Sony KV (BA-4) 27S45

# Sony KV-27S45 RGB mod

This largely follows the same method as the Sony BA-4D RGB mod article. Primary difference here is the use of micro mux board. Pictures were submitted by Brett Cutler.

Instructions below should also apply to these models:

• KV-27S40
• KV-27S45
• KV-27S65

# 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

• Sony KV-27S45 Service Manual

# Specs

# Sony KV-27S45

• Manufactured: November 1998, Mexico or January 1999, Mexico
• NTSC, 60 Hz - 140W
• Chassis: BA-4
• Tube: A68LML50X
• Jungle Chip: CXA2061S
• OSD Chip: M37273MF-255SP

# Mux diagram

If you are building your own circuit, this diagram should help. The diagram is for KV-27V40, it will also work for any other BA-4 chassis.

# 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. Taking out the chassis is fairly straight forward on this CRT. There are few wires that needs to be disconnected.

1. Degauss wire
2. Power wire
3. Ground wire attached to the neck board
4. Yoke deflection coil wire
5. Anode wire (this is the one with the rubber cap)
6. Left and right audio wires

Please remember that wires 1-5 are critical for the CRT to function and should not be omitted. Having any of these wires disconnected while powering up can damage the board and can have adverse effects.

# STEP 1: Remove the following components

Remove the following components. RGB resistors to the ground. Please always measure and mark them, so that you know you are removing the correct partrs.

• R087 (680Ω)
• R088 (680Ω)
• R089 (680Ω)

# STEP 2: Add RGB inline diodes (optional, but recommended)

To reduce interference, it is recommended to add these inline diodes. You will be lifting one side of the R025, R026, R027 and add diodes. Pay attention to the diode direction and how it was installed. This is extremely important. Otherwise, OSD will not work.

KV-27S45 - Heat shrink was used in the middle one to avoid shorts.

KV-27V40 - Heat shrink was used in the middle one to avoid shorts.

KV-27V42 - Heat shrink was used in the middle one to avoid shorts.

KV-27S42 - After adding diodes inline

# STEP 3: Solder R, G, B and blanking wires

# STEP 4: Solder audio, sync and ground wires

# STEP 5: Build your mux board

Below mod uses the micro 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

!Important. There is method to installing the micro board. Please follow this tutorial for the steps you should take to install the micro board.

# Pictures

# Games

# Set

Chassis

Yoke

Neck Board

Back label

Tube ()