Samsung F31A, PS50Q91XEC, PS50Q91HX Service Manual

SGS0WHOHYLVLRQ FRQWHQWV

1. Precaution

2. Product Specification

3. Disassembly & Reassembly

4. Troubleshooting

5. Exploded View & Part List

6. Wiring Diagram

7. Schematic Diagram

VHUYLFH

Pdqxdo

PS-50Q91H

SGS0WHOHYLVLRQ

Fkdvvlv = I64D+SbHxurshbKG,bFdood# Prgho = SV83T<4K[2[HF

Refer to the service manual in the GSPN (see the rear cover) for the more information.

This Service Manual is a property of Samsung Electronics Co.,Ltd. Any unauthorized use of Manual can be punished under applicable International and/or domestic law.

Printed in Korea

AA82-04398A

Area Web Site North America service.samsungportal.com Latin America latin.samsungportal.com CIS cis.samsungportal.com Europe europe.samsungportal.com China china.samsungportal.com Asia asia.samsungportal.com Mideast & Africa mea.samsungportal.com

GSPN (Global Service Partner Network)

Table of Contents

Chapter 1 Precaution

■ 1-1 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

■ 1-2 Servicing Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

■ 1-3 Static Electricity Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

■ 1-4 Installation Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

Chapter 2 Product Specification

■ 2-1 Product Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

■ 2-2 Specifications Analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

■ 2-3 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4

Chapter 3 Disassembly & Reassembly

■ 3-1 Overhaul Disassembly & Reassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Chapter 4 Troubleshooting

■ 4-1 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

■ 4-2 Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16

■ 4-3 Upgrade . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32

Chapter 5 Exploded View & Part List

■ 5-1 PS50Q91HX/XEC Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

■ 5-2 PS50Q91HX/XEC Service Item . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3

Chapter 6 Wiring Diagram

■ 6-1 Overall Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Chapter 7 Schematic Diagram

■ 7-1 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

■ 7-2 Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

1. Make sure all protective devices are properly installed including non-metallic handles and compartment covers when installing or re-installing the chassis or chassis assemblies.

2. Make sure that no gaps exist between the cabinets for children to insert their fingers in to prevent children from receiving electric shocks. Gaps mentioned above include ventilation holes between the PDP module and the cabinet mask, and the improper installation of the rear cabinet.

Errors may occur when the resistance is below 1.0 ㏁ or over 5.2 ㏁.

In these cases, make sure that the device is repaired before sending it back to the customer.

3. Check for Electricity Leakage (Figure 1-1) Warning: Do not use an insulated transformer for checking the leakage. Use only those current leakage testers or mirroring systems that comply with ANSIC 101.1 and the Underwriter Laboratory's specifications (UL1410,

59.7).

Fig. 1-1 AC Leakage Test

4. Ahigh voltage is maintained within the specified limits using safety parts, calibration and tolerances. When voltage exceeds the specified limits, check each special part.

5. Warning for Engineering Changes: Never make any changes or additions to the circuit design or the internal part for this product. Ex: Do not add any audio or video accessory connectors. This might cause physical damage. Furthermore, any changes or additions to the original design/engineering will invalidate the warranty.

6. Warning - Hot Chassis: Some TV chassis are directly connected to one end of the AC power cord for electrical reasons. Without insulated transformers, the product can only be repaired safely when the chassis is connected to the earth end of the AC power source.

To make sure the AC power cord is properly connected, follow the instructions below. Use the voltmeter to measure the voltage between the chassis and the earth ground. If the measurement is over 1.0V, unplug the AC power cord and change the polarity before reinserting it. Measure the voltage between the chassis and the ground again.

7. Some TV chassis are shipped with an additional secondary grounding system. The secondary system is adjacent to the AC power line. These two grounding systems are separated in the circuit using an unbreakable/unchangeable insulation material.

8. When any parts, material or wiring appear overheated or damaged, replace them with new immediately. When any damage or overheating is detected, correct this immediately and make a regular check of possible errors.

