Possible nav fix
08-14-11, 04:11 PM
#1
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Possible nav fix
Yes my touhscreen went dead too. I searched for fix and finally I saw this on the other site
http://us.lexusownersclub.com/forums...howtopic=69937
"If your Lexus has the same manufacturing defect as mine, and you're patient/mechanically inclined, you may be able to fix it for CHEAP. As in under $50 cheap.
The culprit for this problem was a faulty connector on the touch panel. The touch panel is a 4-wire resistive panel, taped to the LCD display. The unit is made by Toshiba. There's a four wire ribbon cable that is improperly bonded to the touch panel. Sunday had been a hot day here, and upon further mental digging, my wife recalled hitting a pothole a few days before. Shock + thermal-expansion + manufacturing defect = dead nav unit = unreasonably costly expense with normal consumer operation. In my opinion Lexus should really fix this...
Unhook the 4-wire ribbon connector and you're ready to troubleshoot. Labor at this point should be under an hour if things have gone smoothly, but realistically two hours.
Here's where you need a good set of test probes for your multimeter - I found a set that worked perfectly at Radio Shack for about $20 - including lots of cool micro probes, clips, needles, etc. I couldn't have made the repair without these. Also, while there, pick up a silver CircuitWriter pen for about $11. That's what I used to repair the trace.
The resistance between pins 1 and 3, and 2 and 4 should be about 500 and 1700 ohms. The resistance between the other pairs of pins, say 1/2 or 1/4, or 3/4 should be infinite until the panel is touched. When touched the resistance between those should go to something under 2k ohms. From this info you can figure out which connector is faulty. In my case the connector failed right where the two pieces of glass are sandwiched together, and by using the needle probe, I was able to get a good resistance measurement on the touch panel by wedging the needle of the probe up into the crack where the two pieces of glass join. I found a bit of live connector. So then I took a razor blade and scratched off the coating on the ribbon connector, right up to the glass, and applied some of the CircuitWriter ink there. Note that it has to dry before it's conductive. When it does dry, the panel is repaired. Seal that back up, put it together, and everything's done."
I was thinking of trying this if lexus corporate denies my claim. This fix looks simple enough. Has anyone else tried this?
I have also tried looking for a new digitizer but have been unsucessful. If anyone knows where to get the replacement digitizer please let me know.
http://us.lexusownersclub.com/forums...howtopic=69937
"If your Lexus has the same manufacturing defect as mine, and you're patient/mechanically inclined, you may be able to fix it for CHEAP. As in under $50 cheap.
The culprit for this problem was a faulty connector on the touch panel. The touch panel is a 4-wire resistive panel, taped to the LCD display. The unit is made by Toshiba. There's a four wire ribbon cable that is improperly bonded to the touch panel. Sunday had been a hot day here, and upon further mental digging, my wife recalled hitting a pothole a few days before. Shock + thermal-expansion + manufacturing defect = dead nav unit = unreasonably costly expense with normal consumer operation. In my opinion Lexus should really fix this...
Unhook the 4-wire ribbon connector and you're ready to troubleshoot. Labor at this point should be under an hour if things have gone smoothly, but realistically two hours.
Here's where you need a good set of test probes for your multimeter - I found a set that worked perfectly at Radio Shack for about $20 - including lots of cool micro probes, clips, needles, etc. I couldn't have made the repair without these. Also, while there, pick up a silver CircuitWriter pen for about $11. That's what I used to repair the trace.
The resistance between pins 1 and 3, and 2 and 4 should be about 500 and 1700 ohms. The resistance between the other pairs of pins, say 1/2 or 1/4, or 3/4 should be infinite until the panel is touched. When touched the resistance between those should go to something under 2k ohms. From this info you can figure out which connector is faulty. In my case the connector failed right where the two pieces of glass are sandwiched together, and by using the needle probe, I was able to get a good resistance measurement on the touch panel by wedging the needle of the probe up into the crack where the two pieces of glass join. I found a bit of live connector. So then I took a razor blade and scratched off the coating on the ribbon connector, right up to the glass, and applied some of the CircuitWriter ink there. Note that it has to dry before it's conductive. When it does dry, the panel is repaired. Seal that back up, put it together, and everything's done."
I was thinking of trying this if lexus corporate denies my claim. This fix looks simple enough. Has anyone else tried this?
I have also tried looking for a new digitizer but have been unsucessful. If anyone knows where to get the replacement digitizer please let me know.
08-16-11, 06:01 AM
#7
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Saw this on the owners forum. Much cheaper fix obviously, but what I'm wondering is if this diagnosis is the most common for the nav screen outage, or just one occurrence.
Hopefully some people that have had this problem now look to find out and post up.
Hopefully some people that have had this problem now look to find out and post up.
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08-16-11, 06:06 AM
#8
Im thinking it will be OK to just recircuit all four connections: Do one and a month later I dont want to be tearing apart my dash again.... Does anyone see problems doing that>?
