Toshiba 27A34

# Toshiba 27A34 CRT RGB mod

The Toshiba 27A34 is a 27" curved CRT television released in the mid-2000s. Its curved screen provides excellent geometry and sharp picture quality. The television features component video inputs and allows users to check the number of hours the tube has been in use, provided the counter has not been reset. This model offers superior geometry and reduced distortion compared to flat-screen alternatives and is RGB modifiable.

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:

• Kaz Packmanopen in new window — contributor, RGB mod and pictures

# CRT safety

READ THIS BEFORE CONTINUING

# Plan of attack

READ THIS TO PREPARE

# Manuals and Datasheets

• Toshiba 27A34 Service Manualopen in new window

# Specs

• Manufactured: Thailand (2004)
• Chassis: M3N425
• Jungle Chip: Renesas M61283FP
• OSD Chip: Orion OEC7090A
• Screen Size: 27"
• Power: 125 W
• Inputs: RF, Component YPbPr, Composite, S-Video

# RGB mux diagram

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

# Performing the mod

# STEP 1: Remove the grounding resistors and capacitors

Remove the three 820Ω RGB resistors to ground

OSD grounding resistors R141, R142, and R143 should be removed. The inline capacitors C136, C137, and C138 should be removed and replaced with jumpers. I forgot to take a photo of the chassis for this step, but the diagram attached shows where the components are located on the chassis.

# STEP 2: Replace jumpers with capacitors and diodes, then connect RGB and blanking

Remove jumpers W107, W108, and W112 from the chassis and replace them with 1N4148 diodes and 0.1uF ceramic capacitors. Picture below illustrates the direction of these components as well as where the RGB lines should be connected. Pay attention to the direction of the diodes. The blanking wire (brown) should be connected to jumper W114.

# STEP 3: Connect sync, ground, and audio

Sync should be injected to the Component Luma (Y) input and audio goes to its respective audio lines. See the attached photo for the location which the wires should be connected to.

# STEP 4: Build your mux circuit

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

Buy your RGB mux board kit

# STEP 5: 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

# Muxed OSD over RGB

# Games

# Pictures

# Reference Photos

See more photos and contributions →open in new window