Re: Sharp Aquos LC-60LE650U No Backlight 2 long 5 short
Thanks for everyone's help. The TV is up and running. Time will tell, but I have 9 extra parts if it happens again.
I know for a fact that the TV was enclosed in a wood bezel with no ventilation in a conference room and I wonder if that may have been part of the problem.
Thanks, again!
-Benjamin...
BenjaminJWD
Member
Last Activity: 05-17-2017, 09:58 PM
Joined: 04-29-2017
Location: Indiana
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Re: Sharp Aquos LC-60LE650U No Backlight 2 long 5 short
budm, you were dead on with the part. The heat sink was slightly more annoying than I thought it would be, but it is out and that was the correct part number. I've ordered 10 ($0.88 each) of them and I'll update once I have installed.
Thanks, everyone!
-Benjamin...Leave a comment:
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Re: Sharp Aquos LC-60LE650U No Backlight 2 long 5 short
Thank you for the link! I searched google so much for different part numbers, I didn't even think to search the forums. My bad.
Indeed. I usually order parts in 5s and 10s.
Pin 2 definitely is only supplying 7.34V, which it should be supplying 12V according to the board. I'll be pulling the heat sink and Q7120 tomorrow. I need to get a new wick. Once that is done, I should be able to verify.
Thank you, all!
Have a great...Leave a comment:
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Re: Sharp Aquos LC-60LE650U No Backlight 2 long 5 short
Pin 3 seems to be ground (-00.2V). It breaks out to the screw on the corner of the board and down the center of the board to other grounds. Pin 4 (2.709V) is not so easy to trace. It seems to be heading to PD-16 (PNL-POW).
Thanks!
-Benjamin
P.S. I just realized I have been saying PO when it should be PD for all of the pins above....Leave a comment:
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Re: Sharp Aquos LC-60LE650U No Backlight 2 long 5 short
Ok, I have attached two pictures that show what I believe to be the faulty voltage regulator. Is that what you were referring to with the q7120?
Is this an equivalent? [URL="http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/KA78R12CTU/?qs=ImUAniFuiZTjLYoMLQi2Ug%3D%3D&gclid=CjwKEAjwlpbIBRCx4eT8l9W26igSJAAuQ_HGt4jux6pqoRIEZwyd1hssq9iHI9hj_dmc-DZpJi5pwhoCUz7w_wcB"]Mouser Voltage Regulator[/URL]
Thanks!
-BenjaminRe: Sharp Aquos LC-60LE650U No...Leave a comment:
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Re: Sharp Aquos LC-60LE650U No Backlight 2 long 5 short
As an aside, I definitely do not know all of the terminology. I believe "isolate" has a specific definition in circuits that I may have just misused. Please forgive any misuse of terminology and just be blunt and let me know I'm saying something wrong.
I have done a lot of capacitor testing and replacements, to repair computer motherboards, dryers, HVAC, etc. I am learning how to troubleshoot bigger issues than a simple blown cap. However, I am definitely a hobbyist that is learning a new field....Leave a comment:
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Re: Sharp Aquos LC-60LE650U No Backlight 2 long 5 short
Yes. I traced the 7.3v to under the heatsink, but didn't have a small enough clip to isolate only one pin of the four. And yes, the 13.2 was on the same 4 pin...actually, I don't know what it is called. But it has 4 pins and is connected to the heatsink.
I'll try to isolate each pin's voltage when I get home.
Thank you for the guidance!
-Benjamin...Leave a comment:
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Re: Sharp Aquos LC-60LE650U No Backlight 2 long 5 short
There are 4 pins (PO-1,2 and PO-3,4) that go directly to the tcon. According to the board, PO-1,2 are supposed to be PNL12V. Everything I'm reading about this board says it should be 12v, but I can't trace back far enough to find the 12v on the board. I can find the 13.2 in various places and obviously the 5v, but not 12v.
I have tested at the power board, and the tcon. Both provide 7.34v.
One of my problems being my multimeter was not meant for connectors this small and I may...Leave a comment:
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Re: Sharp Aquos LC-60LE650U No Backlight 2 long 5 short
I also tested the voltage on the LED power. They were 1 - 83v.4, 2 - 86.0v, 3 - 85.0v, 4 - 83.4v (I measured with the connector disconnected at the positive pin (L1-1, L1-5, L1-9, L1-13) and at the capacitors. I don't know if this is useful as the Main Board is not kicking on the LEDs, but I thought I would add the information.
-BenjaminLeave a comment:
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Re: Sharp Aquos LC-60LE650U No Backlight 2 long 5 short
I disconnected each of the two ribbon cables one at a time and tested voltage. It stayed steady at 7.34v on each disconnect. When I disconnected all connectors to the entire tcon it went to 7.35v. Disconnecting the LED power changed nothing, as expected (just extra caution).
Thanks!
-Benjamin...Leave a comment:
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Sharp Aquos LC-60LE650U No Backlight 2 long 5 short
Hello,
I have been reading through a thread about another sharp that lead me to test quite a few different voltage outputs. I am reading 7.34 Volts from PO-1 and PO-2 (PNL12V). I just want to make sure I'm not crazy and that a bad power supply is probably what I'm dealing with.
I'm asking because I was a little surprised how steady at 7.34v DC the reading was for both PO-1 and PO-2. If anyone knows the specific diode, capacitor, etc, that could be causing this, I would much prefer to replace those rather than purchase a new power supply.
Also, I am... -
Re: New Members - please post your introductions here
Hello!
My name is Benjamin. I work as an IT consultant, but have been working with electronics for a long time. I have recently started learning about LED TV repair and have been reading this forum extensively for troubleshooting steps.
I look forward to talking more soon!Last edited by BenjaminJWD; 04-30-2017, 02:19 AM.Leave a comment:
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