Sony KV (AA-2C) 32XBR48

# Sony AA-2C chassis CRT RGB mod

Below RGB mod was performed on a KV-32XBR48 by Kaz Packman.

This tutorial is also applicable for the below models:

• Sony KV-32XBR48
• Sony KV-35XBR48

# 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

# Sony KV-32XBR48

• Manufactured: September 1997, Mexico
• NTSC, 60 Hz - 195W
• Chassis: AA-2C
• Tube: M80JYV51X, Made in USA
• Jungle Chip: CXA2025AS (IC351)
• OSD Chip: CXP85856A-001S (IC001)

# Service manuals

• Sony KV-32XBR48 Service Manual

# Step 1: Remove the following components

• R1123
• R1128
• R133

# Step 2: Connect RGB and blanking wires

Inject R, G, B where the resistors were removed, but on the pad that is not connected to the ground.

# Step 3: Add a diode to blanking

Add this diode to reduce interference.

With diodes, direction matters. Please make sure to install it such that the stripe is pointing towards the chroma/jungle chip. The idea here is to make sure external blanking current doesn't reach the OSD chip.

# Step 4: Connect audio and sync wires

For this mod, the Video 1 S-Video input was used for Sync and audio injection. For the S-Video input to work for this purpose, a jumper wire was soldered between the two shield pads of the connector as seen in the picture.

Alternatively, you can inject Sync into the Video 4 Component Luma input and audio into its respective audio input pads if you wish to use that input for RGB instead. A dummy RCA plug was connected to the Right Audio input to preserve Stereo functionality when using RGB SCART.

# Step 4: Disconnect VM wires to reduce artificial sharpening

This set uses Velocity Modulation (VM), which can degrade the picture quality if not disconnected. It cannot be disabled in neither the user settings nor service menu, so it must be disconnected physically from the set.

You can do this in either one of two ways:

• Method 1: Permanently disconnect the 8-pin cable coming from CN941 on the WA board, which is the board on the CRT neck placed between the deflection yoke and the neckboard.

• Method 2: Remove the white wire from the 8-pin cable coming from CN941 on the WA board. To do this, unplug the cable from the WA board, place a pointed object in the catch on the plastic housing where the pin is located, pull out the wire from the connector housing while holding the pointed object in the catch to release it, then plug the cable back into the WA board without the white wire connected. It would be a good idea to isolate the metal crimp on the wire with Kapton tape to avoid shorting it out.

# Step 5: Build your mux circuit

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

It is important to note that the blanking ground resistor (R10) is necessary to prevent strange black backgrounds from appearing on the KV-27S22 OSD text.

Picture of RGB mux rev B 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?

# Pictures

# Games

Mux mod in action

# TV

Front