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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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what is the best way to go about fixing a bad LCD led segment
Hello! I have a small handy talky radio that has a bad LCD segment. Does anyone have any starting points / tips / pointers for repairing the segmented LCD displays, or know how they ussually break. -Thanks! |
#2
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what is the best way to go about fixing a bad LCD led segment
Eric Lada writes:
I have a small handy talky radio that has a bad LCD segment. Does anyone have any starting points / tips / pointers for repairing the segmented LCD displays, or know how they ussually break. Bad connections. For an LCD, probably just need to clean the Zebra stripe elastomer pads going to the LCD panel. Else, may be bad solder connections. The driver chip could be bad but that's a lot less likely. --- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#3
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what is the best way to go about fixing a bad LCD led segment
"Eric Lada" . wrote in message I have a small handy talky radio that has a bad LCD segment. Does anyone have any starting points / tips / pointers for repairing the segmented LCD displays, or know how they ussually break. Repair is not for the faint hearted, but: Over the period of quite a few years, the most common segment failure I've encountered has been a failed connection right at the back of the LCD glass surface. I cannot become enthusiastic about telling anyone to try this, but it has worked for me probably a hundred times. There are several methods used to make the electrical connection to the glass surface. One that is easiest to repair is the one that uses a conductive rubberlike strip sandwiched between the display driver part of the PCB and the LCD's rear glass surface. For some reason, the actual electrical resistance between this rubberlike strip and the glass becomes too high. It is quite often corrected by a simple cleaning of the glass, rubberlike strip and the PCB lands the strip touches. My best luck cleaning has been with a "Q-Tip" slightly moistened with very high percentage pure alcohol. Beer or vodka are not good choices. All that secret technical information above is only useful if you are able to disassemble the LCD's mounting assembly and get it back together successfully. Manufacturers have not made this easy in most cases, and success or failure will most likely depend on someone's ability to carefully disassemble and reassemble the little bugger. If you have a tendency to drop small screws, or sneeze while working, maybe just living with the missing segment is best. Old Chief Lynn |
#4
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what is the best way to go about fixing a bad LCD led segment
Lynn Coffelt wrote:
"Eric Lada" . wrote in message I have a small handy talky radio that has a bad LCD segment. Does anyone have any starting points / tips / pointers for repairing the segmented LCD displays, or know how they ussually break. Repair is not for the faint hearted, but: Over the period of quite a few years, the most common segment failure I've encountered has been a failed connection right at the back of the LCD glass surface. I cannot become enthusiastic about telling anyone to try this, but it has worked for me probably a hundred times. There are several methods used to make the electrical connection to the glass surface. One that is easiest to repair is the one that uses a conductive rubberlike strip sandwiched between the display driver part of the PCB and the LCD's rear glass surface. For some reason, the actual electrical resistance between this rubberlike strip and the glass becomes too high. It is quite often corrected by a simple cleaning of the glass, rubberlike strip and the PCB lands the strip touches. My best luck cleaning has been with a "Q-Tip" slightly moistened with very high percentage pure alcohol. Beer or vodka are not good choices. All that secret technical information above is only useful if you are able to disassemble the LCD's mounting assembly and get it back together successfully. Manufacturers have not made this easy in most cases, and success or failure will most likely depend on someone's ability to carefully disassemble and reassemble the little bugger. If you have a tendency to drop small screws, or sneeze while working, maybe just living with the missing segment is best. Old Chief Lynn I've done some repairs as you describe; but my old Nokia 51xx/61xx series phones had a similar problem that was much easier to repair. The display--the entire unit--was simply a pressure fit in the case. With proper disassembly of the case, the whole thing would fall out of the phone, as it was only connected to the circuit board by spring pressure on the contacts. Many of those phones (I had at least a dozen over time) were fixed by merely cleaning up the contacts on the board and LCD unit, and retweaking the springs. Hopefully the OP's unit could have something similar.... jak |
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