Question about Hitachi 61SDX01B 61" Rear Projection Television

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Hitachi Projection TV

The projection TV is 8 years olds. Recently, it takes a long time to display a picture when turned on.(approx 1 min.). The picture is very dim, and appears to be slightly blurry. We have tried Magic Focus, but it doesn't seem to improve it.

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  • ccpmac Oct 17, 2008

    I see no problems with any resistors. I now have no picture at all.

  • ccpmac Oct 17, 2008

    If this is the best advice that can be given I would like my money back.

  • ccpmac Oct 17, 2008

    It went from dim to gone in 4days model 61SDX01B

  • ccpmac Oct 17, 2008

    should all 3 bulbs go bad at the same time

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2.5 ohm resister at R43 center board is bad , it is a 5 watt resister , my tv did the same thing , $.69 part

Posted on Jan 19, 2009

  • johnhenry201 Jan 19, 2009

    2 watt not 5 watt

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Hello ccpmac

Ok your symptoms were the screen take a long time to display a picture and when it does it is dim. Now this can be caused by a few things first lets look at the most likely. That would be the High Voltage supply to the CRTs (picture tubes) since the High Voltage supply to these is common I would like to explain what might be wrong. If the High Voltage off of the IHVT (also callaed the Flyback Transformer) is low this will cause a lost of what is called raster which is the light of the CRTs without video signal. This would mean that your IHVT is bad or the trippler is bad the trippler multiplies the voltage by 3 and sends it to each of the CRTs. Now if the IHVT or the trippler is bad they will have to be replaced. Here is how to identify them the IHVT is usually a large semicircular component with one thich red wire coming from it and two smaller wires also coming from it the two smaller wires will go to what looks like to knob controls (focus and screen, these may or may not be present), now the tripple is attached to the IHVT by the one red wire and the tripple has three red wires (in addition to the one red one connected to the IHVT) coming from it to the High Voltage anodes of the three CRTs. To measure this voltage you will need a High Voltage probe, clip the ground led to the ground of the TV and insert the metal tip under the rubber protectors of the CRT and measure the voltage from the meter, it should be about 20K-40K for each of the CRT anodes.

If the measurement is bad you will have to replace the IHVT and the trippler (find the part numbers and get them from your local Electronics supply wholesale store).

Now if the measurement is good, the only other problem could be the filament voltage of the CRTs this voltage is about 6.3 volts to 12 volts and can be measured with a multimeter set to DC volts. Find the filament pins of the Tvs schematic and check the voltage. If it is bad then you may have to replace the filament voltage transformer (which in some cases is a winding off of the IHVT) or you can use a CRT filament enhancer (take my advice don't use these things).

After all of this if the readings are good then the only thing left is to replace the CRTs them selves, but before you do that you can use a CRT rejuvenator to try to recondition the cathodes, and remove possible grid to cathode shorts of the CRTs. You will need a CRT rejuvenator to perform this task.

Now if you understand evey thing I have told you then you should have no problem because I have assumed that you have a background in electronics, however if you do not have a background in electronics, I would suggest that you get a qualified TV repair person to perform the tasks that I have mentioned here.

I wish you well and hope that this helps you.

Thank you,

Shuttle83

Posted on Oct 17, 2008

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The projection tv use a replaceable bulb. The life on the bulb varies but generally expect around 6 to 8000 hours. However some will last substantially less. Due the age of your tv probably you need to replace your bulb. Your tv need to be serviced.


This will fix your problem.
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Posted on Oct 17, 2008

  • Pablo Csaky
    Pablo Csaky Oct 17, 2008

    I suggest to buy a new one instead of try to fix it due the cost

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Has the image gotten dimmer over a period of time or is this a sudden development? Also, could you list the model number of is it the model in the heading? If posts didn't wind up in the wrong thread I wouldn't question the model.

Posted on Oct 17, 2008

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Well..I would say that this one has done a majorly long run..and with the cost of replacement components..well..it may be time to retire this unit

Posted on Oct 17, 2008

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It seems that yo got the problem on the video output module.. try to look and check for any defective resistor on this area..

BTW.. when the picture come out did the color was normally detailed..?

Posted on Oct 12, 2008

  • micromaster
    micromaster Oct 17, 2008

    check for any bad soldered on the board.. this can be another cause.

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