JVC AV-32D202

# JVC AV-32D202 D-Series CRT RGB mod

RGB Mod for JVC AC CRT televisions. Also applies to similar model numbers within the GC chassis.

This JVC D-Series chassis includes support for analog RGB through the micom's OSD video signals. You can tap in between the OSD's output and the Y/C Jungle's input to inject your external RGB signals through a common connector such as SCART or BNC. In this guide we will be utilizing SCART, made easier with help of Sunthar's mux board, more on that later.

This mux mod will utilize the OSD circuit for RGB, Component Luma for sync, and direct connection with SCART pin 16 for blanking.

Written by Brendan Eddy (FlyingFlygon)open in new window

# 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

# Service Manuals

• JVC AV-32D202/AV-32D302/AV-32D502 Schematics
• JVC AV-32D202/AV-32D302/AV-32D502 Service Manual

# Specs

• Manufactured: February 2002
• NTSC, 60 Hz, 128W
• Chassis:
• Tube: A80QCF240X14L, A80LJF30X08-G, M80JUA061X06
• Jungle Chip: TB1253AN (IC101)
• OSD Chip: MN1876478JL1 (IC701)

# Parts needed

• 4 x 1N4148 diodes
• 3 x 360 Ohm resistors
• 3 x 75 Ohm resistors
• 3 x 1k Ohm resistors
• 1 x 4.7k Ohm resistor
• 1 x SCART female port
• Plenty of different colored wire
• (Optional) Sunthar SCART mux board

# RGB mux diagram

# 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 grounding SMD resistors R793, R794, R795

• R793 (330 ohms)
• R794 (330 ohms)
• R795 (330 ohms)

Before removing the resistors

After removing the resistors

# STEP 2: Replace jumper wires with diodes

Replace OSD jumper wires with inline 1N4148 diodes. These wires are:

• W296 (blanking)
• W543 (blue)
• W302 (red)
• W301 (green)

Make sure the cathode end is towards the jungle as shown.

# STEP 3: Utilize the PIP header to expose RGB, Blanking and GND

At the end of these OSD lines they will connect through the unpopulated PIP connector CN003 and then enter 0 Ohm resistors before traveling to the jungle. These holes for the PIP header are convenient, as we can use them to bring the signals up to the top of the board. Standard header pins (for arduinos, etc) will fit but it's a tight squeeze. This is the route I chose. Optionally add header pins to the PIP pins 1-5. They are as follows:

• 1: ground
• 2: blanking (yellow wire > brown if you are using the ribbon cable)
• 3: blue
• 4: green
• 5: red

Finally, solder wires (or use quick connectors, but I avoid these due to interference/noise) to these on the top of the board, make sure they have enough length to reach the case where you will mount your external connectors (SCART, etc).

# STEP 4: Audio

Attach the rest of the wires necessary for your connector. If you're using SCART, you'll need wires for audio left and right. Regardless of SCART/BNC, you'll also need to attach a wire to the Component Luma pin for sync. Solder them at the pins like so. Make sure you use the component and audio jacks for Video 2. (I forgot to take a pic of my green wire - see the schematic for where it should go though).

Audio wires

All wired up!

# 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.

RGB mini Rev C mux board was used on this D-Series. The modification presented here does not utilize the benefits of the 10-pin DIN connector for convenient disconnection. However, it is strongly advisable to take this into account for your mod, as it would greatly enhance future serviceability.

# STEP 6: Attach the female SCART connector to TV

Creating a SCART cutout and mounting it is an art. There is a dedicated section for it. How to create and mount a SCART female plug?

Cut a hole in the back case for the SCART connector. Depending on if you're using a mux board, directly wired to SCART, or even using BNC or RCA, you should have plenty of options of locations. I chose above the input panel.

Insert a cut RCA jack into the Right audio channel in order to signal to the set to use stereo audio over SCART. If you omit this step, your audio will be mono. (Don't get confused at the fact my RCA is white. It's just what I had. Insert it into the red (Right audio) jack).

# Service Menu

• Press the SLEEP TIMER key and set the SLEEP TIMER for 0 MIN
• While the SLEEP TIMER is displaying on the CRT, do the below
• Immediately press the DISPLAY key and the VIDEO STATUS key of the remote control unit at the same time.
• Then enter the SERVICE MENU screen shown in figure.

# Pictures

# Mux overlay

RGB Overlay

# Games

# Patterns

240p pattern - Monoscope

240p pattern - Color bars

240p pattern - SMPTE