9. Check for the original shape of the lead, especially that of the antenna wiring, any sharp edges, the AC power and the high voltage power. Carefully check if the wiring is too tight, incorrectly placed or loose. Never change the space between the part and the printed circuit board. Check the AC power cord for possible damages. Keep the part or the lead away from any heat-emitting materials.

Precaution

Samsung Electronics 1-1

To avoid possible damage, electric shocks or exposure to radiation, follow the instructions below with regard to safety, installation, service and ESD.

1. Precaution

1-1 Safety Precautions

(READING SHOULD

DEVICE UNDER

TEST

EXPOSED METAL

2-WIRE CORD

ALSO TEST WITH

PLUG REVERSED (USING AC ADAPTER PLUG AS REQUIRED)

TEST ALL

SURFACES

LEAKAGE CURRENT

TESTER

NOT BE ABOVE

0.5mA)

EARTH

GROUND

10. Safety Indication: Some electrical circuits or device related materials require special attention to their safety features, which cannot be viewed by the naked eye. If an original part is replaced with another irregular one, the safety or protective features will be lost even if the new one has a higher voltage or more watts.

Critical safety parts should be bracketed with ( ). Use only regular parts for replacements (in particular, flame resistance and dielectric strength specifications). Irregular parts or materials may cause electric shock or fire.

Precaution

1-2 Samsung Electronics

1. The service instructions are printed on the cabinet, and should be followed by any service personnel.

2. Make sure to unplug the AC power cord from the power source before starting any repairs. (a) Remove or re-install parts or assemblies. (b) Disconnect the electric plug or connector, if any. (c) Connect the test part in parallel with the electrolytic capacitor.

3. Some parts are placed at a higher position than the printed board. Insulated tubes or tapes are used for this purpose. The internal wiring is clamped using buckles to avoid contact with heat emitting parts. These parts are installed back to their original position.

4. After the repair, make sure to check if the screws, parts or cables are properly installed. Make sure no damage is caused to the repaired part and its surroundings.

5. Check for insulation between the blade of the AC plug and that of any conductive materials (i.e. the metal panel, input terminal, earphone jack, etc).

6. Insulation Check Process: Unplug the power cord from the AC source and turn the switch on. Connect the insulating resistance meter (500v) to the AC plug blade.

The insulating resistance between the blade of the AC plug and that of the conductive material should be more

than 1 ㏁.

7. Any B+ interlock should not be damaged. If the metal heat sink is not properly installed, no connection to the AC power should be made.

8. Make sure the grounding lead of the tester is connected to the chassis ground before connecting to the positive lead. The ground lead of the tester should be removed last.

9. Beware of risks of any current leakage coming into contact with the high-capacity capacitor.

10. The sharp edges of the metal material may cause physical damage, so protect yourself by wearing gloves during the repair.

11. Due to the nature of plasma display panels, partial afterimages may appear if a still picture is displayed on the screen for a long period of time. This is caused by brightness deterioration due to the storage effect of the panel, and to prevent this from happening, we recommend that the brightness and contrast are reduced. (e.g.) Contrast: 25, Brightness: 50

Precaution

Samsung Electronics 1-3

Warning 1: First carefully read the "Safety Instruction" in this service manual.

When there is a conflict between the service and the safety instructions, follow the safety instruction at all times.

Warning 2: Any electrolytic capacitor with the wrong polarity will explode.

1-2 Servicing Precautions

1-3 Static Electricity Precautions

1. Some semi-conductive ("solid state") devices are vulnerable to static electricity. These devices are known as ESD. ESD includes the integrated circuit and the field effect transistor. To avoid any materials damage from electrostatic shock, follow the instructions described below.

2. Remove any static electricity from your body by connecting the earth ground before handling any semi-conductive parts or assemblies. Alternatively, wear a dischargeable wrist-belt. (Make sure to remove any static electricity before connecting the power source - this is a safety instruction for avoiding electric shock)

3. Remove the ESD assembly and place it on a conductive surface such as aluminum foil to prevent accumulating static electricity.

4. Do not use any Freon-based chemicals. Such chemicals will generate static electricity that causes damage to the ESD.

5. Use only grounded-tip irons for soldering purposes.

6. Use only anti-static solder removal devices. Most solder removal devices do not support an anti-static feature. Asolder removal device without an anti-static feature can store enough static electricity to cause damage to the ESD.

