JVC C-13810

# JVC C-13810 CRT RGB mod

The JVC C-13810 is a 13" CRT television featuring a full-square tinted picture tube, designed for, compact, and budget-friendly, with mono sound, front/rear RCA inputs, and a, headphone jack.

This set is RGB modifiable for sharper picture.

View full CRT details and more mod examples →open in new window

This tutorial covers the RGB mod for JVC C-13810. Looking through the service manuals these instructions should also work for other JVC models (AV-13810 / AV-20810 etc.)

This tutorial should also work for

• JVC C-13810
• JVC C-13811
• JVC AV-13810
• JVC AV-20810
• JVC AV-20811

# Contributors

Thank you to everyone who contributed to this guide:

• Suntharopen in new window — author, RGB mod and pictures

# CRT safety

READ THIS BEFORE CONTINUING

# Plan of attack

READ THIS TO PREPARE

# Manuals and Datasheets

• JVC C-20810 SMopen in new window
• Toshiba TA1242N Datasheet (Jungle)open in new window
• Mitsubishi M37267M8 Datasheet (OSD)open in new window

# Specs

• Year: 1997
• Jungle Chip: Toshiba TA1242N
• OSD Chip: Mitsubishi M37267M8

# Schematics

I followed the specs from JVC C-20810. The chips used in C-13810 were the same. Resistor values might be different. Measure what's on your chassis.

# RGB mux diagram

Prepare the mux diagram. If you are building your own circuit, this diagram should help.

# Calculating the RGB external resistor value

From the M37267M4 (OSD) chip datasheet we know the RGB high voltage is 2.4V.

Let's now calculate the peak-to-peak voltage on the RGB lines that is sent to the chroma chip.

Now that we know the expected peak-to-peak voltage by TA1242N (chroma) chip is 0.5V, let's calculate the RGB resistor value needed.

0.5 x (3900 + 75) - (75 x 2.4) / (2.4 - 0.5) = (1987.5 - 180) / 1.9 = 950Ω

# 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.

• R738 (1 kohm)
• R740 (1 kohm)
• R742 (1 kohm)

# STEP 2: Connect RGBs, Blanking and Audio

This TV doesn't have a schematic to show this on a diagram. But, the picture below shows where the wires should be soldered. This TV was pretty nice as there were holes on the PCB through which I was able to route the wires.

Route the wires through the hole

# STEP 3: Build your mux board

This 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 mux calculatoropen in new window to play with your own values.

Compatible mux boards: RGB MUX BOARD KIT 1.4Copen in new window, RGB MUX BOARD KIT 1.4Bopen in new window

Buy your RGB mux board kit

# 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.

How to create and mount a SCART female plug?

# Remote control and service menu

You need the JVC branded remote to get into the service menu. Pressing both the "Video Status" + "Display" buttons together on the remote brings up the service menu.

You will need to adjust the Horizontal Position slightly with the RGB input.

• JVC RM-C540
• JVC RM-C542

# Pictures of the mod

# RGB mux board mounted

# Full board

# Chroma chip

# Neck board

# Switching isolation power supply

# Patterns

# Convergence

# Grid

# Color Bars

# Super Mario

# SCART Connector

# JVC Back and SCART connector position

# SCART connector

# Position of the SCART cable should be taken into consideration

# Pictures

# Reference Photos

View full-size imageopen in new window

View full-size imageopen in new window

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View full-size imageopen in new window

See more photos and contributions →open in new window