三星T190液晶显示器维修手册-2

4. Troubleshooting4. Troubleshooting4-1. custom mode as follows before beginning a repair.

• Resolution: 1440 x 900

• H-frequency: 60 kHz

• V-frequency: 56 the screen is blank, check whether the power cord is connected circuits to check:

• When the raster does not appear: The Function PCB, Main PCB, I/P PBA

• When 5V is generated but a blank screen is displayed: Main PCB

• When 5V is not generated: I/P PBA4.“Press the MENU button and hold down the, “factory mode. (Enter, Source)” button for more than five (5) seconds to return the monitor to

4-1

4. Troubleshooting4-2. When the Power Does Not Turn OnSymptom- When turning on the Power button after connecting the power cable, the LED at the front of the

monitor does not operate.- When turning on the Power button after connecting the power cable, the LED at the front of the

monitor does not checkpoints- Check the IP board power fuse and the IP board output power.- Check the connections for the IP board and the Main board inside the monitor.- Check the Main board power part and also check whether there is any abnormal output at any of

the other output 602CN 600IC 601YesCheck the connection status for

the function DC 5V measured at pins 5, 6 of the

CN600 connector when pins 3, 4 are

0V?YesDiagnosticsIIs DC 3.3V measured at pin 3 of IC601

when pin 1 is DC 5V?YesIs DC 1.8V measured at pin 2 of IC602

when pin 3 is DC 5V?YesCheck and replace the IP nNoReplace the IP k the circuits related to

k the circuits related to

sure to disconnect the power before working on the IP board.4-2

4. Troubleshooting4-2-1. Circuit diagrams when the power does not turn on4-3

4. Troubleshooting4-3. When the screen is blank (Analog)Symptom- LEven though the LED power turns on, the screen is blank when connecting the VGA cable.- Even though the LED power turns on, the screen is blank when connecting the VGA checkpoints- Check the D-sub cable connections.- Check whether the LVDS cable is connected correctly to the panel.- Check whether the lamp connector of the panel is connected correctly to the IP 400X 201IC 200R111, R114, R118Check the signal cables and

their ① Is X201 oscillating correctly?Yes② Do the RGB inputs appear at R111,

R114, and R118?YesDiagnosticsDo the ③ Hsync and ④ Vsync

waveforms appear at pins 32, 33 of

IC200, respectively?YesDo output signals appear at pins 8 to 30

of CN400?YesIs DC 5V measured at pins 1, 2, and 3

of the CN400?YesCheck and replace the k the +5V_Panel signal

and the BL_EN k the circuits related to

k the circuits related to

k the R111, R114, and

R118 input k and replace the circuits

related to nMake sure to disconnect the power before working on the IP board.4-4

4. Troubleshooting4-3-1. When a blank screen is displayed (Analog)②①③④4-5

4. Troubleshooting4-3-2. Waveforms when no screen is displayed (Analog)

①③④4-6

4. Troubleshooting4-4. When a blank screen is displayed (Digital)Symptom- Even though the LED power turns on, the screen is blank when connecting the DVI cable.- Even though the LED power turns on, the screen is blank when connecting the DVI checkpoints- Check the DVI cable connections.- Check whether the LVDS cable is connected correctly to the panel.- Check whether the lamp connector of the panel is connected correctly to the IP 400X 201IC 200R100, R101, R103, R107Check the signal cables and

their ①Is X201 oscillating correctly?Yes② Do the inputs appear at R100,

R101, R103, and R107?DiagnosticsYesDo output signals appear at pins 8 to 30

of CN400?YesCan DC 5V be measured at pins 1, 2,

and 3 of CN400?YesCheck and replace the k the Panel EN signal

and the BL_EN k the circuits related to

CN400NoCheck the R100, R101, R103,

and R107 input k and replace the circuits

related to nMake sure to disconnect the power before working on the IP board.4-7

4. Troubleshooting4-4-1. Circuit diagrams when a blank screen is displayed (Digital)4-8

4. Troubleshooting4-4-2. Waveforms when a blank screen is displayed (Digital)①②4-9

4. Troubleshooting4-5. Error Examples and ActionsError AppearanceSymptoms and ActionsSymptom: DVI signals are not : This error occurs because the PC cannot

recognize the mode information since the

DVI DDC is not input to the the DVI DDC.* A Full White pattern is a feature of a

TN panel when no video signals are

s*On how to input DDC, refer to the

training :

