Re: Sharp LC-40LE810UN Zero Power
I now have another issue. The front panel buttons do not seem to be working, but the standby light works.
xoicorez
Member
Last Activity: 05-09-2021, 01:19 PM
Joined: 04-30-2021
Location: Toronto
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Last edited by xoicorez; 05-03-2021, 10:51 PM. -
Re: Sharp LC-40LE810UN Zero Power
So I went ahead and replaced the Cosmo 817 on PC7703 with PC817CN and the TV now works.
Thank you everyone for their efforts!Leave a comment:
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Re: Sharp LC-40LE810UN Zero Power
With PL disconnected, UR13.2 drops to zero from 12.5 and 8.5 for each respective pin.
BU5V is up and there is 13.2V on C7962a with PL disconnected....Leave a comment:
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Re: Sharp LC-40LE810UN Zero Power
Thanks for the info! Does anyone know if [URL="https://datasheet.lcsc.com/lcsc/1912111437_Lite-On-LTV-817-CN_C343983.pdf"]817CN [/URL]work?
Pin 1 - -16 then drops to -1
Pin 2 - -1Re: Sharp LC-40LE810UN Zero Power
Thanks for the info! Does anyone know if [URL="https://datasheet.lcsc.com/lcsc/1912111437_Lite-On-LTV-817-CN_C343983.pdf"]817CN [/URL]work?
Pin 1 - -16 then drops to -1
Pin 2 - -1Re: Sharp LC-40LE810UN...Last edited by xoicorez; 05-02-2021, 01:32 PM.Leave a comment:
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Re: Sharp LC-40LE810UN Zero Power
The service manual is attached on the first post.
Here is a link to a clearer image of the board:
[url]https://i.imgur.com/NT7q0so.jpg[/url]Re: Sharp LC-40LE810UN Zero Power<br...q0so.jpg[/url]...Last edited by xoicorez; 05-01-2021, 09:54 PM.Leave a comment:
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Re: Sharp LC-40LE810UN Zero Power
Do you mean LB STB? That is 0 with power plugged in while pressing power button.
For PC7703 plugged into outlet,
3 - 0.01
4 - 0
PC7901 3&4 is -1
PC7702 3&4 is -1
PC7701 3&4 is -1...Leave a comment:
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Re: Sharp LC-40LE810UN Zero Power
The CTR marking on my board isn't on the PDF for some reason.
...Leave a comment:
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Re: Sharp LC-40LE810UN Zero Power
The CTR marking on the opto is H, I believe. It's the bottom letter.
Do you suspect the opto is the issue with those readings on PD?...Leave a comment:
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Re: Sharp LC-40LE810UN Zero Power
Yes, that is correct. When I press the power button when it is plugged into the AC outlet, UR13V jumps to 12.5 but drops to 0. PNL-POW maintains 0.12 then drops to 0.09 when power button is pressed, but goes back to 0.12.
I measured AC_DET again and it is always at 0....Leave a comment:
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Re: Sharp LC-40LE810UN Zero Power
I am now reading the old thread and understanding it more. I think I need to replace the optocouplers, PC7703?
Would this [URL="https://www.ebay.ca/itm/363309600212"]work[/URL]?
They are PC817C but the optocouplers on my board are Cosmo PC817H. They have different CTR based on this [URL="www.cosmo-ic.com/object/products/K1010.pdf"]PDF[/URL]?
Re: Sharp LC-40LE810UN Zero Power
I am now reading the old thread and understanding it more. I think I need to replace the optocouplers,Leave a comment:
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Re: Sharp LC-40LE810UN Zero Power
Sorry, the measurements were incorrect since I didn't connect PD.
UR13V - 12.5 to 0
AC_DET - 0
PS-ON - 2 to 0
PNL-POW - 0.09 to 0.12...Last edited by xoicorez; 05-01-2021, 02:22 PM.Leave a comment:
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Re: Sharp LC-40LE810UN Zero Power
The voltages do not change....Leave a comment:
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Re: Sharp LC-40LE810UN Zero Power
.Last edited by xoicorez; 05-01-2021, 02:12 PM.Leave a comment:
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Re: Sharp LC-40LE810UN Zero Power
There is only 12 pins on PD?
...Last edited by xoicorez; 05-01-2021, 01:59 PM.Leave a comment:
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Re: Sharp LC-40LE810UN Zero Power
Pin 1 - 1 going down to 0
Pin 2 to 10 - 0
Pin 11 - 4.9
Pin 12 0.1Last edited by xoicorez; 04-30-2021, 03:26 PM.Leave a comment:
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Re: Sharp LC-40LE810UN Zero Power
I'm not sure which connector that is? Is it PD?Leave a comment:
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Sharp LC-40LE810UN Zero Power
After reading the existing threads on here, I'm still not sure where the problem is exactly. There is no backlight and no standby light when it is plugged in. I don't have much experience working with electronics on this level.
Based on the previous threads ([URL="https://www.badcaps.net/forum/showthread.php?t=72543"]1[/URL] , [URL="https://www.badcaps.net/forum/showthread.php?t=22299"]2[/URL]) , I've measured these items on the board:
After reading the existing threads on here, I'm still not sure where the problem is exactly. There is...Last edited by xoicorez; 04-30-2021, 01:35 PM. -
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