Sony KV (ANU-2) 27EXR20
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 
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.
Plan of attack
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.
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.
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.
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 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.
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 mod
| TV Model | KV-27EXR20 | KV-20EXR20 |
|---|---|---|
| Audio LR (R7, R8) | shorted | 1kΩ |
| RGB termination (R1, R2, R3) | 75Ω | 75Ω |
| RGB inline caps (R4, R5, R6) | 0.1uF | 0.1uF |
| Diode (R9) | Shorted | Shorted |
| Blanking Resistor (R11) | 1kΩ | 4.7kΩ |
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
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
