Question about Samsung SyncMaster 940N Flat panel Monitor

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Hi I need to replace 3 x blown capacitors for my LCD monitor. They are 820uf 25v. Do they have to be an exact match ie ceremic/tolorences?

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They can be 1000uf 25v (20% higher value is OK), higher voltage is also OK but it may not fit the board. The temperature rating must be 105c and Low ESR type which is very important for switching power supply. You should replace them in a set.
You can get the PANASONIC FM or FC series from DIGIKEY, or from Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums

Posted on Oct 03, 2010

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I experience to replace 820uf/25v of 1000uf/25v and my monitor working again...as good as brand new

Posted on Aug 10, 2011

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Posted on Jan 02, 2017

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I have fixed 6 of these so far. All you have to do is replace capacitors C10...


The monitor is probably on protection.

To start unplug monitor from power and from computer and test computer with different monitor to find out if it is monitor or computer fault.

If it is computer fault and no video signal , then test:

  • Video cable.
  • Video adapter on PC (sometimes integrated on motherboard)
  • Motherboard.

If it is monitor fault , then the monitor is on protection.

When on protection you keep having a flashing led on front of the monitor , and monitor turning off by itself after a while, that indicates a fault condition.

The flashing light indicates a diagnostic state called protection.
When the Monitor goes on protection there are only two possible causes.

1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or a broken contact, identified an internal fault and kicked in , starting the flashing light.


If you are in situation one, then the monitor will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

Common faults that can occur are a blown capacitor on power board, faulty inverter board, faulty input board, or a fault on LCD Digital Controller board.

Check also the video cable or any external connection cable, if the cable is shorting, or the connector is bad, you can get same flashing state because of the video cable.

Try moving the video cable, and if the cable is not built in, then also try a replacement cable.

If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

on Sep 11, 2009 | Dell E173FP 17" LCD Monitor

2 Answers

I needed to replace 2 of my 820mf 25volt capacitors in my Samsung LCD TV. Problem is that I cant find these capacitors anywhere. I did found 820uf instead of 820mf. Are they the same capacitors and would I...


uf is for micro farad.
we have the same problem.
my 820uf/25v in my monitor need to replace but i didn't know where to buy this capacitor, so i try to replace it 1000uf/25v
and the result is OK. my monitor is working again. as good as brand new.
you can replace 820uf/25v by 1000uf/25v because they have a 20%tolerance...

Apr 07, 2011 | Televison & Video

1 Answer

Blow capacitor 820uF 25v? to replace 1000uF 25V other capacitor?


It is probably OK, possibly a filtering capacitor, besides no one makes a 820uF any more.

Dec 11, 2010 | Samsung SyncMaster 740N 17" LCD Monitor

3 Answers

Blow capacitor 820uF 25v? where can i buy them? or how to replace them with other capacitor?


You can buy that to an electronics store near your area. Replace that with same value or if you have higher than 25 volts use it provided that it is same as 820 microfarad.

Jul 09, 2010 | Samsung SyncMaster 740N 17" LCD Monitor

2 Answers

The screen not appear anything


There should be 3 820uf capacitor that need to be replaced on the power board.

Mar 10, 2010 | Samsung SyncMaster 740N 17" LCD Monitor

2 Answers

I have three blown capacitors. they say 820uf 25v. they all solder to the same part on the board. is it necessary to have three of the caps at 820uf 25v. or can they be added up like 820+820+820=2460uf 25v


Hello,

You need to have the 3 capacitors. There is not a 2460uf capacitor, If one of the 3 fail then the other two will still work, if you have just one capacitor and it fails then you have a dead power supply with the first failure.

Buddy
Corporate Computer
www.ccl-la.com

Jan 18, 2010 | Samsung SyncMaster 940N Flat panel Monitor

2 Answers

Takes 5 to 10 minutes for the video to appear


Sounds like it could be a weak capacitor. Caps that are bad or weak will work after they warm up.

Dec 09, 2009 | Samsung 225BW LCD Monitor

2 Answers

Flicker then display goes black


your monitor got trouble at:
1) monitor inverter board components fail like capacitor or MOSFET diver, it can repair or change this parts to fix.
2) there is disconnection between the inverter and CCFL lamps
need to check by technician, it could be fixed,
3) check the DCpower supply board capacitors swelling which need to reaplace, and fix it.
all steps need to do and fix it well.
hope help you something fixed, please take a rating let me know how much helped you thanks! keep in touch your question

May 24, 2009 | Samsung SyncMaster 2233BW 22" LCD Monitor

2 Answers

Samsung 740n death


What do you mean by dead???No picture,no raster...I don't have a schematic but by experience you have a problem in the PSU 5V power line

Aug 04, 2008 | Samsung SyncMaster 740N 17" LCD Monitor

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