Question about Polaroid FLM-323B Television

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Flm 323b power

Lighting struck pwr lines. fuze blown. fuze now blow upon pluging into wall without pushing the pwr on button.
ohm reading across pwr input at board 0 to 900k at about 1sec. pwr Cap good? no visable damage. my first thought was to replace all the large caps but they seem to charge with ohm meter

dean

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Hi,

Thier is a shorted with the line. Start looking from the plug until to the power supply the shorted line. use your multi tester. Dont plug it back until you find the shorted line. I recommend to go to service center if you couldnt find the shorted line.It might cause more problem if shorted line will not be fix.

Thank you... Please dont rate me if you are not satisfied with my suggestion. Tnx for using fixya....

Posted on Nov 13, 2008

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Hi,

Initially, pls cosider:

  • Lighting struck pwr lines - as long as the TV unit is plugged in even powered off, it will be affected especially the stand by power supply section;
  • fuze blown and. fuze now blow upon pluging into wall without pushing the pwr on button - would expect a sacrificial component such as a VDR, voltage dependent resistor specifically designed just for over voltages. It is a one time burn only, meaning soon as it goes dead/shorted it has to be replaced or removed otherwise the short would always exhibit itself;
  • ohm reading across pwr input at board 0 to 900k at about 1sec.
  • pwr Cap good? ...seem to charge with ohm meter - that would be normal. Capacitors when tested with analog continuity (VOM_) testers would deflect to the right and slowly go back left.
Additional ideas to explore:
  • focus on the power supply especially the orange, yellow and green components. The bridge diode would also be a suspect;
  • it may also be worth your while to check on the tuner block, that is attached to the cable input;
  • in most models, there would be fusible links/resistors or jumper fuses. they do not look like the ordinary fuse but looks like regular resistors except with zero ohms. of course if no continuity would be open and requires replacement.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.

Posted on Nov 13, 2008

  • Louie  Role
    Louie Role Nov 15, 2008

    Hi again,

    Any development(s) so far?


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With lightening strikes that hit power supplu lines nearby, I would not recommend even attempting to repair the set. Anything and everything may be blown. It is likely to be a blown rectifier in the power supply FIRST and if it went shorted, every other semiconductor after that.

Posted on Nov 13, 2008

  • Graeme Ross
    Graeme Ross Nov 13, 2008

    there may be spike suppression caps in and about the front end of the power supply circuit that have also failed, but the reality is, for Lightening Strikes... ring your insurance company. Often you can get the electricity supply company to also pay to replace/repair the set if they are required by Government regulation to maintain power supply within a certain percentile(this is the case in Australia at least-worth checking for your part of the world). If it can be determined by a qualified Technician that the set has probably been damaged by the power surge, then you will be able to make a fair claim. If you attempt to repair it FIRST then you will have no claim. Best bet is to have a technician write it up as a "write off" and make a claim at your insurance company, or the power supply company. I am happy to asnwer any more questions you may have.



    regards

    robotek

  • Graeme Ross
    Graeme Ross Nov 13, 2008

    Just went back to the manual(click here to get) to check to see if there is any mains switch the completely disconnects the power from the set. It appears that there is not. Because of this, as soon as you plug the set into the mains, the power supply is connected and running. I strongly doubt that there is any issue with the lead to the set as detailed by other experts. Nor would there be a problem relating to a short in that cable. As the power supply is active all the time the set is plugged in will most definitely have been affected and causing the fuse blowing problem you have, I would strongly suspect that the microprocessor stages powered by this supply would also be damaged by the lightning hit. In Queensland where I have my business, we see sometimes up to 20 blown sets from one storm. Mind you, we get some pretty severe thunderstorms. I guess what I am saying is I speak from actual experience in these matters.

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You could have a rectifier shorted and maybe even some other parts including the power transformer. If you have multimeter check the diodes. See if they are shorted.

Posted on Nov 13, 2008

  • Dave DeGain
    Dave DeGain Nov 14, 2008

    Isolate the transformer secondary from the rest of the circuit and see if it still blows the fuse. When you isolate the transformers secondary, it must not be plugged into the A/C outlet. Only after it has been isolated can you reconnect the power cord and see if the fuse blows. If it does blow, you have a bad transformer.

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  • Polaroid Master
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Test the cable first, there may be a short.

Posted on Nov 13, 2008

  • Ginko
    Ginko Nov 13, 2008

    Check the power outlet , and also the power cord, there may have been a short in there.

    If the power caps are fine, try replacing the fuse, and see if it blows again, if not is fine , if it blows, inspect the power board for trace or smell or burned areas, there may have been a short or some other component may have blown.


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Polaroid FLM-323B Service Manual Download


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on May 01, 2010 | Televison & Video

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FLM-323b Lines in picture...same


panel defective.caps only repair a power supply issue where the tv wont come on at all.
lines are 90% panel and 10% control pcb
connected to the panel.most control pcb are not
sold separate from the panel.

