Question about Samsung HLP5085W 50" Rear Projection HDTV-Ready Television

3 Answers

Samsung HLP5685 W

TV Tech,

I have a Samsung HLP5685W, all of the sudden the picture and sound went out. When I unplug the TV and plug it back in I only get a Green light on the front...

I measure 330 volts DC going into the Ballast but 0 volts coming out right before the lamp. Do you think the ballast needs to be replaced?

I am just wondering why the sound isn't working and why I am not getting any kind of flashing lights on the front of the TV

Thanks

SoDak

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  • SODAK Mar 09, 2008

    I have pulled out the ballast and it is **t shorted...infact i guess it is open or at least has very very high resistance.

    I would like to assume the ballast is bad and hope that fixes my problems...but am still concerned about the fact that there is ** sound and I have ** blinking lights on the front, but will get the board ordered and let you k**w if it works

    Thanks

  • SODAK Mar 14, 2008

    Well I got bad news, I got the new ballast today, and have the exact same symptoms.

    The old ballast was not shorted and neither is the new one.

    When I first plug in the TV I only get a Green light on the front it does not do its normal power on sequence ending with the smiley face on the front. There is no sound and I have no blinking lights on the front, just a solid Green light.

    Has anyone seen this kind of problem before?

    Thanks

    SODAK

  • SODAK Mar 20, 2008

    Hello,

    I have a Samsung HLP5685W that won't come on... I get no Audio or Video. In fact it won't boot up properly, normally this DLP goes through some self checks then has a smiley face on the front display after that.

    Now when I plug it in, I get a Solid green light on the front and nothing else. All of the voltage lights on the circuit board are green, so I have 12 volts 5 volts and 7 volts. I have 330 vdc going into my ballast but no output to the bulb. I change the ballast and no change...same symptoms.

    The fact that the TV does not boot up properly and that I have no flashing red lights makes me think that I have a logic / processor problem and not something easy like a ballast or bulb.

    I am hoping that someone can help me.

    Thanks for your help

    SODAK

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3 Answers

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  • Samsung Master
  • 8,617 Answers

.
1. Standby LED on Digital Board ON (5V)
2. Power on signal from keypad/remote to Digital PCB.
3. Power ON signal generated by Digital PCB> Analog PCB> PSU
4. All other voltages turn on.
5. Digital PCB tells fans to turn on.
6. Digital PCB tells DMD PCB to turn color wheel on.
7. DMD / digital PCB’S check feedback signals from
fans/ color wheel.
8. If OK, Digital PCB Tells ballast to turn lamp on. LAMP ON.
9. Digital PCB then checks “lamplitz signal” from ballast
for status OK.
It can therefore only be the digital PCB orthe DMD PCB This is the sequence of events that must happen for your set to power up. If I can help you further please let me know.

Posted on Mar 20, 2008

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  • Master
  • 4,234 Answers

Believe it or not, a bad lamp can cause this too. Have you replaced the lamp? These sets have all kinds of safety circuits built in to prevent major damage. Unfortunately, these circuits sometimes make diagnosis tricky at best. Try a new lamp and keep us posted.
Dan

Posted on Mar 20, 2008

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  • Master
  • 3,587 Answers

Yeppers..the ballast has taken early retirement...can you unplug the ballast output, and see if it's running into a short condition?

Posted on Mar 09, 2008

  • Patrick Michaels
    Patrick Michaels Mar 09, 2008

    this should be interesting.

    thanks for using fixya

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