Vizio E470i no power

[AcGeorgiegirl]

Re: Vizio E470i no power

I also tested the CN302 jack pins while the 2 jumpers were still intact on the CN301, using a 200 on the v dial. Here's the results:

Pin 1 LED1 - 60 to 70v
Pin 2 N.C
Pin 3 VOUT1 - 121 to 130v
Pin 4 N.C
Pin 5 LED2 - 61 ti 72v
Pin 6 N.C
Pin 7 VOUT2 - 120 to 128v

[AcGeorgiegirl]

Re: Vizio E470i no power

I just tried it just using a wire(not resistor) and below are the pin readings. But...the backlight still doesn't come on. ( I realize that I just need to check v for the ps-on, but it can't do anything without the Main). I did leave the ps connected to what I am thinking must be the backlight or panel...the cn301. I'm going to take a pic for you guys and post it of this jack.

pin 1 stndby - 5.21v
pin 2 stndby - 5.21v
pin 3 Gnd
pin 4 Gnd
pin 5 Gnd
pin 6 12v - 11.89v
pin 7 12v - 11.89v
Pin 8 PS on/off - 5.21v
Pin 9 Blu on/off - 5.21v
Pin 10 PWM1 - 5.21v
Pin 11 PWM2 - 5.21v
Pin 12 NC

[newtothis]

Re: Vizio E470i no power

I think he is getting confused with another board maybe.

The PSU send 5v standby to main, The main needs the 5v to operate the circuit that detects you switching it on... When you switch it on the main sends power to the PS_ON pin... The PSU detects the ON signal and switches the rest on.

I have no idea why the SOT blew on the PSU, Unless you shorted the incorrect pins but using a resistor would stop damage usually occurring.

If you get the voltages come up on the other PSU by jumpering the PS_ON then list each pin name and what voltage you have.

Pin 1 - 12v
Pin 2 - 5v

etc

etc

[AcGeorgiegirl]

Re: Vizio E470i no power

I first tried it just using a wire(not resistor), and I did get a 5.2 v onto each of the pins(bl-on and ps-on). So what does that mean??? How can it actually switch on the backlight and the power, without being connected to the Main?(yes, I'm still stuck in not understanding this, I guess). How could I get the backlight and power on by jumpering, unless the main is connected?

[AcGeorgiegirl]

Re: Vizio E470i no power

I am about to go try the same procedure (jumping using a 1k ohm resistor from 5v stndby to the ps-on and bl-on pins) on the original board. I damaged the replacement one, fyi.

[AcGeorgiegirl]

Re: Vizio E470i no power

On the pic you linked a closeup of the cn201, which is the jack we've been talking about thus far. Is that what you mean? There are only 12 pins. I can't see a P201 or P701...anything with that larger amount of pins.

[budm]

Re: Vizio E470i no power

I think he meant P201:
https://www.badcaps.net/forum/attach...3&d=1432326777

[AcGeorgiegirl]

Re: Vizio E470i no power

OK. If you can't find a 500ohm resistor (I could only find 470ohm) then look for a 1Kohm resistor. That will be one with 1st band-BROWN (1), 2nd band-BLACK (0), 3rd band-RED (00). GOLD or SILVER for the 4th band but is not important right now.
On the Power Board jack P701 with the TV plugged in the AC measure Pins10-15 and 20-21 and see if you're getting 5Vdc.

I don't want to keep bugging folks, so I won't post again, but am still wondering what jack you are suggesting I test? I find no other comm port other than the one I previously tested, that goes to the Main, and one that looks like to belongs to the panel(it has video-related pins, but only 4). Also, were you advising using a 1k ohm resistor only on this P701 jack, or for both it and the connector I blew a cap on(the Main connector)?

[newtothis]

Re: Vizio E470i no power

I haven't found anything but maybe someone else will have an idea.

That is a SOT not a Cap

[AcGeorgiegirl]

Re: Vizio E470i no power

OK. If you can't find a 500ohm resistor (I could only find 470ohm) then look for a 1Kohm resistor. That will be one with 1st band-BROWN (1), 2nd band-BLACK (0), 3rd band-RED (00). GOLD or SILVER for the 4th band but is not important right now.
On the Power Board jack P701 with the TV plugged in the AC measure Pins10-15 and 20-21 and see if you're getting 5Vdc.

I am wondering if you actually have the schematics for my psb? I can't locate the P701 jack you are referring to, and would be great to have the schematics!!

[AcGeorgiegirl]

Re: Vizio E470i no power

Any luck getting the schematics? I've looked everywhere I can think of. I failed to mention that when I blew the cap, the resistor I found to use was a 1k ohm, as pictured. I couldn't get a macro shot close enough to see the color bands for you guys, sorry.

