Taramps Smart 3k 5v issue

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#21
Not sure if you can see it but caused yellow discoloration also...noticed heat during testing and found r99
 

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#26
Taramps messaged me back saying they can't give me info on mc1 but will let me order it ... they mentioned it's programmable....but scope arrives tomorrow and I should be able to give u accurate part # at least ....BTW I truly appreciate your knowledge and willingness to help me with this issue Perry
 
#29
toddp said:
It does not go to pin 9 it goes to pin 15..
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Is it safe for me to apply voltage to board for 30 secs and check the output of regulator? Ic9 might be issue I checked all voltages at mc1 before the heat issue at r99 and no pin was above 1.79v so pin 15 was definitely not receiving 5 volt the 78m05 datasheet says it should be supplying ...sorry I'm newer to this and still learning
 
#31
They were both hot yesterday when I had r99 heat up .... I will supply mc1 part # when I receive scope tomorrow ... I will have to repair r99 trace ...this was first time I've powered it up since it heated up I think traces are burnt fans no longer run and voltages are not same yesterday .... how many years do they wait before they release diagrams lol ? Wiring diagram would be amazing
 
#32
I don't get the diagrams directly so I don't know when they're released.

Scope? Oscilloscope? Microscope?

Have you tried applying a small amount of white heatsink compound to the top of MC1 then wiping it off with a dry cloth to see if that made the number easier to read? You may need to clean it off with acetone before applying the heatsink compound.

Lift the output terminal of IC9 to see if the output returns to 5v.
 
#33
Ok I will do that rite now I will have to fix trace at r99 real quick but i will lift output of ic9 and check voltage will let you know shortly ..



I ordered a video microscope and it arrives tomorrow. It's just MIcroscope for electronics work ... it has a small screen to display the circuit boards and allows me to zoom in on hard to see components .... when I couldn't read mc1 I ordered it... mc1 is only component I can't read clearly it has 3 full rows of text in a very small font ...
 
#35
I have no voltage at all at ic9 .... when r99 overheated and desolder itself ic9 has had no voltage I assumed it was burnt trace where it discolored I repaired trace but still 0 volts at ic9 .... ill message I'm looking for other issues now
 
#37
Perry Babin said:
The Dr. Mom otoscope (sometimes available at Walmart) is VERY good for reading small markings and the color codes on components. It's small and you can easily use it without having to set up anything.
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Awesome I will go grab one first thing tomorrow its 11pm here so I can grab it in morning if my local Walmart has it....
Perry Babin said:
Do you have voltage on REG4?

What is the DC voltage on all 3 terminals of Q21?
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All voltages are 0 since r99 heat up I'm slowly checking every section .... so far I have 12.45 at all power supply transistors Q21 has12.45 power supply induct 12.45 ic3 feeding ps transistors 12.45 ......rest of board dead so far .....
 
#39
Perry Babin said:
The Dr. Mom otoscope (sometimes available at Walmart) is VERY good for reading small markings and the color codes on components. It's small and you can easily use it without having to set up anything.
Click to expand...
Awesome I will go grab one first thing tomorrow its 11pm here so I can grab it in morning if my local Walmart has it....
Perry Babin said:
Do you have voltage on REG4?

What is the DC voltage on all 3 terminals of Q21?
Click to expand...
Nothing at all reg4 ......... q21 right pin 12.45,,middle pin is doing pull down ,, left pin 12.43
 
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