Question about HP Md6580n 65 in. HDTV

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What cause polarization in HP TV

Mainboard replacement

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  • Mike Morton Dec 09, 2012

    It's getting worse and I believe it's polaarization or banding issue and from what i can tell in researching this, it's likely the circut board. However, there are several mainboards in the HP md6580n DLP HDTV. Depending on the board will determine if I want to put how much money into it. Currently I see there are three boards, could one of these be the one - MAIN BOARD MODULE ASSEMBLY, Printed circuit board assembly (PCBA) - Main board, XHD4 version, and theDigital television (DTV) receiving module - ATSC, CNTC and QAM ready. Does anyone know if one of these boards will correct the polarization in my TV?

  • Mike Morton Dec 09, 2012

    OK, so i said Ploarizationa and I meant Posterization - Sorry!!



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Visit the site named 'Electro-help' for more details. Click this link. View it in "Timeslide" or "Flipcard" option, which can be selected from the drop down box menu by the [Sidebar] tag, at the top left corner of the display window. You can also click the [Home] tab to see the latest updates. It will make search easy. There are more than 1350 posts to different brand TVs now. Pull up older posts there or do a search by type in the Brand Name of your device in the Search Box, at the top right of the display window.

Posted on Dec 09, 2012


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Have samsung hp-s5053 that takes about 20-30 to power up after pressing the power button. Been told it was some bad caps. Can you tell me which caps they are? Which board are they on?

If it is bad capacitors, they will be on the mainboard. Usually, this means a new mainboard. Replacing capacitors is impossible. The part number will be located on a sticker on the mainboard inside your TV. These sets use several types of mainboard. You will need to get the number off your specific board to find the right replacement. You may be able to source a cheaper one but new (if available) + labor will be about $400.

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Fixya Manuals

I assume you mean you changed capacitors on either the mainboard or power supply. My first question would be why you did this in the first place. If no power then you may have a additional problem other then capacitors. Unless the caps were blown or you tested them with a ESR meter then they might have not been bad.. Or they could have cause another component to go bad or vice versa depending on the circuit. Did you make sure you installed the new caps with the correct polarity? If so.. did you test the new caps with a CAP/ESR meter to make sure they were good? If cap were good, correctly installed, correct polarity, good soldering job.. then there is another bad compotent on the board some where.. with out proper testing it would be hard to say.. usually on & off issues are power/capacitor/mainboard related.

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Over time, my 2007 Samsung LCD TV, model LNT4665F has developed random vertical pixel noise lines scattered throughout the screen. What could be causing this?

This TV is known for powersupply failures and this can be effecting the incoming voltages into the mainboard (AKA tuner board). This would cause the noise. Please have someone look into the powersupply and check that the proper voltages are coming from it. If they check out ok, you need to replace your mainboard.

Please rate if this helped :)

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Hp pavilion dv6000 multiple images horizontally and verticle lines throughout the screen.

Does the video problem occur when connected to an external monitor?
If it does then unfortunately the most likely cause is either:
1. Bad memory modules, try pulling memory chips and rotating between slots to see if any change. If necessary replace faulty memory modules.
2. there is a very large number of these HP/Compaq models that have serious problems with the Video BGA chip coming unseated from the mainboard over time.
This can be repaired by reflowing the BGA chip, but is an involved process, and not for a standard user.
Otherwise the mainboard will need to be replaced.

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1 Answer

No power


There are two problems which are common with the line cord on appliances. Don't overlook these really simple things when troubleshooting your vacuum cleaner - or fancy electronic equipment! If wiggling the cord has an effect, then the following are likely causes:

Repeated flexing results in the internal conductors breaking either at the plug or appliance end. If flexing the cord/squeezing/pulling results in the device going on and off, it is bad. If the problem is at the plug end, cut off the old plug a couple of inches beyond the problem area and replace just he plug. If the problem is at the appliance end, an entire new cordset is best though you can probably cut out the bad section and solder what remains directly to the mainboard.

In either case, observe the polarity of the cord wires - they will be marked in some way with a ridge or stripe. It is important that the new plug be of the same type (polarized usually) and that the cord is wired the same way.

The prongs do not fit snugly into older worn outlets. This can usually be remedied by using a pointed tool like an awl or utility knife to spread apart the pair of leaves often used to form each prong of the plug. If the prongs are made of solid metal, it may be possible to spread them apart - widen the space between them. Alternatively, get a 3 to 2 prong adapter just to use as an intermediate connector. Spread the leaves of its prongs. However, a new outlet is best.

Bad connections on the mainboard. As you flex the cord, it is also stressing the attachment to the mainboard and affecting some marginal solder joints.

It is important to deal with these symptoms as soon as possible as erratic power cycling can lead to much more serious and expensive problems down the road.
Good luck...

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I think I came across to a similar situation, try resetting the RAM by pulling it out and inset it back properly. If it does not work, try replacing the RAM from a working Laptop and see. Normally after disassembling the laptop assembling it again the RAM does not sits down properly causing the no display or a faulty RAM either.

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Reverse polarity of the power supply to a laptop will damage the motherboard if there is no reverse polarity protection built-in to the motherboard circuitry.

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Strange colors and shadowing and then went black.

something on the mainboard went bad and shut the tv down and whatever part it is will be on the new replacing the board you are replacing the problem

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It is hard to find a company that will tell you where the parts come from. Most parts you cannot purchase in america.
Here is a website I would suggest that will help you at best!
Please copy and paste in your browser

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Attention, noisy pictures on dynamic image does not mean to change the main board, most of the time , the panel need to be replaced, not the main board.

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