Question about Samsung SyncMaster 740N 17" LCD Monitor

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Samsung 740N blank screen

Samsung 740N began buzzing at startup, otherwise normal function, buzzing faded, unit continued operating as normal. Then suddenly, screen went blank, power indicator light is on. No buzzing. Currently not connected to VGA, but but there isn't a "no signal" message - nothing.
Suspect backlight power system. ("ballast"). Also help to disassemble and replace part(s).
louearl@shaw.ca

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  • 1,606 Answers

That sounds like a capacitor or maybe a mosfet died. Usually only capacitors 'sing'.

first you need to confirm it is the backlight section that died. simple visual inspection. You want the monitor plugged into a running booted computer. If you have anything that will do dual screen that lets you know what and where something should be on the screen being tested.If not anything will work. Let the computer boot up and then you will need to get close and near an edge. What you are looking for is a ghost image of the normal desktop. You may even be able to see the mouse move around. This is the actual picture produced by the lcd. It is very faint. The backlight acts somehwat like a projector bulb and shines through the lcd panel. So if you can see anything then your backlight or the backlight power are the problem. I'm in BC so its hard to reccomend any place for parts. Most of the ones I have fixed the parts were out of California.Cost should be about $70-$100.

If the backlight isn't the problem then it is usually a power section problem. The parts are cheap but the time to find the bad one can cost a bit. If you can find a place to fix it get an estimate. Then check out the replacement price of a new monitor. The prices have dropped and sometimes it isn;t cost effective to repair even a backlight on some models.

Posted on Apr 26, 2010

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F 56-2 ERROR CODE


Key Operator Mode
To the Key Operator
The key operator is trained to handle all special key operator functions that are not
accessible to the general user, such as monitoring overall copier activity, machine
performance, and service information; modifying machine settings; and controlling user
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A unique 4-digit key operator password is normally set by service at installation. If the
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To ensure the security of Key Operator mode, it is recommended that you establish a
unique key operator password, along with the key operator ECM master key code and
Weekly timer master key code, and keep them in a confidential file.
r HELP is unavailable in the Key Operator Mode
Key Operator Mode Screen 2
NOTE: The function number [12] Call remote service center and [13] Save ECM data to memory card on the
Key Operator Mode Screen will be dimmed and cannot be selected on the copier without the remote
diagnostics activated.
Key Operator Password Entry Screen Key Operator Mode Screen 1
Key Operator Mode 13-3
Key Operator Mode
To the Key Operator (continued)
How to Access the Key Operator Mode
1 First, be sure the copier power switch is OFF.
2 Then, turn power back ON while pressing the [HELP].
The Key Operator Password Entry Screen displays when the 4-digit key operator
password is set by service.
Otherwise, the Key Operator Mode Screen displays without the password
requirement.
3 If the Key Operator Password Entry Screen is displayed, use the keypad on the
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If the key operator password is not valid, check with your service representative.
4 To display menus [11] to [13] of the Key Operator Mode Screen, touch the lower
arrow key. To return the menu [1] to [10] of the Key Operator Mode Screen, touch
the upper arrow key.
5 Make setting changes from the Key Operator Mode Screen, as described on the
following pages.
NOTE: If an invalid Key operator password is entered, continue by entering the valid 4-digit password.
13-4 Key Operator Mode
Key Operator Mode
Function Menu Map
FUNCTION MENU SUB FUNCTION MENU AND SETTING OPTIONS
[1] Initial setting [1] Copy mode: [RADF; 1-1; 1-2; 2-2; 2-1]
[2] Copy density: [AES; manual]
[3] Lens mode: [AMS; ratio 0.33~4.00]
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[5] Output: [sort; group; staple-sort]
[6] Staple: [Normal 1 position left; Normal 1 position right;
Normal 2 positions left; Normal 2 positions right; Upsidedown
1 position left; Upsidedown 1 position right; Upsidedown 2
positions left; Upsidedown 2 positions right]
[7] Image scan: [Normal mode; High mode; Very High mode]
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[2] ECM Count limit setting
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[4] ECM On/Off Setting
[5] Copy-Limit-reached effect
[4] Lock/delete [1] Lock Job memory
job memory [2] Delete Job memory
[5] Paper type [Recycled; Colored; Letterhead; Special; Labels; Invoice; Legal;
Ledger; Blank]
[6] Control panel [Dimmer; Brighter]
contrast
[7] Key operator
[5-digit number]
Tel. No.
[8] Weekly timer
[1] Weekly timer On/Off setting
[2] Summer time setting
[3] Date & Time setting
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[5] Timer action On/Off setting

