TV RGB mod thread

[doofy77]

So, I attempted to mod my LG CA-21D33EX today, and was mostly successful, but the OSD Menu is now really dark.




The OSD menu isn't completely black, just very dark and faint


The AV2 is basically black


This set has the MC-84A chassis. I followed the guide here: viewtopic.php?t=60010. I Installed the missing resistor at R557 with 510R, I also had a missing resistor at R234 75R which i installed as well. Instead of bridging J99, I installed a switch so I could switch back and forth between CVBS and RGB. I managed to change the required settings in the service menu but it was pretty difficult to see.



Everything seems to work fine. I can switch between composite and RGB no problem but the OSD menu is almost unreadable.
It isn't just on the AV1 input though, it's on the tuner and on AV2.

Does anyone know what the issue could be?

It looks like the OSD is muxed after the jungle chip.


I checked around the board for any missing components related to the OSD and found that C17 wasn't there. Should I put one there? Should it be the same value as C14, C15, and C16?

[MarkOZLAD]

The jungle chip in this set requires 1-3V for RGB blanking but also has a mode when the blanking goes over 4V where the jungle RGB out is muted for osd overlay. (Due to the post mixed OSD)

Seems likely that you’ve somehow mucked up the blanking circuit such that the OSD blanking is no longer able to go above the 4V, though I cannot be sure.

These are generally about the easiest mod you can ever do so hard to pick what you’ve done wrong. The first thing I can think to do is to check the resistance between pin 16 of scart and ground. Should be 75 ohm.

[Trick-E]

So I'm in the middle of an RGB mod on a JVC C-1327 with the Toshiba TA8601AN Jungle IC, but have yet to see good results.
Has anyone successfully completed a working RGB mod on one of the JVC C series?

I have the chassis schematics, but only the datasheet for the TA8601BN, which is likely similar but not identical.

I've tapped into the RGB output of the Jungle chip (at the resistors just afterwards), and grabbed the Sync and Blanking directly from the chip pins, but don't have a clear signal.

Looks like sync isn't working, and while the screen goes black once I input an RGB signal, this happens whether or not the voltage goes to the blanking, and my input signal is barely visible.

Any help would be appreciated. I can add any necessary pics to clarify this post.

Trick

[ahkek89]

Panasonic TC21S10R with MX-3 chassis

The mod consists of only 3 capacitors, a switch, scart sockets and some cables.
The picture is perfect!
The only drawback is that the service menu does not allow to move the picture a little more to the right, but it is not a problem.
When the OSD is needed, it is turned on by the switch - the green color changes a little, but only for a moment while settings are made.

Is the brightness consistent across different consoles?

[tikao]

Emerson HKTV13 / Hello Kitty TV RGB Mod Update

Just want to give an update on the HKTV13 I was working on. It was a lot of work but I was able to successfully add RGB and find a proper solution around the dual OSD / Switch buffer circuit. I had to isolate them entirely and create my own circuit board with a switching component that 2:1 from the external RGB and the original composite / OSD circuit. I also ended up needing to add an RGB amplifier for the external RGB to give it enough boost to work properly into the jungle chip. It looks pretty damn good and the levels seem spot on so far.



I may release the circuit in the future after I am finished with it. Overall it is pretty non destructive as sort of an interposer board using the wiring harness to inject the signals. I did replace the harness with modern JST connectors to make it more compatible. Next up will be drilling out the holes in the shell for the RCA jacks and switch.

I tried to do the RGB MOD here too and ran into the same problems you imagined. Luckily, I found your posts here and would like to know if you could share the solution you developed.
I've tried several solutions and haven't been able to get a good result.
I'd appreciate it if you could help.

[crowmacnas]

Has anyone tested whether the TA8801AN chip accepts analog OSD or just a digital signal?

Not sure if this is related, but I also have a Toshiba Jungle IC I've been trying to find info on for a RGB mod on a Sony KV20VM30 TV/VCR Combo.
The goal is to add a SCART RGB input.

I know it's been over a year since you posted this, lowonammo, but I'm also working on a TA8825AN chip in a KV20VM30. I think I've about determined that it does not take an analog RGB input but I'd like to hear any updates you have. Did your experiments turn up anything promising?