Jul 28, 2009 | Polaroid FLM-323B Television

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Polaroid FLM-323B Service Manual Download


Download Polaroid FLM-323B LCD HDTV Service Manual

Models: FLM-2632 / FLM-2632M / FLM-2634B / FLM-3232 / FLM-3232M
Models: FLM-323B / FLM-3234B / FLM-3732 / FLM-3732M / FLM-373B
Models: FLM-3734B / FLX-374

e7181ce.jpg

Have you misplaced your Polaroid FLM-323B LCD HDTV Service Manual?

Would you like a digital, searchable, pdf version of the Polaroid FLM-323B LCD HDTV Service Manual?

Follow this link (& click FREE) to download a pdf version of the operations manual.

I hope that helps.
____________________________________
Polaroid FLM-323B Manual Download

on May 01, 2010 | Polaroid FLM-323B Television

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Polaroid FLM-323B Manual Download


Download Polaroid FLM-323B LCD HDTV Manual

Models: FLM-2632 / FLM-2632M / FLM-2634B / FLM-3232 / FLM-3232M
Models: FLM-323B / FLM-3234B / FLM-3732 / FLM-3732M / FLM-373B
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Follow this link
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on May 01, 2010 | Polaroid FLM-323B Television

1 Answer

Response to your advice flm323b no pwr. deanhixson@sbcglobal.net


No, it will not. You must understand what type of readings you are supposed to get from them before you can determain if the reading is correct. A transformer will measure nearly zero ohms when measured across the primary or when measured across the secondary. You must know what the leads of the transformer are. Troubleshooting a power supply can be difficult at times. If I had the schematic for this unit I could probably point you in the right direction pretty quickly, but I do not have one. Most times the power cord will go directly to the transformers primary, maybe thru a switch and a fuse. In your case I think that it just goes thru a fuse and then to the transformer. In this case, it is likely that the transformer primary is shorted. If you know where the secondary is at for the transformer, you can disconnect it and then put a fuse in and see if it still blows the fuse. If it does, and the power cord is connected directly to the transformer without any other circuit branched off of it, then it could only be the transformer. If the power cord feeds another circuit, like for a standy-by circuit which supplies a voltage for the micro so the TV can turn on, the problem could be in that stand-by circuit. The stand-by circuit is normally a smaller transformer with a couple of diodes used as rectifiers and a smaller capacitor or 2 that also lead you to a voltage regulator or transistor that is used as a voltage regulator.

The most important thing you need to do is isolate the main transformer if it goes directly to the power cord. By disconnecting the secondary leads of the transformer you take it out of the circuit so that nothing on that side of it can be causing a short. If the secondary of the transformer is soldered directly into the circuit board, then you need to take that solder off of the secondary so that it is no longer in the circuit. You will need to do that with some solder wick which is used for removing solder. The leads for it must not be touching any of the circuit traces on the board. It is the only way to be certain that the secondary is not causing the short, or at least nothing in the circuit past the secondary is causing the problem.

This really should be an easy problem to find, you have a direct short somewhere, or at least a component directly in the path of the power cord that is near shorted and causing massive current draw. This is where the schematic is needed since I can not be there with you to actually look at it with my own eyes.

I hope this helps you find this problem, if not, we can continue this conversation. But I did notice that you have not rated, accepted, or not accepted any of the experts solutions. I believe in order for you to see more solutions you must rate the solution you have so far. If you accept a solution from an expert it will be that experts responsibility to help you solve your problem. Please be aware that some problems just can not be solved in an online forum, sometimes it it requires the technician to actually get their eyes on it. I would also like you to know that even if you accept this solution from me in this thread, I will not get the credit for it unless you accept the solution I provided for you in the paid question you posted earlier today. I can always post another comment on the paid questions thread if you would like to accept it there so I can get the credit for it. Any post you make on the paid thread you should use the experts name you want to communicate with so all the experts know who you are talking to, unless you are just wanting to let all the experts know .

One more thing you should know, since they do not explain it very good to the customers of FixYa!, the ratings in this thread are different from the ratings on the paid thread. Anything less than a FixYa! rating on this thread will lower my overall rating, but any ratings on the paid thread have no effect on the experts ratings. So a "Thanks for Trying" rating on the paid thread is not a negative rating, just means you want more help from other experts. But a "Thanks for Trying" on this thread is a really bad rating that no expert here wants to get. In the paid thread, the experts are just working to make money, here it is free and effects our overall ratings.

I hope this was not confusing for you, I can try to explain any of this post you do not understand, just let me know what you need explained.

Dave

Nov 14, 2008 | Polaroid FLM-323B Television

1 Answer

Polaroid FLM-323B nothing at all


Check and replace ALL high value electrolytic capacitors on the power supply board. The Polaroids have known issues with leaky caps in the power supply. It's best to just change them all to prevent future failures.

Nov 10, 2008 | Polaroid FLM-323B Television

1 Answer

FLM-323B LCD TV Polaroid


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

Nov 07, 2008 | Polaroid FLM-3732 Television

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