Question about Hitachi 55HDT79 55 in. Plasma HDTV
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.
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
By pressing /. button, select blank color. Press ./. button to set the blank color. The options are:
black, red, green and blue.
Displays panel resolution
power on time
Displays total working time of the set
backlight on time
Displays total backlight on time of the set.
By pressing “◄/►” buttons select the second icon. calibration menu appears on the screen.
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
By pressing /. button, select factory reset. Press “OK” button to return to the factory setting values.
Posted on Jul 31, 2008
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
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