SAMSUNG SPM4388PFSGEX Service Manual

PROJECTION TV RECEIVER

Chassis : SPT51A (VERSION1) Model: SPM5288PF

SPM5288PTR SPM4388PF SPM4388PTR

PROJECTION TV RECEIVER CONTENTS

Precautions Reference Information Specifications Disassembly and Reassembly Alignment and Adjustment Troubleshooting Exploded View and Parts List Areas and Option Specification Electric Parts List Block Diagrams Wiring Diagram Schematic Diagrams

10.

11. 12

ELECTRONICS

Samsung Electronics Co., Ltd. SEP 1997 Printed in Korea

3SPT51A-8801

1. Precautions

Follow these safety, servicing and ESD precautions to prevent damage and protect against potential hazards such as electrical shock and X-rays.

1-1 Safety Precautions

1 . Be sure that all of the built-in protective

devices are replaced. Restore any missing protective shields.

2 . When reinstalling the chassis and its

assemblies, be sure to restore all protective devices, including: nonmetallic control knobs and compartment covers.

3 . Make sure that there are no cabinet

openings through which people-particularly children--might insert fingers and contact dangerous voltages. Such openings include the spacing between the picture tube and the cabinet mask, excessively wide cabinet ventilation slots, and improperly fitted back covers.

If the measured resistance is less than 1.0 megohm or greater than 5.2 megohms, an abnormality exists that must be corrected before the unit is returned to the customer.

4 . Leakage Current Hot Check (Figure 1-1):

Warning: Do not use an isolation transformer during this test. Use a leakagecurrent tester or a metering system that complies with American National Standards Institute (ANSI C101.1, Leakage Current for

A p p l i a n c e s ) , and Underwriters Laboratories (UL Publication UL1410, 59.7).

6 . Antenna Cold Check:

With the unit's AC plug disconnected from the AC source, connect an electrical jumper across the two AC prongs. Connect one lead of the ohmmeter to an AC prong. Connect the other lead to the coaxial connector.

7 . X-ray Limits:

The picture tube is especially designed to prohibit X-ray emissions. To ensure continued X-ray protection, replace the picture tube only with one that is the same type as the original. Carefully reinstall the picture tube shields and mounting hardware; these also provide X-ray p r o t e c t i o n .

Fig. 1-1 AC Leakage Test

5 . With the unit completely reassembled, plug

the AC line cord directly into the power outlet. With the unit's AC switch first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit, etc.) and all exposed metal parts, including: antennas, handle brackets, metal cabinets, screwheads and control shafts. The current measured should not exceed 0.5 milliamp. Reverse the power-plug prongs in the AC outlet and repeat the test.

8 . High Voltage Limits:

High voltage must be measured each time servicing is done on the B+, horizontal deflection or high voltage circuits. Correct operation of the X-ray protection circuits must be reconfirmed whenever they are serviced. (X-ray protection circuits also may be called "horizontal disable" or "holdd o w n " . )

Heed the high voltage limits. These include the X–ray Protection Specifications Label, a n d the Product Safety and X-ray Warning Note o n the service data schematic.

1-1Samsung Electronics

Precautions

1-1 Safety Precautions (Continued)

9 . High voltage is maintained within specified

limits by close-tolerance, safety-related components and adjustments. If the high voltage exceeds the specified limits, check

each of the special components.

1 0 . Design Alteration Warning:

Never alter or add to the mechanical or

electrical design of this unit. Example: Do not add auxiliary audio or video connectors. Such alterations might create a safety hazard. Also, any design changes

or additions will void the manufacturer's warranty.

1 1 . Hot Chassis Warning:

Some TV receiver chassis are electrically

connected directly to one conductor of the AC power cord. If an isolation transformer

is not used, these units may be safely serviced only if the AC power plug is inserted so that the chassis is connected to the ground side of the AC source.

To confirm that the AC power plug is

inserted correctly, do the following: Using an AC voltmeter, measure the voltage

between the chassis and a known earth ground. If the reading is greater than 1.0V, remove the AC power plug, reverse its polarity and reinsert. Re-measure the voltage between the chassis and ground.

