Question about Hitachi 50UX26B/27K 50" Rear Projection Television

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Will not come on Hitachi 50UX26B/27K

Started by turnining itself off occasionally. Now it will not come on at all. There is one interior red LED on when I try to turn the set on. Red light in front will not come on. I think it is a 1997 model. Need an idea oh how big an issue this is and if it is worth fixing and how to fix.


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  • ryounglas Nov 24, 2008

    Hitachi model 50UX26B manufactured Sept. 1996. No problems for 12 years and today it went from shutting down intermitantly and able to turn back on after a few minutes to won't turn on at all. The red indicator light on the front panel does not come on at all, but the red led on the interior circuit board will blink three times and then stay on, but no picture, no sound and no front indicator light. Turn the set off and it clicks and the red led on the interior board goes off. Seems, from looking on the internet, that a lot of people are having the same problem, but no answers are found. Anyone have a fix?

  • Anonymous Dec 06, 2008

    I have the exact same problem - How much $$ to have a Tech fix
    seems like you have to know what you're doing



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I have the same problem. Having a service tech come Satuday. How much did it cost??

Posted on Sep 18, 2013

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Apologies for the delay in responding. I was made aware of your concern just recently.

To your concern of a Hitachi 50UX26B/27K; If I understand your post correctly:

  • there is a red LED lit inside the unit;
  • the front LED will not lit up;
  • the unit is technically a dead set.
Offhand, the unit is in protective mode, that is it prevents itself from completely turning ON so as not to further the electronic damage.

You need to know: extent of possible damage, repair cost and step by step for a possible DIY (do-it-yourself). This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY, perhaps your best bet would then be to seek the services of a qualified professional.

If you are considering a DIY, the best procedure would be to follow the checklist/diagnostic steps as outlined in the service manual. Probable causes among others are:
  • convergence ICs STK 392-110 (very often). Further, pls check for burned/discolored resistors within the same area;
  • leaked/blistered capacitors especially on the main B+ line. For a 1997 model very likely;
  • startup circuitry in the power supply section (I901 and D907);
  • power relay/driver;
  • low B+ regulators;
  • vertical IC plus zeners of vertical shutdown circuitry
  • HD, HDT, HOT/FBT (not that often).
A few notes that might be of use to you:
  • should you have verified the STKs as defective, the STK392-150 or STK392-180 are no better then the STK392-110, the STK392-120 is better, but if you want the very best IC, pls use the STK394-160. Additionally most online stores supply replacement instructions together with the parts upon purchase. Based on a Hitachi Service Bulletin, a "replacement kit" must be used with part number X480306 inclusive of the STK ICs, all resistors needed;
  • if it were the convergence ICs, parts would not be more than 50~80USD. If a professional would work on the unit, the service fee (a couple of hundred dollars) would relatively be higher than the parts cost. If you are considering seeking the services of a qualified professional, it may be to your advantage to avail of the repair facilities of a Hitachi Service Center;
  • here is an illustrated STK replacement tutorial for another brand/model;
  • a free downloadable service manual for Chassis AP63
  • here are some repair tips for Hitachi 50UX versions.
Of course, anything else could possibly be affecting the unit other than the convergence ICs. Again, the diagnostic procedure as outlined in the service manual should guide you.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.

Posted on Nov 04, 2008


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