Question about Samsung HCL4715W 47" Rear Projection Television

1 Answer

Flashing power light

I just replaced the horizontal output transistor and unfortunately it did not fix the problem. What else could be wrong with it?

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  • 7 more comments 
  • Andrew Hawkins
    Andrew Hawkins Mar 09, 2009

    My IC801S is getting pretty hot. Also, I'm going to check with my scope. where would be a good spot to ground? Thanks

  • Andrew Hawkins
    Andrew Hawkins Mar 09, 2009

    So, I just started checking the voltages. I started with the 34V and they only read 20 volts. Then in the midst of rearranging my probe I accidentally touched the ground collar on the probe to the heat sink of IC801 and it popped the fuse. Is there supposed to be live voltage on the heatsink? Anyway, I don't have any fuses for it and I will have to pick some up. Thanks for your help again.

  • Andrew Hawkins
    Andrew Hawkins Mar 09, 2009

    Since I have to wait for my fuses to get in, what are some suspect parts that could be bad with power supply? I in the past I've gone through to check for shorts but I couldn't find anything unless I wasn't looking in the right spot. I've check over both the power supply board and the sub deflection board. I will be rechecking them in the mean time. Could the signal board possibly have a problem too?

  • Andrew Hawkins
    Andrew Hawkins Mar 11, 2009

    So, I checked voltages and all of them were there..some of them were a volt or two under but they were all there. This time I checked with a DMM so I'm not sure if there is some AC on it but the DC voltages seemed to be there.

  • Andrew Hawkins
    Andrew Hawkins Mar 11, 2009

    So, I checked voltages and all of them were there..some of them were a volt or two under but they were all there. This time I checked with a DMM so I'm not sure if there is some AC on it but the DC voltages seemed to be there.

  • Andrew Hawkins
    Andrew Hawkins Mar 11, 2009

    I also checked over the regulators that I could find before I put the boards back in and none of them seemed to be shorted.

  • Andrew Hawkins
    Andrew Hawkins Mar 11, 2009

    I just unplugged each board individually and it still had the same problem

  • Andrew Hawkins
    Andrew Hawkins Mar 13, 2009

    Do you have any more ideas on how I could trouble shoot this? I guess my next step that I think I will take is pulling the signal board since it is the only one I haven't checked yet and look for a shorted component. Thanks for all your help thus far!

  • Andrew Hawkins
    Andrew Hawkins Mar 25, 2009

    Hey Slinteriors,

    do you have an email I can reach you at?

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  • Samsung Master
  • 8,617 Answers

Check for these power supplies on the Sub deflection board first on the right side of the board there are two Connectors one is a 12 Pin connector CN803 From the top of the connector the wires should read;
30V
Gnd
Gnd
-30V
8.5 V
8.5 V
Gnd
Gnd
-8.5 V
Gnd
Gnd
13.5V
Next is the connector below that one which is a 10 pin connector CN802 they should read
11.7V
11.7V
N.C
Gnd
CTL
Gnd
34V
34V
Gnd
Gnd
Next is a 14 pin connector on the top left side of the board CN801 those should read
34V
34V
Gnd
Gnd
-8.5V
Gnd
8,5V
8.5V
Gnd
13.5
NC
12.5
12.5
Check those supplies and see if they are correct or if any are missing

Posted on Mar 09, 2009

  • 3 more comments 
  • Sonny Berry
    Sonny Berry Mar 09, 2009

    Pin 5 on IC801s is gnd so you can use that

  • Sonny Berry
    Sonny Berry Mar 09, 2009

    yes the heatsink is live for IC801

  • Sonny Berry
    Sonny Berry Mar 09, 2009

    I would check regulators and capacitors as those are the most likely components that will fail . I would say that the problem is on the Sub deflection board as that has all the operating supplies on it then the power board

  • Sonny Berry
    Sonny Berry Mar 11, 2009

    Lets try to see if you may have a shorted CRT. Unplug one crt drive board at a time and try ppowering up the set with the CRT drive board off the end of one tube at a time, then reinstall that one and disconnect another if it powers up after any given drive board is off the CRT is shorted. Dont disconnect any wires just let the drive board be suspended off the CRT socket.

  • Sonny Berry
    Sonny Berry Mar 25, 2009

    you can reach me at slinteriors@yahoo.com

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