Question about LG 42LG50 42 in. LCD HDTV

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Tv turns on ok for 5 seconds then picture goes blank then recovers after ten minutes

Replaced suspect capacitors on power board

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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://electronicshelponline.blogspot.com/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should troubles shoot. Contact any service technician. The circuit will differ with models and versions.

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1 Answer

Falt screen tv has a white screen when I turn it on,audio ok,picture comes on after about 20 minutes,any ideas?


Good day!!!




That problem is usually cause of faulty capacitors on the power supply board..


Just follow this instruction to fix your TV..


1. Open the back cover of your TV.
2. Look at the power supply board..Its normally connected to the power cord..
3. After that,,try to look at the actual image of capacitors if it is bulged on the top so that you can easily determine the bad capacitors..
4. After that,,try to replaced the bad capacitors using soldering iron and soldering lead..replaced the capacitors only with the same type ratings and value..
5. Some of the capacitors not bulged so its better if have a capacitance meter

Jul 18, 2012 | LG Electronics 42IN WS LCD 1920X1080...

8 Answers

I fixed the blinking light, but still no picture


The constant blinking green light means for one minutes and then goes solid green, that the TV is not booting up. This is a common problem on this set.You need to remove the shield from the DM board (standing upright on the left where the DTV RF connector is)and inside you will see the four leaky capacitors (1000 MFD 16 VOLT)replace them,plug the TV in and wait 70 seconds for the blinking light to stop,then turn on the TV.The hard part will be removing the board from the TV(lots of screws and connectors,takes time)

a3d2d2a.jpg You must do some checks first:LED does not stop blinking after plug in. Verify the standby supplies, 12-volts at connector KA pin 17, 6-volts at KA pin 18 and the 28-volts at KA pin 19, if the supplies are present suspect the DM PCB part # 934C067001 LED does not stop blinking after plug in. Check C9B01, C9B02, C9B10, and C9B11 (1000 UFD 16) on the DM PCB, if they are bad replace them with part # 181P734030 (680 UFD 16 V). LED stops blinking after 70 seconds of plug in but will not power on. This model is equipped with a keyboard lock feature; this can be mistaken as a no power condition. To unlock the keyboard press and hold the "menu" button on the front panel for 10 seconds . LED stops blinking after 70 seconds of plug in but will not power on. Check for 3.2 volts DC at connector RF pin 4 and 5 on the Signal PCB if low suspect problems with the switches/buttons on the Control PCB part # 935D736001. LED stops blinking after 70 seconds of plug in but will not power on. Keyboard is not locked and key inputs at connector RF pin 4 and 5 check good suspect the E2P PCB part # 934C061001.

Just click below for more information.;

http://www.fixya.com/support/t838883-mitsubishi_wd_52825_tv_wont


Hope it may help you ;

Regards,
VOTIT

Oct 04, 2008 | Mitsubishi WS-65869 65" Rear Projection...

1 Answer

Hitachi C28WF532N problem with picture


Good day!!!


That problem is usually cause of faulty capacitors on the power supply board..

Just follow this instruction to fix your TV..

1. Open the back cover of your TV.
2. Look at the power supply board..Its normally connected to the power cord..
3. After that,,try to look at the actual image of capacitors if it is bulged on the top so that you can easily determine the bad capacitors..
4. After that,,try to replaced the bad capacitors using soldering iron and soldering lead..replaced the capacitors only with the same type ratings and value..
5. Some of the capacitors not bulged so its better if have a capacitance meter

Jun 22, 2012 | Hitachi Televison & Video

1 Answer

My Sony kp53hs10 turns on and has a picture but in afew seconds the screen goes blank and I see 7 blinking lights. Any ideas?


Good day!!!!


That problem is usually cause of faulty capacitors on the power supply section..

Just follow this instruction to fix your TV..

1. Open the back cover of your TV.
2. Look at the power supply board..Its normally connected to the power cord..
3. After that,,try to look at the actual image of capacitors if it is bulged on the top so that you can easily determine the bad capacitors..
4. After that,,try to replaced the bad capacitors using soldering iron and soldering lead..replaced the capacitors only with the same type ratings and value..
5. Some of the capacitors not bulged so its better if have a capacitance meter

Sep 14, 2011 | Sony KP-53HS10 TV

1 Answer

Hi there the problem is, The techwood 42" tv that we have is ok for the first ten minutes. Then after that the tv screen goes white. Then after about another ten minutes the picture is fine.Do you...


Hi, i think there is a loose or bad solder. try to inspect the power board for loose solder or in the area of the inverter board, resoldering some capacitors may electrecute you . leave the set unplugged for an hour before resoldering to allow discharging. you may replace some capacitors that seems slightly become fat..

Mar 06, 2011 | Televison & Video

1 Answer

Every ten to fifteen minutes the screen goes blank and no sound then in about 5 seconds the picture and sound comes back on, Vizio tv 42 inch, this also happens when when a cd is being watched


It can be that the 12/24vdc power supply go into shut down mode due to short circuits in the backlight inverter board. You need to check the output voltages of the power supply with and without the backlight inverter board connected to the power supply.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx

Aug 10, 2010 | Vizio GV42L 42 in. LCD Television

1 Answer

Screen goes blank but come back when TV is turned off and back on


Ur tv LCD inverter board it dead.Replaced this LCD inverter board ur tv picture will return.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter board for the replacement.It a long board in shape.

May 13, 2010 | RCA L32HD32D 32 in. LCD HDTV

2 Answers

After about ten minutes the picture goes blank but


It sounds like the main board may have went on the TV. It should be not that costly to replace

Sep 26, 2009 | Samsung LE40R74BDX 40 in. LCD Television

1 Answer

TV turns itself off after a few seconds, no picture at all


I had a similar problem with my Phillips 42 in. LCD HD TV.

Here's the problem. The Power Supply Board. I opened my TV up(warranty was up of course) and found several bad capacitors. Phillips and several other companies were sold capacitors that although were highly rated failed within 5 years because of a lack of preservatives. All sorts of electronic equipment is now being effected due to these defective capacitors.
Solutions?
1. Take it in and have it fixed
2. Open it up, check the board for faulty capacitors(bulged or leaking) Buy a new Power supply board and install it.
3. Remove PSB, remove faulty capacitors and replace with compatible new ones.

Hope this helps

Mar 28, 2008 | Samsung HLP4663W 46" Rear Projection HDTV

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