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Need A Circuit Board

Jaime8,
I am a retired Navy electronics kind of guy and have tried rebuilding printed circuit boards in the past. It hardly ever works. The circuit board would be a real bear to troubleshoot, especially without schematics. A new board is the only answer. Thans, Allen

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I would say that it might be hard to find those service parts as an entire assembly that is why I suggested to fix it to the component level.
Even finding and buying the assembly might not be economical depending on the price of your device.

Posted on Jul 27, 2008

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We have a Nakamichi T.V. model TN46LE-F..it has suddenly stopped working..can anyone suggest way out..


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

Aug 23, 2016 | Nakamichi Home Theater Systems

1 Answer

LED TV screen has flickered momentarily and faded to black. I have sound and power buttons light up. LED solid black, not lit. Bad LED Driver board?


Sounds like Back - light problem. Check and replace damaged component/s at its back-light inverter board, or 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. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Jul 16, 2016 | LG Electronics 55LE5400 55LE5400 55 LEDLCD...

1 Answer

I have a Samsung pn60e530a3fxza and it won't turn on. No clicking noise or anything. Almost like it isn't getting power. I had a tech support guy come out and he recommended that I replace the power supply...


Fault to the main power supply regulator section. 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. Surf the site with patience. 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.

Nov 05, 2015 | Samsung PN60E530A3FXZA

1 Answer

So I found out I need a circuit board for my panasonic sa-ht80.where can i get one from I tried everything. Please help


Guess you already tried ebay and the manufacturer.. But just keep checking because sooner or later it will appear. Today they had the entire receiver.

Did you check out the questionable circuit board for bad caps that are bulging or leaking? Burnt resistors? Diodes? U might get lucky.
U have nothing to lose and all to gain at this juncture.

Sep 16, 2015 | Panasonic Home Theater Systems

1 Answer

Smoke rolled out and then the unit shut itself down


By and large, electronic devices need the smoke to stay in for them to work. Once the smoke comes out, they generally don't work anymore.

Joking aside, the only parts that can generate enough heat to produce smoke will be the power supply transformer and capacitors. If you're lucky, the damage will be limited to the power supply, but there's a good chance that it went unregulated while it was failing and so dumped 120V into the main circuit board and cooked other components there.

If you are up for soldering, then open the unit up and post details of what components have visible damage, as well as detailed info about the circuit board revisions.
If you're not, then it's probably time to shop for a new receiver.

Sep 06, 2010 | Samsung HT-TX72 Theater System

1 Answer

When plug in my exterenal hard drive external hard drive it wont read it, all it says is "searching'


Hello

Okay , so there are some steps to figure out what is wrong with your external.

Firstly , if your computer makes a sound when you plug in your external , go to Start-Control Panel-Administrative Tools-Computer Management-Disk Management , and see if your external drive is listed here with your local drives. If it is listed , right click on the drive and change the drive letter to make it appear in "my computer".

If your drive does not make a connection sound when connecting to your computer and also does not show up , please follow the next step.

Remove the hard drive from the casing if possible and install it in your computer case or another external case.If the drive works , the problem is with the casing and you can ignore the drive.

Now , if the problem is with the casing , there are still 3 possibilities.

  1. The USB cable between the drive and the computer may be damaged.
  2. The circuit board which connects your drive to the interface of the external may be blown.
  3. The power supply (if applicable) may have a blown transformer.
The latter is the easiest to diagnose , does your external light up at all when you plug in the power? If not , then this is probably your problem. On the bottom of the adapter is a label which you will be able to use to have a new adapter made at your local electronics shop and this will cost about $30 max. They will also be able to test the adapter with a clamp meter to see if this is really the problem and this should be free.

The second component you want to test is the USB cable. If you have a printer , swop out the cables and see if your printer functions normally. Most externals use the same connector so you should be able to test it in this manner. If the cable works go on to the last step. If the cable is defective , replace it with a new one which you can find for about $10 at most electronics and chain stores.

The last component to test is the circuit board. This is a bit of a grey zone as you probably won't be able to spot the blown component unless it failed really badly. With the casing already opened , locate the external's circuit board and check to see if you have any blackened components or fluids leaking from some components. If all the other components of the external worked perfectly , then this is the faulty part. It is not really economical to replace the circuit as most of the time it is out of production by the time you need to replace it and it still costs a lot even if it is available so if your drive is working perfectly when connected via sata or IDE on your computer , the best is to buy a new casing and place your old drive in the new casing.

A casing costs about $50 and you could get it at most tech shops and big chain stores like Best Buy.

I hope this solves your problem and please reply if you need more help.

Kind Regards
Andrea

Aug 27, 2010 | LG LHT854 Theater System

1 Answer

The system keeps saying protected and turning off,


I am unsure of where to find this board but try ebay. as of today a replacement unit is 139.00 plus shipping. The board can be repaired, The problem is most likely a bad transistor. In some cases components surrounding the transistor will go bad also. If you can solder remove the transistors one by one until the protect mode goes away. Read the numbers off the part and type them into a search and order replacements. install the replacements and check for good audio out. Hope this helps.

May 03, 2010 | Samsung HT-X40 System

1 Answer

The home theather just stop working in the middle of a movie


Hello Sounds like the power board has blown. If you want you could take the cover off and look to see if there is a glass fuse it would be near were the power cord attaches to the circuit board. See if it is blown, if so replace, you may have had a weak fuse. But more than likely you have a defective power board, and the system will need to be service, or more economically replaced.
Thanks the Projector Guy

Apr 21, 2010 | Philips Home Theater Systems

1 Answer

Philips mx5700d.Power goes in but no power from first circuit board.How can i get this repaired or could i buy a new circuit board.BigRons1


I bought a second hand one of ebay which was also faulty in another area and took the part out that i needed and replaced.A lot cheaper doing it this way then buying a new circuit board.Thank-you for your intrest.Ron.

Oct 02, 2009 | Philips Home Theater Systems

2 Answers

Sony dav s400 protect sign?- HELP!


 NAME:  POPOOLA SAMUEL OKE 
EMAIL:greatpopson@yahoo.com
open the system and remove the cables (white cable) that are installed on the panel at the right hand-side.Replace the dettach cables after 10minutes,couple the system back and insert your cd.
i am sure it will work fine.

nb: the white cables are about 5cables at different location on the panel.

Aug 31, 2007 | Sony DAV-S400 System

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