1 2 . Some TV chassis are designed to operate

with 85 volts AC between chassis and

ground, regardless of the AC plug polarity.

These units can be safely serviced o n l y i f an isolation transformer inserted between the receiver and the power source.

1 5 . Observe the original lead dress,

especially near the following areas: Antenna wiring, sharp edges, and especially the AC and high voltage power supplies. Always inspect for pinched, out-of-place, or frayed wiring. Do not change the spacing between components and the printed circuit board. Check the AC power cord for damage. Make sure that leads and components do not touch thermally hot parts.

1 6 . Picture Tube Implosion Warning:

The picture tube in this receiver employs "integral implosion" protection. To ensure continued implosion protection, make sure that the replacement picture tube is the same as the original.

1 7 . Do not remove, install or handle the

picture tube without first putting on shatterproof goggles equipped with side shields. Never handle the picture tube by its neck. Some "in-line" picture tubes are equipped with a permanently attached deflection yoke; do not try to remove such "permanently attached" yokes from the picture tube.

1 8 . Product Safety Notice:

Some electrical and mechanical parts have special safety-related characteristics which might not be obvious from visual inspection. These safety features and the protection they give might be lost if the replacement component differs from the original--even if the replacement is rated for higher voltage, wattage, etc.

1 3 . Some TV chassis have a secondary

ground system in addition to the main chassis ground. This secondary ground

system is not isolated from the AC power line. The two ground systems are

electrically separated by insulating

material that must not be defeated or a l t e r e d .

1 4 . Components, parts and wiring that

appear to have overheated or that are

otherwise damaged should be replaced with parts that meet the original specifications. Always determine the

cause of damage or overheating, and

correct any potential hazards.

1-2 Samsung Electronics

Components that are critical for safety are indicated in the circuit diagram by shading, ( ) or ( ). Use replacement components that have the same ratings, especially for flame resistance and dielectric strength specifications. A replacement part that does not have the same safety characteristics as the original might create shock, fire or other hazards.

Precautions

1-2 Servicing Pre c a u t i o n s

W A R N I N G1 : First read the "Safety Precautions" section of this manual. If some unforeseen circumstance creates a conflict

between the servicing and safety precautions, always follow the safety precautions.

W A R N I N G2: An electrolytic capacitor installed with the wrong polarity might explode.

1 . Servicing precautions are printed on the

cabinet. Follow them.

2 . Always unplug the unit's AC power cord

from the AC power source before attempting to: (a) Remove or reinstall any component or assembly, (b) Disconnect an electrical plug or connector, (c) Connect a test component in parallel with an electrolytic capacitor.

3 . Some components are raised above the

printed circuit board for safety. An insulation tube or tape is sometimes used. The internal wiring is sometimes clamped to prevent contact with thermally hot components. Reinstall all such elements to their original position.

4 . After servicing, always check that the

screws, components and wiring have been correctly reinstalled. Make sure that the portion around the serviced part has not been damaged.

5 . Check the insulation between the blades of

the AC plug and accessible conductive parts (examples: metal panels, input terminals and earphone jacks).

6 . Insulation Checking Procedure: Disconnect

the power cord from the AC source and turn the power switch ON. Connect an insulation resistance meter (500V) to the blades of the AC plug.

The insulation resistance between each blade of the AC plug and accessible conductive parts (see above) should be greater than 1 megohm.

7 . Never defeat any of the B+ voltage

interlocks. Do not apply AC power to the unit (or any of its assemblies) unless all solid-state heat sinks are correctly installed.

8 . Always connect a test instrument's ground

lead to the instrument chassis ground before connecting the positive lead; always remove the instrument's ground lead last.

1-3 Precautions for Electrostatically Sensitive Devices (ESDs)

1 . Some semiconductor ("solid state") devices

are easily damaged by static electricity. Such components are called Electrostatically Sensitive Devices (ESDs); examples include integrated circuits and some field-effect transistors. The following techniques will reduce the occurrence of component damage caused by static electricity.

2 . Immediately before handling any

semiconductor components or assemblies, drain the electrostatic charge from your body by touching a known earth ground. Alternatively, wear a discharging wrist-strap device. (Be sure to remove it prior to applying power--this is an electric shock precaution.)

