TV RGB mod

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RogerB
Posts: 6
Joined: Thu Jun 24, 2021 1:28 am

TV RGB mod

Post by RogerB »

Hi, all I'm new here

I need help with an RGB mod that I want to perform in my CRT television that is the "SHARP 20KS100"

I've traced the R, G, B and Blanking signal from the IC201 jungle chip IX2933CE

R signal is coming from 15 pin
G signal is coming from 16 pin
B signal is coming from 17 pin
BLK signal is coming from 14 pin

to the IC2001 System Control Chip IX3088CEN2
R signal is coming from 18 pin
G signal is coming from 19 pin
B signal is coming from 20 pin
BLK signal is coming from 21 pin

Here is the schematics/service manual of the SHARP 20KS100:
https://diagramas.diagramasde.com/otros ... 0KS100.pdf

I really don't know what value of resistors I need to add neither where I need to add it to. Like this is the first RGB mod I ever attempted so yeah. I've done RGB mods on game consoles I'm not too familiar RGB modding CRT TV's. Bit a help I would deeply appeerciate. Thanks in advance
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Osirus
Posts: 214
Joined: Tue Jun 16, 2020 8:51 pm

Re: TV RGB mod

Post by Osirus »

Diagrams and charts for the common mod from MarkOZLAD:

https://klovimg.com/images/2018/07/17/O ... uit-v2.png
https://klovimg.com/images/2019/02/07/O ... -Table.jpg

Further discussion should be done in the dedicated thread: viewtopic.php?f=6&t=56155&start=3900
RogerB
Posts: 6
Joined: Thu Jun 24, 2021 1:28 am

Re: TV RGB mod

Post by RogerB »

Osirus wrote:Diagrams and charts for the common mod from MarkOZLAD:

https://klovimg.com/images/2018/07/17/O ... uit-v2.png
https://klovimg.com/images/2019/02/07/O ... -Table.jpg

Further discussion should be done in the dedicated thread: viewtopic.php?f=6&t=56155&start=3900

I discovered that I have a 6.8 kilo ohm resistor from the section of the microcontroller and 1.8 kilo ohm resistor from the OSD inline. I'm kind of confused on how do I calculate the resistor value I need to add in OSD RGB input section of the board. Because I saw the post from MarkOZLAD I read everything but I don't understand how he ended up with a 75 ohm resistor value.(I've seen Like all I know is that he aim for 0.71 volts output. Does mines have to like match the same voltage? (I'm sorry for the ignorance rgb modding television, I'm not too familiar these type of stuff). Because I used the chart you posted in here of the OSD-Mux-RGB External-Inline-Resistor-Table and I look at the 1,800 ohm resistor value since mines is 1,800 ohm resistor and I saw in the no diode on OSD section "calculated" that the resistor value should be 218 and the Next Standard size should be 220. So I assume that I need either a 218 ohm resistor or 220 ohm resistor. I'm just very confused because his ohm resistor he added was 75 ohms and he only had 820 ohm resistor so according to that same chart it should be calculate 58 ohm resistor or the Next Standard Size 62 ohm resistor. I want to just make sure I'm right or wrong. Also why is there 0.7Vp-p and 0.5Vp-p chart? Which one should I use for mines? Thanks in advanced

Update: also it doesn't add up the resistor value of the chart that I will place to get 0.7 volts. I put on the calculator the 220 ohm resistor and instead I get 1.14 Volts.
RogerB
Posts: 6
Joined: Thu Jun 24, 2021 1:28 am

Re: TV RGB mod

Post by RogerB »

Osirus wrote:Diagrams and charts for the common mod from MarkOZLAD:

https://klovimg.com/images/2018/07/17/O ... uit-v2.png
https://klovimg.com/images/2019/02/07/O ... -Table.jpg

Further discussion should be done in the dedicated thread: viewtopic.php?f=6&t=56155&start=3900
Update: I figure out that the resistors going to OSD input is surface mount. I have no idea if the same method theirs would work still in my tv set. I already did the calculation. It would require 1.1k ohm resistor and 75 ohm resistor to get 0.73 volts.
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