Question about Apple iMac G5 Desktop

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What component on my imac motherboard causes my screen to go blank with vertical strips and needs to be replaced?

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That would be the LCD. Possibly the whole logic board, but more than likely th LCD

Posted on Mar 13, 2011

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LG model 47LN5700-UH LED TV. There is a single thin vertical line on the screen. I have changed the LED/Power Supply board and LED strips. What might be causing the vertical line?


You have wasted your time and money. The LED power supply and LED strips are only the backlighting. The only thing that might fix is a situation where you have a blank screen with the sound working.

If you don't know what you're doing, DON'T OPEN THE TV UP TO FIX IT, THERE ARE HAZARDOUS VOLTAGES ON THE POWER SUPPLY BOARD, EVEN WEEKS AFTER THE TV IS UNPLUGGED!

If you don't know how to do it yourself, find some local Electronic repair shops, get quotes, try to find reviews on the shops.

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CHECK C2C52 10 UFD @ 50 V OFF THE BASE OF Q2C51 ON THE SIGNAL PCB. 2. CHECK C2P05 100 UFD 16 V OFF PIN 3 OF IC2P01 AND IC2P01 PART # 270P466020 (9-VOLT REGULATOR). BOTH ARE ON THE SIGNAL PCB.

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Faded screen


Hi Isobel,

Not much information there...

iMacs tend to start displaying vertical lines, lie white faded strips as they age.. unfortunately, it's like iMac Alzheimers.. nothing to be done under $600

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The monitor has vertical lines and now vertical black and white strips


Check your cable connections. If those are fine, you need a new monitor.

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Power up IMac but screen blank, fan on, light on but no response


I have one doing exactly this at the moment. It had gone to sleep and the fans were going like crazy. I think it is a Motherboard failure (it happened with many G5 iMacs), this one has been replaced once already, and I can't actually get it to install anything. I'm taking it apart tomorrow to see what I can find inside. If I fond anything I'll let you know.

Aug 07, 2009 | Apple iMac G5 Desktop

1 Answer

Delayed video, audio comes first


It's normal for Sony TVs to have a delay in the video. The screen stays blanked until the circuitry in the set has decided that the picture tube is operating correctly. The screen can remain blanked due to a number of causes. Bad solder connections or components in the vertical output stage are common. Also, Sony sets automatically adjust some tube voltages. If the tube has aged enough or component values in the set have changed and the adjustments don't keep the values in the correct range, the screen will blank out. Intermittent components or connections in the set's video stages or source switching can cause screen blanking. Unfortunately, this is one of the tougher Sony problems to troubleshoot. It usually requires the schematic and an oscilloscope to track down.

May 03, 2009 | Televison & Video

2 Answers

My 36 inch RCA tv has black bars on the top and bottom of the screen. The color is also dark even in daylight scenes. Can you help with this color.


as a general rule, vertical faults can be divided into two types: ones that cause geometric distortion (a circle will not be round) and those that simply black out a portion of the screen. the former are faults in the vertical oscillator, drive, or output stages. the latter are blanking faults. blanking faults are almost always caused by electrolytic capacitors changing value and thereby changing the timing of the pulses which blank the screen during vertical retrace. In other words, the pulses are turning off the video signals at the wrong time. the most common true vertical fault is geometric distortion and a foldover of white lines at the top of the screen. this is almost always caused by the electrolytic capacitor on or near the collector of the vertical output transistor or part of the IC which has the supply voltage (B+) on it. In the old tube days, the general rule was that bottom distortion was in the cathode of the output tube and distortion at the top was caused by a fault in the drive circuit. this may help the solution!!

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Bad graphics card on an Intel iMac?


Lines on an iMac are usually a sign of a bad monitor not video card. The technicians at the Genius Bar are anything but genius.

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1 Answer

Philips LCD model 26TA1000, vertical lines and blank white screen with no picture


it would be easier to find it stripped from a damaged set on ebay.
I see several there but need the part number to search
of course you may purchase that and find it to be the lcd driver.hopefully not.

Feb 17, 2008 | Televison & Video

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IMac Monitor


What type of monitor is this? If it is an LCD screen, you may have some dead pixels. Please reply with some more details about your specific monitor.

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