Sony KV (G3F) L34MF1
Sony G3F chassis CRT RGB mod
Coming soon!
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
- Chroma: CXA1587S
Performing the RGB mod
Now that you roughly know what needs to be done, prepare for the mod. Place the board on a comfortable place. Make sure you are not putting pressure on the flyback or other components. Taking out the chassis is fairly straight forward on this CRT. There are few wires that needs to be disconnected.
- Degauss wire
- Power wire
- Ground wire attached to the neck board
- Yoke deflection coil wire
- Anode wire (this is the one with the rubber cap)
- Left and right audio wires
Please remember that wires 1-5 are critical for the CRT to function and should not be omitted. Having any of these wires disconnected while powering up can damage the board and can have adverse effects.
It should also be noted, on this CRT, you can do the RGB mod by just taking out the A board. This means you don't even need to remove the anode wire.
Methods to try
Method 1 (direct injection)
- Try injecting R, G, B signals directly to pins 47, 46, 45 directly
- Supply 5V via a diode (R9) and 1Kohm (R11) resistor to blank
- Use 75 ohm termination (R1, R2, R3)
- 0.1uF caps inline (R4, R5, R6)
Method 2 (mux method) - only try if method 1 doesn't work
- Remove the ground resistors R343, R344, R345 (1k)
- Inject RGB in-between 0.1uF and 3.9kohm resistors on RGB lines attached to pins 38, 37, 36 in chroma
- Use 75 ohm termination (R1, R2, R3)
- Use 750 ohm RGB inline (R4, R5, R6)
- Use a diode on R9 to feed 5V