Working on this unit, I have check voltage to main board and are getting the 13 & 3 volts. I have check voltage to t con board and get 12v on first 2 and zero on last 2 pins. The unit does power on and has backlight but no Video or sound. I was just getting backlight but I have messed with ribbon cables on t con board and now I get some red lines on left side of screen.
sharp lc-60le640u
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Re: sharp lc-60le640u
Replaced t-con for no change except to clear up the red line I caused, back to backlight but nothing else. I got some more reading from top of powerboard.
1- 12.1v. PNL 12v
3- -.009 GND
5- 13.1v UR 13.2v
7- 13.1v. UR 13.2v
9- .010. GND
11- .010. GND
13- 3.31v. AC_DET
15- 5.04v. BU 5v
17- 1.15v. PWM1
19- 1.3v. Dimmer
21- 1.15v. OFL
23- .000v. PWM2
Any suggestions from that, I can check the readings on the bottom if needed. I am not sure about 17 and 23. ThanksComment
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Re: sharp lc-60le640u
Tcon is good. Panel is good. Sharp will fail if tcon cables are messed with while powered up. That's probably what happened. I suspect mainboard. Try heating up the mainboard with a hairdryer. probably bad bga under processor.Did I leave the soldering iron on?Comment
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Re: sharp lc-60le640u
somewhat expected (white).... is the white uniform when seen on both sides?
based on the card changes that you did so far, my guess would be a problem between the tcon and panel, potentially a smd component on the panel boards.
tracing the voltages from / at the tcon (labelled) and following those to the edge board might help.Comment
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Re: sharp lc-60le640u
no problem... yes indeed they look ok. This appears to show that the panel itself is not a direct problem. However, some how the panel is not being driven.... either no signal or some operating voltage is not getting to the panel. Check the voltages on the tcon.Comment
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Re: sharp lc-60le640u
See if you have voltage on each side of tcon fuse, negative meter lead on a ground.Comment
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Re: sharp lc-60le640u
alas, you picture doesn't show any TPs unlike others... maybe the other side?Last edited by budwich; 02-19-2019, 07:31 PM.Comment
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