Question about Polaroid 4011-TLXB LCD TV

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How do I diagnose bad power supply, if.....

....all the capacitors appear fine. The power light cycles from blue-to-red, and no picture or sound. The board number is 860-AZ0-JK371H. I can not find a legible schematic. I checked the caps with an ohmmeter (in circuit), and they all respond as expected. None are obviously blown as typical with this situation. The regulator, number STR-A6252M has some dark marking around it (as though it had been overheated). Does this part fail often? I can only get readings off three of the seven pins, as access is blocked by a heat sync. Can I bench test that part? What else can I look at with my multimeter to figure out what the problem is? No budget for this job. It must be in house, and next to free. I would appreciate any gratis info, or documents to help me solve my problem. Thanks.

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  • Ken Haggerty Jun 01, 2013

    One thing is I don't want to change any board.....I want to repair it/them. I also can't check inverter board power without a schematic, or at least knowing which pin to check. I do know that the power board is supplying 4.95 Vsb to the main circuit, which is allegedly sufficient.

  • Ken Haggerty Jun 01, 2013

    Until right now, I didn't know what a surface mounted fuse looked like, so I looked it up. It hey apparantly look a lot like capacitors. I will re-evaluate and get back. Thanks for the tip.

  • Ken Haggerty Jun 01, 2013

    If there's a surface mounted fuse on the power board, I can't find it.

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  • Polaroid Master
  • 1,525 Answers

Hi the blue and red cycling is a bad mainboard firmware fault thanks

shaun

Posted on Mar 19, 2017

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Posted on Jan 02, 2017

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SOURCE: I did the capacitor fix to my FLM-3734B but now

Check that everything is pluged in and only use 105 degree c caps 85 degree ones will not last long. New caps can be bad with todays parts i see lots of new ones that are bad. I would replace ALL caps on a power supply board the heat kills them so they may need replacing every year or more if the set is on a good part of the day. The power supply is on to some extent all the time a set is plugged in. Watch the + and - on the caps put it in wrong and you may blow out other parts and for sure the new cap.

Posted on Nov 02, 2009

  • 1779 Answers

SOURCE: Polaroid Mdl# TLXO4240B LED blinks red and blue,

Disconnect the jack lead that goes to the inverter board and see if you have 24v from the P/S. If you don't then you should replace the power supply. If you have 24v, then the inverter board is bad.

Posted on Nov 30, 2009

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How do I fix a Panasonic Plasma TV that won't power on?


SOUNDS LIKE NEEDS POWER SUPPLY,CALL PANOSNIC CUSTOMER SUPPORT

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Samsung 1080 picture glitching on model # HL61A750a1fx2c Versionre01


If it's all colors (Red, Blue, Green) doing the same thing at the same time, there are (unfortunately) multiple possibilities:

1) the AC to DC power supplies
2) the LED Driver Board
3) DLP driver, or DLP itself

The most likely problem is the DC-DC power supplies, which are known to have capacitors that go bad after several years of operation.

Due to this, there are many sources for either re-capacitor kits (DIY), or rebuilt power supplies with upgraded capacitors.

WARNING - Dangerous, and even lethal voltages are present inside your TV set. Do not attempt this unless you are trained in these kinds of repairs. Leave the TV unplugged for several hours (or preferably a full day) before attempting such.

DIAGNOSIS for bad capacitors: If you inspect the large capacitors on the power supply boards, and they are not totally FLAT across the top surface (if bulged at all), then you need a new power supply or new cap's. Likewise, if there is any leakage from the capacitors (usually a light-yellowish crusty appearing substance), they are BAD.

Sub-power supply:
BP96-01726B ASSY PCB P-SMPS Aquamarin,LED DLP TV,DC2

Main power supply:
BP44-01001A SMPS-DLP TV PN082DPS-VF(A),AC/DC,90V-132

A quick Google search for these part number (BP96-01726B & BP44-01001A) will reveal many sources, and pictures to verify it's what your set has.

1_12_2013_7_27_32_pm.jpg1_12_2013_7_27_48_pm.jpg

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1 Answer

Red light is on in front and have no picture


Good day..


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

As you stated your TV works fine and after a minute the red light comes on...

