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Lg tv cf20d30 goes to standby mode intermittently every 30 to 60 secs after switching on.

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  • Anonymous Mar 16, 2014

    lg tv cf20d30 goes to standby mode when i switching it on it never show a pic but turns to standby mode again.

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Most likely there are some parts that have become thermo sensitive with age. Many times electrolytic capacitors become thermo sensitive as they ware down.

The parts that are going out of spec are probably causing some kind of fault that the set's uPC sees as a fault and puts the set in to protection.

The service tech will use a heat gun and liquid air also known as "freeze spray" to cool and heat the suspect components to trigger the fault, and then reverse it. Once the parts are found, they can be changed.

Jerry G.

Posted on Apr 27, 2008

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2 Answers

I have LG 21 COLOR FLAT TV MODEL J4RGE3AZ. THE PROBLEM IN MY TV IS THAT WHEN MADE ON IT GOES TO STANDBY MODE AFTER 7 TO 8 SEC. PLZ HELP ME TO RECTIFY THE PROBLEM PLEASE.


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Type in the brand name of your device, in the search box [at the top right] of the display window, and press enter to get all related posts. It will make surf easy.

Feb 05, 2015 | LG Standard (CRT) Televisions

1 Answer

When I turn the set on green leds appear for about 30 sec then it swicthes to red stanby and flashes 5 times intermitently


Hi,

May I know what is the exact model number of your TV, it is located at the rear cover, manual, and on the receipt. It will help diagnose accurately where the fault came from and confirm the blinking error code.

Jdvillanueva

Jan 11, 2012 | Standard (CRT) Televisions

2 Answers

Switches on then goes back to standby mode.initially it would show a the picture pressed vertically


problem on three things.
1.power supply: some of components may be damage,such as,EHT transformer ,Capacitor,diode Mos fat ,
2. Video card
3. If it self check thoroughly or not go to work shop.

Feb 12, 2010 | LG RU-27FB30C TV

1 Answer

TV, KV-TF21M80 TURN JUST A SEC AND BACK TO STANDBY


try to pull out first the vertical IC, then switch ON the TV,If the Tv is On it may be the Vertical IC problem change it. If Still the same before pulling out the V IC. check the low voltage side for any diode leak.

Sep 06, 2009 | Standard (CRT) Televisions

2 Answers

I pressed the sleep button by accident and the pic and sound went off and the stand by/timer red light started blinking. what does it mean?


Depends on how many times it blinks,just count the blinks Example: if it blink 2 times then pauses and blink 5 times then the code would be 25 and so on

Once you have this code,please post it.

Jul 30, 2009 | Sony KV-32S40 32" TV

2 Answers

Problem sony tv kv2197 go on standby.when power on a few sec tv on and go to standby mode. pls help me


You may try resetting the TV to the original factory settings. If the issue persists then service will be required.

Jun 19, 2009 | Sony Standard (CRT) Televisions

1 Answer

Standby mode intermittently.


Hello, FixYa

I have normal tv model CNT 2588 code 981, remote control was out of order and I tried to buy a new one from many places in UAE, Suadi Arabia & Egypt but I failed due to it is old model and no spare parts. So I use the tv function through Satel Decoder and use tv main power button for swithing on and off. It seems that caused a problem and tv now could not get power to switch on. Would you e-mail me with the repair manual including the Elect.Circuit to try to repair the problem. Also if you can arrange to send me a new remote control model CNT 2588 code 980. Since the TV Picture and sound are still in an excellant condition, please e-mail me you kind response with the cost if any to send you my Address and money.

Thanks in advanced.

