Sony 21 white spot when turn off

[sira_c]

I got Sony TV and when i switch off it there will be a white spot on the middle for less than second. how to fix this issue. this is KV-J21

 

[Nigel Goodwin]

Do you have a schematic?, there should be part of the circuit specifically designed to prevent that, as it will fairly rapidly burn a mark in the middle of the screen.

To be honest, it's so many years since I did CRT TV's, I can't remember where it might be on a Sony? - but you might try looking round the beam limiter (ABL) circuit, it 'may' be associated with that. Have a look at R816, R856 and R857 which set the operating point.

TVTech might come along?, he's still repairing CRT sets.

 

[JimB]

Don't like watching the white spot fade away?
That is the best part of many tv programmes.

JimB

 

[sira_c]

Thank you for the update. this is the similar diagrams as this uncommon model - KV-J21 MF1. recently I replaced the fly and TDA 8375A as both faulty, and ABL resister as well. The TV looks very colorful and bright now. small color patch on right side - see CRT.jpg. and LCD show the correct color . issue is the blue/white dot during shut off

Do you have a schematic?, there should be part of the circuit specifically designed to prevent that, as it will fairly rapidly burn a mark in the middle of the screen.

To be honest, it's so many years since I did CRT TV's, I can't remember where it might be on a Sony? - but you might try looking round the beam limiter (ABL) circuit, it 'may' be associated with that. Have a look at R816, R856 and R857 which set the operating point.

TVTech might come along?, he's still repairing CRT sets.