Well this is interesting!
I was trying to adjust my deflection coils to correct the tilt (set orientation didn't fix it, I've tried it facing all polar directions - degaussing cycles didn't help either) but they don't seem to budge, even after releasing the clamp. Possibly bonded with glue to the CRT neck. When all of a sudden my picture goes BLANK.
Immediately I begin to freak out, thinking somehow I broke my set. After some reading and checking around I discovered the awesome
little feature they put on the HDMI board for this set (and for sure, many others). The optical sensor which locks the HDMI board if it detects a light source. I was using a flashlight at the time...
Now I've gone and done the song 'n dance routine trying to reset the thing but I still can't get it to work. Here's where I am at:
With factory remote set to TV and VCR...
Set SLEEP TIMER to 30 MIN
With SLEEP TIMER still on OSD - on remote press DISPLAY and VIDEO STATUS
This will bring up the test mode screen with the onboard diagnostics: SELF-CHK. Press 4 on the remote to perform self-test.
There are two possible states for a system on this set, OK and NG (abnormal.) My set displays NG9 for HDMI. The onboard diagnostic EEPROM can store upto 9 errors per device.
Now according to the service manual, pulling the power from the wall at this screen will SAVE any errors and powering down with the POWER button on the remote will erase all the errors. One source I've read states that erasing the errors will reset the HDMI board.
OK, method 2:
From the service manual:
(wish I would have paid more attention to this before-hand!)
What I read says to power down without fault (using power button) then unplug the set. Short pins 1 and 2 with a jumper then plug in and power on the set. The HDMI source should be on at this time, hooked up to the set and should display the image. Unplug the set immediately and remove the jumper. Set should function as normal now.
My next try will be to go through the HDMI options in the service menu.. they're all unlabled and the service manual says not to change any values. But also includes the default values. Maybe the intrusion sensor changed a hard value which can be set back..
Also worth noting, very interesting... it seems that this HDMI board is nothing more than a HDMI to YPbPr converter. The outputs tie right into the component video chip. Furthermore I discovered this while scanning the schematics:
Seems to be a D-SUB 15-pin connector which is not even on the board/chassis. Looks a heck of a lot like VGA to me:
I wonder if the "chip" can accept the RGB input or even accept the 31.47kHz H.Sync frequency and reproduce an image worth using. If so I might just ditch this HDMI business altogether.
I used method 2 with a little modification.
- Power down without fault via power button on set
- Unplug HDMI source
- Unplug AC power
- Jump pin 1-2 on HDMI board
- Plug in AC power
- Power on via power button on set
- Unplug AC power WHILE ON
- Remove jumper
- Plug in AC and HDMI source.
- Power on.
- Viola! Picture again.