![Sony KV (BA-4) 27S45](/articles/sony_27s45_metroid_cover.jpg)
Sony KV (BA-4) 27S45
Sony KV-27S45 RGB mod
This largely follows the same method as the Sony BA-4D RGB mod article. Primary difference here is the use of micro mux board. Pictures were submitted by Brett Cutler.
Instructions below should also apply to these models:
- KV-27S40
- KV-27S45
- KV-27S65
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
Sony KV-27S45
- Manufactured: November 1998, Mexico or January 1999, Mexico
- NTSC, 60 Hz - 140W
- Chassis: BA-4
- Tube: A68LML50X
- Jungle Chip: CXA2061S
- OSD Chip: M37273MF-255SP
Mux diagram
If you are building your own circuit, this diagram should help. The diagram is for KV-27V40, it will also work for any other BA-4 chassis.
Performing the 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.
STEP 1: Remove the following components
Remove the following components. RGB resistors to the ground. Please always measure and mark them, so that you know you are removing the correct partrs.
- R087 (680Ω)
- R088 (680Ω)
- R089 (680Ω)
STEP 2: Add RGB inline diodes (optional, but recommended)
To reduce interference, it is recommended to add these inline diodes. You will be lifting one side of the R025, R026, R027 and add diodes. Pay attention to the diode direction and how it was installed. This is extremely important. Otherwise, OSD will not work.
KV-27S45 - Heat shrink was used in the middle one to avoid shorts.
KV-27V40 - Heat shrink was used in the middle one to avoid shorts.
KV-27V42 - Heat shrink was used in the middle one to avoid shorts.
KV-27S42 - After adding diodes inline
STEP 3: Solder R, G, B and blanking wires
STEP 4: Solder audio, sync and ground wires
Tips
The Sony KV-27S40 model lacks an S-Video input, even though the components required for it are already populated. If you wish to use the S-Video Luma input for sync injection as seen in the photo, it is necessary to change the ID-1 setting in the service menu from "1" to "17" to enable the S-Video input. You should also wire the S-Video detection pin to ground using a SPST switch.
STEP 5: Build your mux board
Below mod uses the micro 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.
TV Model | KV-27V45 |
---|---|
Audio LR (R7, R8) | 1kΩ |
RGB termination (R1, R2, R3) | 75Ω |
RGB inline resistors (R4, R5, R6) | 1kΩ |
Diode (R9) | 1N4148 |
Blanking Resistor (R11) | 1kΩ |
Add diodes to RGB lines | Yes |
!Important. There is method to installing the micro board. Please follow this tutorial for the steps you should take to install the micro board.
Pictures
Games
Set
Chassis
Yoke
Neck Board
Back label
Tube ()