vizio va370m regulators

[doughboy0032]

hello. i know im asking about another dreaded vizio, not to mention the va370m. My Tv just gave my the Vizio Logo screen of "confusion" It just sits on the vizio screen and nothing i do will make it go past it. anyway i got it figured out where its the main and was testing regulators and had one dead, however I cant find it online. Any Ideas of where to get it? I include a pic of it. its the G903T63B (903t63) Help please.



BTW BAD CAPS IS AWESOME!

MIKE

[selldoor]

Re: vizio va370m regulators

Perhaps one of these would work

http://www.digikey.com/product-detai...3GG-ND/2546107

Check/compare datasheets. Care re physical size so it fits the pads

[doughboy0032]

Re: vizio va370m regulators

I talked to digikey when I ordered the other ones. They say its not available and they claim there is no cross reference. I would think there something comparable and compatible.

[budm]

Re: vizio va370m regulators

May I ask what voltage readings you get on all 3 pins? It looks like 1117 series LDO

[doughboy0032]

Re: vizio va370m regulators

Ill have to check when I get home. I'm at work til 9p. If I remember correctly it went 5-3.2-0

[budm]

Re: vizio va370m regulators

One of the pin is at Ground, so 0V reading, the 5 must be the input which is 5V, the middle pin/big tab is the out put pin, 3.2V? The out put should be within 2% (3.23V = 2%). So it looks like it is OK.

[doughboy0032]

Re: vizio va370m regulators

Now don't quote me on that lol. Ill have to make sure but I think either far right or left was the 0.
I didn't see any bad caps or anything.... without pulling and testing them all.

[budm]

Re: vizio va370m regulators

From your picture, the pin on the right is the ground pin, left pin is the Input.

[doughboy0032]

Re: vizio va370m regulators

OK ill have to plug the board back in and test them all again when I get home

[doughboy0032]

Re: vizio va370m regulators

OK reg 903t63 is 5-3.2- 0. Reg 17809 is 5-3-0a reg g9084-50(big one on bottom of board)
is 9-4-0

[budm]

Re: vizio va370m regulators

"Reg 17809 is 5-3-0a reg g9084-50" I am not familiar with these numbers of the regulator.By the way, the problem you are having right now is that you so have backligts with VIZIO logo on the screen, that is? It will not do anything else, but you can still turn it off? It sound like corruption of EEPROM?

[doughboy0032]

Re: vizio va370m regulators

Correct. The screen comes up black with vision screen and that's it. Can turn it off and on. It just started. It would take longer and longer to start up and some days it would start immediately. Then 2work weeks ago just the vision screen. I think I just found some bad caps on the power board...not popped but a little mustard color film. So u saying dead main?

[budm]

Re: vizio va370m regulators

Not sure.

[doughboy0032]

Re: vizio va370m regulators

Lol I love this little TV. The sound is good and has a good pic....better than my moms 40" LG. And my friends over priced wall frame.id be willing to spend 10-15my in cap to save 100 for a new board or new TV yet. Any other tests you recommended?

[selldoor]

Re: vizio va370m regulators

"Reg 17809 is 5-3-0a reg g9084-50" I am not familiar with these numbers of the regulator.

Budm - Think those are the voltages on the 3 different regulators. He was testing when he got back home.
Reg 903t63 is
5V
3.2v
0.v

Reg 17809 is
5v
3v
0v

reg g9084-50(big one on bottom of board)
is
9v
4v
0v


DB have you tried getting into the service menu to do a reset - sometimes you can get menus when the rest is scrambled

https://www.badcaps.net/forum/showpo...33&postcount=6

I think I researched 903t63 and it is a fixed 3.3 600ma so if it was the correct physical size the one I suggested would do as a replacement but looks like you dont need one.

[doughboy0032]

Re: vizio va370m regulators

I cant even get a menu to pop up (if im doing it right anyway) Its just vizio screen. Off topic the tcon board is giving some weird readings on the regulators also. I still have to check that other regulator to see if it would fit, Do you want me to just measure with a tape measure?

[doughboy0032]

Re: vizio va370m regulators

Replaced all the capacitor on power board and still no progress

[doughboy0032]

Re: vizio va370m regulators

ok found the measurements of the 903t63b. Not sure where to go now. any sugestions?

[electronicsurplus]

Re: vizio va370m regulators

Why don't you use LM1117 3.3V
Which are simply 3.3 Low Voltage drop out Voltage Regulators
They are available all over EvilBay for about $1 or so each

I use them all the time and work fine for me

Sometimes you can actually reflow the original and this works also using a heat gun on the regulator