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Is most likely the cut carriage board has failed then

You can just bypass them by connecting together the two wires on the switch

If the fuses blow, then nothing will print at all. Test those ( the two small SMD ones on the mainboard ) and see if they have blown. If they have replace them, and if you still get problems test the large head transistors as sometimes a blown fuse can cause issues with those as well

As long as it works ok then don't worry :) Half the problem when the go wrong is people either trying to fix them themselves without knowing what they are doing, or they get a bad technician to work on it

Carriage board is the head board. Proper name is print carriage board.

Have you checked the lines from the captop to the pump are completely free and all the connections? and also that the pump is working properly? If the pump doesn't clear the captop properly then ink can sit in it and soak back up into the head. Normally a bad head plate will give you really...

As someone who repairs boards I agree with you. Yes, sometimes you can fix a board by replacing components, if that is what has failed. However, with the VP, lots of people have tried replacing network chips and other parts, and not been able to fix it. There is a known design problem with the...

Did you take the chip from your old board or buy a blank one? If you are using the old one it will still have the firmware on it so you won't need to load anything on

Well done, did all the shorts go as well?

I thought the same :) A reflow is most likely, but that will fail again in time

Odd that AI haven't mentioned that there is a know manufacturing fault with these boards that causes bad connections?

And yet you still haven't fixed it....

Ai again :D basically it is just telling you to check everything

Swapping the main chip is a good way to end up with two dead boards :D I would only really consider it as a last resort. Removing it can be useful to see if the shorts then vanish, but that will only confirm the chip is bad not that the board will work properly with the other chip installed...

More investigation then! This is what I meant when i said it's never as simple as just replacing a couple of components. You need to know why those components shorted, and what else is connect to them in the signal path now

Did you test them for shorts off the board as well? Also when you remove them you need to test the pads to see if the shorts disappear. If they do then the component was at fault, if they don't then the component is most likely fine and the short is coming from something else connected to the...

Totally agree, I also have a degree in EE and circuit design and 9 times out of 10 it is slogging through the circuit and testing and diagnosing

Which ones were they?

Not to mention these days the schematics companies supply often don't actually match the board :/. which just makes it even more annoying. Then you get ICs with a number on them that doesn't exist when you google it!

On most boards I have worked on it has been different components fail. Unfortunately there isn't any one that is more likely to be the problem, which is why tracking the fault isn't simple. As a basic start ; 1) With your IR camera, check for obvious shorts 2) Check electrolytic capacitors for...