# Toshiba 27AF43+ CRT RGB mod

This tutorial covers the RGB mod for the below models.

  • Toshiba 27AF43
  • Toshiba 27AF44
  • Toshiba 27AF45
  • Toshiba 27AF46
  • Toshiba 27AFX54 (Cinema Series)

img Picture from Toshiba 27AFX54 (Cinema Series)

Please also see other Toshiba AF series mods, as the instructions are more or less the same.

# CRT safety

DANGER

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

# Schematics

# 27AF43

img

# 27AF54X

img

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 TB. This intereference 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.

# 27AF43

img

# 27AF54X

img

# Performing the mod

# STEP 1: Remove the following components

# 27AF43

Remove RGB resistors to ground

  • R141
  • R142
  • R143

There were no coupling capacitors to ground that needed to be removed

Did not remove C131.

Remove diodes that enable VM from the RGB lines

  • D107
  • D108
  • D110

# 27AF54X

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

img img

# 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

# 27AF43

Connect the R, G, B and blanking (orange) wire. img

Connect the SIGNAL, AUDIO RIGHT, AUDIO LEFT, GROUND wires img

# 27AFX54

Connect the R, G, B and blanking (orange) wire. img

Connect the SIGNAL, AUDIO RIGHT, AUDIO LEFT, GROUND wires img

Full mod img

# 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.

Buy your RGB mux board

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 img

# 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?

# Pictures

# Finished mod

# Test patterns

# Service Menu Settings

# 27AF43

NUM SETTING VALUE FIXED
00 OSD 25
01
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

# 27AFX54

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

# Capacitor list

# 27AF43

  • C407, C406, C409, C403 are capacitors that must be replaced
  • C523, C408 are good capacitors (105C) and no need to replace
V uF Location Current Temp Radius Location Description
35 100 C407 85 6.4mm Deflection
35 1000 C413 85 12.7mm Deflection
50 1 C406 85 5.3mm Deflection
50 10 C409 85 5.6mm Deflection
50 22 C403 85 5.3mm Deflection
100 22 C430 85 6.41mm Deflection
250 22 C426 85 12.6mm Deflection
6.3 2200 C523 105 10.3mm Deflection
25 1000 C408 105 Deflection
160 10 C864, C854 85 8.07mm Neck Board
16 1000 C550 85 10mm Power
16 2200 C527 85 12.5mm Power
35 1000 C501, C514 85 12.7mm Power
50 10 C539 85 5.6mm Power
25 330 C1011 85 8.3mm Sound
25 1000 C1004, C1009 85 10.3mm Sound
35 1000 C1003 85 12.7mm Sound
50 22 C1007 85 5mm Sound
10 100 C916 5.08mm Tuner
50 4.7 C905, C904 85 4.2mm Tuner
50 10 C907 85 5.6mm Tuner
16 470 C728 85 8mm AV
16 1000 C629 85 10mm Chroma
  • C916, C905, C904 (put these caps at the bottom, if you want to install an XRGB mini adapter)

# 27AFX54

V uF Location Current Temp Radius 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