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Sony KV (ANU-2) 27EXR20

Kaz PackmanAbout 3 minCRT RGB modKV-20EXR10KV-20EXR15KV-20EXR20KV-27EXR10KV-27EXR15KV-27EXR20KV-27EXR25

Sony ANU-2 chassis RGB mod

Bring your Sony CRT to life with vibrant RGB colors!

This RGB mod applies to the following models. Other ANU-2 chassis can also utilize the same mod.

  • KV-20EXR10
  • KV-20EXR15
  • KV-20EXR20
  • KV-27EXR10
  • KV-27EXR15*
  • KV-27EXR20
  • KV-27EXR25*

*The P-Board for Picture-in-Picture functionality must be removed in these models.

Sony KV-27EXR20 Sony KV-27EXR20

CRT safety

Caution

You can die doing this! So read carefully! CRT TV is not a toy. Do not open a CRT TV. If you don't have any prior knowledge about handling high voltage devices, this guide is not for you. CRT TV contains high enough voltage (20,000+ V) and current to be deadly, even when it is turned off.

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

Specs

Sony KV-27EXR20

  • Manufactured: March 1992, Mexico
  • NTSC, 60 Hz
  • Chassis: ANU-2
  • Tube: Sony Trinitron A68JMT50X
  • Jungle Chip: CXA1313AS

Sony KV-20EXR20

  • Manufactured: February 1992, Mexico
  • NTSC, 60 Hz
  • Chassis: ANU-2
  • Tube: Sony Trinitron A51JUH50X
  • Jungle Chip: CXA1313AS
  • OSD Chip: M37100M8-115SP

Schematics

SCART schematics

The RGB mod

Please note below mod uses an external switch for the 5V.

STEP 1: Add a male DuPont connector for RGB

Unlike the 20" counterpart, the KV-20EXR20, the A-31 header and the four 100 ohm resistors that come between it and the jungle chip were already populated. However, the A-31 connector had to be removed and replaced with a male DuPont because the connector's pins were too short to securely seat a DuPont cable.

Sony KV-27EXR20

Populate the A-31 header with a 5-pin male DuPont header connector in the pins labeled "B IN", "G IN", "R IN", "E", and "YS".

STEP 2: RGB wires for female DuPont connector

Five of the wires from the Mux board IDC cable (Blue, Green, Red, Orange, and Brown) were crimped to a female DuPont connector for connection to the header on the TV chassis.

Sony KV-27EXR20

NOTE

In the new PCB design Orange and Purple wires were reserved as optional and not connected to ground. On the board side, you will need to short them to ground.

Sony KV-27EXR20

STEP 3: Sync and Audio wires

The black ground wire was connected to the S-Video sensing circuit on the U2 board to allow the use of S-Video Luma as a Sync input.

Sony KV-27EXR20

NOTE

In the new PCB design Orange and Purple wires were reserved as optional and not connected to ground. On the board side, you will need to short them to ground.

STEP 4: RGB mux board

Below mod uses the RGB mux board. Using the mux board makes the mod neater and easier. Please note for this mod, 0.1uF caps were used in place of R4, R5, R6 resistors.

Buy your RGB mux board with the necessary parts to complete this modopen in new window

TV ModelKV-27EXR20KV-20EXR20
Audio LR (R7, R8)shorted1kΩ
RGB termination (R1, R2, R3)75Ω75Ω
RGB inline caps (R4, R5, R6)0.1uF0.1uF
Diode (R9)ShortedShorted
Blanking Resistor (R11)1kΩ4.7kΩ

Sony KV-27EXR20 RGB mux board

STEP 5: Service Menu Adjustments

SERVICE MENU

To access the service menu, insert the end of a bent paper clip into a tiny hole on the AV input jack panel and power the set on while holding the paper clip into the button inside the hole for about 10 seconds.

Go into the service menu and adjust the horizontal position (labeled "HPOS" in the service menu) until it looks properly centered. If you're inputting sync into the S-Video input, you should only have to adjust it by about 2 or 3 subtracted from the original value.

STEP 6: Attach the female SCART connector to TV

Sony KV-27EXR20 RGB mux board

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 of the mod

Games

Sony KV-27EXR20 RGB mux board

Sony KV-27EXR20 RGB mux board

Sony KV-27EXR20 RGB mux board

Sony KV-27EXR20 RGB mux board

Sony KV-27EXR20 RGB mux board

Sony KV-27EXR20 RGB mux board

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