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Sony KV (BA-4) 27S45

Sony KV (BA-4) 27S45

Brett CutlerAbout 3 minCRT RGB modCRT component modKV-27S40KV-27S45KV-27S65

Sony KV-27S45 RGB mod

This largely follows the same method as the Sony KV-27S42 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

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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.

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

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.

Sony BA-4 chassis RGB mod mux diagram

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.

  1. Degauss wire
  2. Power wire
  3. Ground wire attached to the neck board
  4. Yoke deflection coil wire
  5. Anode wire (this is the one with the rubber cap)
  6. 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

BA-4 chassis - KV-27S45 RGB mod

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)

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. BA-4 chassis - KV-27S45 RGB mod

KV-27V40 - Heat shrink was used in the middle one to avoid shorts. BA-4 chassis - KV-27V40 RGB mod

KV-27V42 - Heat shrink was used in the middle one to avoid shorts. BA-4 chassis - KV-27V42 RGB mod

KV-27S42 - After adding diodes inline BA-4D chassis - KV-27S42 RGB mod

STEP 3: Solder R, G, B and blanking wires

BA-4 chassis - KV-27S45 RGB mod

STEP 4: Solder audio, sync and ground wires

BA-4 chassis - KV-27S45 RGB mod

BA-4 chassis - KV-27S45 RGB mod

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.

Buy your RGB mux board

TV ModelKV-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 linesYes

!Important. There is method to installing the micro board. Please follow this tutorial for the steps you should take to install the micro board.

BA-4 chassis - KV-27S45 RGB mod

BA-4 chassis - KV-27S45 RGB mod

BA-4 chassis - KV-27S45 RGB mod

BA-4 chassis - KV-27S45 RGB mod

BA-4 chassis - KV-27S45 RGB mod

Pictures

Games

BA-4 chassis - KV-27S45 RGB mod

BA-4 chassis - KV-27S45 RGB mod

BA-4 chassis - KV-27S45 RGB mod

BA-4 chassis - KV-27S45 RGB mod

Set

Chassis BA-4 chassis - KV-27S45 RGB mod

Yoke BA-4 chassis - KV-27S45 RGB mod

Neck Board BA-4 chassis - KV-27S45 RGB mod

Back label BA-4 chassis - KV-27S45 RGB mod

Tube () BA-4 chassis - KV-27S45 RGB mod

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