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Red light logic board - Apple Power Mac G5 Desktop

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  • Apple Master
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Red light either means the side is removed from unit or there is a cooling issue if it is a G5 or newer. G4 or older that is normal.

Posted on Oct 15, 2013

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How do i fix it


The logic board is faulty. That chip can't be replaced by normal soldering techniques. Replace the board. If you wish to get some details; visit the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Jul 11, 2015 | LG Televison & Video

1 Answer

My TV intermittently will not power on properly. Should I replace the logic board or the power supply board?


easy answer I always replace the least expensive part first. If it doesn't fix it at least you have a new part. since the logic board talks to the power board it could be either one.

May 17, 2015 | Hitachi Televison & Video

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2 red lights on logic board


I don't see that in the service manual. You should give some symptoms and details about the power on LED, fans PSU etc. You need to verify the PSU is good before you get to the logic board.

Jul 22, 2013 | Apple Power Mac G5 Desktop

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My box will only show a red light. I have tried unplugging it to restart but it will only show a red light and is providing no input to the TV. Had been working fine before this.


This is a common problem. There are several capacitors on the power supply and logic board that are bad. Replacement of these parts has restore all units that I have looked at.
On the power supply I would replace at a minimum:
C14 - 4.7ufd 50v UPW1H4R7MDD
C4 - 1ufd 50v UPW1H010MDD
C8 - 100ufd 25v UHE1E101MED
C10 - 470ufd 16v UHE1C471MPD
C12 - 1000ufd 10v UHE1A102MPD

There are 4 others in the supply that were not grossly bad.
C1 - 22ufd 400v EEU-EE2G220
C7 - 220ufd 25v UHE1E221MPD
C11 - Same as C10
C13 - Same as C10

Logic board:
E5 - 33uf 35v EEU-FM1A471
E6 - Same as E5

Part Numbers of replacement caps are Nichicon or Panasonic.

Note: Caps on the logic board are extremely hard to replace due to the internal ground plane.

Contact me if this is beyond your skills for possible repair.

Feb 06, 2011 | Digi Channel Master/tal to Analog...

1 Answer

Black macbook 13 will not boot.


you have logic board problem, check out if the fan, processor , harddisk working if not then it is logic board.
go to apple care and get the assistent.
plz rate this article. if you satisfy..

Jul 10, 2009 | Apple MacBook 13"White /2.0Ghz Intel Core2...

1 Answer

TV does not turn on/red led flashes 7 times in front


this is common issue with this model and through your troubleshooting is tied to y main board. blinking led on logic main in normal operation. when replacing y main always good idea to replace y upper and lowe buffer boards as they complete a circuit and sometimes replacing one without other could cause additional failure on remaining boards

Aug 10, 2008 | Philips 42PF7320 42 in. EDTV-Ready Plasma...

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