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| Beginners Road To Repair |
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| CJay:
Then I think there's only C38 left... |
| BrianHG:
--- Quote from: CJay on June 26, 2018, 07:54:30 pm ---Then I think there's only C38 left... --- End quote --- Seriously, there is like nothing else. If this isn't the problem, or by some fluke even C40 isn't the problem, we may be looking at a hidden grown 'Tin Whisker' short between 2 adjacent pads somewhere on the PCB. |
| james_s:
The best way to learn to repair things is practice, practice practice, with each success (or failure) you will learn something. Look around on trash day for stuff to scavenge, or post an ad in a local forum asking for free broken electronics to practice on. It took me a lot of practice to get to where i was fixing more things than I was breaking worse than they started. |
| don@cascadefellowship.org:
--- Quote from: CJay on June 26, 2018, 07:54:30 pm ---Then I think there's only C38 left... --- End quote --- Isn't it always the last thing you check!? LOL. After removing C38, the short is gone! I'm going to re-install the components I removed in reverse order checking after each component to make sure things are still cool. |
| don@cascadefellowship.org:
--- Quote from: CJay on June 26, 2018, 07:24:11 pm ---OK, shame and I should have thought to mention about the capacitors being polarised but we can deal with that in a bit. Handily the two 8 pin chips are connected to the 12V rail with a wire link each so we can lift one end of them to isolate the chips, I've circled them --- End quote --- Now how do I find out the polarity of these tantalum caps? And, equally important, how do I tell which way they go back in the PCB? There's no indicator on the board for polarity like the other caps and I'm not sure how to read the schematic to determine which way they go in. For example, I can see that C32 feeds into the positive pin of IC6A while passing R63. Can I assume that the IC6A side of the tantalum cap is supposed to be the positive side? |
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