HDMI problem on RP JVC - sci.electronics.repair

Message from discussion HDMI problem on RP JVC

Franc Zabkar

More options Jul 27, 5:35 am

Newsgroups: sci.electronics.repair

From: Franc Zabkar <fzab...@iinternode.on.net>

Date: Sun, 27 Jul 2008 10:35:00 +1000

Subject: Re: HDMI problem on RP JVC

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On Fri, 25 Jul 2008 00:00:03 GMT, jordo <no...@email.address> put
finger to keyboard and composed:

>I have a JVC rear projection tv that I bought second hand a little over a
>year ago. It works fine except for the HDMI input. When I plug it into my
>cable box and switch to the digital input, it can't detect anything (and
>says it's gonna turn off in 9 minutes if nothing is connected before then
>:)). However, if I plug in my computer via a dvi/hdmi cable, the tv still
>doesn't detect a connection, but the computer recognizes the tv for the
>model number that it is.

To recognise the TV, the computer only needs to be able to read the
TV's EDID EEPROM via the DDC pins in the cable (pins 6,7,14,15):

http://pinouts.ru/VideoCables/hdmi_dvi_cable_pinout.shtml

I have managed to read a powered-down monitor's EDID EEPROM using my
device programmer. I made a VGA DB15-to-DIP8 adapter cable and told
the programmer that it was connected to an Atmel AT24C21 serial EEPROM
which has a "DDC1/ DDC2 Interface Compliant for Monitor
Identification".

You can find the EDID in the registry at the following key:

HKEY_LOCAL_MACHINE\Enum\MONITOR

If you export that key to a .reg file, you will see the EDID EEPROM
data. Analysing the EDID will tell you what scan rates the TV
supports. FWIW, if you post your EDID here, I may be able to analyse
the data for you.

BTW, if you want someone to help you, it would help them if you would
indicate the TV's model number.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

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