube where the guy was replacing that exact regulator, U33 :
http://www.youtube.com/watch?v=cNFzB...ture=g-all-lik
His TV has the same issue.
digikey.com is a good online store to buy from, you just have to go to low drop regulators and select something with 1117 in them and adjustable (not factory fixed to certain values) :
He used this one: http://www.digikey.com/product-searc...=497-1229-1-ND
You want the one in the middle, as the first is a minimum quantity and the other is for supplying you the parts on a special reel which costs money.
These would also work just fine:
http://www.digikey.com/product-detai...ICT-ND/1301524
https://cdn.badcaps-static.com/pdfs/...851427662f.pdf
and if you'll search for 1117 on digikey you'll find tens of chips that are also compatible.
Just get one that can do current output 1A or more. All the above do.Comment
-
Re: Voltage regulator
Thank you all for the help.Comment
-
Re: Voltage regulator
If anyone is wondering why I don't/didn't provide exact links to parts in my how to test a voltage regulator post, here are some reasons which I have seen happen on this forum
- that part could be out of stock at some future
- the supplier may not carry it in the future
- the supplier may go out of business
- people from around the world may face high shipping costs, taxes, etc and prefer alternatives
- people may have accounts with favourite distributors or go to local store
- there may be a cheaper, but just as good alternative--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
--- end sig file ---Comment
-
Re: Voltage regulator
See post 27, 29 the the list of 1117 series regulators: Adjustable and Fixed output.
https://www.badcaps.net/forum/showth...t=23123&page=2Never 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
-
Re: Voltage regulator
This is the way to figure out if the adjustable regulator is good or not:
Notes: we are looking at the regulator with the Big tab up (the big tab is tied internally to the center pin).
Adjustable regulator will have two resistors attached to it, one resistor (Rfb) is between pin1 and pin2, another resistor (Rg) is between pin1 and ground. Pin3 is an input pin.
The voltage between the Adjust pin (left pin) and the center pin (Pin2, output) will always be 1.25V +/- 2% (this is the precision voltage reference), if it is not, it is bad.
To figure out what the output voltage should be: measure the voltage between pin 1 and ground and add 1.25V to that number, that is the output voltage on pin 2 but you have to make sure you do have 1.25 between pin 1 and 2 as noted above.
See my Voltage calculator spreadsheet here, post #6:
https://www.badcaps.net/forum/showth...417#post273417Last edited by budm; 10-14-2012, 08:22 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
-
3+1 Voltage Regulator for IMVP-7/VR12 CPUs
Compliant with IMVP-7/VR12, the ISL95831 provides a complete solution for microprocessor and graphic processor
core power supply. It provides two Voltage Regulators (VRs) with three integrated gate drivers. The first VR can be
configured as 3-, 2- or 1-phase VR while the second output is 1- phase VR, providing maximum flexibility. The two VRs share the
serial control bus to communicate with the CPU and achieve lower cost and smaller board area compared with the two chip approach.
Based on Intersil's Robust Ripple Regulator...11-05-2024, 03:24 PM -
hello ,for diy voltage injector for short killer/finder -- is it possible to use something like this - LM317 DC Linear Regulator, DC-DC 4.5~40V Turn 1.2~37V, Step Down Power Module, Adjustable
and ampere controller along (to make it zero amps ) with some addons(transistors diodes etc.) for it -- and use some 5v adaptor or 3.3v volt rail of my smps power supply as input and finally get 1v and zero amps for injecting voltage to find out short circuit component ? ..
for source input -- can we use 3.3 -4 volt 18550 battery ?( i have some of those ) and then adding ampere regulator... -
This Concept 2 rower pm5 monitor doesn't shut down. It keeps turning on and stays on after being turned off. I read on another forum by another user that replaced the same component to check the voltage regulator.
The monitor should pull around 35mA when turned on and in shutdown it should drops to around 0.060mA. Any advice on finding the voltage regulator on this board to check if it needs to be replaced?
11-05-2024, 07:38 AM -
Hello all. Excellent forum you have here - it has already been a great help to me. I am posting the details of my situation before I go and start buying parts to see what suggestions the great minds here may have on diagnostics or otherwise.
I have an Acer AL1916W monitor which has recently failed in the following way: the screen comes on at power on, but after a couple seconds the screen goes black. Using a flashlight, I can easily verify the LCD is fine but there is simply no backlight.
The power supply board is of the type ILPI-025 Rev C (Date of manufacture was... -
The ram regulator produces VTT voltage of 0.65V and the display comes. When we restart the laptop the VTT voltage becomes 0.75 and no display.[Used same ddr3l ram].
Also, it becomes 1.35 V on the ram coil and all are okay but after restarting Voltage becomes 1.5V with no display.
Comment