Toshiba 27AFX54+
Toshiba 27AFX54+ CRT RGB mod
This tutorial covers the RGB mod for Toshiba 27AFX54 (Cinema Series)
Picture from Toshiba 27AFX54 (Cinema Series)
NES Adventure Island
Please also see other Toshiba AF series mods, as the instructions are more or less the same.
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
- Tube: LG Philips
Schematics
Warning
27AF54X model has a minor interference that is noticeable with certain color gradients (grey, purple) on the screen.
This interference is reduced by attaching the Wii component cables and audio cables. This issue was noticed on two TV's of the same model #, so it is not specific to the TV. This interference was not noticed on Toshiba 27AF43, which has a completely different PCB layout.
PCB
Points where the R, G, B and Blank wires should be connected are marked "X". Pink boxes show the resistors, diodes that needs to be removed.
Performing the mod
STEP 1: Remove the following components
Remove RGB resistors to ground
- R141
- R142
- R143
(Optional) Removed the diodes that enable the edge enhancer. Doesn't do much to fix the minor jitter/interference seen on this particular TV. However, simplifies the RGB lines.
- D102
- D104
- D108
- D107
- D103
STEP 2: Connect RGBs, Blanking and Audio
- Brown wire = blank
- Red wire = red
- Blue wire = blue
- Green wire = green
- Yellow wire = csync
- Organge wire = video ground
- Grey wire = audio right
- White wire = audio left
- Purple = audio ground
- Black = common ground
Connect the R, G, B and blanking (orange) wire. 
Connect the SIGNAL, AUDIO RIGHT, AUDIO LEFT, GROUND wires 
Full mod 
STEP 3: Prepare your RGB mux circuit
Below 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 precalculated resistor values.
M61283FP can handle a peak to peak voltage of 0.7 in the external RGB lines.
Depending on the RGB/OSD stock resistors your CRT has, use the below inline resistors.
| TV Model | 27AF4x | 27AF4x | 27AF4x |
|---|---|---|---|
| RGB/OSD stock resistors | 3.3kΩ | 3.9kΩ | 6.8kΩ |
| Audio LR (R7, R8) | 1kΩ | 1kΩ | 1kΩ |
| RGB termination (R1, R2, R3) | 75Ω | 75Ω | 75Ω |
| RGB inline resistors (R4, R5, R6) | 470Ω | 560Ω | 1kΩ |
| Diode (R9) | 1N4148 | 1N4148 | 1N4148 |
| Blanking Resistor (R11) | shorted | shorted | shorted |
Sample Toshiba 20AF44 RGB Mux Adapter 
STEP 4: 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?
Toshiba 27AFX54 Pictures
OSD Mux Mod
Games
SNES - Contra 3 
SNES - Contra 3 
SNES - R-Type 
SNES - Super Metroid 
NES - Adventure Island
Test patterns
SMPTE 
Convergence 
Grid - Geometry (yoke can be tilted a bit) 
Service Menu Settings
| NUM | SETTING | VALUE | FIXED |
|---|---|---|---|
| 00 | OSD | 27 | DEFAULT |
| 01 | |||
| 02 | H VCO | 3 | DEFAULT |
| 03 | H PHASE | 10 | |
| 04 | AFC GAIN | 6 | |
| 05 | V SHIFT | 2 | DEFAULT |
| 06 | H.SIZE | 41 | |
| 07 | V.SIZE | 32 | |
| 08 | V.LIN | 29 | |
| 09 | VS.CORR | 25 | DEFAULT |
| 10 | R.DRV_M | 74 | |
| 11 | B.DRV_M | 68 | |
| 12 | R.BIAS_M | 47 | |
| 13 | G.BIAS_M | 44 | |
| 14 | B.BIAS_M | 32 | |
| 15 | BRI.MAX | 105 | DEFAULT |
| 16 | BRI.CENT | 88 | |
| 17 | BRI.MIN | 55 | DEFAULT |
| 18 | CONT.MAX | 70 | |
| 19 | CONT.CENT | 60 | DEFAULT |
| 20 | CONT.MIN | 10 | DEFAULT |
| 21 | COL.MAX | 80 | DEFAULT |
| 22 | COL.CENT | 65 | |
| 23 | COL.MIN | 0 | DEFAULT |
| 24 | TINT | 50 | |
| 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 | 51 | |
| 31 | CORNER | 33 | |
| 32 | TRAPEZIU | 27 | |
| 33 | LEVEL | 37 | |
| 34 | SEP1 | 11 | |
| 35 | SEP2 | 40 |
Recapping
| V | uF | Location | Current Temp | Diameter/Size | Location Description |
|---|---|---|---|---|---|
| 50 | 2.2 | C406, C422 | 85 | 5.1mm | Deflection |
| 25 | 2200 | C408 | 85 | 12.6mm | Deflection |
| 50 | 10 | C409 | 85 | 5mm | Deflection |
| 35 | 100 | C407 | 85 | 6.4mm | Deflection |
| 250 | 1 | C443 | 85 | 8mm | Deflection |
| 50 | 22 | C403 | 85 | 5.1mm | Deflection |
| 100 | 22 | C430 | 85 | 6.5mm | Deflection |
| 16 | 100 | C411 | 85 | 5.1mm | Deflection |
| 35 | 2200 | C413 | 85 | 16.2mm | Deflection |
| 250 | 22 | C426 | 85 | 10.2mm | Deflection |
| 16 | 1000 | C511, C527, C542, C540 | 85 | 10.2mm | Power |
| 50 | 10 | C504, C514 | 85 | 5mm | Power |
| 25 | 47 | C509 | 85 | 5.2mm | Power |
| 10 | 2200 | C537 | 85 | 10.2mm | Power |
| 35 | 2200 | C501 | 85 | 12.6mm | Power |
| 25 | 1000 | C1009, C1004 | 85 | 10.1mm | Audio |
| 35 | 1000 | C1003 | 85 | 12.85mm | Audio |
| 16 | 1000 | C629 | 85 | 10.2mm | Chroma |
| 50 | 6.8 | C442 | 105 | 18.15mm | Deflection |
Capacitor codes and references
| Capacitor Codes | Board Function |
|---|---|
| C4xx | Deflection |
| C5xx | Power |
| C6xx | |
| C7xx | |
| C8xx | Neck Board |
| C9xx | Tuner |
| C10xx | Audio |