Vizio VO420E Main Board

[VaBeachTennis]

I ordered the Eeprom repair kit and I am wondering if anyone knows the Eeprom locations and can tell me which one to replace. The symptoms are:
amber standby light
white logo light after I turn on power
No picture, no sound and can turn the power off.

I already replaced the power board and nothing changed.

Here is the information for the board:

Vizio:
3642-0732-0150 (OB)

Sadly, my board seems to be kind of rare to obtain for a working replacement, so I ordered the kit to replace the EEPROM. Does anyone here know which EEPROM I am supposed to replace? I also need the location, here is the board below:

[Andrew F. Ali]

Re: Vizio VO420E Main Board

If you bought the kit....Look at the Nos. on the kit IC/s and replace that on your Main Bd. with the same No. Probably change out everything that came with the kit.....

[diif]

Re: Vizio VO420E Main Board

Bottom left in your photo, got a spot of paint on it.

[VaBeachTennis]

Re: Vizio VO420E Main Board

If you bought the kit....Look at the Nos. on the kit IC/s and replace that on your Main Bd. with the same No. Probably change out everything that came with the kit.....

Thank you.

[VaBeachTennis]

Re: Vizio VO420E Main Board

Bottom left in your photo, got a spot of paint on it.

Thank you! After you said that, it made a lot of sense. It seems that they are both by the HDMI inputs?

[diif]

Re: Vizio VO420E Main Board

Looking at a better photo on shopjimmy. It looks like there are two ICs marked with paint. You will need to check what's written on them to identify which it is. The one I think it is is not near the HDMI ports.

[VaBeachTennis]

Re: Vizio VO420E Main Board

Looking at a better photo on shopjimmy. It looks like there are two ICs marked with paint. You will need to check what's written on them to identify which it is. The one I think it is is not near the HDMI ports.

I want to thank you for the information regarding the "paint marks". Is the standard practice to mark those EEPROMS with paint?

Is this basically using a magnifying glass and matching the part numbers and replacing them? I'm going to practice de-soldering and then soldering these (original) components on the main board I already have. I had to order another main board because the previous owner broke a clip to one of the T-con connections.

[VaBeachTennis]

Re: Vizio VO420E Main Board

I received the EEPROM kit and the donor board. It doesn't look like the vendor put that paint mark on their for pin one on the U18 EEPROM. I took pictures to show what I am talking about.




Any ideas on how to figure where the pin one is on the new eeprom?

When I plugged the "new" main board in to see what it would do, it self tested and showed that I had back-light but I couldn't turn it of when I pushed the power button. Now it does the amber Vizio to the white Vizio with no back-lights or picture. I started to test the Low Voltage Regulators and they all had voltage and checked out well. Then I checked what I think is a Low Voltage Regulator on TU31 and there was absolutely no voltage reading;could this be a problem? I'm going to put the old board back in and take a reading. Any suggestions? Here are the photos below, the U5 had voltage but TU31 didn't:

[budm]

Re: Vizio VO420E Main Board

The dimple at the bottom left corner is pin 1.

[VaBeachTennis]

Re: Vizio VO420E Main Board

The dimple at the bottom left corner is pin 1.

Thank you very much.