Can anyone please tell me what the hidden service code is for a Sharp Aquos 3D Quattron (LC-60LE835U) is and how to access. TIA

Yes, it does exist!

Support Details LC-46LE832U - Sharp Electronics

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Home > Support > LC-46LE832U. LC-46LE832U AQUOS QUATTRON LED LCD TV ... Have a basic question about your Sharp product? Get started with the ...

LC-40LE832U ' LC-46LE832U ' LC-52LE832U ' LC ...

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PDF Consult the dealer or an experienced radio/TV technician for help. DECLARATION OF CONFORMITY: SHARP LIQUID CRYSTAL TELEVISION, MODEL LC- ...

AQUOS LC-46LE832U LED-LCD TV-LC46LE832U ' Eckley ...

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On the LC-46LE832U, this technology is enhanced further with Quad Pixel Plus, which produces smoother lines by enabling the individual control of all 8-million ...

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Sharp LC-46LE832U Pdf User Manuals. View online or download Sharp LC-46LE832U Operation Manual, Connection ... LIQUID CRYSTAL TELEVISION.

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Seems like main board fault. Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

If your LCD TV or monitor has stopped working, or is displaying one of the following symptoms, then it's a candidate for some new capacitors
- Flickering screen
- Screen image disappears after several seconds
- Dim screen
- Slow start
- Power LED on, but no picture
- Unusual colors and/or lines
The primary cause of LCD TV and monitor failure is caused by faulty capacitors. You can examine the capacitors in your LCD TV or monitor and actually see if they are bad.
If they appear bulged on top, then they need to be replaced.
New capacitors will solve a host of problems in LCD monitors and TV's and will extend the life of your monitor or TV by several years.
Check the cables, connectors and connections.
Take it to a repair shop.

Follow as per attached file.

Contact the authorized service center for sharp.
Gopakumar Gopalan Google

You need to reboot the tv. you've had a signal drop which locks up the tv. call sharp tech support and they will talk you through a reboot.

Refer its user manual for more details. It will have the default reset code.

Eh, I can't be too sure, but it sounds like it's either a heat issue, a signal issue, or a backlight issue. Either way, if it's still under warranty I'd send it in.