Sony KV (BA-4D) 27S42 YPbPr

# Sony KV-27S42 YPbPr Component mod

If you're looking to get the most out of your Sony KV-27S42 Trinitron, you may want to consider modding it for RGB and component output. This guide will show you how to do just that.

Shmups Referenceopen in new window

Sony BA-4D RGB Mod

Instructions below should also apply to these models:

• KV-13M42
• KV-20M42
• KV-20S42
• KV-20S43
• KV-20S90
• KV-27S42
• KV-27V42
• KV-27S46
• KV-27S66
• KV-35S36

# 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-27S42 Service Manual

# Specs

# Sony KV-27S42

• Manufactured: September 1999, Mexico
• NTSC, 60 Hz - 90W
• Chassis: BA-4D
• Tube: A68LML50X
• Jungle Chip: CXA2133S/CXA2133BS
• OSD Chip: M37273MF-255SP

# Schematics

# YPbPr component mod diagram

# Performing the component mod

This mod is farily straightforward. Except there are few points to keep in mind.

# STEP 1: Remove components and add capacitors

Remove 0.01uF caps C380, C381, C382 and populate C371, C372 and C373 with 0.01uF caps. It's convenient to just move these ground capacitors over to the empty spots.

Attach 5V to the No Connect(NC) pad through 1kΩ resistor

YPbPr, Blanking and Ground connections

# STEP 2: Switch for component blanking

Drill holes and attach the YPbPr connectors and add a switch for blanking. I didn't have a SPST switch, so ended up using something fancy.

SCART and YPbPr Component can easily co-exist on this CRT

# STEP 3: Adding 75 ohm termination

Add 75Ω termination resistors to Blue and Red connectors.

Connect Green with S-Video's Luma pin. Make sure grounding wires are all connected properly

# Finished mod

Audio for YPbPr component goes through the standard Left and Right Audio along with Video 1 input.

Below picture is a bit blurry, but you get the idea

# Reducing interference

Sometimes you might notice micro interference in the video signals. This is expected. To reduce it, try the following.

• Use diodes in-line for RGB signal
• Make sure your blanking wire is connected after the diode that feeds into the chroma chip (see diagram)
• Try routing most of the cabling below the PCB
• Keep the ribbon cable short
• I really didn't find any difference in interference in using shielded vs non-shileded cables. Therefore, this is optional.

# Getting into the service menu

• Turn the set on and then put into standby
• Press the Display, 5, VOL + buttons in sequence
• Turn on the CRT and you should be in service mode
• Use buttons "1" and "4" on the remote control to navigate the service menu
• Use buttons "3" and "6" to adjust the selected data

# Pictures of the mod

# Games (KV-27S42) - Component

Wii - Just Dance

Wii - Rayman Origins

Wii - Call of Duty