My TV will power up and then click back off like someone hit the power switch. I can keep turning it off and on and eventually it will come on and stay on for anywhere from 5-25 minutes and then will click off again. When on, the picture and sound are fine.
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Re: Tv Powers up and immediately back off
This model is equipped with a self-diagnosis feature to help with diagnosis of shutdown problems. To activate this turn the unit on let it shutdown then press the input and menu buttons on the front panel simultaneously and hold them in for 5 seconds after 5 seconds the power LED on the front panel will blink a two digit sequence. This will be one set of blinks a short pause then another set of blinks, this will repeat 5 times. 1 - 2 = no error detected 2 - 1 = X-ray protect (high voltage or beam current) 2 - 2 = Short protect (short protect monitors low voltage supplies) 2 - 3 = Deflection protect (this could be loss of vertical or horizontal deflection) 2 - 4 = Vertical protect (usually loss of vertical from the source) 1. Shutdown at power with self diagnosis error 2-2. Check for open fuses F9A04 and F9A05 part # 283P144080 on the +24 and -24 volt lines. If the fuses are open the convergence output circuit would be suspect. 2. Shutdown at power with self diagnosis error 2-1. At power on check for 12-volts DC at connector KH pin 8, if missing check IC9C51 part # 270P990010 and L9C52 part # 441D009020 on the Signal PCB
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I have an LG as well. My troublshooing says: "Check the power control setting.The power supply may be interupted. Check if the Auto sleep feature is actiated in the Time settings. Refer to the " Sleep timer". If there is no signal while the TV is on, the TV will turn off automatically after 15 miutes or so"
Here's how to scan for TV codes on your DIRECTV remote
1.Make sure your TV is turned on.
2.Slide the mode switch at top of remote to "TV".
3.Press and hold the MUTE button. This is located above the number 1 button.
4.While still holding down MUTE, press and hold the SELECT button until green light at the top of the remote flashes twice.
5.Then enter 991, the green light on remote should flash twice.
5b. Press 1 again (it will flash twice
again), then you press the power on button at the very top right.
6.Point remote at TV and press CHANNEL UP button. Tap the CHANNEL UP button repeatedly until the TV powers off.
*If you hit channel up very fast, you risk going past the code. Pressing
channel down will back it up. I alway hit channel up very fast till the
tv turns off, then back it up slowly till it comes back on.
7.When the TV powers off, press and release the SELECT button.
*Note: If the green light flashes three times before TV responds, then
all codes have been cycled through. Our remote controls are guaranteed
to program to your DIRECTV receiver, however your TV may not be
compatible with our remote control.
The power light may be flashing or if you are runing with a series light bulb it may be cycling on and off continuously. There may be a chirping or clicking sound from inside the set. (Note: using too small a series light bulb load during testing for the size of the TV may also result in this condition.)
If there is a low voltage regulator or separate switching supply, it could be cycling on and off if the horizontal output, flyback, or one of its secondary loads were defective.
Does this TV have a separate low voltage regulator and/or switching power supply or is it all part of the flyback circuit? For the following, I assume it is all in one (most common).
Some simple things to try first:
Verify that the main filter capacitor is doing its job. Excessive ripple on the rectified line voltage bus can cause various forms of shutdown behavior. An easy test is to jumper across the capacitor with one of at least equal voltage rating and similar capacitance (make connections with power off!).
Use a Variac, if possible, to bring up the input voltage slowly and see if the TV works at any point without shutting down. If it does, this could be an indication of X-ray protection circuit kicking in, though this will usually latch and keep the set shut off if excessive High Voltage were detected.
1. Press and hold the TV key. 2. While holding down the TV key, press OK. 3. Release both keys. The Device Keys will blink twice. Ideally we do not have code for coby TV. So we need to manually program the remote TV and Cable box should be both powered on. 4. Press 9 - 2 - 2. 5. Point the remote at the TV.6. Press PLAY Press FAST-FORWARD. Every time you press FF the remote sends out a new power-off command to the TV. Keep pressing FF until the TV turns off. (You can press REWIND to go back 1 code.) 8. When the TV turns off, you have found the right code. Press OK to store this code. 9. Press TV and the power should go on. You will now have volume control also. TIP: Press ff slowly so you know when it powers off and when you need to save the code by hitting OK after it powers off.
Try it without a code. Turn your tv off. Press tv then press the on.off button and tv button at the same time. When it lights up, press play every five seconds until the tv powers off. Next press the reverse button every few seconds (sometimes takes a while), until it powers back on. When it powers back on hit the stop button to save the code.
Have you tried to click the source button on the tv? It is the second button from the bottom on the right hand side of the screen.
I doubt your tv/monitor is turning off, it just isn't getting any input. D-Sub is the "pc monitor part".
Try clicking that button, give it sec, the hit it again. It will go through all of it inputs. If TV is what you are trying to find, it is directly after the Video input (green letters, top right hand side of the screen.) Keep hitting the button until TV shows up.