Question about Samsung HCN473W 47" Rear Projection Television

4 Answers

Help not sure

This problem on model HCN473WX was fixed by a Samsung authorized repair center july 06((both IC's STK302040 on convergence ) - 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 warrantee). I have some experience 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.

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  • 3 more comments 
  • jcotee Nov 26, 2007

    I was wondering if the IC's could possibly be blown again, and if so how would know?

  • jcotee Dec 20, 2007

    Thanks for the start - I finaly got the Service manual for this TV. I traced the problem back to an open fuse FD102S - rechecked/ replaced the resistors that looked to be burnt out. Replaed the fuse too.
    Tried the board again and the same same thing happened.
    Checked the fuse FD102S and once again it's open.

    Any thing else I can look at?

    Thanks JIm

  • jcotee Dec 21, 2007

    Thanks troylove11 - I took a good look at the board under a strong magnifying/light - what I found was not a surprise. At 2 of the 3 areas that had burned resistors (replaced them all anyway) I noticed that the foil had was pulling away from the board. I checked to make sure that the foil was not damaged and it conducting to the next component.

    I looked at every component in the the circuits with the burnt itmes and the fuse - this was all in the same major cluster.

    It sounds more like the Ic's at this point don't you think? But shouldn't there be a short in some cap/resistor to make the fuse trip again.

  • jcotee Dec 30, 2007

    Thanks for all the help - I did get the set working again - it was a mix of the resistors that were burnt as well as the fuse that blew - but I did as I was told and replaced everything in the cluster that looked to be the problem.

    I don't know if I have to give credit to anyone - but I will just tell me how.

  • jcotee Dec 31, 2007

    Once again THANKS to everyone that helped me find a solution to my problem. The support I received was right on the money. Response to my post were fast and to the point.

    I will definitely pass the word around that this site is money well spent! To get the kind of help I got - at the time I needed it - from so many experts makes this a value you can't beat.


    What I did was REPLACE:

    • both the IC's STK392-040

    • fuse - FD102s - (was open)

    • caps - CZ140, CZ141,CZ117,CZ138

    • resistors - RZ123,124,125,126,127,128,130,130a,131,131a,

    Repaired damage to foil (at 2 areas where the resistors burnt)

    Checked all component solder joints (new and old)

    Installed board and TV picture was better than the repair center FIX.

    Ran perfect focus - then did a convergence adjustment to top it of.


    Thanks guy for everything!!

    I can't figure out were to apply the rating/credit once I get to my account.



4 Answers

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  • Master
  • 1,694 Answers

If you will take a little time to read my solutions regarding
Samsung convergence repairs, the # 1cardinal rule is never use
seconds when replacing STK392-040 IC's ! Absolutely,positively
with no doubt, use OEM quality or better IC's !! First quality =
name brand = I use Panasonic only when replacing STK392-040
and I have had ZERO re-calls........I have replaced dozens of pairs for my customers....yes, they paid more for parts,but their
sets are still working to this day......Stop inflicting unnecessary
damage........START with first quality IC's......then check fuses
and resistors and traces, etc...................................T.

Posted on Dec 22, 2007

  • 2 more comments 
  • Vista Electronics Dec 22, 2007


    I don't know where you live in USA, but here in Calif. you have

    extended warranty on inferior parts installed by original servicer.

    After completing your repair, ask him to re-imburse you for parts's the least he could do....................T.

  • Vista Electronics Dec 25, 2007

    When you have time, can we get an update ?

  • Vista Electronics Dec 30, 2007

    Give the highest rating to the one who gave you the best

    guidance for solving your problem..................

  • Vista Electronics Dec 31, 2007

    Remember one and all .....THE MOST IMPORTANT DECISION IS........First grade quality STK392-040 ONLY ! NO GENERICS !

    I USE PANASONIC ONLY PART # C5AA00000107.........T.


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  • Samsung Master
  • 456 Answers

I think the voltage is coming to that resistors are too high and the samsung repairmen do the same so completely identify the voltage of ICS and then put newer one

Posted on Dec 20, 2007

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Hi i have found that when i need the spec sheet and specs for any tvs i have found this site brilliant and had everything i needed here it is you might need to download this to open the file i did but you might have similar one on yuor comp all ready let me know how you get on hope this is some help

Posted on Nov 26, 2007

  • paul proctor Nov 26, 2007

    The possibility is they are blown as when the resistors when this would have probably caused the ic to go as well did they replace the resistors the first time round or just the ics as if they just replaced the ic their is the possibilty that their was a bad solder on one or a couple of the resistors this causing the ics to go you might be lucky and get away with replacing the resistors but the chances are the ics need replacing as well.

    didnt you find anything on the link i gave you was it any help?

  • paul proctor Nov 26, 2007

    you would have to trace everything back from the ic's and check all resistors this is what should have been replaced the first time along with the ic's this is probably the route of your problem you will need to check everything as in troylove11 post


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  • Master
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This maybe the problem why it is repeating. They didn't change all return resistors. they are different sizes all are probably smaller than 100 ohms. You will need the exact size and there are caps that maybe bad and maybe fuses also

Posted on Nov 26, 2007

  • 1 more comment 
  • Lashawn Robinson Nov 26, 2007

    1. Possible if you ran set long enough to overheat

    2. I would try resistors first and if no improvement

    3. Then replace amps again and this time resistors.

    4. Resistors are very inexpensive so you can get 2 or 3 of each ones.

    5. Amps on the other hand are not.

  • Lashawn Robinson Dec 20, 2007

    If fuses still blows, then there is still a short somewhere. I would look around for another fuse open or bad resistor. Now it could be what you don't want to hear. A bad amp again. This is why all parts need to be changed at the sametime.

  • Lashawn Robinson Dec 21, 2007

    Jcotee, I have a variable a/c powersupply that I use in this case. If you have the resources, I would get the schematic, get the parts again change all of them out again and before plugging to your home outlet, run on the a/c VPS and check the voltages that the schematic gives. This is the life of a Technician!


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You can also try , they carry OEM or better parts. They will also include instructions and the other components that you may need.

I hope this
information allows you to resolve this issue.
If you need further assistance please comment to this post and I will try to help you further.

Thanks for using FixYa

I have attached some photos of really bad convergence problems; your picture may not be exactly as bad as these.


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