3 . After removing an ESD-equipped assembly,

place it on a conductive surface such as aluminum foil to prevent accumulation of electrostatic charge.

4 . Do not use freon-propelled chemicals.

These can generate electrical charges that damage ESDs.

5 . Use only a grounded-tip soldering iron

when soldering or unsoldering ESDs.

6 . Use only an anti-static solder removal

device. Many solder removal devices are not rated as "anti-static"; these can accumulate sufficient electrical charge to damage ESDs.

7 . Do not remove a replacement ESD from its

protective package until you are ready to install it. Most replacement ESDs are packaged with leads that are electrically shorted together by conductive foam, aluminum foil or other conductive m a t e r i a l s .

8 . Immediately before removing the protective

material from the leads of a replacement ESD, touch the protective material to the chassis or circuit assembly into which the device will be installed.

9 . Minimize body motions when handling

unpackaged replacement ESDs. Motions such as brushing clothes together, or lifting a foot from a carpeted floor can generate enough static electricity to damage an ESD.

Samsung Electronics

1-3

1-4 Samsung Electronics

2. Reference Information

2-1 IC Summary

Table 2-1 IC Summary

Loc No. IC111 IC201 IC202

IC203

IC204 IC205 IC206 IC207 IC208

IC301

No.

1 2 3

5 6 7 8 9

Specification TDA9815 TDA4566 TDA9160A

TDA4780

TDA4665 TDA9170 MC14577BP AN5342K TEA5114A TDA8350Q

Description VIF-PLL/DUAL FM-PLL/AM DEMODULATOR COLOUR TRANSIENT IMPROVEMENT PAL/NTSC/SECAM DECODER AND SYNC PROCESSOR

RGB VIDEO PROCESSOR

BASEBAND DELAY LINE YUV PICTURE IMPROVEMENT PROCESSOR DUAL VIDEO AMPLIFIERS VIDEO CONTOUR COLLECTION RGB SWITCHING VERTICAL DEFLECTION

Remarks

AUTOMATIC CUT-OFF CONTROL AND COMMA ADJUST

IC501 IC502

IC503 HC651 IC602 IC603 ICJ01 ICJ02 ICE01 ICE02 ICE03

12 13 14 15 16 17 18 19

TDA6101Q

STK4142•± UPC1853 TDA9840 SAA7283 MC4558C M65831P NJM3403AD UPC1406HA

VIDEO OUTPUT AMPLIFIER

AUDIO AMPLIFIER MATRIX SURROUND IC STEREO/DUAL SOUND PROCESSOR NICAM DECODER OP-AMPLIFIER DIGITAL ECHO QUAD OP-AMPLIFIER DUAL ATTENUATOR

NICAM PART NICAM PART KARAOKE PART KARAOKE PART KARAOKE PART

2-1Samsung Electronics

Reference Information

Table 2-1 IC Summary(Continued)

Loc No. IC701

IC702 IC703

IC704 IC801 IC901 ICT01 ICT02 ICP101 ICP102 ICP103 ICP201

No.

Specification

TC4053BP

KA2192

STR-S6709 RM130

SAA5281

TEA5114A

TDA9160A TDA9815 PAP101

SDA9187

Description

A/V SWITCHING IC

SMPS CONTROL MICOM

TELETEXT RGB SWITCHING PAL/NTSC/SECAM DECODER AND SYNC PROCESSOR VIF-PLL

IF PRE-AMP

PIP PROCESSOR

Remarks

A/V SWITCHING PART

POWER PART TELETEXT PART TELETEXT PART PIP PART PIP PART PIP PART PIP PART

ICP105

SDA9189

ICZ30

TEA5114A

ICZ31 ICZ202

74HC123P

HCZ03 HCZ04

STK391-020

HCZ05

Option: OSD Language

Loc No.

