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Only standby led is lighting power cense voltage available but no power ctl

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Posted on Jan 02, 2017

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SOURCE: WILL NOT POWER ON, STANDBY, LED, TIMER LIGHTS ARE BLINKING.

Check the capacitors on the power supply first. If any have domed tops or signs of leakage, replace them. I had two go bad on mine. Call electronics parts supply stores first as these are not your average capacitors.

Posted on Aug 18, 2009

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Lg 42ln5400 no power


Standby light voltage (3.3VDC) is generated from the main digital board. If there is no standby light, means this voltage is absent. Check it, Replace the main digital board, if needy. http://electronicshelponline.blogspot.com/

Feb 13, 2017 | LG Televison & Video

1 Answer

LED TV no picture, but sound. Did flashlight test and determined backlight is the problem. Power supply/inverter or bad LED?


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/

To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Jun 17, 2016 | Westinghouse Televison & Video

1 Answer

Sanyo TV turns on and works but standby light not working


Do you mean that the standby LED does not light up; but the set works fine? Of so, either the standby LED is damaged, or it do not get voltage [due to loose soldering or some other reason]. Anyway, the set works fine. Isn't it. It means that there is no other fault than this. Contact any service technician in this case; to find out the reason. Electro help

Dec 05, 2014 | Sanyo Televison & Video

1 Answer

My Sony Bravia HX8/46 will not turn on, I check all the power going to it and it all works. Is there something I can do?


Is the standby led on the front lit. If not likely the problem is with power supply. If the standby led is on does it go off when the power button is pressed? Does the led blink. If so count the blinks and get back. The power supply provides an standby voltage to the main board. If the standby led is lit then this voltage is present. When the power button is pressed the micro sends a turn on voltage to the power board. Normally the power supply will respond and all other voltages needed to operate the set will come up. if a component is shorted the micro will not turn on the power board and will usually give a failure code via the standby led.

May 31, 2013 | Televison & Video

1 Answer

Has power but does not turn on the red light in the front


Check the power board's output voltages. Check whether 5V output is there. It is the standby voltage. If this voltage is absent, the front LED will not light up, or the set will turn ON.

May 24, 2013 | Televison & Video

1 Answer

Dynex DX-24L150A11 won't turn on LED light is not on either


Sounds like you are missing your 5VDC standby voltage from the power supply. You either have a blown fuse or a defective power supply. Did this happen out of the blue or after a T-storm???

May 11, 2012 | Dynex DX-L42-10A 42 in. LCD TV

1 Answer

I turn on the power switch, led lights, fan run, but after few seconds it turn off and no display on the screen, as in blank/ no lights. so how can i fix may laptop...


your IL1 pc note is intermittent. it sometimes open and you can use it... in some brand usually the problem is corrupted bios. solution: do bios flashing or bios recovery.. i have that IL1 too and i can't still find ways to flash its bios due to no available file for IL1. what i did was i replaced motherboard..

Apr 12, 2011 | CTL IL1 Notebook

1 Answer

Hi My Hitachi is in standby mode (not turning on - only have red standby light on). I have visually checked capacitors on 3 main boards and none appear to have expanded. Any ideas please?


First thing to do is measure the output voltages of the power board. You're looking for the one that provides standby power, usually +5V or +3.4 V and in some rare cases other voltages.

Don't know what it is for your TV, but it will sure be available on the power board if you see the red LED there.

Next you look to see if upon pressing power the main board signals to the power board to turn itself fully on, i.e. start generating the rest of the supply voltages.

There's a pin on the power board's connectors that is labelled "PS_ON" or just "ON" or something similar.

It should raise to +3V or so when you press the ON button.

For an example of a simple power board see this:
http://blog.coppelltvrepair.com/2010/09/how-to-test-power-supply-r0804-0901.html

If you do not receive that signal then the problem is in the main board.
if you receive that signal, but the power board does not generate the additional voltages that it outputs to the other boards then the problem is in there.
And if it wakes up and provides those voltages but the TV is still dead then the problem is in the main board, which usually needs to be replaced.

Hope this helps. If it does do not forget to rate it :-)

if you need more help - supposedly paid though - feel free to contact us.

www.coppelltvrepair.com

Oct 18, 2010 | Hitachi 26LD6600 26 in. HD-Ready LCD...

1 Answer

Motherboard red light stay on and computer won't turn on. Any ideas on what the promblem might be?


First try shutting down you're system. Than turn the PS off at the rocker switch (Back of PS). Ground you're self by touching the the PS. Remove you're memory and re-seat it. Than boot the system.
Check the standby LED. See if it lights green.
Pull the cmos battery and check its voltage. Anything under 2.4 volts replace the battery. Normally the MB LED displays green. (Standby power).
This means the MB is maintaining / charging the cmos battery. If the battery can no longer maintain charge this will cause the MB LED to turn Red. Built into the mother board is a small switch. When the system is shut down the MB maintains power to the cmos. If the standby switch fails to function correctly the LED will turn Red. Lets hope the problem is the cmos battery. The internal switch can not be repaired.

Cheers'
Mike

Feb 02, 2010 | AOpen S651M (918EM10S50) Motherboard

1 Answer

I tried several different cards but no luck. Cards work ok on other computers.


5V Stand-By Indicator LED
The power supply will always supply a 5V standby voltage to your
motherboard so that it can power on via for example Wake On Lan
technology. This LED shows that your power supply is supplying
this standby voltage to your motherboard.n :D

You may need to replace your power supply, if the LED is flashing, it's not supplying the power the motherboard needs.

[JP-25]

1 2 3 4 5 6 7 8 9
. . . . . . . . .
. . . . . . . .
10 11 12 13 14 15 16 17 18


1] Power Led (+)
2] --
3] Power Led (-)
4] --
5] --
6] Speaker (+)
7] --
8] --
9] Speaker (-)
10] Reset switch
11] Reset switch
12] N/A
13] Power Switch
14] Power Switch
15] ACPI Led (+)
16] ACPI Led (-)
17] HDD Led (+)
18] HDD Led (-)


For future reference you can download your motherboard manual here:
(PDF) Soyo K7VKP2

May 09, 2009 | Computers & Internet

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