The lcd screen stays lit all the time even when closed. and there is an error saying sensor error.

Hi,
C2557: Abnormally low toner density detected black TCR sensor.
Detailed Error code explained below.
Possiable solutions.
* Open and close the front toner door.
* Restart the machine by turning off the LCD screen power switch, then by the main body switch located behind the access panel above tray 1 indicator light.
* Call Konica to get a tech out.
C2557 Abnormally low toner
density detected black
TCR sensor
• When sampling data is determined in TC
ratio calculation control, TCR sensor output
is higher than a predetermined value for a
predetermined number of times in a row
even though there is toner in the sub hopper.

When the following conditions, you need to replace the LCD screen:
No image on the screen, but the power indicator stays in
Dark display but still readable
Results - 1 of 1 / from by by 2 to a few seconds are of the the the the scintillator of the screen and Close for between the
The power indicator has been lit, but nothing display and sound
No image on the in the screen, but the LCD TV still comes with audio
Pictures cycle open and close the, as well as lamp closed for non high-power LED
http://www.lcdinverter.info/hp-pavilion-dv61247eo-lcd-inverter-p-11136.html

Try these procedures.

Usually the solution to this problem is to use a good penetrating oil and spray HEAVILY the latch mechanism (both doors), let it soak in, and open/close the door 15-20 times-the sensor is in the door and it gets hung up, spraying lubricant on the latches frees it up.

Must be a stuck keypad is all I can think of.

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

There are 4 steps to fix this:

1. Simultaneously press and release "small mug" and "medium mug". Immediately afterward press "menu" 3 times. (Menu is the black button under the display screen.) You should see a time 6:09 on your screen.

2. Press "menu" once. Your LCD screen should say Brew 0:00.

3. (I messed this step up like 10 times and had to unplug the machine, then replug it and start over at step one. You have to unplug if the LCD displays "auto ____". If it continues to flash "Not Ready" and "Brew" then you can just keep trying step 3). Press and hold "medium mug". While holding "medium mug" press and release "menu". Immediately after pressing "menu" (while still holding "medium mug") press "small mug". Release "small mug" and "medium mug" at the same time. This entire thing needs to be done very quickly. as soon as you release "menu" go to "small mug" and release both buttons quickly.

4. Unplug the machine (do not turn it off). Wait for 3 seconds or so. Plug it back in, turn it on and follow the instructions for priming.

I think your battery might not be shorting out the lcd.

Leave the battery out and see if the lcd stays lit without going black, if it does it probably is the battery thats bad.

Try a known good working battery and see if the lcd stays lit. If the lcd stays lit then you know the battery was bad. if you get the same symptoms from another battery then you know its something with the motherboard at that point.

You can always lock the screen by clickign the lock icon on the back ground.  * then the green will unlock it as long as no password has been inputted.

is the backlight staying lit even with the picture out? I had the same problem with my Aquos LC32DA5U my backlight was always on but no picture at all, just a lit up black screen, the problem is the LCD controller, I replaced that and it's perfect now.

you curcuit board needs replacing it sounds like it has loads of errors , try a reflash of the firmware or take it to a mobile service center and have them diagnose the board and reflash it for you.

HEST - replace the ear piece on the phone