Vizio E37OVA hdmi ports no signals

[AcGeorgiegirl]

Hey y'all. This Vizio was working fine, then each hdmi port stopped getting signals. Otherwise, everything works great. I've searched for general hdmi port troubleshooting, and only find things related to power-cycling, resetting to factory, etc, but this isn't fixing it. I've tested 3 different hdmi cables and 3 different devices....all of which do work fine on another tv of mine. I came to info that calls for me to understand/know how to trace to components for testing them, but I don't have enough details for my skill level, and thought I'd ask you guys for help. I see no physical damage to chips surrounding the ports. I don't know how to test for voltage going to the ports, and assume this may be a start?

[mmartell]

Re: Vizio E37OVA hdmi ports no signals

You can test the regulators on the main board for proper voltage. Put your finger on the chip in the center of the third image, that's the chip responsible for the hdmi ports. It may need to be replaced.

[charis]

Re: Vizio E37OVA hdmi ports no signals

From what i see in the photo they using one HDMI chip.All the big brands like lg or samsung have separate hdmi ic for each port.When the 5v due to short in cable or to input device blow an hdmi the others keep work.
In your set this dont happen.
Check FB 503-504-502-506 and the 2 resistors near.Also near CN506 you have a resistor with a zero on it.
On pin 18 in HDMI port(first down left as we look from the front) you must have 5v all times.

[AcGeorgiegirl]

Re: Vizio E37OVA hdmi ports no signals

Thanks, guys!
I know what the resistors are/how to test them, but don't know what "FB"s are...not that I didn't find them, but just don't know what the acronym stands for, and so I can't research how to test them(or, did you mention them only to indicate which resistors to test, nearby each?).

[budm]

Re: Vizio E37OVA hdmi ports no signals

FB = Ferrite bead which is basically a very small inductor, it should show as very LOW OHM (<1 Ohm).

https://cdn.badcaps-static.com/pdfs/...99c6d4dd39.pdf

http://www.murata.com/en-us/products...en-20110614-p1

http://www.radio-electronics.com/inf...-inductors.php

[AcGeorgiegirl]

Re: Vizio E37OVA hdmi ports no signals

Thanks, BUDM
Weird, I couldn't find this info. I gave up too soon!

[AcGeorgiegirl]

Re: Vizio E37OVA hdmi ports no signals

How do I test the resistors on my board? They are so small, no codes are seen, and I can't calculate what the resistance should be. I understand that a totally blown one will have infinite resistance reading, etc.

[AcGeorgiegirl]

Re: Vizio E37OVA hdmi ports no signals

Pin # 18 on the 1st hdmi port(far left) had no voltage, both in standby and powered on.

The FB's:
504 .4
501 .4
502 .7
503 .3

The Resistors:
at FB504 30.8 & 31.6
at FB501 47 & 47.6
at FB502 46.6 & 47.7
at FB503 47.1 & 47.8

[mmartell]

Re: Vizio E37OVA hdmi ports no signals

Is the chip heating up ? Might have to be replaced.

[AcGeorgiegirl]

Re: Vizio E37OVA hdmi ports no signals

Do you mean does it get warm when the power is on? It's warm to the touch. Would the pin#18 not having voltage mean the chip is bad?

[mmartell]

Re: Vizio E37OVA hdmi ports no signals

Trace pin 18 to see if it goes back to the ic. If it does then check the datasheet for the ic to see what voltages it should have and measure to see if they are present.

If the ic is responsible for powering the ports and it is receiving voltage then it has likely failed.

[dick_barton]

Re: Vizio E37OVA hdmi ports no signals

Data sheet:


I think Pins 9, 27, 38, 64 should all be at 3.3V which are probably the 4 supplies for each of the 4 internal HDMI controller ports.

[AcGeorgiegirl]

Re: Vizio E37OVA hdmi ports no signals

I'm getting around to testing them today. Just wondering...the data sheet diagram lists pins 50-51 as "HDMI control signals". What are these?

[dick_barton]

Re: Vizio E37OVA hdmi ports no signals

There are 4 HDMI inputs so it could be to switch between HDMI1,2,3 and 4 using two data lines but this is purely guesswork.

[AcGeorgiegirl]

Re: Vizio E37OVA hdmi ports no signals

These pins 9, 27, and 64 measure 0.13 each. Pin 38 measures 0.5...I'm assuming the chip is damaged/gotta replace?

[AcGeorgiegirl]

Re: Vizio E37OVA hdmi ports no signals

In the datasheet you've linked, the diagram of the ic gives ids of each pin number but no voltage info. Did I miss something?

[AcGeorgiegirl]

Re: Vizio E37OVA hdmi ports no signals

Guys, If the ic isn't sending correct voltage only to the hdmi ports(everything else works just fine on the tv), is there any other component that I should be checking for damage/failure? IE...what could cause only the hdmi voltage to go haywire?