Question about Friedrich QuietMaster Electronic SS12J10AR Air Conditioner

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Model SM14J10B-1. Put back in window after winter; plugged it in; nothing. On/Off doesn't work. Shows F4 in display when plugged in,

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Could you please confirm that it is showing F4, Errors on Friedrich Air Conditioners are E*.

F4 would normally relate the the Fan Speed as High, can you try and change the Fan Speed.

Posted on May 27, 2011

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Posted on Jan 02, 2017

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I have an LG laptop model LGT1. it doesn't start up windows. the computer is on electricity is ok but nothing on the monitor. i tried an external monitor, and it also didn't tern on. the fan starts...


First, I would recommend you bring the laptop in a well-lit room, try to power it on, look closely at the screen and tilt it back and forth. You may see a dark image of what you're supposed to see, and, if so, that means your laptop's back light is out. If you still see nothing, try to attach the external monitor and power cycle the laptop a few times and try to hit the LCD/CRT button, which is usually (Fn + F4). If you still can't get any display, there is likely something wrong with the laptop's motherboard, which is often an expensive repair. It is usually more sensible just to replace the laptop than attempt to have it repaired.

Aug 27, 2011 | Computers & Internet

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The unit will not turn on after trying the pushing the power button. The green light on the reset button shows that it is on but on the display not lights are on. I tried to inplug and wait and plug the...


You need to bypass the on/off switch by jumping it, thereby taking the switch out of the circuit. If it works you have a bad switch. If it doesn't you have a power to the switch problem. Do you have a multimeter and a wiring diagram for this unit?

Aug 02, 2011 | LG Heating & Cooling

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Hi ! i have dell vostro 1510 and which is not booting up. even the bios is not showing up. Black screen appears and the loading lights blinks for 4-5 times then nothing happens. Power button is glowing...


- try to plug an external monitor on your laptop
- if you can see a screen on the external monitor, then you have a faulty LCD
- if you don't see anything on the external monitor, then you have a faulty motherboard

Jul 04, 2011 | Computers & Internet

1 Answer

Hello, I have a vaio FZ 140 N/B, which was bought in USA 4 years ago. One day last week I put it on hibernate, then the next day I could not turn it on, either with A/C plug in or with battery. This is...


Hi dung27fme,

If you see power lights but nothing appears on the screen, it could be a "POST" (Power-on Self Test) problem or simply LCD problem.

Here are some steps that you can try. One of these may work on your case.

1. Remove the battery and the ac adapter then press the power button for at least 20 seconds to drain electric charges left from the system. (You may need to repeat this step to get it work.)

2. If above step doesn't work, try to plug in an external monitor and see if you get display from the external monitor. You may need to press the Fn + F4 or F5, depends on the key designed on the keyboard to toggle between displays.

3. If you get display from the external monitor, I'm sure your having problem with the LCD components. In this case, check and replace faulty LCD backlight, LCD cable or LCD inverter. The LCD inverter is often a culprit.

4. Try to reinsert the memory module/s (RAM) of the unit, try using one RAM at a time to see if it works. A faulty RAM will cause the laptop not to POST.

5. If reinserting the RAM doesn't help, most likely your motherboard needs to be replaced.

Hope this helps.

Jun 27, 2011 | Sony VGNFZ220E/B VAIO FZ Series Notebook

1 Answer

Lights come on, but blank screen


Hi estees823,

If you see power lights but nothing appears on the screen, it could be a "POST" (Power-on Self Test) problem or simply LCD problem.

Here are some steps that you can try.

1. Remove the battery and the ac adapter then press the power button for at least 20 seconds to drain electric charges left from the system. (You may need to repeat this step to get it work.)

2. If above step doesn't work, try to plug in an external monitor and see if you get display from the external monitor. You may need to press the Fn + F4 or F5, depends on the key designed on the keyboard to toggle between displays.

3. If you get display from the external monitor, I'm sure your having problem with the LCD components. In this case, check and replace faulty LCD backlight, LCD cable or LCD inverter. The LCD inverter is often a culprit.

4. Try to reinsert the memory module/s (RAM) of the unit, try using one RAM at a time to see if it works. A faulty RAM will cause the laptop not to POST.

5. If reinserting the RAM doesn't help, most likely your motherboard needs to be replaced.

Hope this helps.

Jun 20, 2011 | HP Pavilion dv9000z Notebook

1 Answer

Meron power pero ayaw mag on


Hi arcymiguel,

If you see power lights but nothing appears on the screen, it could be a "POST" (Power-on Self Test) problem or simply LCD problem.

Here are some steps that you can try.

1. Remove the battery and the ac adapter then press the power button for at least 20 seconds to drain electric charges left from the system. (You may need to repeat this step to get it work.)

2. If above step doesn't work, try to plug in an external monitor and see if you get display from the external monitor. You may need to press the Fn + F4 or F5, depends on the key designed on the keyboard to toggle between displays.

3. If you get display from the external monitor, I'm sure your having problem with the LCD components. In this case, check and replace faulty LCD backlight, LCD cable or LCD inverter. The LCD inverter is often a culprit.

4. Try to reinsert the memory module/s (RAM) of the unit, try using one RAM at a time to see if it works. A faulty RAM will cause the issue not to POST.

5. If reinserting the RAM doesn't help, most likely your motherboard needs to be replaced.

Hope this helps.

Jun 16, 2011 | ASUS Laptop with Intel Centrino Processor...

1 Answer

Toshiba Satellite laptop will not boot. Shows power from outlet and battery but no indicator light is present for the last two in the five light sequence.


Its an old trick that got my Dell laptop working
Unplug the laptop remove the battery press the power button,...nothing will happen, wait a few seconds put battery back in laptop plug it in hold upside down press power button until it boots
If that doesn't work it could be a bad/loose/dead bios battery What is the model of the laptop?

May 11, 2011 | Toshiba Computers & Internet

2 Answers

Black Screen


Have you tried cycling all the way through the options with the F4? Most laptops toggle in a manner similar to: 1) Laptop only, 2) External display only, 3) Both displays, 4) Back to Laptop only (cycle repeats).

Jun 28, 2009 | Toshiba Satellite L300D-ST3501 Notebook

1 Answer

HP Compaq 2710p: External monitor does not display anything


Hi,

The display properties indicate the hardware is working, so it's likely just a setting.

On HP/Compaq models you will see a picture, usually on the F4 key that looks like a screen with two lines beside it.

You need to hold down the Fn key(bottom left) and then push the F4 key at the same time to cycle between LCD, external or both.
If it is a newer model, a menu will pop up when you do this asking if you want to duplicate the LCD on the external, switch to the external or extend the desktop onto the external. Select the appropriate setting or continue holding down Fn while pressing F4 to cycle between the settings to the one you want.

If you have re-installed the computer at some point with anything other than the factory recovery set this may not work and I will have to give you a longer set of instructions.

If this works please rate this as fixed, if not reply back and indicate what version of windows you're using and I will post the instructions for the "long" way.


Chris

May 26, 2009 | Compaq 2710p Tablet PC

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