Question about Samsung HCN473W 47" Rear Projection Television

Samsung HCN473w out of focus

My TV went out of focus last night and using the perfect focus, it will only go as far as 4%. I'm not sure what to do from here, any help is greatly appreciated. Thanx in advance!

Jack M Nov 04, 2007

THANK YOU!!! THANK YOU!!! THANK YOU!!!!!

I just finished replacing the IC's on my HCN473WX.......IT WORKS!!!!!! I don't have a lot of soldering experience, but I am very much a handy man kind of guy and things went well.

I have one issue....there are slight vertical lines in the picture (although very minor). I'd say the picture quality is about 90%. I cleaned tv with compressed air, the connections, double checked everything that I did - all looks good.

From what I have read, I need to replace the capacitors on the convergence board - but that is only a guess. Is this the issue? If so, what is the part number?

Thanks for all of your help up to this point!!!
jcotee Nov 25, 2007

This problem (both IC's STK302040) was fixed by a Samsung authorized repair center july 06 - 1 month later the same thing happened - this time they took the set and held it for about 2 weeks - returned it and it ran fine for about 4 months- now the same problem is back. (out of warrentee). I have some expeirence in electronics, and took a look at the CG board and noticed a cluster of resistors that appeared to be burnt (RZ123,124125,126). rechecked solder joints for IC's replaced and they look ok. Does anyone have the specks for this cluster of resistors.

2 Answers

Anonymous

You better do not open the TV unles you know something about electronic. I was trying ti fix mine and did more damage. It is very hard to replace these chips if you do not have proper tools and soldering expirience.

Posted on Aug 10, 2007

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Master
3,130 Answers

The convergence IC's in this TV set are bad. Both IC's should be replaced at the same time. They are labeled STK 392-040. Use only the ones that are not replacements but from a reliable source. The complete convergence board is no longer available from Samsung, so this is why these IC's need to be replaced. You will also need the service manual for this TV set as after vthe IC's are replaced you will need to go into the service menu and do a convergence alighnment. Good Luck

Posted on Mar 27, 2007

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