LG 50PC1DR - - 50" Plasma TV Bedienungsanleitung

Plasma Display Panel Troubleshooting - 2007

Troubleshooting

50PC1DR

Plasma Display Panel Troubleshooting - 2007

Troubleshooting

•Switch Mode Power Supply

•Y SUS Board

•Z SUS Board

•X Drive Boards

Overview of Topics to be

Discussed

Plasma Display Panel Troubleshooting - 2007

Safety & Handling Regulations

1. Check the appearance of Panel and boards.

2. Check the model label. Verify model names and board model matches.

3. Check details of defective condition and history.

Ex) COF long 2-1 fail, address 1 line open, Y b/d trouble, Mal-discharge on screen.

1. Approximately 10 minute pre-run time is required before adjustment.

2. Do not exceed Higher voltage than is required for the product.

3. Be cautious of electric shock from the PDP module since the PDP module uses high voltage, and it is

recommended that you should not touch the drive circuits for at least one minute because of residual

current stored.

4. Circuit drive has c-mos circuits which should be protected from static electricity.

5. The PDP Module must be carried by two people.

6. Be careful of short circuit when measuring voltage.

7. Be cautious of screws and other metal objects to prevent short in circuitry.

Checking Point before Requesting MODULE Repair

Safety Rules PLASMA Overview Troubleshooting

Plasma Display Panel Troubleshooting - 2007

Switch Mode Power Supply Troubleshooting

This Section of the Presentation will cover troubleshooting the Switch Mode Power Supply for the Single

Scan Plasma. Upon completion of the section the technician will have a better understanding of the operation

of the Power Supply circuit and will be able to locate voltage and test points needed for troubleshooting and

alignments.

•DC Voltages developed on the SMPS

•Adjustments VA, VS, and 5V DC

• Always refer to the sticker located in the upper right side of the PDP for the correct voltage levels

for the DC 5v, VA, VS, V SET UP, -VY, VSC, and Z Bias as they will vary from Panel to Panel.

V SET_UP VSC Z_BIAS

-VY

Plasma Display Panel Troubleshooting - 2007

•Define Look at the symptom carefully and determine what circuits could be

causing the failure. Use your senses Sight, Smell, Touch and Hearing. Look for

burned parts and check for possible overheated components. Capacitors will

sometimes leak dielectric material and give off a distinct odor. Frequency of power

supplies will change with the load, or listen for relay closing etc.

• Localize After carefully checking the symptom and determining the circuits to

be checked and after giving a thorough examination using your senses the first check

should always be the DC Supply voltages to those circuits under test. Always confirm

the Supplies are not only the proper level but be sure they are noise free. If the

supplies are missing check the resistance for possible short circuits.

•Isolate To further isolate the failure check for the proper waveforms with the

Oscilloscope to make a final determination of the failure. Look for correct Amplitude

and Timing of the signals also check for the proper Duty Cycle of the signals.

Sometimes “glitches” or “road bumps” will be an indication of an eminent failure.

• Correct The final step is to correct the problem. Be careful of ESD and make

sure to check the DC Supplies for proper levels. Make all necessary adjustments

and lastly always perform a Safety AC Leakage Test before returning the product

back to the Customer.

Troubleshooting Steps

Plasma Display Panel Troubleshooting - 2007

SMPS Operating Modes

•Deep Sleep Mode - Guide Plus not programmed or Cable Card not installed

and set is plugged in and turned off. The SMPS outputs S 5v (Standby). Guide Plus has been

programmed the set will remain in Standby Mode when turned off for approximately 2 hours and

go into Deep Sleep Mode. The unit can be taken out of DS Mode as needed for TVGOS Data.

•Standby Operation - Guide Plus has been programmed or a Cable Card is

installed and unit is powered off the SMPS will output 19v,12v, 6v, 5vS, and 3.3v Supplies.

•Full Power On - SMPS outputting all of the Standby Voltages and the

VA, VS, and 5v DC, set in full operation.

Troubleshooting

Power Sequence

• AC Cord Plugged in – Standby 5v

• AC Detect sent from the Power Board Pin1 of P800 to the Digital Board. Needed to enable the

Micro Processor to output the RL-ON Signal to turn on the SMPS.

