Toshiba 27AF43+

SuntharAbout 5 minCRT RGB mod

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)

img NES Adventure Island

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

CRT safety

Warning

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

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27AF54X

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Note

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

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27AF54X

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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

imgimg

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 Model27AF4x27AF4x27AF4x
RGB/OSD stock resistors3.3kΩ3.9kΩ6.8kΩ
Audio LR (R7, R8)1kΩ1kΩ1kΩ
RGB termination (R1, R2, R3)75Ω75Ω75Ω
RGB inline resistors (R4, R5, R6)470Ω560Ω1kΩ
Diode (R9)1N41481N41481N4148
Blanking Resistor (R11)shortedshortedshorted

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?

Toshiba 27AFX54 Pictures

OSD Mux Mod

img

Games

SNES - Contra 3 img

SNES - Contra 3 img

SNES - R-Type img

SNES - Super Metroid img

NES - Adventure Island img

Test patterns

SMPTE img

Convergence img

Grid - Geometry (yoke can be tilted a bit) img

Service Menu Settings

27AF43

NUMSETTINGVALUEFIXED
00OSD25
01
02H VCO3DEFAULT
03H PHASE13
04AFC GAIN6DEFAULT
05V SHIFT2DEFAULT
06H.SIZE24
07V.SIZE31
08V.LIN20
09VS.CORR38DEFAULT
10R.DRV71
11B.DRV71
12R.BIAS142
13G.BIAS142
14B.BIAS142
15BRI.MAX150DEFAULT
16BRI.CENT83
17BRI.MIN50DEFAULT
18CONT.MAX87
19CONT.CENT64DEFAULT
20CONT.MIN16DEFAULT
21COL.MAX90DEFAULT
22COL.CENT65
23COL.MIN00DEFAULT
24TINT55
25SHARP40DEFAULT
26CB DL0DEFAULT
27CR DL0DEFAULT
28CB PED8DEFAULT
29CR PED8DEFAULT
30PARABOLA20
31CORNER33DEFAULT
32TRAPEZIU30
33LEVEL17
34SEP16
35SEP234

27AFX54

NUMSETTINGVALUEFIXED
00OSD27DEFAULT
01
02H VCO3DEFAULT
03H PHASE10
04AFC GAIN6
05V SHIFT2DEFAULT
06H.SIZE41
07V.SIZE32
08V.LIN29
09VS.CORR25DEFAULT
10R.DRV_M74
11B.DRV_M68
12R.BIAS_M47
13G.BIAS_M44
14B.BIAS_M32
15BRI.MAX105DEFAULT
16BRI.CENT88
17BRI.MIN55DEFAULT
18CONT.MAX70
19CONT.CENT60DEFAULT
20CONT.MIN10DEFAULT
21COL.MAX80DEFAULT
22COL.CENT65
23COL.MIN0DEFAULT
24TINT50
25SHARP40DEFAULT
26CB DL0DEFAULT
27CR DL0DEFAULT
28CB PED8DEFAULT
29CR PED8DEFAULT
30PARABOLA51
31CORNER33
32TRAPEZIU27
33LEVEL37
34SEP111
35SEP240

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
VuFLocationCurrent TempRadiusLocation Description
35100C407856.4mmDeflection
351000C4138512.7mmDeflection
501C406855.3mmDeflection
5010C409855.6mmDeflection
5022C403855.3mmDeflection
10022C430856.41mmDeflection
25022C4268512.6mmDeflection
6.32200C52310510.3mmDeflection
251000C408105Deflection
16010C864, C854858.07mmNeck Board
161000C5508510mmPower
162200C5278512.5mmPower
351000C501, C5148512.7mmPower
5010C539855.6mmPower
25330C1011858.3mmSound
251000C1004, C10098510.3mmSound
351000C10038512.7mmSound
5022C1007855mmSound
10100C9165.08mmTuner
504.7C905, C904854.2mmTuner
5010C907855.6mmTuner
16470C728858mmAV
161000C6298510mmChroma
  • C916, C905, C904 (put these caps at the bottom, if you want to install an XRGB mini adapter)

27AFX54

VuFLocationCurrent TempRadiusLocation Description
502.2C406, C422855.1mmDeflection
252200C4088512.6mmDeflection
5010C409855mmDeflection
35100C407856.4mmDeflection
2501C443858mmDeflection
5022C403855.1mmDeflection
10022C430856.5mmDeflection
16100C411855.1mmDeflection
352200C4138516.2mmDeflection
25022C4268510.2mmDeflection
161000C511, C527, C542, C5408510.2mmPower
5010C504, C514855mmPower
2547C509855.2mmPower
102200C5378510.2mmPower
352200C5018512.6mmPower
251000C1009, C10048510.1mmAudio
351000C10038512.85mmAudio
161000C6298510.2mmChroma
506.8C44210518.15mmDeflection

Capacitor codes and references

Capacitor CodesBoard Function
C4xxDeflection
C5xxPower
C6xx
C7xx
C8xxNeck Board
C9xxTuner
C10xxAudio
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