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Posted on Mar 08, 2017
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Please help my Polaroid 37" lcd

I wonder if you could help me? I've been on Fixya quite a bit lately. First off, I fixed my TV 37" lcd by replacing the two bad capacitors. Worked great. Then while using the shopvac in a plug nearby, I noticed the red LED on my tv went out (dead no LED...nothin). I replaced the fuse in the plug insert with a 3a, 250v (the didn't have 4a) fuse and got a red light back but with a subtle screeching sound from the power supply board that seemed to get louder when I pressed the power button and the blue light appeared. After about 5 seconds of blue light, the tv would die again. Same result multiple times and with black screen only. Do you think my problem is my power board? I did notice a small burn circle behind it on the metal plate, (Forgot to replace the white plastic protective board that prevents this) duh. The 2 capacitor still look good, no bulging. Would it be wise to replace the power supply board ($130). Please help? Thanks jonathan moeller

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The Knight

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  • Polaroid Master 76,851 Answers
  • Posted on Mar 08, 2017
The Knight
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Sounds like The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

1 Related Answer

Jaime Hernandez

  • 2351 Answers
  • Posted on Nov 29, 2008

SOURCE: Is it my Power Board?

I repair power supplies for these LCDs. If you need further assistance you can write to [email protected]

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Polaroid tv picture went off,came back on and started smoking
You should leave it unplugged, you need to inspect the power supply module and the backlights inverter boards fpr burnt out parts, More likely you will have to replace the module unless you want to fix it down to componenent level.
Parts inside the TV:
http://www.shopjimmy.com/catalogsearch/result/?q=Polaroid+FLM-3734B+

Backlights inverter board is not shown.

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Basic LCD monitor and TV troubleshooting guide:
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: http://s807.photobucket.com/albums/yy352/budm
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.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Please post back what you find.
Please leave rating if it helps.
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Jan 11, 2011 • Polaroid FLM-3734B 37 in. LCD HDTV
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My TV screen just went black, i have had some problems with it freezing in the pass but i thought it was temporary. so tonight i was watching football and it just went black! so i was wondering if i could...
This solution is for a Polaroid flm-373B 37 inch LCD TV. I noticed your TV is the flm-3734B. Hopefully this solution will work for you too.

I suspect you may have 2 capacitors in your control module that need to be replaced. When these caps start to go bad it will often show up as a problem with the sound. However, when they get really bad they can prevent the TV from turning on. Please see the link below, posted by stiv0. It gives detailed instructions on how to replace these caps and to tell if they're getting bad. If you follow these instructions you can take the back off the TV and check out the caps. If the tops of the caps are bulging they need to be replaced. Just be sure to replace them with the correct value (1000uf) and use caps that are rated at a higher voltage than the originals. I replace the 10v caps in my flm 373B with 25V caps just to be on the safe side. If you know how to solder this is an easy and inexpensive fix. If you don't know how to solder find a friend who does. These caps have positive and negative terminals. It's important you solder the new caps in with the correct polarity. Stiv0 gives instructions on this. Even if the caps aren't bulging this fix is so inexpensive, less than 10$, that you may want to try it anyway. I hope this helps you out.

http://www.fixya.com/support/r741402-polaroid_flm_373b_lcd_tv_black_screen
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Sep 27, 2010 • Polaroid FLM-3734B 37 in. LCD HDTV
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Go to youtube.com. search, Polaroid 37 lcd hd repair. Two or three vids on how to fix. Radio shack has 45 watt capacitators for about 4.70 for two. Easy fix or get someone to help.
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Jul 26, 2009 • Polaroid FLM-3734B 37 in. LCD HDTV
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use this link for a 37 inch repair that has been successful, I have not tried it yet as I found it too late, and the parts have been purchased and sent. Tis repair has 0ver 150 positive responses. Hope it helps you.
http://www.fixya.com/support/r741402-polaroid_flm_373b_lcd_TV_black_screen
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Dec 16, 2008 • Polaroid FLM-4201 42 in. LCD Television
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Here's the fix:

http://www.fixya.com/support/t293971-37_polaroid_lcd_tv_turn

I had the same problem with mine. Replaced the capacitors and now it works. When you open the back of the tv up, the problem is with the 2 capacitors on the upper left of the top card. Mine didn't look damaged except for a very, very slight bulge on the top. If you've never soldered anything, you might want to take it to someone who has, otherwise, it's a pretty simple fix. I was surprised I could do it so easily.

If the warranty is still good, make Polaroid replace it. They make shoddy products and should pay for it. And never buy another Polaroid again.
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Oct 26, 2008 • Polaroid FLM-3734B 37 in. LCD HDTV
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I had the same problem. But found the fix on this website!!

http://www.fixya.com/support/r741402-polaroid_flm_373b_lcd_tv_black_screen

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Aug 28, 2008 • Polaroid FLM-3732 Television
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Help with tv
http://www.fixya.com/support/t293971-37_polaroid_lcd_tv_turn
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Jun 26, 2008 • Polaroid FLM-3734B 37 in. LCD HDTV
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http://www.fixya.com/support/t293971-37_polaroid_lcd_tv_turn
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Jun 09, 2008 • Polaroid FLM-3734B 37 in. LCD HDTV
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These Polaroid LCD sets all fail like this. Bad power supplies. Call the warranty number and demand to have the main module replaced even if it is out of warranty.
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Feb 04, 2008 • Polaroid FLM-3734B 37 in. LCD HDTV
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