Barco 909 power on problem

Yeah that is a pretty common thing i see on my 2 here as well, but never really that far out of the lower voltages, and that is bound to be causing some sort of issue if indeed it really is that far off, its almost 1/3rd out of spec.

There is something somewhere pulling that up a bit, id be interested to see what it says with the convergence/astig/focus boards disconnected, but my guess is itll be the same.

Depending on the version of the controller there is a reg that is fed by a pretty high voltage on the earlier versions, on later versions this was changed. It caused the whole row of regulators at that end of the board to run really warm. There is a mod for it, i reckon Hulio will know what it is, i have the info too but its on my PC and im on my phone at present.

This alone will not be the problem, but could be part of the cause.

The regulator in question here is a 7912 if i remember correctly, and i cant remember the order those regs are laid out, so i dont know how close it is to the reg that runs quite hot. 

When it comes to component level diagnostics, and the explaination/guidance there-of, there is no man better at this than Mastertech, ive seen some of his exploits and it is nothing short of genius knowledge of the whole lot and how it should be done. Curt might have a lot of experience replacing boards til the set works, but he isnt even close to the same league on this level of repair.

Itll be obvious if yours has it, its done underneath.

Well.
The tray of 909 is here now.

This is the situation:
A resistor R208 (edit: SR2) in the convergence board is broken.
In the controller (also in the unit that I own) there's a modify, perhaps performed by Barco.
This modify is broken.
Below I put some pictures from my controller.
We must to know the value of all components because in the Stefano's controller all components are bad.

Now I can't read the documents but I'm afraid that the components that we seek are not listed.

I've seen the list of components now.
The R50 resistor is described as 390 ohm not SMD.
In the controller owned by Stefano (but also in mine) the resistor R50 is replaced by 3 components.
There are two resistors in series between the contacts of the R50.
These two resistors form a kind of small roof at the apex of which there is a capacitor that connects to another nearby capacitor.
Look at the photos I posted before.
In your opinion, is it possible to simply weld the 390 ohm resistor in the place of R50 without replicating the three components I mentioned above?

I want to clarify that the intervention that I would like to do now is not to solve the problem of wavy lines but to remedy an accident occurred to Stefano while he was working on the controller. In fact the resistors and the capacitor of which we are speaking have been inadvertently detached.

There were a modification done on the schematics, the resistor and the capacitor are well listed, as R410 and C410 and as "Manual" instead of SMD (depending on Index)

In previous revision, they were implemented in the PCB, then removed from the schematics.

Older : New design



After : Old design



It'spossible these compnents needed to be even closer of each other. Edit : They added it since index 1
So as as they are well listed in the partlist, that's well intended, and should be redone that way.

Robin