Question about Hitachi 55HDT79 55 in. Plasma HDTV

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Hitachi 42hds69 blinks 8 times and powers off and powers on, cycle repeats

Hi,
My two year old Hitachi 42hds69 blinks 8 times and powers off and powers on (9th blink), cycle repeats. Please help me.
Same problem on 55HDT79.  No problems for 1.5 years, but 1 week after installing Comcast CableCard this problem shows up.  I tried two HDMI sources and one composite source  (removed cablecard!) but the problem persists.  Set stays on for only about 8 seconds and isn't booted enough to respond to the remote attempts to reset (menu + menu  + 8 + Select) though sometimes I can get the top menu selections to show up just before it goes off again.  I got the service manual online and noted the Digital Main Board in the back (can see through holes or can remove metal back) has 5 LEDs to indicate booting process and "Device error check" ... But the sequence described is not at all what I see, and the last longest state it stays in has 3 middle LEDs lit, which does not correspond to a pattern that describes any devices (it is pattern 14 but there is no device/circuit/remark there).  I suspect the Linux software somehow got toasted trying to download the cablecard guide information (which never came up) and is now endlessly rebooting itself.  I am very disappointed that there is no complete factory reset button (or combination of hard buttons), as clearly using a menu system to accomplish this is useless if the system isn't coming fully up and remaining stable.  The set responds to volume and power buttons and not much else during the 8 seconds or so of powering up (BTW, owners manual explains blinking blue indicates "Off, turning on").  If I turn power off, the display no longer powers on, and the front red LED turns on, but the Digital Main Board troubleshooting LEDs continue to cycle just like when the display and front blue LEDs are doing their cycle/blink thing.

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  • bosbrucec Jul 31, 2008

    I had already researched this cycling/blue blinking issue on the AVS forum, and the threadhttp://www.avsforum.com/avs-vb/showthrea... (not the thread suggested here which has no relevant issues) does talk about similar issues but the posters did not solve the issues themselves (and they were intermittent unlike my apparently permanent issue) so their explanations are not at all clear. It seems the main digital board is the likely problem, but that part (JPS50763) costs $450 (though I could get one from a 55HDS69 which should be the same except USB and TV Guide for $100 - JA06715), and I continue to hope someone can tell me the secret key combination to reset my board to factory without the onscreen menu system.

    Anyone out there have experience with these 2006/2007 Hitachi plasmas?

    Cheers,
    Bruce

  • bosbrucec Jul 31, 2008

    Just as a clarification, I have done as hard a reset as possible, unplugged for hours, pressing the (hard) power button and soft power buttons on while unplugged to fully discharge any possible capacitor power, leaving off for hours after that,... I have taken the unit apart and checked all connections (brilliantly put together!) with the same results, I have tried different HDMI/composite sources,... I am looking for information from someone who has worked with these Hitachi (2006/2007) plasmas (42/55 HDS69/HDT79/HDX99) who hopefully knows a trick to fully reset everything to factory on the board without going through the on screen menu system since the system is up long enough to display top level menu for < 1 second only, or at least someone who has seen this specific problem and knows for sure (I am 70% sure from what I have read) it is the main digital PWB. And also if there are issues with JA06715 (6 months older Part # main digital for HDS69, as I can do without USB/TV Guide/power swivel)...

  • bosbrucec Jul 31, 2008

    Yazz226, Thanks for the additional info. However, the service manual I have says Menu+Menu+8+Select to find FACT RESET option, but you say it is MENU + 4,7,2,5 (Is that for the 2006/7 Hitachi plasmas?). I will try it; however, as I said, the set is booting up during most of the 9 seconds audio and video are working, so it is unresponsive to anything but volume and power on remote until the last < 1 second. I can sometimes hit menu at the right time to see the top level menu pop up, but cannot even move one item before the set powers off and starts booting again. Ahh, the fun of a !%%&@!# Linux OS on my TV. :( I am pretty convinced I need a (set of?) hard button(s) to press that will reset to factory without requiring any on screen menus, and it is very sad if such an elegantly designed, expensive device would not have this critical capability engineered in there somehow. I was hoping to find someone in FixYa who has experienced this exact issue on this era of Hitachi Plasmas given it clearly happens with some frequency, but if no one has and Hitachi has failed the critical design element of a hardware factory reset capability, I will cease my reposting and accept the information provided (Probably tomorrow).

