Question about Intel D845EPI (INTELKD845EPILPAK10) Motherboard

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No power No response to front panel switch Replaced PSU, no joy. By passed switch on Main Board, no joy

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Hi williesos, Look at the capacitors near the CPU. If the tops are not flat or leaking a rusty brown crud then it maybe why the board will not boot. See this link for more info. on what to look for. These intel boards are known to have bad capacitors.

Good Luck!

Jim

Posted on Dec 11, 2008

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Posted on Jan 02, 2017

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LC-42LB261U. Why does nothing happen when power button is pushed?


Fault to its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. 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/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Sep 19, 2015 | Sharp Televison & Video

Tip

How to test an LCD TV or monitor PSU and inverter


Hi.

Before proceeding I assume you have technical training along with the multimeter. A full testing must be done with power on, and for safety reason must not be done by an untrained user.

The tip contains only general indications. The reader is supposed to have the training to apply in practice the testing method below.

If there is no power at all, then the responsible is almost always the PSU.

When there is no power, test AC in to PSU. If there is no AC in (read volts, or read ohms on power cable), that means that the power cord must be replaced.

If there is AC in, then test the PSU section near to AC input. You always find a resistor or a fuse in there . Check if it has blown.
After that you test the rest of PSU component. If there is no power at all , and problem is not power cord, it is often possible to spot at a glance a leaky or bulged capacitor.

If there is power, but the monitor stays in standby, then te PSU is forced to low voltage only by controller board. This happens when a fault had been detected.

In this case testing the PSU becomes more complicate. The technician must locate the control lines from controller board. This control lines operate at lower PSU voltage (often +5V), and turn on higher voltages on PSU board.

The inverter may use for example a +20V line from PSU. The +20V line is turned on by the controller board, closing a +5V control line to PSU. When PSU is in standby mode, the technician testing the PSU must bridge the +5V line with the PSU low +5V circuit, and test if the +20V line to the inverter gets turned on.

As explained this kind of test must not be done by the unexperienced user, as the chance to waste the unit beyond repair is high, and there are also many safety concerns.

After testing the PSU, next part to test will be the inverter board.

The inverter is tested reading DC voltage in from controller board, and AC out to back light system.
The inverter is an high voltage board, remember, safety first when testing AC circuit.

If the inverter has no DC from controller, then test PSU, if PSU is OK, and inverter has still no DC in when PSU line to inverter is on, then replace controller board.
If the inverter has DC in, and no AC out, then replace the inverter.
If the inverter has DC in and AC out when higher DC voltage to inverter is turned on, then test at component level the main controller board, and if present test LCD controller.

Regards.

on Mar 03, 2010 | Televison & Video

1 Answer

Rca tv powers up has backlight no sound or picture replaced main board and inverter


I would check the input board for correct power supply input
check the blue 15pf 6kv caps near the output from the PSU to the inverter.

Aug 31, 2014 | RCA 46 46LA45RQ LCD TV

1 Answer

My Hitachi L42VC04UB replaced a failed power board .The television comes on and after a short time it shuts down and the standby light in the front of the television flashes blue and red .This happe


Well either the TV's main (or other) board overloads the power board and it shuts itself off or the power board itself shuts itself off for whatever reason or the main board shuts off for whatever reason.

With the setup you have I'd say it's probably going to be difficult to figure out which one it is.

You will want to have yet another board - either main or power - to eliminate one of the two most likely possibilities.

What did you do with the original power board?

If you keep it you can probably send it to us for repair....or if it's cheap enough just buy another one.

i don't think there's an easier and affordable way to narrow it down than using a third board.

www.coppelltvrepair.com

Oct 08, 2012 | Televison & Video

1 Answer

I have a Samsung LE32R88BD TV 4 yrs old that when switched on now shows an image on the screen for about 1/2 second and then goes black. The audio of the channel continues.


Hi.

Check if there is on screen display (there should be none) and make sure that the problem occur with all inputs.

The problem is either defective PSU or defective inverter board. A bad main controller board or LCD panel can give the same problem but it is not common. Testing is done tracking voltage from PSU to inverter and LCD panel.

Here basic troubleshooting.

If the problem is not the connection, then it is usually the inverter not getting powered. In that case PSU, main controller board and inverter must be tested. Here general explanation of testing involved: How to test an LCD TV or monitor PSU and inverter.

Regards.

Ginko

Aug 28, 2011 | Televison & Video

2 Answers

Server is not powering on


Switch PSU between bays Use spare PSU
If server is still not working PSU backplane needs to be replaced. IS spare PSU sovles the issue, then it was a faulty PSU

Feb 26, 2011 | HP Compaq ProLiant ML350 G5 Server

2 Answers

My computer wont turn on


take out the psu completely from the cpu/tower, plug in the power cord,if there is a switch on the psu turn it on, next locate the main power connector (24pin) and find green wire,take a piece of wire and insert it into the green wire connector,next touch the other end of the wire to the psu outer case or a black wire on the main connector,if all is well the psu will turn on,if you have a dc voltage tester check the voltages on the red and black wires on molex connector...5vdc,yellow and black...12vdc.if ok look at the main board and inspect the capacitors to see if they are swollen, if ok
replace psu and disconnect hdd,cd/dvd,floppy ect from main board only leave memory,processor and video, power on if ok shut off and reconnect hdd, power on, if ok shutoff and connect floppy, if ok power off and connect cd/dvd drive.during this testing you will know what is bad.let me know how it turns out.email; arjoon.ken@gmail.com

Feb 19, 2010 | Computers & Internet

1 Answer

Motherboard shuts down before booting !


You should clarify this a bit more, but please make sure all of your fans are plugged in and the no jumpers are set to over-clock the processor.Also, double check that everything is fundamentally compatible.

Dec 16, 2008 | Computers & Internet

2 Answers

Computer will not boot


Option 1 :

Remove completely the mother board from Cabitnet.

Try to check it on other Cabinet.


Option 2

Remove mother board and re- plug the SMPS power Connecter to Mother board outside of cabit and make sure that motherboard is not touching directly to Metal part of cabinnet.


then switch on computer and check


Nov 22, 2008 | ASUS P4S800-MX Motherboard

1 Answer

DELL W2600 Power Fault


get yours replaced for free

http://www.dellcommunity.com/supportforums/board/message?board.id=si_hmtheatre&thread.id=2509

Jun 21, 2008 | Dell W2600 26 in. LCD Television

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