7. Do not remove the ESD from the protective box until the replacement is ready. Most ESD replacements are covered with lead, which will cause a short to the entire unit due to the conductive foam, aluminum foil or other conductive materials.

8. Remove the protective material from the ESD replacement lead immediately after connecting it to the chassis or circuit assembly.

9. Take extreme caution in handling any uncovered ESD replacements. Actions such as brushing clothes or lifting your leg from the carpet floor can generate enough static electricity to damage the ESD.

Precaution

1-4 Samsung Electronics

CAUTION

These servicing instructions are for use by qualified service personnel only. To reduce the risk of electric shock do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so.

Precaution

Samsung Electronics 1-5

1-4 Installation Precautions

1. For safety reasons, more than two people are required for carrying the product.

2. Keep the power cord away from any heat emitting devices, as a melted covering may cause fire or electric shock.

3. Do not place the product in areas with poor ventilation such as a bookshelf or closet. The increased internal temperature may cause fire.

4. Bend the external antenna cable when connecting it to the product. This is a measure to protect it from being exposed to moisture. Otherwise, it may cause a fire or electric shock.

5. Make sure to turn the power off and unplug the power cord from the outlet before repositioning the product. Also check the antenna cable or the external connectors if they are fully unplugged. Damage to the cord may cause fire or electric shock.

6. Keep the antenna far away from any high-voltage cables and install it firmly. Contact with the high-voltage cable or the antenna falling over may cause fire or electric shock.

7. When connecting the RF antenna, check for a DTV receiving system and install a separate DTV reception antenna for areas with no DTV signal.

8. When installing the product, leave enough space (4") between the product and the wall for ventilation purposes. Arise in temperature within the product may cause fire.

9. When moving a PDP with removable speakers, detach the speakers first before moving the main body. Moving the PDP main body without separating the speakers may cause the speakers to detach, possibly causing damage or injury.

1-6 Samsung Electronics

MEMO

Product Specification

Samsung Electronics 2-1

2. Product Specification

2-1 Product Specification

Features

Block Specification Major IC Remark

RF Tuner TCPW3001PD32S SEMCO

PDP Module Samsung SDI W2A 42"HD/50"HD SAMSUNG SDI

Power Input Voltage: AC 100~240V, 50/60Hz

Video

Scaler

SVP-UX68

Video Decoder

Sound

Sound AMP NTP3000 Neo Fidelity

Audio CODEC SGTV5810

Cabinet Q9 Design

Specification

Model PS-42Q91H PS-50Q91H

Screen Size 42 Inches (16:9) 50 Inches (16:9)

Dimensions (WxHxD) 1055 x 757 x 316 mm (With stand) 1231 x 849 x 316 mm (With stand)

Weight 34 kg (With stand) 44 kg (With stand)

Voltage AC 100~240V, 50/60Hz Colour System PAL, SECAM, NTSC4.43, NTSC 3.58 Sound System BG, DK, I, M

PC Resolution 1024 x 768 @ 60Hz 1360 x 768 @ 60Hz

ANTENNAinput AIR IN (75Ωunbalanced)

VIDEO input

SCART1, SCART2

AV (Side), S-VIDEO (Side)

COMPONENT IN (480i/P, 576i/P, 720P, 1080i)

PC IN (MINI D-SUB 15P)

HDMI1

HDMI2 (DVI IN)

HDMI3 (Side)

AUDIO input

SCART1, SCART2

AV (Side), S-VIDEO (Side)

Component

DVI

Audio Output AUDIO (L/R)

Speaker Output 10W + 10W 15W + 15W

New Features Anynet+

Product Specification

2-2 Samsung Electronics

■■

New Features explanation

- Anynet+ : Anynet+ is an AV network system that enables you to control all connected Samsung AV devices with your Samsung TV's remote.

To directly connect to TV

Anynet+ Device 1 Anynet+ Device 2 Anynet+ Device 3

Connect the [HDMI 1], [HDMI 2] or [HDMI 3] jack on the TV and the HDMI OUT jack of the corresponding Anynet+ device using the HDMI cable.

