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Intermittent Traces
SavannahLion:
My LCD flat screen has weird behavior. 90% of the time, if I push the screen one way on a specific side, half the screen goes to crap. If I push the screen the other way, it clears up. Somewhere there's a bad connection. I can tell it's going to be an all day thing. :banghead:
So while I'm getting my materials together and trying to shoo the curious kids away and trying to explain to the wife why the baby is sucking on the spool of solder, I realized that I never asked this question.
If a trace (not a soldered joint) has a intermittent connection due to a cracked PCB, is the correct procedure to completely severe the trace and add the jumper or just add the jumper and be done with it?
I repaired two minor control boards that had cracked substrate without cleaning the cracked area and now I'm wondering if I did those repairs correctly. They seem to work ok during tests but I haven't installed them so I don't know if they're reliable repairs.
lilshawn:
--- Quote ---f a trace (not a soldered joint) has a intermittent connection due to a cracked PCB, is the correct procedure to completely severe the trace and add the jumper or just add the jumper and be done with it?
--- End quote ---
well, i use glue to reinforce the board so further flexing will not cause it to break again. then depending on the extent either jump it, or just bridge it with solder.
judged by your description, you likely have a loose plug that feeds the LCD panel itself... is a wide single edge connector, it will be the only one going to the panel. it's common to get worked loose and cause all sorts of issues.
SavannahLion:
That's what I figured on the cracked PCB. Those repairs I did are low frequency applications. One is the control board to a joystick if that gives you any ideas.
If that's the case it'll be oodles easier than trying to replicate the problem with a powered PCB.
ChadTower:
Add the jumper. It's just not worth the extra time involved with guessing.
Of course, in something that small and SMD, I would probably just get the part number off the PCB and head to ebay. There is a good market for used TV PCBs given how many of these TVs fail prematurely.
SavannahLion:
--- Quote from: ChadTower on December 29, 2010, 05:55:14 pm ---
Add the jumper. It's just not worth the extra time involved with guessing.
--- End quote ---
My question was, do I need to ensure the trace is completely severed or do I just leave it?
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