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Model VW37L HDTV 20a Picture flickers like a strobe light

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6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: FLICKERING BACK LIGHT

Sounds like you have an LCD tv with backlight problems. Check power board for domed capacitors and replace them. next check connections on the inverter boards. they are on the sides or just one side. Becareful there is high voltage output from these boards. If the cable from inverter board is not good to the screen you can get a strobing. the inverter boards may need replaced. or cales to screen may be bad. The panel also could be bad.

Posted on Mar 25, 2010

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alpug
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SOURCE: my vizio gv42l fhdtv 10a picture flickers like a

you need to check first the power supply board whether the output supply 12-24vdc for the inverter board is stable and not flactuating..you can measure the output voltage with a multitester..you get a voltage output of 12-24 with the inverter board is connected or loaded to the system.be carefull of the high voltage at the inverter board..once the output is stable replace the inverter board or you can measure the output of the inverter be very carefull..the output range upto 500vac.be carefull..if the high voltage is stable replace the lamps...tnx and good luck..

Posted on Jun 03, 2010

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  • 324 Answers

SOURCE: For vw37l hdtv 20a vizio t.v. The power supply

I unfortunately do not have a schematic for your set, but can give you some general information that may help.

Often these devices are either a VCR (voltage controlled resistor) or TCR (temperature controlled resistor) They are commonly used to "ramp up" power when the circuit is energized... in "old school" CRT sets, a common use was in the screen degaussing circuit. In LCD sets, they are most likely used to "fire up" the cold cathode discharge backlight tubes. They are indeed semiconductor devices and do not respond to digital meters... the input impedance is too high.You may get some sort of reading from an old Simpson 260 analog meter or something similar, but use caution because their operating voltage can damage semiconductor components. You would require a curve tracer to properly analyze the voltage ramp.

Posted on Jan 30, 2011

  • 159 Answers

SOURCE: I have a phliips hdtv lcd model 47PFL7422D/37. the

Hi, Yes unfortunately i know what it is. When repairing another make of hdtv one time, I used a different " BALLAST " for testing purposes-it was a little under powered to say the least-but i knew this-it allowed me to determine the bulbs were good. when the bulbs lit using my makeshift apparatus-HALF of the bulbs lit up lit up( dim on one side as well as some flickering! ) therefore you have a power supply that drives the backlights that is going "SOFT". Let FixYa know whatever else we can do to assist you. good luck. Prodzilla. P.S. there is a workaround you may try to give more life to this soft power supply, if able,go into menu and adjust brightness down a few notches until it evens out and stops flickering. Again good luck

Posted on Apr 02, 2011

budmrtn
  • 11361 Answers

SOURCE: I have a Digital Lifestyles

It can be bad power supply or backlight inverter board, or bad T-CON board, no way to tell unitl opening it up for details torubleshooting.
You can expect $150 and up for labor plus parts as needed, it will not be cheap!.

Basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: www.interliquidparts.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

Posted on Jun 25, 2011

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I have a phliips hdtv lcd model 47PFL7422D/37. the left side of the screen is darker than the right. The screen started flickering. like a strobe light. any suggestions????


Hi, Yes unfortunately i know what it is. When repairing another make of hdtv one time, I used a different " BALLAST " for testing purposes-it was a little under powered to say the least-but i knew this-it allowed me to determine the bulbs were good. when the bulbs lit using my makeshift apparatus-HALF of the bulbs lit up lit up( dim on one side as well as some flickering! ) therefore you have a power supply that drives the backlights that is going "SOFT". Let FixYa know whatever else we can do to assist you. good luck. Prodzilla. P.S. there is a workaround you may try to give more life to this soft power supply, if able,go into menu and adjust brightness down a few notches until it evens out and stops flickering. Again good luck

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For vw37l hdtv 20a vizio t.v. The power supply part # is DPS-201bp a rev.S1. What is the correct resistance for R805. What i read was a short on R805. Which THIS SEMI-CONDUCTOR (R805) looks like a...


I unfortunately do not have a schematic for your set, but can give you some general information that may help.

Often these devices are either a VCR (voltage controlled resistor) or TCR (temperature controlled resistor) They are commonly used to "ramp up" power when the circuit is energized... in "old school" CRT sets, a common use was in the screen degaussing circuit. In LCD sets, they are most likely used to "fire up" the cold cathode discharge backlight tubes. They are indeed semiconductor devices and do not respond to digital meters... the input impedance is too high.You may get some sort of reading from an old Simpson 260 analog meter or something similar, but use caution because their operating voltage can damage semiconductor components. You would require a curve tracer to properly analyze the voltage ramp.

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1 Answer

FLICKERING BACK LIGHT


Sounds like you have an LCD tv with backlight problems. Check power board for domed capacitors and replace them. next check connections on the inverter boards. they are on the sides or just one side. Becareful there is high voltage output from these boards. If the cable from inverter board is not good to the screen you can get a strobing. the inverter boards may need replaced. or cales to screen may be bad. The panel also could be bad.

Mar 25, 2010 | Televison & Video

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