HDMI Cable

To connect to Home Theater

Anynet+ Device 1 Anynet+ Device 2

HDMI Cable

Home Theater

HDMI Cable

Connect only one receiver.

You can connect an Anynet+ device using the HDMI cable. Some HDMI cables may not support

Anynet+ functions. Anynet+ works when the AV device supporting Anynet+ is in the Standby or On status.

Anynet+ supports up to 8 AV devices in total.

HDMI Cable

Anynet+ Device 3

HDMI Cable

1 Connect the [HDMI 1],

[HDMI 2] or [HDMI 3] jack on the TV and the HDMI OUT jack of the corresponding Anynet+ device using the HDMI cable.

2 Connect the HDMI IN jack

of the home theater and the HDMI OUT jack of the corresponding Anynet+ device using the HDMI cable.

Product Specification

Samsung Electronics 2-3

2-2 Specifications Analysis

Model PS-42Q91H (Calla-42HD) PS-50Q91H (Calla-50HD) PS-42P7HD (Alps-42HD)

Design

Basic

Display Type PDP TV PDP TV PDP TV

Built-In Tuner O O O

PC Resolution 1024 x 768 @ 60Hz 1360 x 768 @ 60Hz 1024 x 768 @75Hz

PDP Module W2A W2A V5.1

Screen Size 42 inches 50 inches 42 inches

Aspect Ratio 16 : 9 16 : 9 16 : 9

Dimensions (WxHxD) 1055 x 757 x 316 mm (With stand) 1231 x 849 x 316 mm (With stand) 1055 x 775 x 341 mm (With stand)

Weight 34 kg (With stand) 44 kg (With stand) 40.4 kg (With stand)

Picture

Brightness 1,500 Cd/m2 1,300 Cd/m2 1,100 Cd/m2

Contrast Ratio 10000:1 10000:1 10000:1

Image Enhacer FBE2X FBE2X FBE

Audio

Equalizer O O O

Auto Volume O O O

Surround Sound SRS TruSurround SRS TruSurround SRS TruSurround

Speaker Output 10 W + 10 W 15 W + 15 W 15 W + 15 W

Speaker 2CH 2.2CH (2Way) Included

Features

PIP O O O

Double Screen O O X

Caption X X X

Still Image O O O My Color Control O O X Color Weakness X X X

Energy Saving O O O

Screen Burn Protection O O O

Connections

Antenna 1 Input 1 Input 1 Input

CVBS 1AV(Side) 1AV(Side) 1AV(Rear)

S-Video O O 1 Input

Component(Y/PB/PR) 1 Input 1 Input 1 Input

PC(D-SUB) 1 Input 1 Input 1 Input

DVI O O O HDMI 3 Input 3 Input 2 Input Scart 2 Input 2 Input 2 Input

Optical O O O

Coaxial X X X

※○: application, X: non-application

※ For the power supply and power consumption, refer to the label attached to the product.

Product Specification

2-4 Samsung Electronics

2-3 Accessories

Accessories Item Item code Remark

SuppliedAccessories

Remote Control

Batteries

BN59-00602A

4301-000103

Samsung Service center

Power Cord 3903-000145

Owner's Instructions BN68-01171Q

Warranty Card

Registration Card

Safety Guide Manual

BN68-00514C

AA68-03575A AA68-03242E

Cloth-Clean BN63-01798A

Ferrite Core for

Earphone/Power Cord

3301-001110

Ferrite Core for

S-VIDEO/Power Cord

3301-001305

Cover-Bottom Screws (2ea)

BN63-03055A

6003-001621

Accessories that canbe purchased

additionally

S-VIDEO Cable

1200mm

BN39-00149A

Electronics Store/

Internal shopping mall

HDMI Cable

3000mm

BN39-00641A

HDMI/DVI cable

3000mm

BN39-00643A

Component Cables (RCA)

1500mm

BN39-00279A

Scart Cable None

Product Specification

Samsung Electronics 2-5

Accessories Item Item code Remark

Accessories that canbe purchased

additionally

PC Cable

1830mm

BN39-00115A

Electronics Store/

Internal shopping mall

PC Audio Cable

2000mm

BN39-00061B

Antenna Cable

3000mm

BN39-00333A

2-6 Samsung Electronics

MEMO

Troubleshooting

Samsung Electronics 4-1

4-1-1 First Checklist for Troubleshooting

1. Check the various cable connections first.

- Check to see if there is a burnt or damaged cable.