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http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

Service manuals:
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Key Operator Mode
To the Key Operator
The key operator is trained to handle all special key operator functions that are not
accessible to the general user, such as monitoring overall copier activity, machine
performance, and service information; modifying machine settings; and controlling user
activity, for billing purposes.
A unique 4-digit key operator password is normally set by service at installation. If the
unique code is not set by service, the copier will not display Key Operator Password
Entry Screen when the Key Operator mode is being accessed, and a key operator
password will not be required. A service-set 8-digit ECM master key code must be
entered by the key operator to access the Electronic Copy Monitor functions, and a
service-set 4-digit Weekly timer master key code must be entered by the key operator to
access the Weekly timer functions.
To ensure the security of Key Operator mode, it is recommended that you establish a
unique key operator password, along with the key operator ECM master key code and
Weekly timer master key code, and keep them in a confidential file.
r HELP is unavailable in the Key Operator Mode
Key Operator Mode Screen 2
NOTE: The function number [12] Call remote service center and [13] Save ECM data to memory card on the
Key Operator Mode Screen will be dimmed and cannot be selected on the copier without the remote
diagnostics activated.
Key Operator Password Entry Screen Key Operator Mode Screen 1
Key Operator Mode 13-3
Key Operator Mode
To the Key Operator (continued)
How to Access the Key Operator Mode
1 First, be sure the copier power switch is OFF.
2 Then, turn power back ON while pressing the [HELP].
The Key Operator Password Entry Screen displays when the 4-digit key operator
password is set by service.
Otherwise, the Key Operator Mode Screen displays without the password
requirement.
3 If the Key Operator Password Entry Screen is displayed, use the keypad on the
touch screen to enter your 4-digit key operator password; then touch OK, to display
the Key Operator Mode Screen. (See note.)
If the key operator password is not valid, check with your service representative.
4 To display menus [11] to [13] of the Key Operator Mode Screen, touch the lower
arrow key. To return the menu [1] to [10] of the Key Operator Mode Screen, touch
the upper arrow key.
5 Make setting changes from the Key Operator Mode Screen, as described on the
following pages.
NOTE: If an invalid Key operator password is entered, continue by entering the valid 4-digit password.
13-4 Key Operator Mode
Key Operator Mode
Function Menu Map
FUNCTION MENU SUB FUNCTION MENU AND SETTING OPTIONS
[1] Initial setting [1] Copy mode: [RADF; 1-1; 1-2; 2-2; 2-1]
[2] Copy density: [AES; manual]
[3] Lens mode: [AMS; ratio 0.33~4.00]
[4] Paper tray: [APS; trays 1, 2, 3, 4, 5, or Multi-sheet bypass tray]
[5] Output: [sort; group; staple-sort]
[6] Staple: [Normal 1 position left; Normal 1 position right;
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1 position left; Upsidedown 1 position right; Upsidedown 2
positions left; Upsidedown 2 positions right]
[7] Image scan: [Normal mode; High mode; Very High mode]
[2] Lens mode ratio [User Set ratio]
[3] ECM [1] ECM Password and User name setting
[2] ECM Count limit setting
[3] ECM Count Reset
[4] ECM On/Off Setting
[5] Copy-Limit-reached effect
[4] Lock/delete [1] Lock Job memory
job memory [2] Delete Job memory
[5] Paper type [Recycled; Colored; Letterhead; Special; Labels; Invoice; Legal;
Ledger; Blank]
[6] Control panel [Dimmer; Brighter]
contrast
[7] Key operator
[5-digit number]
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