Question about Samsung HCN473W 47" Rear Projection Television

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Set won't turn on, timer light flashing and relay clicking

The set first started shading blue and perfect focus would only go as far as 37%. The set then shut down completely and when I turned it back on, the timer light on the front just flashes and I can hear something like a relay clicking in and out as if the t.v. is trying to fire up, but nothing more happens. It just keeps clicking on and off. I purchased a new convergence board from Future Shop and installed it, but it still won't fire up, and it is still flashing and clicking on and off. Any help would be appreciated. I'm hoping maybe it's a fuse or something that burned out in the power supply because of the convergence problem, but I'm stuck at this point. Thanks for your help!!

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  • Jetster Nov 11, 2007

    Thanks Bill, I actually bought the complete board with the stks already installed and I just unplugged the old one and plugged the new one in. I kept myself grounded to the set to install the board, but I put the board in and nothing changed. I'm wondering if the feed resistors that you mention are on the convergence board or are they on another circuit board. I was thinking of pulling the board off where the cable tv wire connects to the set. That seems to be where the relay is that is clicking on and off. Does this make any sense?? Thanks a bunch!!



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From what your describing the convergence amps, one or both, have probably failed and opened in the convergence circuit. That unit takes two STK392-040 amps and the feed resistors to those amps should be tested as well for any change in value.
For a shop this is a routeen job, we see them every day. But for a layman to tackle it - it could be the repair from hell.
The STK392-040 is both heat and static sensitive, so your $19.95 radio shack special soldering gun could ruin them in a blink of an eye.
They're mounted on the board against a large aluminum heat sink on the signal side of the chassis with heat sink compound and they're a multi-pin IC so they're not that easy to take apart and put in. Lining up all the pins to drop exactly where they're suppose to is a trickey task even for a technician, but then we have a few tricks that experience has taught well...
Call around and ask the shops what they charge for changing-out the convergence amps and testing the feed resistors in that circuit.. I would suggest taking the unit to them and save whatever they charge for a pickup and delivery.
Hope this helps!

Posted on Nov 11, 2007


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Posted on Jan 02, 2017

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SOURCE: auto focus

you will need a service tech to alien the convergence in the service mode then perform the perfect focus in the service mode to lock this setting in memory.

Posted on Jun 21, 2008

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So I have an EOS Rebel Xsi, and it has been working perfectly for the last couple of months. I turned it on and tried to take a picture in MF, but then a yellow light on the front starts flashing and...

Sounds like the self timer was accidently set.


Using the Self-timer on the EOS REBEL T3i.


The self-timer is useful when you want to photograph yourself or prevent camera shake caused when the shutter is released.
1. Set the power switch to <ON>.
2. Press < > button.
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: 10-sec. self-timer (The remote control can also be used.)
: 2-sec. self-timer
: 10-sec. self-timer plus continuous shots. After selecting , press <Cross Keys> to set the number of multiple shots (2 to 10) to be taken with the self-timer.)
4. Look through the viewfinder, focus the subject, then press the shutter button completely.
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1 Answer

Will not turn on

check the convergance board for open pico fuses located near the stk amps if they are open the you may have a yolk problem as well. also check the blue gum for cloudy fluid this may be the reason the perfect focus got stuck. if you should get the tv to fire up go to the menu then select reset factory in the convergance menu of the customer menu. this will pull the convegance back to tollorance. the trouble is that when the convegance amps fail customers tend to perfect focus the set and each time they do the convegance memory goes further from tollorance. thus failing the ICs once again. check the pico fuses 1st this is a tell tail sign of those two conditions (yolk, or out of tollorance).

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Timer is lock replace bulb

This set has all kinds of problems--

try the self check:

Mitsubishi TVtroubleshooting
Here's something that might also be useful. After you turn on the set, and getthe regular red blinky lights, hold down the Device and Menu buttons togetherfor about 5 seconds.
The Power light will start to flash in a two digit sequence.
For example, 3 flashes, then 7 flashes = 37.
Here are the error codes, and the corresponding problem:
12 = No error detected, check power supply.
32 = Lamp Cover is open.
33 = Air filtercover is open.
34 = Lamp abnormality
36 = Light Engine (DMD or Lamp Fan stopped)
37 = Exhaust or Lamp Ballast Fan stopped
38 = Lamp Temperature High
39 = DMD Temperature High
41 = Short is detected
44 = DVI cablebetween FMT and Engine disconnected

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I should point out that all projection sets intentionally de focus the blue--the lines if blue should be clear but never as perfect as green or red--this is normal.

I do this here for free so if this has been helpful give me a vote here.

if you need direct help:

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The answer to your question can be found at...

This website

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