IC901

Specification

RM130ECP RM130ERP RM130EAP RM130EUP RM130ETP

PIP PROCESSOR

OSD/CONVERGENCE SWITCHING

DYNAMIC FOCUS

CONVERGENCE AMP

Table 2-2

Description

SSOM-130ECP SSOM-130ERP SSOM-130EAP SSOM-130EUP SSOM-130ATP

Remarks ENG/CHINA

ENG/RUS/HUN/POL ENG/ARABIC ENG/UGO/CHE/RUM ENG/TAI/MAL/IND

PIP PART

CONVERGENCE PART

2-2 Samsung Electronics

3. Specifications

MODEL

TUNING

SYSTEM COLOUR

SOUND

NICAM ANTENNA IMPEDANCE SCREEN SIZE POWER CONSUMPTION

REQUIREMENTS

FREQUENCY PROGRAMME CHANNEL SOUND OUTPUT

4388 5288

Frequency Synthesizer

PAL, SECAM, NTSC3.58, NTSC4.43

B/G, D/K, I,M

B/G,I

75 ohm unbalanced coaxial

109 cm 132 cm

275 watts 275 watts

Main voltage : 220V/230V/240V

Cover range : 100 - 260V

50/60Hz

100 channels

25 watts/ch. x 2 DIMENSIONS SET (W x D x H) TRANSMITTER WEIGHT SET

TRANSMITTER

Specifications are subject to change.

950 x 476 x 1247 (mm) 1168 x 589 x 1384 (mm)

64 x 234 x 20(mm)

63 Kg 73 Kg

140g (Including Batteries)

3-1Samsung Electronics

3-2 Samsung Electronics

Disassembly and Reassembly

Samsung Electronics 4-1

4. Disassembly and Reassembly

4-1 Screen Replacement for SPM-4388PF

1. Figures 4-1 through 4-6 show the disassembly steps.

2. To reassemble, repeat the sequence in reverse order.

Fig. 4-1 Remove 3 screws located on the bottom of the cover grill. Pull the grill forward to remove if from the mainframe.

Fig. 4-2 Remove 4 screws holding the door assembly.

Disassembly and Reassembly

4-2 Samsung Electronics

Fig. 4-3 Push the door assembly inside and lay it on the mainframe.

Fig. 4-4 Remove the 4 screws located below the mask-front.

Disassembly and Reassembly

Samsung Electronics 4-3

Fig. 4-5 Lift and remove the mask-front.

Fig. 4-6 Remove the bracket and replace the screen.

Disassembly and Reassembly

4-4 Samsung Electronics

Fig. 4-7 Pull and remove the 2 woofers from the cover grill.

Remove the 9 screws. Pull the cover grill from the mainframe.

Fig. 4-8 Remove 4 screws holding the door assembly.

1. Figures 4-7 through 4-10 show the disassembly steps.

2. Repeat the sequence in reverse order to reassemble.

4-1 Screen Replacement for SPM-4388PF

Disassembly and Reassembly

Samsung Electronics 4-5

Fig. 4-9 Lift and remove the mask front.

Fig. 4-10 Remove the bracket and replace the screen.

Disassembly and Reassembly

4-6 Samsung Electronics

4-3 CRT Assembly Replacement (SPM4388PF and SMP5288PF)

1. Remove the mask-front (same procedure as screen replacement).

2. Remove the CRT PCB. Separate the connector from the CRT assembly.

3. Remove 4 screws holding the CRT assembly. Lift up and remove.

4. Position the CRT assembly. Align it into the hole on the main bracket CRT.

Fig. 4-11 Replacement of CRT Assembly

5. Alignment and Adjustments

5-1 RF AGC Adjustment

1. Tune to the strongest local station.

2. Turn the AGC control fully clockwise (VR111, on the IF board).

3. Adjust the AGC control until noise (snow) disappears from the screen.

5-2 Screen Adjustment

1. Turn to the Active channel.

2. Adjust the VR (VR501, VR531, VR561) screen for a normal picture is (no blooming or flyback line).

3. Adjust the FOCUS control for well defined scanning lines in the center area of the screen.

5-3 Horizontal Dynamic Focus

Adjustment

5-4 FBT B+Voltage Adjustment

PREPARATION

1. Note: The B+voltage adjustment (FBT) is done during the chassis check at the factory. Perform this adjustment after Sub-Brightness and Convergence.

