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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Re: Need A Circuit Board
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.
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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
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.
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.
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.
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.
The USB cable between the drive and the computer may be damaged.
The circuit board which connects your drive to the interface of the external may be blown.
The power supply (if applicable) may have a blown transformer.
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
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.
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.
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.
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
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.
NAME: POPOOLA SAMUEL OKE
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.