Mohamed Said

Oct 30, 2008 | Standard (CRT) Televisions

1 Answer

Getting out of standby mode


That blinks and flashing have a diagnostic code;

Here is a list of the problems that might have occurred indicated by the number of blinks. The words in parentheses are those, which you will see for each of these faults on a diagnosis screen described later in this article.
  • Unit is dead, No blinks - Problem in the standby power section. Might check fuse, R607, Q601, IC601, R612 and VDR601 (should show open).
  • Continuous blink once a second, no pausing - No reply from the jungle IC301 (data bus is busy, shorted to ground, or held high), IK video path is defective.
  • One blink - not used for the self-diagnosis
  • Two blinks - B+ over current protection (OCP), unit goes to the standby mode then displays the 2 blink fault. Could be a short in the power supply of any of the circuits.
  • Three blinks - B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is also a problem in the power supply circuit, check T603 and R672.
  • Four blinks - No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted. Check IC1509, Q1505
  • Five blinks - AKB circuit (automatic kine bias), the timer/standby indicator blinks for about 30 seconds then goes to the self-diagnosis function. Something is wrong with the video. Check video out, Q705, 732, 761 and other components on the C board, also check Q218, 219, 220 on the A board. In addition, unit could be in IK blanking, try turning up screen slightly.
  • Six blinks - No Horizontal (H STOP), no raster, goes to the blinking self-diagnosis function immediately. Check C515 & 516 and the jungle IC, IC206.
  • Seven blinks - High voltage shutdown. The high voltage has exceeded 33k and the unit goes immediately into safety shutdown. Check power supply regulation and horizontal circuits.
  • Eight blinks - Problem with the audio (AUDIO), unit goes to standby and blinks the self-diagnosis code. Check IC406 audio amp, PS401, and 402. On some projection models of Sony TV sets, this code means that T8005 (flyback transformer), or the associative components in the high voltage circuits are defective on the D board.
  • Nine blinks - Replace D 6116 and D 6301 on the "G" board, do not resolder as this will fix the problem temporary. Or Panel Module Error or Thermal Error. If it is intermittent 9 blinks, meaning sometimes the TV comes on and other times you get flashing, then change the switching regulator on the "G" board or check connections. Make sure the regulator is -12 or -13 (negitive).
  • Ten blinks - Check Q8014 and Q8013 for shorts, leakage, or bad solder connections on the " D" board. If the transistors are bad, check R8051 and IC8005, also on the "D" board.
Intermittent problems? This is a great feature. You can also bring up these fault codes on-screen to see a list of the problem numbers with the abbreviation of the problem and the number of times this problem has occurred. This is slightly different than entering the service mode. To see the diagnostic screen, press the following buttons: Display, Channel, 5, volume Minus, ( not plus ) then Power. This brings up a screen with a list of the problems and number of times they have occurred. Each of the problems named, are abbreviated as, "OCP", "OVP", "V STOP", ETC. We have repeated them in parentheses in the text for the "Blinks" described above so you can correlate between the diagnostic screen and the blink codes.
Now that you know about these self-diagnostics, how do you use them? Say that you have a set with a black screen. You see that the LED is blinking four times. This would tell you that you have no vertical sweep, which is why the video is muted. If it was blinking 6 times, you would know that you have a horizontal fault. It's not a sure cure..
IMPORTANT: After you repair the unit, you MUST clear the values on this diagnostic screen. These codes do not reset themselves after the fault is corrected, so if you don't clear them, you'll be seeing "old" fault codes the next time you enter this screen. Clearing is done by going into the service mode (display, channel, 5, volume plus, then power ). Press 8 and Enter, which returns everything to the factory preset condition.

Hope it may help you;

Regards,
VOTIT

Aug 19, 2008 | Sony FD Trinitron WEGA KV-36HS500 36" TV

1 Answer

'standby' mode and akb error number


AKB 66 in self diagnostic test means...TV goes to standby (shut-off) for AKB problem 66 times. AKB is White-Balance signal and it is not proper or maintained in your TV. So error signal produced and TV goes to shut-down state.
Regardnig Standby button, its available on remote only. If you push TV Power switch, TV will switch ON, push it again to OFF TV. Power Button on remote set TV in standby status and you dont need to push power button of TV itself.

Aug 14, 2008 | Sony KP-53HS10 TV

1 Answer

Panasonic colour tv TX-29P150X (Made in Malysia)


sounds like you have a intermittant thermal condition and this could be the regulator IC the video jungle/sweep Ic. Anything in the switching poewer supply or sweep curcuit. This is a hard one unless your there with a meter and a schematic to measure voltages when the set goes out then you can use a can of freez sprasy to lightly spray on the supected part. Sorry i cant be of more help. Good Luck

May 17, 2006 | Panasonic TX-32PM1 32" TV

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