2. Warm up the TV for at least for 10 minutes.

3. Input 100% white pattern.

4. Select the “STANDARD“ video mode.

ADJUSTMENT

1. Connect the leads of a multimeter to GT405 (B+) and GT406(G).

2. Set VR401 (on deflection board) to either

126.9V (for NTSC), or 125.6V (for PAL).

PREPARATION

1. Input a crosshatch pattern.

2. Cover the Red and Blue Lenses.

3. Enter “STANDARD“ video mode.

4. Adjust the Green Lens for best focus.

ADJUSTMENT

Adjust VRZ01 (located on the convergence board). Balance the left and right sides of the dynamic focus lines.

Fig. 5-1 Balance the left and right sides

5-1Samsung Electronics

Alignment and Adjustments

5-5 Lens Focus and Static Focus

Adjustment

5-5-1 Static Focus (Electric Focus)

PREPARATION

1. Select the “STANDARD“ video mode.

2. Input a crosshatch pattern.

3. Cover the lenses that are not being adjusted.

4. Connect a convergence jig and read data.

5. Adjust the lens for best focus.

ADJUSTMENT

Vary the focus pack VR (Red, Blue) on the front cabinet. Adjust the TV for best possible focus around the center of the crosshatch pattern, without losing overall screen balance.

5-5-2 Lens Focus

PREPARATION

1. Do this adjustment after the static focus adjustment .

2. Select the “ STANDARD“ video mode. (Contrast: 64, Brightness: 32)

3. Input a cross hatch pattern.

ADJUSTMENT

1. Loosen the lens screws.

2. Cover the two lenses that are not being adjusted.

3. Adjust the lens, observing the color aberration vertically and horizontally within 3 blocks of the center of the crosshatch pattern.

4. When the lens is turned clockwise, the color aberration will change as follows:

Fig. 5-2 Crosshatch Pattern. Examine these points together

Fig. 5-3 Color Aberration

Lens Color Aberration Change R Orange —- Crimson G Blue —- Red B Purple —- Green

5. Green lens adjustment: Set the lens at the point where Blue just changes to Red. If the color aberration is irregular throughout the picture screen, adjust the lens to show Red within a 3-block grid around the horizontal center-line.

Observe the the color aberration near the intersection points of the horizontal and vertical lines (approximately 1 - 3 mm area). If the aberration is irregular, adjust the lens as shown in the diagram below. (Accurate alignment of Green is important for overall color quality.)

6. Set the Red lens at the point where Orange becomes Crimson.

7. Set the Blue lens at the point where Purple becomes Green.

5-2 Samsung Electronics

5-6 Convergence Adjustment

5-6-1 Convergence Adjustment

Alignment and Adjustments

1. Input a PAL pattern.

2. Warm up the set for 30 minutes before adjustment.

3. Display the test pattern (Crosshatch) by pressing the remote-control keys in this sequence : Conv.°Ê Mute °Ê 1°Ê 8°Ê 2.

4. When the convergence data is severely tilted (or if readjustments are necessary because the convergence module was replaced), select the "Mute" and "Yellow (TTX)" keys in turn so that the basic data of module micom applies to the convergence adjustments.

When making only one convergence adjustment, only one parameter needs to be adjusted. (The basic data does not change.)

5. After selecting R-Mute and B-Mute, display only a green color pattern. Center the pattern by adjusting CY.

6. After selecting G-Mute and B-Mute, adjust the Red CY to center the picture.

7. Center the Blue Pattern as above.

11. Adjust Blue as above.

12. After the adjustments are completed, press "Recall" to save the data.

13. Change from PAL mode to NTSC when making NTSC adjustments.

14. After setting the NTSC line (on Screen Jig), readjust as 7~10.

15. After the NTSC pattern adjustments are completed, press the " RECALL" key to save the NTSC data.

16. After the Convergence Adjustments are completed, press the Escape key.

Note

1. If the convergence data is lost during adjustment, use the"Saturation" (TV/Video) key to reset the data to the initial values of the ROM.

