# Sharp CJ13M10 CRT RGB mod

This tutorial covers the RGB mod for Sharp CJ13M10. These instructions should also work for

  • Sharp CL13M10
  • Sharp 20KS100

This CRT TV is definitely worth RGB modding because it only comes with one composite input in the front and an RF input at the back. RGB modding this CRT is fairly straightforward.

This mod doesn't work on the below Sharp CRTs. The below newer version of the CRTs use IX3354CE, which uses digital RGB. Therefore, they can't be modded.

  • Sharp CN13M10B/CN13M10 (2000 and later)

# CRT safety

DANGER

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.

READ THIS BEFORE CONTINUING

# Plan of attack

READ THIS TO PREPARE

# Theory

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.

READ THE RGB MODDING THEORY

# Specs

# Sharp CJ13M10

  • Manufactured:
  • NTSC, 60 Hz
  • Chassis:
  • Tube: CPJ370BVBK1S

# Sharp

  • Manufactured:
  • NTSC, 60 Hz
  • Chassis:
  • Tube: 37GDA86X

# Service manuals

I couldn't find the service manual for this TV.

The below service manual has equivalent circuit.

Sharp CL13M10 Service Manual Sharp 20KS100 Service Manual

# Schematics

IX2933CE Chroma Chip

img

# Mux diagram

If you are building your own circuit, this diagram should help

img

# Calculating the RGB external resistor value

Love it when we can put theories to use! Formula from our theory page!

img

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 (1.8 kΩ)
  • R804 (1.8 kΩ)
  • R805 (1.8 kΩ)

# STEP 2: Connect RGBs, Blanking and Audio

Close up of RGB and Blanking img

Close up of Sync and Audio img

All wired up! img

# 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.

Buy your RGB mux board

TV Model CJ13M10
Audio LR 1kΩ
RGB termination 75Ω
RGB inline resistors 1kΩ
Diode 1N4148

img

Buy your RGB mux board

# STEP 4: Attach the female SCART connector to TV

img

Creating a SCART cutout and mounting it is an art. I have a dedicated section for it.

How to create and mount a SCART female plug?

# Remote Control for this TV

img

# Getting into service menu

While pressing the Vol-up and Ch-up buttons at the sametime, plug the AC cord into a wall socket.

# Pictures of the mod

# Games

NES Adventure Island img

NES Adventure Island Close up img

SNES Contra Alien Wars img

Game menu overlay (mux in action) img

Genesis 2 Sonic The Hedgehog img

XBOX Unleash X menu img

# Patterns

Text from FXPAK Pro img

Grid img

SMPTE Color Bars img

# Neck board ground wire mod

The ground wire from the tube is soldered to the neck board, which makes it difficult to remove the board entirely from the CRT. While, this may not be necessary for this RGB mod, it definitely makes it easy to connect/disconnect the ground wire attached to the tube. I found the cable and the pin from another CRT that was going to be recycled.

Neck board back img

Neck board pin soldered img

Tube new wire soldered img

Neck board ground attached img

# Service menu settings

# CJ13M10

NUM SETTING VALUE FIXED
S01 PICTURE 60 DEFAULT
S02 TINT 3D DEFAULT
S03 COLOR 33 DEFAULT
S04 BRIGHTNESS 56 DEFAULT
S05 SHARPNESS 24 DEFAULT
S06 VERTICAL PHASE 06 DEFAULT
S07 HORIZONTAL PHASE 17 DEFAULT
S08 RF-AGC 26 DEFAULT
S09 VCO 12 DEFAULT
S10 VERTICAL AMP 26 DEFAULT
S11 R CUT-OFF 09 00
S12 G CUT -OFF 00 DEFAULT
S13 B CUT-OFF 24 DEFAULT
S14 G GAIN 9F DEFAULT
S15 B GAIN 84 DEFAULT
S16 TRAP 00 DEFAULT
S17 BALANCE 20 DEFAULT
S18 C.C.POSITION 1C DEFAULT
S19 Y-MUTE 00 DEFAULT