Sony (BA-4D) KV-20S90

# Sony (BA-4D) KV-20S90 CRT RGB mod

Below mod was performed on a Sony KV-20S90, by a reddit user /u/atomized69. You can follow similar instructions for other models listed below as well.

• KV-13M42
• KV-20M40
• KV-20M42
• KV-20S42
• KV-20S43
• KV-20S90

The Sony KV-20S90 is a 20" curved screen CRT television introduced in 2001. This is a more modern version than the popular KV-20S42. This CRT features side-mounted stereo speakers that provide clear, robust audio.

RGB modification for this CRT is very similar to other BA-4D based models.

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

# Table of Contents

# Contributors

Thank you to everyone who contributed to this guide:

• Andy Kingopen in new window — contributor, CRT specs from CRT Database.
• atomized69 — contributor, RGB mod
• Kcorleoneopen in new window — contributor, RGB mod pictures

# CRT safety

READ THIS BEFORE CONTINUING

# Plan of attack

READ THIS TO PREPARE

# Manuals and Datasheets

• Sony KV-20S90 Service Manualopen in new window
• Sony KV-20S90 User Manualopen in new window
• Sony CXA2061S Datasheet (Jungle)open in new window

# Specs

• Manufactured: Mexico (2001)
• Format: NTSC
• Chassis: BA-4D
• Tube: Sony Trinitron A51LDG51X
• Jungle Chip: Sony CXA2061S
• OSD Chip: Mitsubishi M37273MF-255SP
• Screen Size: 20"
• Inputs: Composite, RF

# Schematics

# RGB mux diagram

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

# Calculating the RGB external resistor value

Formula from our theory page!

Calcualted 910Ω for 0.7Vp-p. With didoe inline for RGB, you have to use 1kΩ

# Performing the mod

# STEP 1 to STEP 4: Removing resistors and injecting RGBs and blanking

Follow the KV-20S42 RGB mod guide.

# STEP 5: 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
• RGB MUX BOARD KIT 1.5Copen in new window

Buy your RGB mux board kit

# 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?

Depending on your CRT, you might need to find a good place to mount the SCART port.

Sony KV-20S90

# 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

Super Mario Kart

Demon's Crest

Zombies Ate My Neighbors

Closeup

# Patterns

Grid - KV-20S90

# Pictures

# Reference Photos

See more photos and contributions →open in new window