Symptom: A full white screen is displayed regardless of

the signals when turning on the : This error occurs when only lamp power

is supplied and the video signals are not

input to the panel due to an LVDS cable

connection e the LVDS cable or connect the

cable correctly so that the video signals can

be supplied to the :

4-10

4. Troubleshooting4-6. Adjustment4-6-1. Service Adjustment tions before a Service Adjustment

1) Check whether the devices for the service adjustment are operating normally.

2) Secure a space that is sufficiently wide for disassembling the monitor.

3) Prepare a soft mat on which the monitor will be ng Service Mode

Entering:Exiting:MenuPower OFFBrightness 0Power ONContrast 0Hold down the Enter button for five (5) Service Items to Perform after Replacing a Board

1) Check the PC color adjustment status.

2) Input DDC (input both of Analog and Digital).

3) Check whether the appropriate MCU code for the model is input.

4) Hard power the monitor off after entering service mode and performing a EDIT Data Input

1) Use when updating the AD board code.

2) Download the WinDDC program, DDC Input program, and Hex and DDC files appropriate to the model through the

Quality Control department of Samsung Electronics. Install the jig and input the data, as shown in the figure.

Monitor needingadjustmentParallel

Connector(25P Cable)MTI-2031DDC MangerConnect Monitor(Signal Cable)4-11

4. Troubleshooting4-6-2. Service Function SpecificationsChecking the Code Version1. Check the MCU code version and checksum after entering SVC Mode.2. Entering SVC Mode

- Adjust the Brightness and Contrast values to 0.

- Hold down the Enter button for five (5) seconds.

- The SVC Function OSD is displayed.

- To exit the SVC Function, turn the power off.3. Safe Mode

- When the input signal is higher than the supported frequency of the product, safe mode gives users some time (one

minute) to change the video card settings to the Recommended Mode informationSelect the Auto Auto optionSelect the PixelShift yScaler VenderMicom versionMicom checksumService Mode (Moving around)1. Press the + button to move to other items.4-12

4. Troubleshooting2. Press the - button to change the setting to On or Off.When replacing the panelAfter replacing the panel, move to the Panel item and hold down the Menu button for five (5) seconds.

The Ch. No is incremented by 1 and then both the On Time and Cycle are set to number is incremented by 1.4-13

4. TroubleshootingInputting the DDC Data12345Use the DDC Manager MTI-2050 version or later.1) Click the Open [F5] icon.

2) Select a port.

3) Open a DDC file.

4) Select a date and click the OK [Save] button.

5) Click the Next [OK] button.

66) Enter the serial number and then press the Enter button

※When inputting digital data after inputting analog data, repeat steps 2 to 5.4-14

4. TroubleshootingInputting the MCU Data11) Check the following options.

- Manufacture: MSTAR

- Device Type:TSUM16_ROM128K_ext_flash

- Communication Port: DSUB15 (Analog)

- External Memory: PMC25LV010E

22) Click the LoadFile button, select an MCU code file, and then click the Open [O] button.4-15

4. Troubleshooting33) Click the Auto Program button.

4) When programming and verification are complete, hard power the monitor off and then on again.4-16

4. TroubleshootingInputting the Code (HDCP)1. Run the file.2. Click the HDCP button.4-17

4. Troubleshooting3. Click the HDCP Write button and select MStar_HDCPKEY.4. Inputting the HDCP key is completed.4-18

6. Wiring Diagram6. Wiring Diagram6-1. Wiring Diagram - Main BoardLamp wire for PanelLVDS for PanelVGA Input6-1

6. Wiring Diagram6-2. Wiring Diagram - IP BoardLVDS Connector(Connect to Panel)3708--003847IP

boardScalerSE758MRH-LF3701--001219Function Connector(Connect to IP-Board)DVI Connector(Connect to PC)RGB Connector(Connect to PC)6-2

6. Wiring Diagram6-3. Connector FunctionsConnectorCN101

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