- Check to see if there is a disconnected or loose cable connection.

- Check to see if the cables are connected according to the connection diagram.

2. Check the power input to the Main Board.

3. Check the voltage in and out between the SMPS ↔ Main Board, between the SMPS ↔ X, Y Main Board, and between the

Logic Boards.

4. Troubleshooting

4-1 Troubleshooting

Troubleshooting

4-2 Samsung Electronics

4-1-2 Checkpoints by Error Mode

■

No Power

Symptom

- The LEDs on the front panel do not work when connecting the power cord.

- The SMPS relay does not work when connecting the power cord.

- The unit appears to be dead.

Major Checklist

The SMPS relay or the LEDs on the front panel does not work when connecting the power cord if the cables are improperly connected or the Main Board or SMPS is not functioning. In this case, check the following:

- Check the internal cable connection.

- Check the fuses.

- Check the output voltages of the SMPS.

- Replace the Main Board.

Troubleshooting

Procedures

Is the AC IN socket connector and

the SMPS CN800 connected?

Insert the AC in connector and the

SMPS CN800 connector

Is the Fuse (F801S) of the SMPS

Power Input Part blown?

Replace Fuse (F801S)

Replace the SMPS

SMPS CN801

Pin 3 : STB 5V

Pin 2 PS-ON : Check to see if it is 0V

Replace the Main Board

①

②

Yes

Troubleshooting

Samsung Electronics 4-3

■

When the unit is repeatedly turning on and off

Symptom - The SMPS relay is repeatedly turning on and off.

Major Checklist

In general, the SMPS relay repeatedly turns on and off by the protection function due to a defect on a board connected to the SMPS.

- Disconnect all cables from the SMPS, operate the SMPS alone and check if the SMPS works properly and if each voltage output is correct.

- If the symptom continues even when SMPS is operated alone, replace the SMPS.

- If the symptom is not observed when operating the SMPS alone, find any defective assemblies by connecting the cables one by one.

Troubleshooting

Procedures

Caution

WHEN SEPARATING AND CONNECTING THE CABLES SUCH AS CN810, CN809, CN808, CN807 OF THE MAIN SMPS, CN4701 OF THE X MAIN BOARD, AND CN5707 OF THE Y MAIN BOARD, A SPARK MAY BE GENERATED BY THE ELECTRIC CHARGE OF THE HIGH CAPACITY CAPACITOR. THEREFORE, WAIT SOME TIME AFTER DISCONNECTING THE POWER CORD FROM THE UNIT.

Does the symptom continue when

connecting the power after removing

CN810 from the SMPS?

Replace the Y Main Board

Does the symptom continue when

connecting the power after removing

CN809 from the SMPS?

Replace the X Main Board

Replace the Logic Board

Does the symptom continue when

connecting the power after removing

CN807 from the SMPS?

Replace the SMPS

①

②

③

Yes

Troubleshooting

4-4 Samsung Electronics

■

No Picture (When audio is normal)

Symptom - Audio is normal but no picture is displayed on the screen.

Major Checklist

- This may happen when the Main Board is functioning but the X, Y Main Board, Logic Board, or Y Buffer Boards are not.

- The output voltage of the Main SMPS.

- This may happen when the LVDS cable connecting the Main Board and the Logic Board is disconnected.

Troubleshooting

Procedures

Caution

Are the Vs and Va voltages normal after

removing all cables from the SMPS?

(CN810, CN809, CN808, CN807)

Replace the SMPS

Yes

Did problem improve?

Replace the Y Main Board

Replace the X Main Board

Replace the Logic Board

Replace the Y Scan Board

Yes

CN810

CN809

CN808

CN807

Troubleshooting

Samsung Electronics 4-5

■■

No Sound

Symptom - Video is normal but there is no sound.

