Question about Samsung SyncMaster 551 15" CRT Monitor

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Only power led bilinking

On tra's primary widing& 180uf/450v volts updown so supply on/off regularly

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  • kang_ameer Oct 26, 2008

    when I install the cable and turn my monitor on, the display still off and the power led blinking.

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Replace 7805 regulator IC (604)

Posted on Oct 10, 2008

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Sony bravia klv40v300a lcd tv 6 time led bilink.what is the problem


It sound like it took a power surge. suggest you either have it serviced or replaced the tv itself. Frankly if it is not under warrenty then it is time to purchase a brand new tv.

Feb 20, 2015 | Sony KLV-40V300A Multi-System BRAVIA LCD...

1 Answer

The tv is completely dead. i check the power supply everything checks out ok, there is only 2.5 volts coming out of the supply module. the input of the computer module has the same voltage 2.5...


there may be some bad capacitors in the primary of the power supply. do you get any led lights the front? most polaroids will have a red led on the front if the standby supply is good. there will most likely be some smaller caps 47mf@50v 10mf@50v probably that value that are bad.

Dec 17, 2010 | Polaroid Televison & Video

1 Answer

Can not get computer to power back up no lights on front o rear just little light on mother board have dell 8400


Bad Power Supply, sscorbett.

Usually you have enough power to light LED lights, (Like the harddrive activity LED light for add-in cards, that you see on the motherboard), and spin fans, but Not enough power to turn the Processor on.

Dell Support >Dimension 8400 > Service Manual

http://support.dell.com/support/edocs/systems/dim8400/SM/index.htm

Technical Overview > System Board Components

http://support.dell.com/support/edocs/systems/dim8400/SM/techov.htm#wp1052739

harddrive activity light for add-in cards (SCSI LED)

The Dimension 8400 comes with an ATX style of Power Supply, that has a maximum rated Wattage of 250 Watts.
1) ALL of the LED lights combined use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts
3) A typical Processor can use 51 to 125 Watts.

Your Power Supply just has enough power to light that LED light.
Weak voltage power rail.
Replace the Power Supply.

[ There are three power rails inside that SMPS.
Switched-Mode Power Supply.

1) The 3.3 Volt power rail
2) The 5 Volt power rail
3) The 12 Volt power rail ]

The ATX form factor for a Power Supply refers to the size, and shape of the case, for one.
Approximately 6 inches Wide, 5.5 inches Long, and 3-1/2 inches Tall.
The ATX power supply case in the Dimension 8400 however, is shorter in length.
It is 4 inches Long. (Depth)

Not an advertisement for the website, nor manufacturer.
Reference for the case size, and power cables needed,

http://www.cputopia.com/hp-400w-dell-dimension-8400.html

Scroll down to see the connectors of the various power cables needed.

You may have a Power Supply with these dimensions, and needed power cables, in an unused computer.
Perhaps someone has upgraded to a better computer, and has an unused computer that you can temporarily borrow the Power Supply for a test unit.

Make sure it has at least 250 Watts (Maximum rated wattage), plus,

1) 20-pin ATX main power cable. (Or a 20 + 4-pin ATX main power cable)

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

[ 20 + 4-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20plus4 ]

2) 4-pin ATX +12 Volt power cable

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

Plus the various power cables needed for the Harddrive, optical drive/s, and computer case fan/s, if it/they do not connect to the motherboard.

Oct 21, 2010 | Dell Dimension 8400 power supply ** FREE...

1 Answer

Emachine total black , this are on fan


LED lights are on? Fans spin? I suggest you have a bad Power Supply.

1) eMachines are noted to have low quality Power Supply's.
Saves eMachines money so they can sell budget computers.

2) A bad Power Supply is one of the leading causes of computer failure. I have, (Had actually), a shop half full of computers with this 'ailment'.

Some caused by the owners never cleaned out the inside of their computer, nor the inside of the Power Supply, with a can of compressed air for computers on a regular basis as needed.

3 to 5 years without cleaning the inside of their computer.
Mice could have made nests inside easily, with the 'Gunk' that was there. A bald eagle could have too. Rant off.

Others, caused by the computer manufacturer used a low quality Power Supply.
Low quality components used inside.
One of the major components that fails, is caused by a particular Electrolytic Capacitor that is used.

http://en.wikipedia.org/wiki/Capacitor_plague

3) Power Supply's used in PC's are a type of SMPS.
(Personal Computer. Statement holds true no matter what type of personal computer it is)

[ SMPS = Switched-Mode Power Supply
PSU = Power Supply Unit
All terms relate to a Power Supply used in a PC ]

A bad Power Supply will have a weak voltage power rail.
There are three major power rails used in the ATX form factor Power Supply, for an eMachines T6420 desktop computer.