[AcGeorgiegirl]

Re: Vizio E470i no power

Ok pics are very unfocused TBH.

That's a SOT23 package transistor that's blown by the looks of it.

Can you give us the part number off the PSU please as may need to find a schematic

PN: 00500-0614-0270
*fyi, I'm confused about the pic's...they are huge, but clearly focused when I click their links

[newtothis]

Re: Vizio E470i no power

Ok pics are very unfocused TBH.

That's a SOT23 package transistor that's blown by the looks of it.

Can you give us the part number off the PSU please as may need to find a schematic

[AcGeorgiegirl]

Re: Vizio E470i no power

OK. If you can't find a 500ohm resistor (I could only find 470ohm) then look for a 1Kohm resistor. That will be one with 1st band-BROWN (1), 2nd band-BLACK (0), 3rd band-RED (00). GOLD or SILVER for the 4th band but is not important right now.
On the Power Board jack P701 with the TV plugged in the AC measure Pins10-15 and 20-21 and see if you're getting 5Vdc.

I didn't get to test the p701 pins, yet, due to my mishap with the cs201 pins, but I'm also not finding this jack on the board at all. Only other connector is the CN301 with pins for vout and led.

[AcGeorgiegirl]

Re: Vizio E470i no power

Ok What happens is the 5v STBY is routed to the mainboard... When the mainboard is switched on it send voltage to the PS-ON pin of the PSU allowing the other voltages to rise.

So first thing is we should be telling you to use a resistor to jumper the pins not just a wire. So get a ~500ohm resistor and connect it from 5v STBY to PS-ON and measure voltages with Red to pin and Black to the chassis (Ground)

List the Pin name and readings like this :

Pin 1 - 5V STBY - 5v
Pin 2 - PS_ON - 5v
Pin 3 - 12v - 12v

etc etc

Make sure you are using VDC on your meter and not VAC, If your meter is old make sure your battery is good too.

I got this started, but made a goof somehow, because a cap blew the second I touched the red probe to the 5vdc pin! I also found a blackened area nearby the cap, so I'm assuming I did some damage somewhere along the cap's trace? The cap is a 47uf 50v. That's the first time I've had this mishap, and it gave me a "come to Jesus" moment, as we say here in the South. Just to clarify, I was supposed to test dcv while the ps-on pin was jumpered over to the 5vdc, correct? I'm wondering if how I connected ac would have mattered? I used the tv's cord, which is only a 2-prong, but connected it using my 3-prong extension cord.

[Andrew F. Ali]

Re: Vizio E470i no power

OK. If you can't find a 500ohm resistor (I could only find 470ohm) then look for a 1Kohm resistor. That will be one with 1st band-BROWN (1), 2nd band-BLACK (0), 3rd band-RED (00). GOLD or SILVER for the 4th band but is not important right now.
On the Power Board jack P701 with the TV plugged in the AC measure Pins10-15 and 20-21 and see if you're getting 5Vdc.

[budm]

Re: Vizio E470i no power

Resistor codes:

[AcGeorgiegirl]

Re: Vizio E470i no power

Got it, thanks! I've been searching for a resistor with no success, among my graveyard of tv's to fix in my den! I know what they look like, but don't know how to determine ohm values except by their colored bands. I've been looking for either a 4 or 5-banded R. 4's with colors green, brown, brown, gold. 5's with green, brown, brown, black, red. Is this correct?

[newtothis]

Re: Vizio E470i no power

Ok What happens is the 5v STBY is routed to the mainboard... When the mainboard is switched on it send voltage to the PS-ON pin of the PSU allowing the other voltages to rise.

So first thing is we should be telling you to use a resistor to jumper the pins not just a wire. So get a ~500ohm resistor and connect it from 5v STBY to PS-ON and measure voltages with Red to pin and Black to the chassis (Ground)

List the Pin name and readings like this :

Pin 1 - 5V STBY - 5v
Pin 2 - PS_ON - 5v
Pin 3 - 12v - 12v

etc etc

Make sure you are using VDC on your meter and not VAC, If your meter is old make sure your battery is good too.

[Andrew F. Ali]

Re: Vizio E470i no power

ok, so "hooked up" = main board connected...or plugged into power supply?
Please give me details of how to measure pins to GND. Would I use black probe to a GND pin and red one to each of the previous pins I've mentioned(ps-on, pwm's, 12v's, and BLU? "use pin out"?

Use this as an example:
Pin 1 ps-on 3.15Vdc
Pin 2 BLU 3.65Vdc
Pin 3 12V 0Vdc
Pin 4 Stby 5Vdc
etc
etc

Note: Your DMM should be set on the 20V DC Scale. The BLACK probe must be attached to the bare metal frame and the RED probe carefully placed on the pins.
Hope this helps.