vizio v037l fhdtv20a no picture

[beer-b-q]

Re: vizio v037l fhdtv20a no picture

I did it anyway I do have picture. Where do I order these regulators?

[tom66]

Re: vizio v037l fhdtv20a no picture

I am surprised. Do the menus work?

[beer-b-q]

Re: vizio v037l fhdtv20a no picture

I plugged the cable in anyway and I have a picture. Where do I order the regulators and any tips on how to solder them in.

[beer-b-q]

Re: vizio v037l fhdtv20a no picture

Yes the menus work.

[tom66]

Re: vizio v037l fhdtv20a no picture

Quoting/Plagiarising Budm:

1117 series LDO from DIGIKEY:

Adjustable:
http://www.digikey.com/product-detai...SCT-ND/1967218

1.5V fixed:
http://www.digikey.com/product-detai...SCT-ND/2121241

1.8V fixed:
http://www.digikey.com/product-detai...SCT-ND/1967216

2.5V fixed:
http://www.digikey.com/product-detai...SCT-ND/2121243

3.3V fixed:
http://www.digikey.com/product-detai...OSCT-ND/660708

You can tell what the regulator type is by the adjust pin. If it is at ~0V, then it is a non-adjustable (fixed regulator.) Otherwise, it is an adjustable one.

Soldering the regulator -- excellent video by norcal715:
https://www.youtube.com/watch?v=cNFzBJELFoU&t=8m30s

Be very careful not to damage the pads... the best way is to be careful, not apply too much heat and to take your time.

[budm]

Re: vizio v037l fhdtv20a no picture

I added more to the list in case one is not available:
1117 series LDO from DIGIKEY:

SOT-223-3 style casing:

Adjustable:
http://www.digikey.com/product-detai...SCT-ND/1967218
http://www.digikey.com/product-detai...44-1-ND/586244

1.2V Fixed:
http://www.digikey.com/product-detai...40-1-ND/725525
http://www.digikey.com/product-detai...5-1-ND/1865519 1.2A

1.5V Fixed:
http://www.digikey.com/product-detai...SCT-ND/2121241 1A
http://www.digikey.com/product-detai...8-1-ND/1883983 950Ma
http://www.digikey.com/product-detai...26-1-ND/586226 1.2A

1.8V Fixed:
http://www.digikey.com/product-detai...SCT-ND/1967216

2.5V Fixed:
http://www.digikey.com/product-detai...SCT-ND/2121243 1A
http://www.digikey.com/product-detai...9-1-ND/1883984 950mA

3.3V Fixed:
http://www.digikey.com/product-detai...OSCT-ND/660708
http://www.digikey.com/product-detai...SCT-ND/3462387 1.1A

http://www.digikey.com/product-detai...28-1-ND/586228 1.2A

5V Fixed:
http://www.digikey.com/product-detai...SCT-ND/1967217
http://www.digikey.com/product-detai...7-1-ND/1865475

[beer-b-q]

Re: vizio v037l fhdtv20a no picture

Quoting/Plagiarising Budm:



You can tell what the regulator type is by the adjust pin. If it is at ~0V, then it is a non-adjustable (fixed regulator.) Otherwise, it is an adjustable one.

Soldering the regulator -- excellent video by norcal715:
https://www.youtube.com/watch?v=cNFzBJELFoU&t=8m30s

Be very careful not to damage the pads... the best way is to be careful, not apply too much heat and to take your time.

Im dont know what the adjust pin is.

[budm]

Re: vizio v037l fhdtv20a no picture

Please read this again:
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

[beer-b-q]

Re: vizio v037l fhdtv20a no picture

U44 and u16 do not have 1.25 vdc across pins 1 and 2.

[budm]

Re: vizio v037l fhdtv20a no picture

U44 is the 1117 ADJUSTABLE LDO, which is bad per earlier post of the voltage reading.
U16 is a 78XX series regulator, it is 7805 which is 5V regulator, it does not have the same pin out as 1117 series. This one is OK since the input voltage is wrong and it is really well protected regulator.
Per post 33, U19 and 21 are also bad.
Per my explantion on post 48, you can now verify which adjustable 1117 (without the -xx) is bad
The fixed output such as the one with -xx after the 1117-xx, I.E. 1117-18 will represent the fixed output 1117 LDO voltage output of 1.8V, -33 = 3.3V.

[beer-b-q]

Re: vizio v037l fhdtv20a no picture

I'll check these when I get home tonight thanks for the help.

[beer-b-q]

Re: vizio v037l fhdtv20a no picture

I rechecked the regulators and I think u19 is good.
u19
L112
G1117
1. 1.26
2. 2.51
3. 5.03
So if I read this right in post #50 U16 is good?

[tom66]

Re: vizio v037l fhdtv20a no picture

It looks like U19 is good.

Since the TV is now working, it is possible the regulator is temperature sensitive -- i.e. as it has now warmed up (or cooled down), the regulator has begun working again.

Unfortunately it's now a matter of waiting for it to fail, if it does... and if it does fail, then taking the measurements of suspect regulators, and replacing the one(s) which do not work properly.

[beer-b-q]

Re: vizio v037l fhdtv20a no picture

The tv only works if I jump the 5dcv to pson on the psu.

[tom66]

Re: vizio v037l fhdtv20a no picture

So if you then turn it off using remote or button, and try to turn it on again, what does it do? It might be unrelated to the regulators -- some kind of EEPROM problem a lot of Vizios have...

[budm]

Re: vizio v037l fhdtv20a no picture

u19
l112
g1117
1. 1.12
2. 2.515 (The output should be = 1.25 +1.12 = 2.37V)
3. 5.02

Is your meter steady? That was the reading in your earlier post11.

[beer-b-q]

Re: vizio v037l fhdtv20a no picture

I checked it 3 times I made a mistake in post 11.

[beer-b-q]

Re: vizio v037l fhdtv20a no picture

So if you then turn it off using remote or button, and try to turn it on again, what does it do? It might be unrelated to the regulators -- some kind of EEPROM problem a lot of Vizios have...

Only the vizio emblem will come on without the jumper.

[beer-b-q]

Re: vizio v037l fhdtv20a no picture

budm in your earlier post #50 did you mean U16 was good?

[budm]

Re: vizio v037l fhdtv20a no picture

U16 is 7805 which is very reliable regulator, right now it does not have input voltage (reading in mV range per your psoting) feeding it due to other regulators are not working. So it should be OK.