A) The 3.3 Volt power rail (DC)
B) The 5 Volt power rail (DC)
C) The 12 Volt power rail (DC)

(Two D cell flashlight batteries produce 3 Volts DC)

A Power Supply with a weak voltage power rail, may have enough power to light LED lights, and spin fans, (or spin a few times, ans stop), but won't have enough power to turn the Processor on.

1) ALL the LED lights combined use less than 1 Watt of power

2) EACH fan uses 2 to 3 Watts

3) A typical Processor can use 51 to 125 Watts.
Depends on what Processor it is.

eMachines T6420?
Uses an AMD Athlon 64 3400+, processor.
(Socket 939)

[The motherboard used is an MSI ms-7207
Also known as K8NGM2-L ]

http://www.emachines.com/support/product_support.html?cat=Desktops&subcat=T%20Series&model=T6420

This Processor can use Up To 89 Watts.

http://en.wikipedia.org/wiki/List_of_amd_athlon_64_processors#.22Newcastle.22_.28CG.2C_130_nm.29

No Processor running, No computer.
No computer = No Video Signal

Suggest using a KNOWN to be Good, Compatible power supply, for a test unit, if available.

Should be the ATX form factor.

Approximately 6 inches Long, (15.24cm), 6 inches Wide, (15.24cm), and 3-1/2 inches Tall. (8.89cm)

250 Watts.
Correct amount of power cables, and the correct type.

Sep 20, 2010 | E-Machines T6420 PC Desktop

1 Answer

Benq 567s lcd monitor does not power up. Switch led blinks but goes dead. Tried replacing capacitor 450v 82uf with 400v 100 uf but did not work. please help.


That cap is for the Primary power supply switching circuits. How is the DC secondary side, no blown fuse, shorted transistors in the inverter circuits? Pictures will help, budmrtn@aol.com
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net
It may have the same bd as DELL since BenQ makes monitors for DELL and HP.

May 21, 2010 | BenQ FP71G 17" LCD Monitor

1 Answer

Laptop won't power up without battery, needs 135W adapter


The ASUS power adapter is below spec and it may damage the adapter because the HP is drawing 45 W more power than it can deliver and will cause it to overheat.
The 17" HP requires 18.5 or 19 volts depending upon the model of the HP laptop (check the power requirements on the label on the bottom of the laptop). If the ASUS adapter doesn't deliver this voltage, it most likely won't power up the HP laptop.
Use the power supply/adapter from the other 15" HP. If this HP's adapter has a voltage output of 19 volts and the 17" laptop requires 18.5 volts, don't worry a voltage difference of 0.5 volts, the only problem is whether the power plug will fit into the power socket of the 17" HP laptop.

Oct 28, 2009 | HP Pavilion zd7020US Notebook

2 Answers

If anyone is in need of Polaroid lcd tv parts contact me


Do you have any power supply boards left for a TDA03211C?

Sep 09, 2009 | Polaroid TDA-03211C 32 in. LCD HDTV

1 Answer

TV will not come on


I am assuming this set employs a switch mode power supply as virtually all TV's do these days, the fact that the power LED is on means that the primary fuse is intact, usually means that the primary side of the supply is also working, firstly check the electrolytic capacitors in the supply especially the startup cap which is normally of low capacitance but high in voltage rating, eg: 2.2uf 450V, if this cap leaks it can cause the supply not to fully start. If the problem is still there you need to check that the supply is working, do this by disconnecting the main rail on the secondary side, this will be the highest voltage output usually anywhere from 80-135V and hang a globe of the same wattage as that stamped on the back panel of the TV, the globe needs to be a standard incadescent type that you use in your home lighting, switch the set on and if the supply hiccups then check for leakages in any of the diodes on the secondary side, best to disconnect one leg of the diode. if the globe lights the supply is running, the indication is then that the protection circuit has activated, although I do not advise disconnecting the protection circuit, I have done this to trace a fault, then reconnecting it, normally any faults on you main rail will enable the protection. if this doesn't help, I advise telling me more about the set.
I hope this helps.

Oct 08, 2008 | Polaroid Televison & Video

1 Answer

Astar LTV_3001 flat panel tv power supply is not giving me the 16V I need to run the audio amplifier. I need the identity, type, something on the Q12 transistor. This transistor is also linked to an...


Hello Sir,
I need paciffic how's the TV defective (problem) so you have fix all the transistor and the capacitors then what happen next? still can't resolve your problem? unit still not right? call me at 323-767-6030 maybe I could help you through.

Jul 30, 2008 | Astar LTV-20PW 20 in. EDTV-Ready LCD...

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