• Digital Board sends RL-ON to P800 Pin 2 to cause Controller IC U701 on the Power Board to

turn on the Relay Drive Transistors Q701 and Q702 closing the Relays RL101 and RL102 turning

on the 3.3V, 5V, 6V, 12V, and 19V supplies.

• VS-ON applied from the Digital Board to the Power Board on connector P800 Pin 5 used to turn

on the VA, and VS Supplies

• 5V-M Sent from the Digital Board to the Power Board to turn on 5V-DC.

• 5V-D is sent from the Digital Board through P800 Pin 6 and used to bring the Power Supply out of

Deep Sleep Mode.

Plasma Display Panel Troubleshooting - 2007

Switch Mode Power Supply (SMPS) Voltages

•VS196v used to drive the Horizontal Grid Voltage, Y SUS, and Z SUS. Measured from pins 8, 9,

and 10 of connector P805 to chassis ground. Adjusted at VR951

•VA

60v used to drive the Vertical Grid Voltage, X Boards and in the IPM Circuits to develop Y and Z

Drive waveforms. Measured from pins 1 and 2 of connector P805 to chassis ground. Adjusted at

VR901

•5v.DC

Used to develop bias voltages for the circuits on the Y SUS, Z SUS, X, and Control Boards.

Measured from pins 1 and 2 of connector P804 to chassis ground.

•3.3v

. Standby voltage applied to the Analog, and Digital Boards to Bias the Signal and Control

circuits. Measured at connector P803 at pins 1 and 2. to chassis ground. Adjusted at VR221.

•19v

Applied to the Analog Board and used for the Audio Output Supply, present in standby.

Measured at P802 pins 1 and 2 to chassis ground.

•12v

Used for supplying low voltage regulators on the Digital and Analog Boards, present in standby.

Measured at P803 pins 9 and 10 to chassis ground.

•6v

Applied to the Digital Board used for the signal processing circuits present in standby. Measured

at P803 pins 5 and 6 to chassis ground.

•S5v

Standby 5 volts at P800 pin 3 applied to the Digital Board.

•VS-ON

Switched 5 volts at P800 pin 5 present after power up to switch on the VA, VS, and 5V on

the Power Board from the Digital Board.

•5v-DSwitched 5v used to bring the Power Supply out of Deep Sleep Mode.

•5V-M

Needed to turn on the 5V-DC Supply.

Troubleshooting

Plasma Display Panel Troubleshooting - 2007

Power Supply

Standby Circuit

VS Adjust VA

Adjust

3.3v

Adjust

P802 P803 P800

Troubleshooting

19v Audio Supply

12V,6V, 5V and

3.3V Source

VA Source

VS Source

Control IC

AC Input Circuit

380 Volt Supply

Plasma Display Panel Troubleshooting - 2007

Power Supply

Low Voltage Connectors

P800

1) AC-D

2) RL-ON

3) S-5V

4) GND

5) VS-ON

6) 5V-D

7) M5V-ON

8) S-5V

9) GND

10) NC

11) 6V

12) N.C

13) 3.3ON

P800

PIN1

P803

PIN 1

P803

1) 3.3V

2) 3.3V

3) GND

4) GND

5) 6V

6) 6V

7) GND

8) GND

9) 12V

10) 12V

11) GND

12) GND

P802

PIN 1

P802

1) 19V

2) 19V

3) GND

4) GND

5) 6V

6) GND

7) 3.3V

8) GND

9) 12V

10) GND

Troubleshooting

Plasma Display Panel Troubleshooting - 2007

TH01

120VAC

Power Supply Voltage Distribution Troubleshooting

INPUT

Circuit

Relay

RL101

Relay

RL102

D101

D102 D501D506

U701

Low Voltage

Standby Power

Supply

P800

P803

P802

D703 D704

F101

R606

R607

HS1

HS2

L601

Q607

Q606

Q601

Q602

D602

D601

380V

C602 C603

D502

R747

R745

HS3

PCs

T902

U851

U601 Control

IC S-5V

Standby

Regulator

T112

R162

U151

R870

U501

AC Input

T901

19V

T801

U801

Q854

Q855

Q151

L851

C855

HS4

PC901

Q801

R963

12V

HS6

T501

3.3V

D951

D952

D953

D271

D261

Q252

D251

Q281

Q701

Q702 D202

U261

Q223

D221

S-5V

AC DETECT

RL- ON

VS-ON

3.3v

5V-D

5V-M

S-5V

TH02

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