Samsung PS50P2HTX Troubleshooting

Troubleshooting

Samsung Electronics 6-1

6. Troubleshooting

6-1 No Raster(Board Change in PDP Monitor)

ST- BY Mode(LED:RED)

Pow er On

8J1

Repl ace scal er B ’d

(LED:GREEN)

Output

or Go to Page 7- 2

SM PS

Output Voltage

Input

Logic Connect Pow er Replace SMPS

LED Light- on

(Power,Sink)

X- B’d Connect Power

X- B’d

Output

Y- B’d Connect Power

Y- B’d

Output

Rep l ace Panel

ST 5V

normal

Abnormal

normal

Change Fuse

normal

Abnormal Abnormal

normal

Replace Logic B’d

Abnormal

normal

Replace X- B’d

Abnormal

Replace X- B’d

normal

Abnormal

6-2 Samsung Electronics

Alignment and Adjustments

6-2 No Raster in Scaler Board

Normal

Abnormal

Normal

Abnormal

Normal

Abnormal

Normal

Abnormal

Normal

Check Input Signal of U38 uPD64082

Pin 88(CVBSin)

CHECK

UPD64082

CHECK INPU T SIGINA L

Check Input Signal of 3U1 VPC3230

Pin 75(Y IN)

Check Output Signal of 3U3 SDA9280

Pin 47(Yout),

Check Input Signal of 1U1 AD9884

R,G,B IN A ND H,V IN

Normal

Check Output Signal of 1U1 AD9884

Pin 115(CLK), 85(G7), 105(R7),65(B7)

Check Input Signal of 5U1 LV DS IC

Pin 2 7(L H S),28(L V S),32(CL K )

Check Output Data of 5J1

Check 3U1, 3U2 OR3U3

CHECK 2U2

CXA 2101

CHECK 1U1

AD9884

CHECK PW364

Check 5U1

LVDS IC

Check Logic B’d

Troubleshooting

Samsung Electronics 6-3

6-3 Checking the Board (Unit)

Troubleshooting

6-4 Samsung Electronics

6-4 50” HD D1.0 Logic Main Board T/S

If the PDP unit and the logic board operates properly, the operation LED of Figure 1 would blink at about

1 second interval.

If the unit is out of order, check the status of the operation LED through eye-inspection first. If the behavior of the operation LED is different from that of normal state, you have to replace the board. To check the trouble on the board, complete the following logic board test procedures described below.

Required testing equipment : - Oscilloscope (digital 400 MHz with more than 3 channels)

- Multi-meter

Other equipment : - DC power supply (5V: 1EA)

- Sub-PCB ASS'Y for JIG: 1 EA

① First, perform eye-inspection and short-circuit inspection for the power stage of the target logic

board. Then, perform the following tests on the board in sequence if no problem has been found.

② Replace the (Serial EEPROM) on the logic board with the Test EERPOM.

Change the clock setting of the logic board to internal. (Refer to the configuration procedures in the next page) If the Test EEPROM is not available, perform the tests by installing key scan and set the address

number 9F to 00.

➂ Implement 5V to the LD1, and check if the LED on the left-top of the board blinks at about one

second intervals.

➃ If the LED blinks too fast or the LED is not turned on, it means that the LOGIC board is not operating

properly.

➄ If no problem is found in the above step, connect sub-PCB to check the logic output. Then measure

the output waveform of the sub-PCB, and compare it with the appended waveform in normal state.

Record the test result (OK or NG).

➅ Check drive Y s/w , drive X s/w , and address signals in that order. ⑦ Set probe 1 of the oscilloscope to the trigger signal, and connect it to TP105 on the logic board. ➇ Set the oscilloscope to 2ms/div. After adjusting probe 2 to 5V/div, check the output signal. ⑨ After T/S, turn off the power supply, and disconnect the connector. ➉ Record the test result on the test sheet.