Sony KV (AA-2) 35V35
Sony KV-35V35, AA-2 chassis CRT RGB mod
You can find a highly detailed post about the AA-2 RGB mod in a separate article. This article delves into the distinctions of the KV-35V35 CRT, where its audio and video connectors are located on a daughter board. As a result, the connections for sync and audio need to be made in slightly different locations.
Below instructions should also work for the below models.
- Sony KV-35V35
- Sony KV-35V45
- Sony KV-35V75
35" CRT is a real beast. This is a picture from the back view.
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
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.
- Chassis: AA-2
- Tube: A89LJT80X (SDP Made in USA)
RGB mux diagram
If you are building your own circuit, this diagram should help. The diagram is for KV-27S22, it will also work for other AA-2 chassis based Sony CRTs. This diagram is very similar to AA-2D chassis.
Step 1: Remove the following components
Remove the following resistors
Inject R, G, B at the below locations
- R1123 (Red)
- R1128 (Green)
- R133 (Blue)
Below picture shows the resistors that were removed and where we are going to connect the R, G, B and blanking wires.
Step 2: Add a diode to blanking
Blanking diode added. Helps reduce interference. This mod was performed without shielded cables internally and absolutely no interference was noticed.
picture from kv-27s22
Step 3: Connect audio and sync wires
Below is slightly different compared to the 27" CRTs that doesn't have a daughter board.
- Ground = Purple/Black wires
- Yellow = Sync
- White = Left Audio
- Grey = Right Audio
Sync is wired to Main-Y on CN270, and audio is wired to Main-L and Main-R on CN271.
Step 4: Build your 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.
|Audio LR (R7, R8)
|RGB termination (R1, R2, R3)
|RGB inline resistors (R4, R5, R6)
|Blanking Resistor (R11)
|Blanking Ground Resistor (R10) optional
|Add diodes to RGB lines
It is important to note that the blanking ground resistor (R10) is necessary to prevent strange black backgrounds from appearing on the KV-27S22 OSD text.
Step 5: 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?
Perfect clearance with the v1.2B mini RGB mux board