Top 20 Polaroid FLM-4201 42 in. LCD Television Questions & Answers

This would indicate that your back light is out.

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/ Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

Check the speaker/s first. If found OK; check and replace the damaged component/s at its audio output section circuit board. If needy, 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. Surf the site with patience. http://electronicshelponline.blogspot.com/

if their is a sound with totally black screen the cause would be either inverter board get bad or the screen back light was damaged. if just a white screen, you can noticed by looking at the dark room. then the cause would be bad t-con board. just let me know if it can help you can ask further solution thanks for consulting through fixya.

Black screen canbe caused by bad T-CON board, main board, 24vdc power supply, backlight inverter board. Please my guide get more ideas on what to look for inside.

First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board. if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having. 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 Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague Parts: www.shopjimmy.com Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.

Connect the audio out RCA jacks (white and red) on the TV to the white and red RCA input jacks on the sound bar for analog stereo sound or connect the black digital audio output jack (typically optical) on the TV rear panel to the sound bar's optical digital audio input jack for surround sound. Use an optical cable. There may be some user settings on the TV for audio.

It may have dying power supply due to bad caps, cold solder joints, or problem in the backlight inverter boards, you need to do indepth troubleshooting.
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 Failed TV and Monitors: 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 he can make you a set of caps. Please post back what you find.

Failed capacitors are common problem in ALL switching power supply in TV and monitor. You may also want to look for cold solder joints and loose connections.
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

backlight invertor needs replacing

hello,
Power supply board have problems,just not dead yet.Replaced the power supply board,will solved this problems.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
Good luck...

Tries Websites like Shopjimmy.com,Ebay.com to buy a refurbish inverter board for the replacement.

does it have sound?

This sound could be a component on the circuit board coming loose and vibrating. Usually, this is an electrolytic capacitor. It could be some dust or foreign object has gotten close to the power supply and is causing a slight current leakage. You should have it checked out. If you get in there yourself, make sure you unplug the unit first. On the older tube tv's this sound would have been high voltage leaking from the anode wire.

You may have two bad capacitors...I think they may be 10 or 16volts at 1000MFs. They will be bulged..replace and see if it will work!

Power supply will be the first place to start, look for bad caps with bulging tops, check for 5vdc, 12vdc, and 24vdc at the power supply output connectors.

I would look at the main control board for bad capacitor there too, since the main board also contains a lot of switching power supplies for sub circuits.

its possible its coming from the digital board which you can get a a whole to exchange its around 400.00 or so or its the lcd panel which is as much as a new tv if you have a servicer there for polaroid you might talk to them

If you have have any indicator lights on, then at least he 5v standby circuit is still workin. The problem can be in the backlight inverter board or the power supply for the inverter board is bad. Look at the power supply module first since it is easy to get to for burnt parts, bad capacitors.
http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find.

Probably defective capacitors in the power supply.

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