Sony KV (AA-1)
Sony AA-1 chassis RGB mod
Bring your Sony CRT to life with vibrant RGB colors!
This RGB mod applies to the following models. Other AA-1 chassis can also utilize the same mod.
- Sony KV-27V10
- Sony KV-20V50
- Sony KV-27V55
- Sony KV-32S12
- Sony KV-32S16
- Sony KV-27S10
- Sony KV-27S15
- Sony KV-32S10
- Sony KV-32S15
- Sony KV-27TS29
- Sony KV-27TS32
- Sony KV-27TS36
Sony KV-27V10 
Sony KV-27V55 
Sony KV-27TS36 
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
- Sony KV-27S10 Service Manual
- Sony KV-27V10 Service Manual
- Sony KV-27V55 Service Manual
- Sony KV-27V55 Service Manual - Variant 2
- Sony KV-27TS29/KV-27TS32/KV-27TS36 Service Manual
- Sony KV-27TS29 Service Manual - Variant 2
Specs
Sony KV-27V10
- Manufactured: March 1994. San Diego, CA
- NTSC, 60 Hz, 165W
- Chassis: AA-1
- Tube: A68KZJ50X (same tube is used on AA-2D)
- Chroma Chip: CXA1465AS (M-Board) - IC101
- Closed Caption Decoder (CCD) Chip: Zilog SL1635 (M-Board) - IC150
Sony KV-27V55
- Manufactured: March 1994. San Diego, CA
- NTSC, 60 Hz, 210W
- Chassis: AA-1
- Tube: A68KZJ50X (same tube is used on AA-2D)
- Chroma Chip: CXA1465AS (M-Board) - IC101
- Closed Caption Decoder (CCD) Chip: Zilog SL1635 (M-Board) - IC150
Sony KV-27TS36
- Manufactured: August 1993, Mexico
- NTSC, 60 Hz
- Chassis: AA-1
- Tube: A68KZJ50X
- Jungle Chip: CXA1465AS
Schematics
Really simple RGB mod is possible on this chassis. We will be disabling Closed Caption Decoder (CCD) and leveraging the analog RGB inputs used to feed our external RGB signal.
Let's review the block diagram and schematics first.
Chroma CXA1465AS - Block Diagram 
If you look at the block diagram, analog R, G, B inputs at pins 16, 17, 18 are what we are going to be harnessing.
Chroma CXA1465AS - Schematics 
The above schematics shows the R, G, B, Blanking signal going from the CCD chip to the CXA1465AS chip. Pink circle shows the caps C315, C316 and C317 that we will be removing.
The RGB mod
You only need to touch two boards on this CRT to do the RGB mod. (1) U(A) board. (2) M board.
No need to remove anything else or mess with the anode cup etc. for the RGB mod. This makes it AA-1 one of the simplest chassis to RGB mod. However, disassembling and getting to these boards can be somewhat of a pain.
STEP 1: Attach RGB wires
At the time of this writing there were no successful AA-1 RGB mods that were posted. Instead of removing the CCD chip or messing around with the SMD resistors, let's remove the 10uF 50V electrolytic caps. Removing the electrolytic caps will disconnect the CCD RGB input to the chroma chip. We will then inject our RGB signals directly through 3x 0.1uF ceramic caps to the chroma chip. We will be attaching the R, G, B wires to the +ve terminals of C317, C316 and C315 respectively.
Left: Caps to remove on M board, Right: Attach RGB wires to the +ve vias 
Removed caps. Oddly satisfying to see them removed.! 
STEP 2: Attach blanking wire
Important! Remove the R165 SMD resistor. This should effectively disconnect the blanking signal going to the chroma chip. The value of this resistor should be 4.7k.
Connect blanking wire, just before the SMD diode D004. Attaching the blanking wire to the R165 pad away from the CCD chip should also work. This is what was done in this mod.
You can also attach the wire to the diode leg. Make sure to pay attention to where you solder the external 5V blanking wire (brown wire). Making a mistake here can potentially fry components on the M board.
Mount the M board back on the main chassis. Make sure all wires are connected correctly.
STEP 3: Attach audio and sync wires
On the UA board, connect Audio, ground and sync wires as seen in the below picture 
STEP 4: Make your SCART connector circuit
Below mod uses the RGB mux board. However, it is optional for AA-1 chassis. 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-27V10 |
|---|---|
| Audio LR (R7, R8) | 1kΩ |
| RGB termination (R1, R2, R3) | 75Ω |
| RGB inline caps (R4, R5, R6) | 0.1uF |
| Diode (R9) | Shorted |
| Blanking Resistor (R11) | 4.7kΩ |
Radial 0.1uF, 50V ceramic caps were used inline instead of resistors.
