Question about Hitachi 43FDX15B 43" Rear Projection Television

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No sound/picture and red power light always on (Hitachi 43FDX15B)

I have acquired the set above (Hitachi 43FDX15B) and when I plug it in, there is the red power light but no picture or sound. I've taken the back panel off to see what's inside and I see one red LED by the video board, and 3 out of 4 green LEDs on closer to the screen. There is also a green LED on the side of the TV on the board where the power cord goes into. I hear the relay clicking when I press the power button but the Red Power light is on no matter what, along with no picture or sound. Any ideas on what is going on?

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  • congnguyen60 Jun 08, 2010

    Thank you for your response. After alot of cleaning, I am now able to turn the TV on and off as indicated by the power light responding to pressing the power button. I hear one click when I turn it on/off like normal, but not many clicks as you had asked. There is still no picture or sound.
    Is it possible that the signal board (JK07092) failed? How do you test if the signal board is functional or not? What about the convergence board (JK07132-A)? How do you test if that is functional?
    Thanks again for your response.

  • congnguyen60 Jun 14, 2010

    Thank you for all of your help so far,
    The TV set is from 2002. I have taken the Convergence STK ICs off from the board to test if the TV is short circuiting there but it turns out the result is still no sound and no picture when I turn the TV on without the STK ICs. Do you know how I go about testing each STK IC by itself to see if they are still good?
    Also, if it is not the convergence ICs that cause the problem, is it 100% that the bulbs are dead?

  • congnguyen60 Jun 15, 2010

    Thank you again for your quick response. I don't know which resistors are the supporting ones for the IC chips, the IC# is STK392-120 and the Convergence board # is DP1X JK07132-A. If there is any way you can let me know which resistors to test, I would greatly appreciate it.
    To test the resistors, do I have to take one leg off the board and then use the Ohmmeter, or use the meter while both legs of the resistor are still on the board? Thank you.

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  • Hitachi Master
  • 8,457 Answers

When u turn the tv on,u hear alot of clicking?That mean the Ballast that help the projection bulb to work is dead.Change the Ballast,might as well change the bulb too.U don't know what is the condition of the projection bulb in.

Posted on May 29, 2010

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  • Chi Chu Jun 08, 2010

    Ask the person that,u acquired this tv from,how long the projection tv bulb been in use for this tv?Like tv been used like 1 1 1/2 years about tv on 4 to 5 hours a day?The bulb life span are over,check the power contact point of the bulb to the tv are gray colors and dulls?Change the projection bulb first,that the first thing,when u do acquired an old DLP tv.These tvs the Tuner signal board are seldom fail.The Convergence board check the two STK ICS,see if the selicon gels that held the ICS together are dries and those resistors ohm resistances colors bands are look dull and worn out.Change the 2 STK ICS and those resistors by buy a convergence kit.These DLP tvs are very commom to have happen at leat 10 to 20 times in the Convergence board 2 STK ICS and those resistors are dead in the tv life span.

  • Chi Chu Jun 14, 2010

    There are no way to test the 2 STK convergence ICS,but those supporting resistors,u can test it with the Ohm meter,if 2 or 3 of the resistors are dead.100% the 2 STK convergence ICS are dead,because that the only way those resistors are dead.

  • carolinatork Nov 29, 2010

    Hello. Im having the same problem, what was the end result?

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1 Answer

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3 reasons for this.

1st reason the fluid is contaminated and thats why u dont get red.

2nd reason no red drive possibly due to a bad colour driver on the base of the tube neck.

3rd reason the tube is out.

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Just a thought, but check all of the pico fuses for a blown fuse. The pico fuses look like a small yellow resistor. Some Hitachi's are famous for having a blown hi-volt ceramic capacitor and a blown pico fuse.
I think the red led on is a short protect indicator, but I could be mistaken.

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This can be caused by a few things. The red crt/picture tube is going bad, which it would have to be replaced, tube can cost anywhere around $195 and up, if it is available. Another problem can be a bad transistor or IC on the red crt circuit board. Either way it should be taken to a repair shop. The average cost for repair could be over $300.

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1 Answer

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Well Dr. Hitachi has a sequence of L.E.D lights in back of set that lights up in accordance to what is wrong with set. there are about 8. so you need to first get someone to turn on and while looking notice which lights up first and goes out first. This tell the tech what is wrong with set. From my experience with Hitachi, I have replaced many Convergence amps which are the big STK's392-*** or something close to this depending on the set. But it most of the time gives some kind of indication before going out. Like color problems not matching up. Red, Blue or Green out of line, mostly on corners of set. If no color problems then next would be sound problems, and vertical problems. Either problem will give a no High Voltage problem like yours. Also it has little pica fuses, sometimes yellow in color. These can be open also. There are many areas to check but if you are willing you can find the problem. Remember to be safe at checking anything with set plugged in. Turn off first. Hope this helps!

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Sounds like you may have a sticking Relay S901 on the power board. Tapping the Relay may Make The Light Go On And Off. The relay part number is FJ00142 if you can find someone to work on the set for you as it would involve soldering in the new part. The number on the relay may be ALKS329 with the former part number being the Hitachi Part number.

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1 Answer

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common fault on hitachi is the -26 volt supply is bad,ther should be voltage markings near or around the led's,find the b+ one thats missing or being pulled down

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