Question about Hitachi 55HDT51 55 in. HD-Ready Plasma Television

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Hitachi 55HDT51 flat screen does not come on

I have the 55" Hitachi Plasma with the seperate control moduale.  The green light comes on when I turn on as well as on the tv screen and then the screen clicks and goes to red on the tv only.  Sound still plays through TV but no screen.  If I manually turn screen button to off and on the screen will flash quickly then click off and show the red light at bottom.  Any suggestions as to what it might be.  $4300 tv in 2 years problems???
Thank You

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6 Suggested Answers

SOURCE: Hitachi 42EDT41A

This happens to me about every two months. I unplug the TV wait 30 seconds and it comes back on. I hope that works for you - it's a much cheaper solution:-)

Posted on Dec 14, 2007

  • 29 Answers

SOURCE: Hitachi Plasma TV model P50H401

I think you have problems with the digital main PWB.

If the power PWB failed, turn off and change the pilot ligth to red.

Posted on Nov 28, 2008

  • 2 Answers

SOURCE: Hitachi 50" Plasma (P50X01AU), power light comes on but no screen

Hope you already resolve it, if not, here what I went through 1. Try to get a service manual for your model ($10-18) from or similar place. 2. Open the back and follow instructions how to remove and test the SDR-D and SDR-U board on the far left (take one off, see if you could see half the picture). Inpsect the chips on those two boards, you might be able to spot the burned out holes (that would be the defected board, seemed to be a known issue for particular models) 3. If it is the board, go to ebay and get the pulled out board replacement ($70-90) I fixed my 50 inch plasma this way

Posted on Jun 12, 2009

  • 1 Answer

SOURCE: Problem with Hitachi P50H401 Plasma TV - Will not

I have the same model, P50H401 and it developed the same problem two days ago. This set is 2 1/2 years old in service, being purchased in December 2007. The original manufacture date was October 2007.

The set was turned on and operating at the time and then promptly shut down by itself. The front blue LED power indicator began flashing four times in a loop or cycle.

The flashing LED sequence in this instance points to a problem with one of the following boards: PSU, X-Sus, Y-Sus or SDRs (there are two SDR boards, SDR-U and SDR-D, both are connected off of the Y-Sus board on the left hand side of the frame when rear facing). The set shuts down to prevent further damage to other boards or components.

I could power cycle the set but it would shut down after after a few seconds. Power LED would stay solid, I could hear the PS relays switching, and audio would output through the speakers. Then as the screen was just about to illuminate, the entire set would just shutdown. The blue LED would again go into the 4X flashing sequence.

I could not visually detect any signs of severe component damage on the main PS board. The two large electrolytic capacitors which have been mentioned as problematic in other threads seems fine. The where slightly raised on the top surface, but not blistered or completely blown open.

The only indication of component damage that I could detect visually was on one of the small surface mounted ICs on the SDR-U board.

Through reading other posts on this site, I learned that I was able to remove the suspect SDR-U board and then re-power the set. Doing this proved that the PS, X and Y Sus, and the SDR-D boards where o.k. The PS held, and the lower half of the screen illuminated. (I would only do this for as brief a period as required to determine if the the other boards would function and the screen would illuminate. Do not pro-long operation in this state so as to not cause further damage.)

It was somewhat difficult to locate the correct SDR-U board. My local service rep did not have one in stock, and the Canadian parts distributor was also out of stock. They estimated 10 - 14 business days to order one up from the U.S.A. (Hitachi closed their consumer electronics division in Canada back in 2009.)

By chance, I checked with another service rep in an adjacent town. He had a board for the P55. We did a visual comparison on the two boards and determined that it would be compatable.

The easy part was removing the defective SDR-U board and installing the replacement. The hard part was re-alinging the three ribbon tabs into the respective connectors on the SDR board. Be careful with these ribbons. The other end of each is fused to the plasma panel screen, so if you damage them, your screen is rendered useless.

I initially had the same problems as others have posted with having black or gray lines on the screen when the SDR-U was replaced. After gently adjusting the position of the ribbons as they are seated in the connectors, the lines disappeared. This was a slow and frustrating procedure, but it worked, Be patient.

Posted on Jul 03, 2010

  • 9 Answers

SOURCE: When I turn my hitachi flat screen tv on,

you are not getting a signal change soure ie box or dvd player and input jack then try

Posted on Aug 20, 2010

  • 1267 Answers

SOURCE: have a 55 inch hitachi plasma tv. The picture

Seems as if your high voltage power supply went kaput. This happens sometimes see the complaint


See: for a list of parts and you can see if it is worth fixing

Posted on Dec 01, 2010

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