Picture of the mini Rev B board 
Buy your RGB mux board with the necessary parts to complete this mod
Mouting the SCART adapter to the back is a bit tricky, but not difficult if carefully planned. 
Inside 
Outside 
Perfectly fits with the U(A) board 
Snug fit once closed 
SCART port finished 
Connector plugged in 
Full back view with SCART port 
Pictures (Sony KV-27V10)
OSD
OSD overlay above Megaman X 
OSD overlay above SMPTE 
Patterns
SNES 240p Grid 
SNES 240p SMPTE 
Games
NES - Adventure Island 
SNES - Mega Man X 
SNES - Super Mario World 
SNES - Super Mario World 
SNES - Super Mario World 
Sega Genesis - Sonic 
SNES - Super Metroid 
PS1 - Boot 
PS1 - Boot 
XBOX - UnleashX 
Pictures of the CRT
M Board (before the mod) 
CRT back open (after the mod) 
Service Menu Values (Sony KV-27V10)
NOTE
On KV-27TS36, "ID-2" was changed from 72 to 8 to disable Closed Captioning after the mod was performed, as the Closed Captioning decoder had to be disconnected from the jungle chip RGB and blanking lines as part of the mod.
| NUM | SETTING | VALUE | FIXED |
|---|---|---|---|
| 00 | AFC | 0 | DEFAULT |
| 01 | HFRE | ||
| 02 | H VCO | 3 | DEFAULT |
| 03 | H PHASE | 13 | |
| 04 | AFC GAIN | 6 | DEFAULT |
| 05 | V SHIFT | 2 | DEFAULT |
| 06 | H.SIZE | 24 | |
| 07 | V.SIZE | 31 | |
| 08 | V.LIN | 20 | |
| 09 | VS.CORR | 38 | DEFAULT |
| 10 | R.DRV | 71 | |
| 11 | B.DRV | 71 | |
| 12 | R.BIAS | 142 | |
| 13 | G.BIAS | 142 | |
| 14 | B.BIAS | 142 | |
| 15 | BRI.MAX | 150 | DEFAULT |
| 16 | BRI.CENT | 83 | |
| 17 | BRI.MIN | 50 | DEFAULT |
| 18 | CONT.MAX | 87 | |
| 19 | CONT.CENT | 64 | DEFAULT |
| 20 | CONT.MIN | 16 | DEFAULT |
| 21 | COL.MAX | 90 | DEFAULT |
| 22 | COL.CENT | 65 | |
| 23 | COL.MIN | 00 | DEFAULT |
| 24 | TINT | 55 | |
| 25 | SHARP | 40 | DEFAULT |
| 26 | CB DL | 0 | DEFAULT |
| 27 | CR DL | 0 | DEFAULT |
| 28 | CB PED | 8 | DEFAULT |
| 29 | CR PED | 8 | DEFAULT |
| 30 | PARABOLA | 20 | |
| 31 | CORNER | 33 | DEFAULT |
| 32 | TRAPEZIU | 30 | |
| 33 | LEVEL | 17 | |
| 34 | SEP1 | 6 | |
| 35 | SEP2 | 34 |
Pictures (Sony KV-27V55)
Games
NES - Adventure Island 
NES - Alien 
NES - Alien close-up 
SNES - Megaman X 
SNES - Super Metroid 
RGB-Pi 
Sega Genesis - Alien 
SNES - Street Fighter
SNES - Street Fighter close-up 
Atari 2600 
Fixing the Sag
A68KZJ50X tubes have a noticeable sag. This is primarily due to the heavy deflection coil. It can be mostly corrected by reseating the yoke.
Sagging - SNES Adventure Island 
Reseating the deflection yoke 
Reseated deflection yoke 
Grid pattern 
RGB mod
RGB mod on Sony KV-27V55 is similar to KV-27V10. Speakers on this unit was huge compared to 27V10. Also, the other notable difference was the PiP board.
M board 
RGB mux board 
SCART port 
Back wire plugged 
Chassis, tube and more
Tube 
Chassis 
Chassis 
Back full 
Back open 
Back open top/down 
Pictures (Sony KV-27TS36)
Games
Tetris 
Super Mario World
Super Mario World 
Super Mario World 
RGB mod
Chroma and RGB wires. Location for R165 is slightly different 
Sync and audio wires 
Scart mounted 
Closeup 