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Automation, Cinema, Computers, Television Forum
Massive TV with black screen
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<blockquote data-quote="revjames" data-source="post: 503439" data-attributes="member: 5256"><p>Currently trying to repair a Cello C85ANSMT-4K LED TV. Its just over 2 years old and cost over £2K new. Customer says it just went blank when he switched it on one morning. Still playing sound but no picture at all. TV powers up but no backlighting coming on hence lack of picture. Backlighting is made up of 4 circuits of 2 strips running horizontally. PSU board also feeds backlighting, tuner and picture boards which are all getting respective voltages, 5V, 12V etc from PSU. I'm told customer has had settings for brightness and contrast at 100% so LEDs been running flat out. Tried to measure voltage going out to the backlights and it starts at over 100v quickly dropping to 0. </p><p></p><p>I think the LED backlights are cooked but how do you test them? not sure what voltage to apply to them and little info available online.</p><p></p><p>So its either the LEDS or the PSU board but need to know a bit more. Any TV experts out there? </p></blockquote><p></p>
[QUOTE="revjames, post: 503439, member: 5256"] Currently trying to repair a Cello C85ANSMT-4K LED TV. Its just over 2 years old and cost over £2K new. Customer says it just went blank when he switched it on one morning. Still playing sound but no picture at all. TV powers up but no backlighting coming on hence lack of picture. Backlighting is made up of 4 circuits of 2 strips running horizontally. PSU board also feeds backlighting, tuner and picture boards which are all getting respective voltages, 5V, 12V etc from PSU. I'm told customer has had settings for brightness and contrast at 100% so LEDs been running flat out. Tried to measure voltage going out to the backlights and it starts at over 100v quickly dropping to 0. I think the LED backlights are cooked but how do you test them? not sure what voltage to apply to them and little info available online. So its either the LEDS or the PSU board but need to know a bit more. Any TV experts out there? [/QUOTE]
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Massive TV with black screen
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