Sony Trinitron KV-BM142M70 User Manual

• L

  Leah MartinezAug 7, 2025

  How to fix snowy picture and noisy sound on Sony Trinitron KV-BM142M70 TV?

  

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  • S

    Steven VelasquezAug 7, 2025

    If you are experiencing a snowy picture and noisy sound on your Sony TV, here are a few things to try: * Check the antenna cable and its connections at the TV, VCR, and the wall to ensure they are secure and undamaged. * Verify your antenna setup and channel presetting. If needed, contact a Sony dealer for advice, or display the “Channel Setup” menu and select “Manual Program” to preset the channel again. * If the signal transmission is weak, display the “Channel Setup” menu and set the “Signal Booster” to “Auto” from “Manual Program”. You might also consider using an external booster.

    

    Reply
• M

  mbakerAug 21, 2025

  What to do if my Sony Trinitron KV-BM142M70 TV has distorted picture and noisy sound?

  

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  • D

    Dustin KingAug 21, 2025

    If your Sony TV is showing a distorted picture and producing noisy sound, it could be due to broadcast signals being too strong. If you are using an external booster, try turning it off or disconnecting it. Alternatively, you can display the “Channel Setup” menu and set the “Signal Booster” to “Off” from “Manual Program”.

    

    Reply

Sony Trinitron KV-BM142M70 Specifications

General

Screen Size	14 inches
Display Technology	CRT
Brand	Sony
Model	KV-BM142M70
Aspect Ratio	4:3
Inputs	Composite, RF
Weight	12 kg
TV Type	Standard Definition TV

Summary

Self Diagnostic Function

Page: 5

Diagnostic Test Indicators

Explains STANDBY indicator flash codes for problem diagnosis.

Display of Standby Indicator Flash Count

Lists flash counts for various diagnostic items.

Self-Diagnostic Screen Display

Procedure to display and interpret self-diagnosis results on screen.

Handling of Self-Diagnostic Screen Display

Guidance on managing and clearing diagnostic screen results.

Disassembly

Page: 8

Picture Tube Removal

Detailed instructions for safely removing the CRT picture tube.

Set-Up Adjustments

Page: 10

Beam Landing

Procedure for adjusting beam landing for picture alignment.

Convergence

Steps for adjusting horizontal and vertical convergence.

Focus Adjustment

Procedure for adjusting the picture focus.

G2 (Screen) Adjustments

Instructions for adjusting the G2 (screen) grid on the FBT.

White Balance Adjustment

Procedure for adjusting the white balance settings.

Circuit Adjustments

Page: 14

Adjustments With Commander

Guide on using the remote commander for service adjustments.

Adjustment Method

Picture Quality Adjustments

Deflection Adjustment

Picture Distortion Adjustment

Diagrams

Page: 34

Block Diagram

Overall system block diagram of the TV.

Schematic Diagram Information

A Board – Power Supply (Block 003) Schematic Diagram

Voltage Measurement and Waveforms

Page: 44

A Board Voltage List and Waveform

Lists specific pin voltages and waveforms for A board ICs.

C Board Voltage List and Waveform

Electrical Parts List

Page: 52

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