The convergence went bad on my 47" Samsung HD projection TV, I believe it is a model HC-P4741W. I replaced the sanyo stk-394-250 ICs without really checking over the board first (of course). When the convergence issue was not fixed, I went back over the board looking for faulty resistors, I didn't find any open resistors, but I did find one crispy capacitor near what I think is called the "flyback transformer" looks like one of these:
http://www.bombayharbor.com/productImage/0290599001251451176/Flyback_Transformer.jpg

The capacitor is one of the small ceramic ones, and any type of identifying marks have been burned off (the thing literally fell apart in my hand). I could read the number printed on the circuit board though, it is C407S.

Question 1: Does anyone know where I could find a schematic of this circuit board so I can find out the specs of that particular capacitor?

Question 2: Could this burnt out capacitor be the cause of my convergence issue, or is there likely another cause somewhere?

Service Manual parts list doesn't have C407S only C407, probably not what you looking for:
C407 C-FILM,LEAD-PPF;100nF,5%,50V,TP,7.3x4.0x

Found C407S on the circuit diagram just says 271 2KV, whatever that means. There appears to be an identical 271 2KV nearby called C411.

Suggest check the resistors around the convergence IC's again. They are in parallel and should get readings less than 10 ohms. When you find a reading like 10-100k, one of them is out. RZ128-137, RZ141-149, RZ151(A)-156(A).

I found a C407S on a website that sells parts for LG TVs, it listed it as a 270pF 2KV capacitor, that might be similar. It could also be C4D7S, it is a little hard to read.

Thanks for the tip on the resistors. I can't believe the set even turned on with the capacitor looking like this.


Edit:
Found the C411 you mentioned, it has 271k 2kv printed on it. Not entirely sure what this means, but I have a very nice parts supplier in the area that can probably help me out (ICC-North). Thanks for the help.


I'm getting 2.2ohms on the RZ128-137, Rz141-149, and 74.6ohms on the RZ151(A) - 156(A), so those should be fine, right?

I'm getting 2.2ohms on the RZ128-137, Rz141-149, and 74.6ohms on the RZ151(A) - 156(A), so those should be fine, right? Yep, those are good

Is it possible that this malfunctioning capacitor fried something in the new convergence ICs? What could cause a capacitor to fail this badly? Could it have burnt out something else on the board I can't see?

271 would be 270 pf. The third digit is the number of zeros to add to the first 2 numbers, like 271 would be 270 pf and 272 would be 2700 pf etc....

Mike T

I got the replacement capacitor today, installed it, and it seems to have fixed most of the convergence issue. The screen is no longer zoomed in, but it is still skewed. The previous owner said he messed with the service menu to try to adjust the convergence manually, but he couldn't read the menus very well because the picture was zoomed in so far. I tried the reset option in the service menu, but it only resets the regular settings, not the service menu ones. Can I find the default numbers for all the V shift, h shift, linearity, etc. in the service manual if I purchase one?

EDIT: Found someone on ebay that was willing to email the PDF of the service menu, it contained the default settings, will update later on whether or not it worked.

EDIT2: Problem solved. Thanks everyone!