2. Make minor adjustments with the User Convergence key. A "+" pattern appears when "Conv." is pressed.

8. After the picture is centered, begin the convergence adjustments.

First, display the green pattern:

The "Menu" key moves the cursor vertically and horizontally.

Use the Channel and Volume keys ( Up/Down) to adjust convergence.

9. Use the "Surround" key for minor adjustments.

10. After the Green Adjustment is completed, press the R-Mute key (confirm Green to Red).

Samsung Electronics

3. Use the "R/B" and "Ch/Vol" keys to correct convergence. After the adjustments are completed, press "Escape".

5-3

Alignment and Adjustments

5-6-2 Screen Jig

Fig. 5-5 43 inch JIG Screen

5-4 Samsung Electronics

Alignment and Adjustments

Samsung Electronics

Fig. 5-5 52 inch JIG Screen

5-5

Alignment and Adjustments

5-6-3 Remote Control for Servicing

5-6 Samsung Electronics

5-7 Manual Alignment (Factory Mode)

1. Enter the Factory Mode. Press the remote-control keys in this sequence:

Alignment and Adjustments

PICTURE OFF

2. Use the CHANNEL and VOLUME keys (Up/Down) to move the cursor. Select an alignment parameter:

SERVICE MODE

ADJUSTMENT TEST PATTERN OPTION BYTES RESET BONUS

3. Adjustment must be done for both 50Hz and 60Hz field rates:

SBT 08 GG 49 SCR 10 BG 32 SCT 13 PW 32 STT 08 GAM 00 RRC 26 ALS 07 GRC 42 ASS 32 BRC 32 PCT 04 RG 28 PTT 32

¢°

Adjustment I

SLEEP

¢°

P.STD

Function SUB-BRIGHT SUB-COLOR SUB-CONTRAST SUB-TINT RED REFERENCE

¢°

MUTE

¢°

Table 5-1

OSD

SBT SCR SCT STT RRC

Range 00~13 00~13 00~13 00~13 00~63

PICTURE ON

Note

Low-light adjustment

Samsung Electronics

GREEN REFERENCE BLUE REFERENCE RED GAIN GREEN GAIN BLUE GAIN PEAK WHITE GAMMA AUDIO LEVEL SETTING AUDIO SEPARATION SETTING PIP CONTRAST PIP TINT

GRC

BRC

RG GG BG

GAM

ALS

ASS

PCT PTT

00~63 00~63 00~63 00~63 00~63 00~63 00~63 00~15 00~63 00~15 00~63

" "

High-light adjustment

" "

5-7

Alignment and Adjustments

4. Access Adjustment II by pressing the CHANNEL keys (Up/Down) while the cursor is positioned on "SBT" or "PTT" (see Adjustment I):

PHS 42 PVA 15 PEW 27 PSC 30 PEP 23 PVS 10 PEC 02 HSP 13 PET 47 PVP 10 PSC 40 PHP 72

Adjustment II - 50Hz Picture

Table 5-2

Function PAL HORIZONTAL SHIFT NTSC HORIZONTAL SHIFT PAL E-W WIDTH NTSC E-W WIDTH PAL E-W PARABOLA NTSC E-W PARABOLA

OSD PHS

NHS PEW NEW

PEP

NEP

Range

00~63 00~63 00~63 00~63

00~63

NHS 32 NVA 32 NEW 27 NSC 13 NEP 30 NVS 55 NEC 02 HSN 11 NET 28 NVP 04 NSL 16 NHP 73

Adjustment II - 60Hz Picture

Table 5-2 (Continued)

Function PAL VERTICAL SHIFT NTSC VERTICAL SHIFT PIP PAL HORIZONTAL SHIFT PIP NTSC HORIZONTAL SHIFT PIP PAL VERTICAL POSITION PIP NTSC VERTICAL POSITION