That symptoms is cause of bad capacitors..Normally bad capacitors can check visually if the capacitors look like leak/bulged on the top that is the indication of bad one but not all bad capacitors are bulged some are not so in that case you have to used a special meter called capacitance meter..

This is the sample picture of bulged capacitors:

12_6_2011_5_56_21_am.jpg

Dec 06, 2011 | Televison & Video

1 Answer

ELEMENT 46 INCH PICTURE WENT OUT ,SOUND WORKS OK. RED DISPLAY LIGHT IS ON WHEN OFF, BLUE LIGHT WHEN ON


Two bad capacitors in the power supply. it needs to be replaced and the screen will work again.thanks!

Jan 22, 2011 | Televison & Video

1 Answer

I have no piture and no sound the pwer indicator shows the tv to be on there is a red led on th power supply that is blinking does anyone know what migt be the proble


I have the same television and the power supply was bad, I had no lights on the front at all so I tried replacing the capacitors on the power supply thinking that would fix it. That did not fix it and I was told that not only do the capacitors go bad but sometimes something else on the power supply board goes bad and is very hard to diagnose without the proper training, so i bought a new power supply board. I put the power supply in and I then had all the lights on the front but the red led light on the power supply was blinking and the lcd would just show the polaroid picture on the screen and would try to light the back lighting but would immediately turn off.
I took a blow dryer and slightly warmed up the 5 blue capacitors that are on the main processor board "not the power supply board". 3 of these capacitors are 470uf @ 50 volts and the other 2 capacitors are 470uf @ 25 volts. It appeared that once the warmth did it's trick, it took a few minutes after warming them, the Tv now turns on. I am going to get these five new capacitors and change them on my main processor board (not the power supply board). I am guessing that either one of these capacitors or maybe all 5 are starting to malfunction, 2 of these capacitors do appear to have a slight bulge and crease on the silver top.
Watch your screen from behind the tv when turning it on, if you see the backlight turn on for about 2 seconds when the polaroid screen appears and then turn off you may very well have the same 1-5 capacitors malfunctioning on your main processor board. With that said if you feel that the power supply board is functioning as it should be and it sounds like it is then if you do not feel comfortable changing these five blue capacitors on the main board then you could always try replacing the main processor board with a new one. I believe that www.discount-merchant.com or www.shopjimmy.com has this board. Just get the part number directly from your old board and look that number up on their website. It is heart breaking almost using process of elimination when you have to spend money buying boards to accomplish this but I can tell you this, "electronics repair just for checking it out = $100 or more and then the price of the boards so you will reach well over $200 i would think" replacing the power supply cost me $78.00 and even if i have to replace my main processor board that will cost about $60.00 so I am still only at about $138.00, a new LCD tv of this size would cost about 350.00 or more. Now this information is only good considering that you feel comfortable enough changing the circuit boards yourself, be very careful of what you touch and try to touch only the outer edges of the boards.

Dec 05, 2009 | Polaroid TDA-03211C 32 in. LCD HDTV

1 Answer

FLM-3201 will not turn on


You can download service manual here:
http://www.polaroidsupport.com/polaroid/en_us-sm.html
Look for bad capacitors, burnt parts in the power supply first.
http://en.wikipedia.org/wiki/Capacitor_plague

Please post back what you find.

Oct 05, 2009 | Polaroid FLM-3201 Television

1 Answer

Power cycles when turned off


repeair your power supply again,change some of capacitor or diod and through soldering

Aug 28, 2009 | Polaroid FLM-2601 Television

3 Answers

Screen went dark


Ur video ic inverter board is dead.
U need a new one.

Aug 25, 2009 | Televison & Video

1 Answer

Powers up but picture doesn't appear.


Most likely the TV has a power supply related problem. It's possible that it maybe a bad capacitor or transformer on the power supply board. The most common thing to go out is the circuit board that supply power to the screen. Commonly called a Backlight Inverter Board.
But, I can't say it's 100% the problem because I can't actually look at the tv over the internet.

If by chance the TV is still under warranty, go that route.
If not under warranty and If you have some electronic experience, if you can find and purchase a Service Manual over the internet; It will help you diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you circuit diagrams, test points, and part# lists. Usually, cost under $20. And most cases the new part cost less than $15.

I hope I shed some light on the subject for you.

Jul 08, 2009 | Hitachi Televison & Video

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