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Apple Computing Products:
macOS - Notebook Hardware
dropped laptop-no image
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<blockquote data-quote="cwa107" data-source="post: 348181" data-attributes="member: 24098"><p>The inverter can be tricky to diagnose.</p><p></p><p>Just to give you some background on how LCD screens work - there are four major components to LCD screens. The screen itself, the CCFL tube (think of it like a flourescent light bulb), the inverter (a transformer that steps up voltage to the light bulb) and the flex cable (provides a connection between the systemboard and the monitor.</p><p></p><p>If you can see a faint image on the screen, then it's likely that either the CCFL tube or the inverter has failed. After a drop, I would lean toward the CCFL tube being broken because it's made of glass. The inverter is solid-state circuitry and ideally shouldn't be very susceptible to damage based on force. </p><p></p><p>If you *can not* see anything on the screen and the screen does not have a crack, then it's like just that your flex cable is disconnected or damaged. If this is the case, you just need to trace the flex cable from the back of the LCD itself to the motherboard and make sure the connections are solid and inspect for tears.</p><p></p><p>It can be moderately difficult to disassemble your LCD bezel and laptop, but anyone who is comfortable with taking apart the delicate plastics that comprise today's electronics should be able to do so following the instructions from iFixIt.com</p><p></p><p>A lot of computer repair centers will suggest replacement of the inverter when there is a display problem and the screen is not cracked - and with good reason - it is a common point of failure depending on its design. However, if the problem surfaces after a severe shock, I wouldn't be so quick as to jump to that conclusion (especially if you have absolutely nothing on your screen). </p><p></p><p>Before I tell you what to try first, I need to know if you can see any image on the screen at all.</p></blockquote><p></p>
[QUOTE="cwa107, post: 348181, member: 24098"] The inverter can be tricky to diagnose. Just to give you some background on how LCD screens work - there are four major components to LCD screens. The screen itself, the CCFL tube (think of it like a flourescent light bulb), the inverter (a transformer that steps up voltage to the light bulb) and the flex cable (provides a connection between the systemboard and the monitor. If you can see a faint image on the screen, then it's likely that either the CCFL tube or the inverter has failed. After a drop, I would lean toward the CCFL tube being broken because it's made of glass. The inverter is solid-state circuitry and ideally shouldn't be very susceptible to damage based on force. If you *can not* see anything on the screen and the screen does not have a crack, then it's like just that your flex cable is disconnected or damaged. If this is the case, you just need to trace the flex cable from the back of the LCD itself to the motherboard and make sure the connections are solid and inspect for tears. It can be moderately difficult to disassemble your LCD bezel and laptop, but anyone who is comfortable with taking apart the delicate plastics that comprise today's electronics should be able to do so following the instructions from iFixIt.com A lot of computer repair centers will suggest replacement of the inverter when there is a display problem and the screen is not cracked - and with good reason - it is a common point of failure depending on its design. However, if the problem surfaces after a severe shock, I wouldn't be so quick as to jump to that conclusion (especially if you have absolutely nothing on your screen). Before I tell you what to try first, I need to know if you can see any image on the screen at all. [/QUOTE]
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Apple Computing Products:
macOS - Notebook Hardware
dropped laptop-no image
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