  • bosbrucec Aug 06, 2008

    While all the responses so far were potentially helpful, there is no way to get to the factory reset on my 55HDT79 because the reboot cycle allows only for the top level menu to come up (<1 second actually booted enough to respond to the menu key). Seriously *bad* design, Hitachi, relying on a multi-stage button press and GUI in order to do a factory reset when software issues may prevent you from getting to said GUI (and so far no one has found any other way to factory reset the digital main boards). I will contact Hitachi support one more time in attempt to find this elusive "should-be-there" feature, then just buy a replacement board (still trying to find out if JP50761 or JA06715 from HDS69 will work in HDT79 model)...

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You can find your service manual at link below (may be usefull for DIY repairs)
http://www.manuals-in-pdf.com/42HDS69-p-1154744.html

Posted on Aug 06, 2008

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SERVICE MENU SETTINGS
All system, geometry and white balance alignments are performed in production service mode. Before
starting the production mode alignments, make sure that all manual adjustments are done correctly. To
start production mode alignments enter the MENU by pressing “M” button and then press the digits 4, 7,
2 and 5 respectively. The following menu appears on the screen
There are 3 submenu in service menu. These are display, calibration and deinterlacer menus. Press
“◄/►” buttons to select a menu title and then “▲/▼” buttons to select a menu item and “◄/►” or “OK
buttons to set the menu item to the desired option. To exit the service menu press “M” button.
Entire service menu parameters of Plasma TV are listed below.
13.1. display menu
By pressing “◄/►” buttons select the first icon. display menu appears on the screen
blank color
By pressing /. button, select blank color. Press ./. button to set the blank color. The options are:
black, red, green and blue.
panel
Displays panel resolution
power on time
Displays total working time of the set
backlight on time
Displays total backlight on time of the set.
calibration menu
By pressing “◄/►” buttons select the second icon. calibration menu appears on the screen.
color temp
By pressing /. button, select color temp. Press ./. button to set the color temperature. The
options are: 5500K, 6500K, 7500K, 9300K and user.
user color temp
factory reset
By pressing /. button, select factory reset. Press “OK” button to return to the factory setting values.

Posted on Jul 31, 2008

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  • 497 Answers

First, do a hard reset. Unplug the power cord for full 30 minutes. They power it up again.

Secondly, if the hard reset does not help, move the set around a little and smack it gently with your hand. Doing this will awaken any loose connections, cold solder joints or bad connectors inside the set.

Thirdly, check the cables and reinsert them to make sure they are providing good connections to the ports they are supposed to connect to.

If the above do not help, there is likely a problem with the display board or the power supply feeding that board. This repair must be done by a service tech who knows the set. If it is still covered under the factory warranty you should get them involved right away.
Thanks for using Fixya!

Posted on Jul 31, 2008

  • Yaz  S
    Yaz S Jul 31, 2008

    Press Menu Button, then in sequence 4, 7, 2 and 5

    You are now in the Service Menu

    Goto Options and press Factory Reset, it will only take a couple of seconds
    Press Escape, Standby and Unplug from Mains Leave for 5 mins and turn all on again

    If the problem persists I'm afraid you need to call Tech Support
    i hope this helps

    Thanks for using Fixya

  • Yaz  S
    Yaz S Jul 31, 2008

    plz do keep us updated sir!

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Hi try this links. click here

thanks!

Posted on Jul 31, 2008

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