The Sony KP-46WT510 convergence problem, need help

Hi Everyone

I’m trying to fix my Sony KP 46WT510. This is the common "3-D, hourglass" problem that this model is known for, and has the solution posted here and elsewhere about replacing the IC Convergence Chips. I know of that solution and have implemented it, but I'm still having problems.

So at first, I’ve replace the two convergence chips. I also needed to replace two 3.5 amp picofuses, one for each chip. These fuses are labeled as P58001 and P58002. They are the “same” picofuse for each of the two chips (meaning they are located in the same relative position on each of the two different IC chips).

One of the pico fuses keeps blowing out. It is the one that is traced to the GH_OUT output. As I understand it, one IC chip controls the RED convergence and half of the GREEN convergence, while the other IC chip controls the BLUE convergence and the other half of the GREEN. It is the BLUE chip I’m having problems with.

After replacing and blowing this same picofuse three times (P58002), I finally noticed that a whole row of resistors next to it were burnt out. I do not know when this occurred, but I’m assuming that this is why the picofuse keeps blowing. There are 5 resistors that are burnt, all next to each other and (I assume) are chained together. They are designated as R8046, R8053, R8060, R8064, R8067.

A have a few questions:

1) Am I right in assuming that the burnt-out resistors were the reason my picofuse kept blowing out, or is it the other way around - that the resistors finally burnt out because I kept trying new picofuses and they finally had enough? If I am wrong about the resistors, what is causing that picofuse to blow? A short? I know from reading about this that resistors blowing is pretty rare for this type of fix, so I’m worried why so many of mine blew out.

2) I’m operating under the assumption that my RED IC Convergence replacement chip is functioning since 1) none of the fuses have blown since replacement and 2) I am able to move the RED cross-hair in the Convergence Setup Screen in all directions. Is this a correct assumption? Curiously enough, I am also able to move the BLUE cross-hair in the Convergence Setup Screen in all directions as well, which confuses me since that chip’s picofuse has blown out every time. What is the best way to know if my RED IC Convergence chip is good? What is the best way for me to know that my RED chip is doing it’s half in controlling the GREEN like it should?

3) My plan of action: Replace all of the resistors listed: R8046, R8053, R8060, R8064, R8067, with 4.7 ohm, 0.5 watt resistors. The only difference is that the resistors I got have a 5% tolerance band while the resistors I’m replacing have a 2% tolerance band. Is this OK? Then I plan to replace the 3.5 amp picofuse (P58002) for the fourth time. I have already de-soldered my replacement BLUE IC Convergence chip so I can resolder it and make sure it is clean. I plan to do that part last. Is there anything I should look out for or know, or do you think this is the right plan of action?

Thanks so much for any and all help anyone can provide. Very much appreciated.