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Re: Hitachi model 50V500 Pink picture

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>>Meat Plow wrote: >> >>> >>> >>> >>>>I have researched info on this probem, and found a fix, but I don't >>>>understand how it is done. Here is what the tech wrote - "Record 12C >>>>Buss settings, then "memory initi" and put back in the recorded data". >> >> >> >>> Appears that you record the 12C settings on paper, do a memory >>> initialize resetting everything then put back the 12C settings. I >>> would assume this could be done via a serviceman's menu mode. >> >> >> >>Do you all mean I2C? >> >>Michael > >No I mean 12C which is what the OP posted. Maybe it is I2C but I >wouldn't know the details unless I had hands on with the Hitachi sets >that use this method.

I'm replying to myself which is usually viewed as a sign of mental problems. However in this case it is to correct my error regarding I2C Bus Concept.. After leafing through a Panasonic PT51DX80A service manual I now recall it being a universal technology also used in the PT51DX80A. It simply replaces many mechanical adjustment controls with an OSD menu system.

So the fix is to wipe the I2C settings clean or reset them to factory specs then one by one compare the settings from what you had written down with what they now are and modify them if needed.

Reply to
Meat Plow
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That's OK. You fit right in with the other regulars. ;-)

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Reply to
Michael A. Terrell

I am wondering now when I initialize the memory (wipe 12C settings), does this affect every single adjustable parameter? I assume this sets all parameters to their factory (initial) data. We are talking about

20+ pages of parameters and data. Do I have to write all this down before I initialize? Looking at the service manual, there is a picture of what the 12C menu looks like. There are about 22 items listed, but only 8 have data listed. The others only have a blank box next to them, for example the "sub bright". But when I go down to the parameter list, the sub bright has an initial data of 80. Another example is the OSD. Blank box and no data on main menu, but 11 parameters on the list. It looks like the main menu items that have a blank box next to them all have many adjustable parameters in the parameter list. Sorry this is so long, but I'm trying to make this understandable. Should I have to worry about the million parameters not listed on the main menu before initializing?
Reply to
stokesbr

Also forgot to mention - It is the I2C, not the 12C.

Reply to
stokesbr

in

Solder (on back of crt connection board) a pot,,100k or so to at least

10M,, 1 connection to ground other to red gun,adjust pot,, measure R,replace pot w/resistor. WARNING HV,,use a plastic screwdriver to adjust pot ie:plastic spoon or knife sharpened to screwdriver point Joe
Reply to
joesmith

The reset would affect every setting you can access in the I2C service menu. If they are blank I wouldn't worry about them except to note they were blank. Some of those blank settings may rely upon other modes of operations to be apparent as in video settings for other resolutions like 480i/480p/720i/720p etc.....

Reply to
Meat Plow

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