Re: Vizio M3D421SR

Try searching for m3d420sr mainboard repair I know I couldnt find it under 421 for some reason.

Re: Vizio M3D421SR

i got my main board back today and the tv is working fine. after talking to the repair guy from the ebay service and thoroughly inspecting the board im pretty sure they just reflowed the solder on the processor much like you would do to a xbox360 with rlod or ps3 with ylod. they also changed a voltage regulator but the one they changed i had already changed. it was the 1117-18 regulator which i had swapped with one from a 360. i have encountered other main boards with the solder issues as well. infact it seems like this is an issue amongst all surface mount processors...

Re: Vizio M3D421SR

No I have not solved this issue yet. I decided to use the $89 repair service on ebay and am waiting for them to finish. Ill let u know how it goes

Re: Vizio M3D421SR

Has anyone fixed this issue? I have a unit with the exact same problem and have searched high and low for a solution. I Have tested ps voltages and the voltages on the regulators. one regulator was low and i replaced it to no avail. there is still another regulator which is a little low. it reads 3.28 out it is supposed to be 3.3 is that too low?

Anyone have any technical documentation for this or related models?
m3d420sr, m3d460sr, m3d550sr

the motherboards are almost identical physiclly with the 420 and 421 being the same. ...