Pioneer DEH-P5800MP

mike49504 · 14th March 2011, 02:31 AM

I got this in for repair . The guy said he was hooking it up to a cae battery to test it . He said he hit the case of it to the positive terminal of the battery.

Now the unit is dead. I opened it up and repaired a broken trace on the circuitboard but the unit is still dead.

Any ideas on where to look next??

Perry Babin · 14th March 2011, 04:48 AM

Do you have continuity between the case of the head unit and the ground wire coming out of the head unit's wiring harness?

luka · 14th March 2011, 09:10 AM

I think there is small fuse inside... chack that too

mike49504 · 14th March 2011, 04:48 PM

Yes i have continuity between the ground wire on the harness to the case of the unit.

The 10 amp fuse in the back of the unit tests fine also

luka · 14th March 2011, 04:50 PM

I was thinking about RCA fuse, smd like, small

Does it even turn on, anything?

mike49504 · 14th March 2011, 08:29 PM

I dont see any small fues (smd) but ill look again. Deck does nothing no lights noting its completely dead

luka · 14th March 2011, 08:33 PM

one or more of the important IC could be dead... do they even get supply?

Perry Babin · 14th March 2011, 09:12 PM

If it has a ribbon cable that connects the face to the main board, that cable could be defective which would prevent it from powering up. See if there is any oscillation on the oscillator pins of the microprocessor (pins 12 and 13). You'll have to set the scope probe to 10x to prevent loading the circuit. If there is oscillation, it may only need the ribbon. This is one of the problems with head units that use the ribbons. You almost always have to replace the ribbon to eliminate it as a possible problem.

mike49504 · 15th March 2011, 01:56 AM

Which one is the micro proscessor in this i have a 100 pin IC and a 44 pin IC

ian33 · 15th March 2011, 02:46 AM

check for more open traces,and unsolder the audio ic and try it

14th March 2011, 02:31 AM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Pioneer DEH-P5800MP I got this in for repair . The guy said he was hooking it up to a cae battery to test it . He said he hit the case of it to the positive terminal of the battery. Now the unit is dead. I opened it up and repaired a broken trace on the circuitboard but the unit is still dead. Any ideas on where to look next??

14th March 2011, 04:48 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Do you have continuity between the case of the head unit and the ground wire coming out of the head unit's wiring harness? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

14th March 2011, 09:10 AM	#3
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	I think there is small fuse inside... chack that too __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

14th March 2011, 04:50 PM	#5
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	I was thinking about RCA fuse, smd like, small Does it even turn on, anything? __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA

14th March 2011, 08:33 PM	#7
luka diyAudio Member Join Date: Sep 2005 Location: in Slovenia :)	one or more of the important IC could be dead... do they even get supply? __________________ home page @ http://www.classdaudio.co.cc @ 24/7 all year long I FEEL SLOVENIA


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14th March 2011, 04:48 PM	#4
mike49504 diyAudio Member Join Date: Sep 2006	Yes i have continuity between the ground wire on the harness to the case of the unit. The 10 amp fuse in the back of the unit tests fine also

14th March 2011, 08:29 PM	#6
mike49504 diyAudio Member Join Date: Sep 2006	I dont see any small fues (smd) but ill look again. Deck does nothing no lights noting its completely dead

14th March 2011, 09:12 PM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If it has a ribbon cable that connects the face to the main board, that cable could be defective which would prevent it from powering up. See if there is any oscillation on the oscillator pins of the microprocessor (pins 12 and 13). You'll have to set the scope probe to 10x to prevent loading the circuit. If there is oscillation, it may only need the ribbon. This is one of the problems with head units that use the ribbons. You almost always have to replace the ribbon to eliminate it as a possible problem. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

15th March 2011, 01:56 AM	#9
mike49504 diyAudio Member Join Date: Sep 2006	Which one is the micro proscessor in this i have a 100 pin IC and a 44 pin IC

15th March 2011, 02:46 AM	#10
ian33 diyAudio Member Join Date: Jun 2010 Location: the caribbean	check for more open traces,and unsolder the audio ic and try it

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