Sharp 36J-S400 CRT RGB mod
This tutorial covers the RGB mod for Sharp 36J-S400. These instructions should also work for
You can die doing this! So read carefully! CRT TV is not a toy. Do not open a CRT TV. If you don't have any prior knowledge about handling high voltage devices, this guide is not for you. CRT TV contains high enough voltage (20,000+ V) and current to be deadly, even when it is turned off.
Plan of attack
Sometimes it is nice to know the theory behind the mod. I have put this on a separate page. This shows how the various resistor values are calculated.
I couldn't find the service manual for this TV.
The below service manual has equivalent circuit.
IX2573CE Chroma Chip
If you are building your own circuit, this diagram should help
Calculating the RGB external resistor value
Love it when we can put theories to use! Formula from our theory page!
RGB external resistor value = 0.7 x (6800 + 75) - (75 x 5) / (5 - 0.7) = (4812 - 375) / 4.3 = 1030 ohm
~ 1 Kohm resistors should do the job.
Performing the mod
Now that you roughly know what needs to be done, prepare for the mod. Place the board on a comfortable place. Make sure you are not putting pressure on the flyback or other components.
STEP 1: Remove the following components
Remove the following components. RGB resistors to the ground. Measure twice and mark before you remove.
- R803 (2.2 kΩ)
- R804 (2.2 kΩ)
- R805 (2.2 kΩ)
STEP 2: Connect RGBs, Blanking and Audio
RGB and Blanking
Sync and Audio
STEP 3: Build your mux board
Below mod uses the RGB mux board. This is optional, but will make your mod easier and stable. You can also create the circuit presented in the schematics above without the board. Please also checkout the precalculated resistor values.
|RGB inline resistors||1kΩ|
STEP 4: Attach the female SCART connector to TV
Creating a SCART cutout and mounting it is an art. I have a dedicated section for it.
Remote Control for this TV
Getting into service menu
While pressing the Vol-up and Ch-up buttons at the sametime, plug the AC cord into a wall socket.