Hi,
This TV has problems with the input signals (the tv shows the "no signal" message when tuned to each of the inputs except composite video.). For some reason it's not processing it right. For example, none of the input interfaces work or work appropriately. None of the HDMI work. The AV analog, dont work neither. The composite video (Y pb/cb pr/cr) interface does display video normally, although it doesn't produce audio. Have not test the other input ports.
I assume it has to do with the primary video processor chip on the motherboard, which in fact is a bga package.
I tried my luck doing a light reflow, before doing a complete reflow, of the chip at about 200c to see if it'd help but it didn't make a change.
Other than checking the fuses and looking for any visual damage I have not tried anything else.
It's this board here (3642-0872-0150):
https://www.shopjimmy.com/vizio-3642...for-e420vl.htm
Here is a picture of what's under the heat sink.
This TV has problems with the input signals (the tv shows the "no signal" message when tuned to each of the inputs except composite video.). For some reason it's not processing it right. For example, none of the input interfaces work or work appropriately. None of the HDMI work. The AV analog, dont work neither. The composite video (Y pb/cb pr/cr) interface does display video normally, although it doesn't produce audio. Have not test the other input ports.
I assume it has to do with the primary video processor chip on the motherboard, which in fact is a bga package.
I tried my luck doing a light reflow, before doing a complete reflow, of the chip at about 200c to see if it'd help but it didn't make a change.
Other than checking the fuses and looking for any visual damage I have not tried anything else.
It's this board here (3642-0872-0150):
https://www.shopjimmy.com/vizio-3642...for-e420vl.htm
Here is a picture of what's under the heat sink.
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