Sharp LC-60LE835U
Greetings all!
I picked up two (2) of these big screens from a friend who was getting ready to toss them out. They were used outdoors (but exposed to salt air and high humidity common in South Florida). According to him, one powered on, but could not display cable, hdmi, or component video. The other was just dead.
On external visual inspection, it was clear that salt corrosion had severely degraded all of the video inputs on the back of the units, so I figured that replacing the MBs would probably be the first action necessary to bring them back to life.
When I got them home, I attempted to power then up. Sure enough, one was dead, and the second, after some difficulty (and I'm still not sure how), came to life with a screen full of bluish white noise. I could not get it to respond to either the touch control panel, or the remote control. So for this one, I concluded that I probably had connector issue on the touch control board, IR control board or both.
I ordered boards (Encompass Parts in Atlanta, was reasonably priced and made quick deliveries), and began the with the disassembly of the powereable set.
Upon disassembly, I noted that their was indeed evidence of corrosion on the IR board connectors, and the touch sensitive control board. Ordered those parts as well (still waiting on the control board). But for the most part, the internals of TV looked to be in very good shape. I.E., no real evidence of corrosion except where a component was directly exposed to the environment.
I should add at this point that I removed the control board to clean it, and in the process, probably rendered it permanently inoperable. Apparently the sticky backing on the board which attaches to the back of the touch surface, enables the touch pressure to transfer to pads on the boards. (according to the service manual, "defoliating" the board requires its replacement.)
Anyway, I installed the MB, cleaned connectors as well as possible and powered up the unit. Surprise... I got nothing, not even the white noise with which I started. (BTW, cabinet back was not re-installed. Is that okay?). RC and touch pad does not seem to work, still.
I suspect that with the replacement of the MB, I need to perform a reset. And I will try the reset instructions on found in this forum this evening.
I also noted that I am only getting 5 volts from the PD connector (pin 15) from the PS board. Pin one should be outputting 12V, but is not.
Not certain if the touch control board is getting 5 Volts or not ( I think not). This board also provides power to the IR control board. So my worry is, if the touch control is not getting the Voltage it needs, then neither will the IR board. So how can I do a reset?
Another question, is it normal that the PS does not supply 12 volts when the set is in (as I've seen it called in this forum) Fake Sleep Mode? Do I have a PS problem now since I changed the MB?
Anyone have any ideas about "refoliating" the touch control pad board?
Thanks in advance
I
Greetings all!
I picked up two (2) of these big screens from a friend who was getting ready to toss them out. They were used outdoors (but exposed to salt air and high humidity common in South Florida). According to him, one powered on, but could not display cable, hdmi, or component video. The other was just dead.
On external visual inspection, it was clear that salt corrosion had severely degraded all of the video inputs on the back of the units, so I figured that replacing the MBs would probably be the first action necessary to bring them back to life.
When I got them home, I attempted to power then up. Sure enough, one was dead, and the second, after some difficulty (and I'm still not sure how), came to life with a screen full of bluish white noise. I could not get it to respond to either the touch control panel, or the remote control. So for this one, I concluded that I probably had connector issue on the touch control board, IR control board or both.
I ordered boards (Encompass Parts in Atlanta, was reasonably priced and made quick deliveries), and began the with the disassembly of the powereable set.
Upon disassembly, I noted that their was indeed evidence of corrosion on the IR board connectors, and the touch sensitive control board. Ordered those parts as well (still waiting on the control board). But for the most part, the internals of TV looked to be in very good shape. I.E., no real evidence of corrosion except where a component was directly exposed to the environment.
I should add at this point that I removed the control board to clean it, and in the process, probably rendered it permanently inoperable. Apparently the sticky backing on the board which attaches to the back of the touch surface, enables the touch pressure to transfer to pads on the boards. (according to the service manual, "defoliating" the board requires its replacement.)
Anyway, I installed the MB, cleaned connectors as well as possible and powered up the unit. Surprise... I got nothing, not even the white noise with which I started. (BTW, cabinet back was not re-installed. Is that okay?). RC and touch pad does not seem to work, still.
I suspect that with the replacement of the MB, I need to perform a reset. And I will try the reset instructions on found in this forum this evening.
I also noted that I am only getting 5 volts from the PD connector (pin 15) from the PS board. Pin one should be outputting 12V, but is not.
Not certain if the touch control board is getting 5 Volts or not ( I think not). This board also provides power to the IR control board. So my worry is, if the touch control is not getting the Voltage it needs, then neither will the IR board. So how can I do a reset?
Another question, is it normal that the PS does not supply 12 volts when the set is in (as I've seen it called in this forum) Fake Sleep Mode? Do I have a PS problem now since I changed the MB?
Anyone have any ideas about "refoliating" the touch control pad board?
Thanks in advance
I
if it work fixed many.
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