OSD PVS NVS HSP HSN

PVP

PVN

Range 00~63 00~63 05~20 00~20 00~33

00~33 PAL E-W TRAPEZIUM NTSC E-W TRAPEZIUM PAL VERTICAL SLOPE NTSC VERTICAL SLOPE

PAL VERTICAL AMPLITUDE NTSC VERTICAL AMPLITUDE PAL S CORRECTION NTSC S CORRECTION

PET

NET

PSL NSL PVA

NVA

PSC

NSC

00~63 00~63 00~63 00~63 00~63

00~63

PIP PAL HORIZONTAL POSITION PIP NTSC HORIZONTAL POSITION

PHP

PHN

00~83

5-8 Samsung Electronics

Alignment and Adjustments

5. After the Factory Mode Adjustments are completed, return to the first menu and set up "Test Pattern," "Option" and "Bonus." Use the CHANNEL and VOLUME keys to position the cursor and make a selection:

7-Color Bar Cross hatch Red Green Blue

Test Pattern I

OE 80 BON 01 WD 08 01 40 02 32 03 10 AMS 00 SVR 00

Bonus (see data, below)

Kara-OK On TTX On Tuner CCIR List OSD Language Select

Option Bytes

Table 5-3

Content TDA4780 BLACK STRETCH TDA9170 BLACK OFFSET COMPENSATION ENABLE TDA9170 WINDOW SELECT USER VARIABLE GAMMA (TDA9170) ADAPTIVE GAMMA (TDA9170) NON LINEARITY AMPLITUDE (TDA9170) AMPLITUDE SELECTION (TDA9170) FULL SCREEN BLACK LEVEL (TDA9170)

OSD

BON

01 02 03

AMS

SVR

Samsung Electronics

5-9

5-10 Samsung Electronics

Troubleshooting

Samsung Electronics 6-1

6. Troubleshooting

6-1 No Power

Normal

Check CN801 Pin 2

(STB B ).

Check C801

Check F851.

Check the voltage

on CN801 Pin 1

Check the base voltage

on Q852

Check/Replace

Q851 and Q852.

Check/Replace

Q854.

Check/Replace D808 & R801

Normal

Normal 0V

Normal 12V

Abnormal 0V

Abnormal

Abnormal 0.6V

Check/Replace Q401 and Q402

Replace F854

Check IC901

(VCC)

Normal

Check IC901

Peripheral Circuits

Replace IC901

Abnormal

Check/Replace HC801

Troubleshooting

6-2 Samsung Electronics

6-2 No Picture

Abnormal

Normal

Check Pin 8 of IC501, IC502, IC503

Check TDA4780

(IC203) Pin 1, Pin 13

Low-High

Check TDA9160 (IC202)

Y-output (Pin 1)

Check/Replace m-com (IC901

Replace

TDA9160 (IC202)

Normal

Check TDA4780

Y-input (Pin 8)

Abnormal

Check/Replace

IC203

Abnormal

Normal

Troubleshooting

Samsung Electronics 6-3

6-3 No Sound

Abnormal

Check the Pin 5

of the CN601(mute)

Check pins 9 and 11

of HC651

Abnormal (0V)

Check D859,D860,

F852, F853 on the SMPS

Check/Replace RL651

and m-com (IC901

Abnormal

Check pins 3 and 5 of

the Audio module

Normal ( 28V)

Normal

Check pins 24 and 22

of the Audio mdl

Abnormal Normal

Check pins 16 and 18

of the audio mdl

Check/Replace

upc1853 (IC602)

Check/Replace KA2192,

TC4053BP on the A/V switch

Abnormal

Check/Replace

TDA9840

Check/Replace

IC601

Normal

Troubleshooting

6-4 Samsung Electronics

6-4 Horizontal Line

Abnormal

Normal

Check IC202 and its peripherial circuits

Check IC301 and its peripheral circuits

Check the Waveform of

IC202 Pin 15,16

6-5 Convergence Misaligned

Abnormal

Normal

Check

the waveform of each

terminal in Convergence Module

CN203

After checking the 26V load line, check/replace the Fuse F854, F855 on the SMPS board

Check the Differential Amplifier of each Convergence terminal

Abnormal

Normal

Check the Waveform of

each terminal in Convergence

Module CN202

Replace the Convergence Module.

Check the Circuits Connected to each terminal of Convergence Module CN202

Check the voltage on

CN803 pins 4,6

Normal

Abnormal

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