Major Checklist

- When the speaker connectors are disconnected or damaged.

- When the sound processing part of the Main Board is not functioning.

- Speaker defect.

Troubleshooting

Procedures

Is the cable connection between the

Main Board and the speaker

properly connected?

Connect the cable properly or

replace the cable, if necessary.

Is the output voltage of SMPS normal?

(CN801 #13)

Replace the SMPS

Replace the Main Board

Is the speaker output terminal

of the Main Board normal?

Replace the Speaker

①

②

③

Yes

Troubleshooting

4-6 Samsung Electronics

■

No Video

Symptom - A normal/cable network analog broadcast screen is blank or abnormal but OSD is OK.

Major Checklist

- Check the antenna connection settings (Air: NTSC / ATSC, Cable: NTSC)

- Check the CVBS cable connection.

- Check the power input of the Main board.

Troubleshooting

Procedures

Is the antenna connection setting

properly configured?

Configure properly

Replace the SMPS

Check CN1101 pin2 for +33V

Replace the Main Board

①

Yes

Troubleshooting

Samsung Electronics 4-7

■

SMPS Troubleshooting

Power ON

STD_5V

Normal PS-ON

Abnormal

Normal VS-ON

Abnormal

Multi

Abnormal

Check the ICB802, DB864, FB801, F801S

Check the SUB2, QX801,QX802

Check the

Abnormal

Check the SUB1,QS801,QS802

5.3V : ICX808, QX806 12V : ICX803 VG : ICX805 18Vamp : ICX804

Normal

Check the Other board (Image Board or Driver Board) or Cable.

Troubleshooting

4-8 Samsung Electronics

Condition Name Description Related Board

No Voltage Output Operating Voltage don't exist PSU

No Display Operating Voltage exist, but an Image doesn't exist on screen Y-MAIN, X-MAIN, Logic Main, Cable

Abnormal Display Abnormal Image (not open or short) is no screen Y-MAIN, X-MAIN, Logic Main

Sustain Open Some horizontal lines don't exist on screen Scan Buffer, FPC of X/Y

Sustain Short Some horizontal lines appear to be linked on screen Scan Buffer, FPC of X/Y

Address Open Some vertical lines don't exist on screen Logic Main, Logic Buffer, TCP

Address Short Some vertical lines appear to be linked on screen Logic Main, Logic Buffer, TCP

■

Drive Board Troubleshooting

1) Troubleshooting Summary

Troubleshooting

Samsung Electronics 4-9

2) Troubleshooting Procedure in Abnormal Conditions

① No Display

▶ No Display is related with Y-MAIN, X-MAIN, Logic Main and so on.

This page shows you how to check the boards, and the following pages show you how to find the defective board.

No Display

[ Logic Main ]

LED Blinks

Check the LED

YES NO

Check if internal is

Check if any address

data output is detected

Default Black

[ Y-MAIN ]

Check necessary points

[ Logic Main ]

Check if power is supplied

YES NO

operation

MICOM operation

Check the ASIC

Control Signal output

Check if the data

and control signals

between DDR & ASIC

( 5V, 3.3V )

Check the

are normal

[ X-MAIN ]

Check necessary points

Check the

power connectivity

Check the FUSE

Check the

input voltage

If the input voltage is

abnormal, replace the

PSU and check it

again as this indicates

a PSU output error

[ X-MAIN ]

Check several points

FUSE

FET/

DIODE

X-MAIN

Normal State

OPEN

Replace the Board

SHORT

Replace the Board

F5001 for VDD F5002 for Vs F5004 for VCC F5005 for OUT_L

Q5009~Q5021 D5005, D5007 D5008

[ Y-MAIN ]

Check several points

FUSE

FET/

DIODE

Y-MAIN

Normal State

OPEN

SHORT

Replace the Board

F4001 for VCC F4002 for Vs F4004 for VDD F4005 for Ve

Q4002~Q4003 Q4011~Q4016 D4004 D4006~D4008

+ 56 hidden pages