Sharp CJ13M10/20KS100

# 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

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

# Mux diagram

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

Optional

• Replace 0.1uF, 50V electrolytic capacitors with 0.1uF, 50V ceramic capacitors
• Add a diode inline for the blanking circuitry and replace the 6.8kΩ resistor with a 4.7kΩ resistor.

# STEP 2: Connect RGBs, Blanking and Audio

Close up of RGB and Blanking

Close up of Sync and Audio

All wired up!

Another picture from a different set

# STEP 3: Ceramic inline caps (optional)

I would recommend changing the inline RGB caps to 0.1uF ceramic capacitors.

# STEP 4: Add diode to the blanking

On the CRT chassis change R2027 from 6.8k to 4.7k along with a 1N4148 diode.

This is recommended to reduce interference. See the mux diagram above and the picture circled below.

Diode stripe should be pointing in the correct direction.

# STEP 5: 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

Buy your RGB mux board

# STEP 6: Attach the female SCART connector to TV

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?

Route the ribbon cables carefully, not touching the heat sinks or high voltage.

# 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.

# Pictures of the mod

# Games

NES Adventure Island

NES Adventure Island Close up

SNES Contra Alien Wars

Game menu overlay (mux in action)

Genesis 2 Sonic The Hedgehog

XBOX Unleash X menu

# Patterns

Text from FXPAK Pro

Grid

SMPTE Color Bars

# 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

Neck board pin soldered

Tube new wire soldered

Neck board ground attached

# Pictures of the set

Back label

# Swapped tube

Originally this late 90s set came with the following tube: CPJ370BVBK1S

However, it can be replaced with the newer tube: 37GDA86X. It works without any issues.

# Service menu settings

# CJ13M10

TV1

TV2