Vizio E470VL Orange Light/No Power

[splitcrete]

Re: Vizio E470VL Orange Light/No Power

Check out this you tube video. http://www.youtube.com/watch?v=jR2UZhoDC2c

[splitcrete]

Re: Vizio E470VL Orange Light/No Power

Its cap c241 under the heat sink. I have changed all the regulators on the inverters all the regulators on the main board .the two caps on each inverter . the inverter IC both master and slave. No change.. I took all the caps off the power board, and checked them with a meter. The five 1000 uf 35-v were all 20% low or lower. So I ordered new caps for the entire board . I will see what happens when they come in. OH my problem is no backlight vizio orange to white. No power to turn back lights on.

[saintlouis74]

Re: Vizio E470VL Orange Light/No Power

Its cap c241 under the heat sink. I have changed all the regulators on the inverters all the regulators on the main board .the two caps on each inverter . the inverter IC both master and slave. No change.. I took all the caps off the power board, and checked them with a meter. The five 1000 uf 35-v were all 20% low or lower. So I ordered new caps for the entire board . I will see what happens when they come in. OH my problem is no backlight vizio orange to white. No power to turn back lights on.

ok please let me know

[Berti]

Re: Vizio E470VL Orange Light/No Power

ok please let me know

Watching this thread too.

My VO47LFHDTV10A (manufacture date 2008) blew a cap @ C241 - 740uf 35v two days ago and spewed its acid on the heat sink sending up a puff of white smoke like I haven't seen since my college days. I replaced it and the TV worked for about 24 hrs then the problem came back. C241 is bulging, and C952 1000uf 10v doesn't look so great either so I will replace all the caps this time, hopefully, tomorrow. (Wish me luck, I'm a total rookie.)

[budm]

Re: Vizio E470VL Orange Light/No Power

Make sure to use the cap with LOW ESR type, not general purpose type. VO47LFHDTV is not the same as the OP's E470VL.

[selldoor]

Re: Vizio E470VL Orange Light/No Power

(Wish me luck, I'm a total rookie.)

Just to check - you do know caps have polarity - you have to get them the right way round

[tmwalsh]

Re: Vizio E470VL Orange Light/No Power

Splitcrete, I am chasing the same problem. No change from orange to white, no video, no back light, and literally no response to the power button or remote. Did you ever resolve the problem?

The power supply is up and running, and the chip under the RF shield on the mainboard is pretty warm after sitting overnight laying face down in standby. 105F by contact with the RF shield using a digital meter.
I checked all regulators, and the numbers seemed proper. The 7805 is not doing anything because it is in standby.


The set was working fine until I tried to hook up my wifes ROKU box. It got to where it was going to download new software, and was supposed to re-boot after. It didn't. I waited 1/2 hour, and then called ROKU support. They went through the power down, disconnect, power up etc routine to no avail. They then said try HDMI-2 instead of HDMI-1. I also tried composite (yellow RCA) input and all got the "No Signal" floater on the screen.
I plugged the composite into a nearby CRT television and the raster seemed to wobble and wiggle all over the place rather than be a dark blank screen indicating no input, it was lit as if there was 'something' there. Horiz & vertical were jittery and the raster was not 'black', but gray.
ROKU said the ROKU was bad, and ship it in for replacement. I did notice this box was a lot hotter than the duplicate box elsewhere in the house.

Next AM, the E420VL did not respond. Orange logo lit. No backlight. No white logo. It had been fine before the ROKU rodeo.


Question 1: Can the ROKU output stuff onto the HDMI such that it would fry the mainboard / processor? In Other Words, did the ROKU destroy the mainboard, or at least make it inoperative?
Question 2: I understand the power supply can be jumpered manually to eliminate it from consideration as failed. What voltage is needed and is it a 'monentary contact' or continuous? I've read of using a resistor to drop the standby 5v to 3.3v or similar.

note: I have replaced the EEPROM already with no difference. I did dislodge a decoupling capacitor from the board which was in parallel to another used for the 16 pin layout on the HOLD and VCC (7&8 on the 8-pin jumpered together) lines, so I did not think that terribly significant... though I have been wrong before.
This is bothersome. TV worked fine, no surges, no lightning, nothing to upset it. Not even moved, and not working.
Buehler?

added:
TU5
M091
G1084
pin 1 0
pin 2 0
pin 3 3.28

[selldoor]

Re: Vizio E470VL Orange Light/No Power

It wont be of help to you but did you treat the hdmi sockets as plug and play
and plugged in the roku when either was stitched on?
I have been warning people that hdmi is not plug and play due to the number of cases on here where it stuffs the main/logic board.

[tmwalsh]

Re: Vizio E470VL Orange Light/No Power

Oh, frack. The ROKU tech gave no warning 'bout that, and the set & ROKU were both new to me. He walked me through several power-down, swap, power-up conditions, but not the specifics beyond " now lets try HDMI-2"...
Whatever he said to do, I followed, power-wise. I even asked specifically what was to be powered and in what order. Rats.

I always say, you either learn to do it yourself, or you pay for not learning. This was a 'spensive lesson. Cannot wait to tell the Mrs. I told her setting up a ROKU was simpler than connecting a DVR and she actually was pushing the buttons and connecting the things (all powered down the 1st time through) and now this.
If their box had not been defective, I doubt I would have done any of this. More rats.
tom

[selldoor]

Re: Vizio E470VL Orange Light/No Power

My understanding of jump starting the power supply is:
Depending on whether the normal signal is high to low or low to high you can
sometimes disconnect the main board then using a 500-1k ohm resistor jumper
in the first case the PSON to Ground or in the second case PSON to 5v standby. To see if the backlight comes on you may also need to jumper
BLON to 5v again using a resistor.

You can see lots or posts regarding this if you use the search above and
search for "PSON to ground" it brings up pson to 5v as well.