Panasonic CT-27SL15
Panasonic CT-27SL15 CRT RGB mod
This is a work in progress tutorial.
Other than the fact the resistor values are slightly different the RGB mod should be similar to Toshiba 27AF45
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
Performing the mod
STEP 1: Remove the following components
Remove RGB resistors to ground
- R141 (560Ω)
- R142 (560Ω)
- R143 (560Ω)
STEP 2: Disable VM (optional)
You can easily disable by disconnecting the VM cable on the neck board.
STEP 3: Connect RGB and blanking wires
STEP 4: Connect Sync, Audio and Ground wire
Connect the SIGNAL, AUDIO RIGHT, AUDIO LEFT, GROUND wires
STEP 5: 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 | 27F640 |
---|---|
CRT inline resistors | 2.7kΩ |
Removed ground resistor value | 560Ω |
Add diodes to RGB inline? | No |
Add diodes to blanking on chassis? | Yes |
RGB termination (R1, R2, R3) | 75Ω |
RGB inline resistors (R4, R5, R6) | 560Ω |
Audio LR (R7, R8) | 1kΩ |
Diode (R9) | 1N4148 |
Open (R10) | -- |
Blanking Resistor (R11) | shorted |
Add diodes to RGB lines | Yes |
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.