Sylvania LC370SL8 Schematic

SUPPLEMENT

SERVICE MANUAL

This service manual shows only the differences between the model LC370SL8 and the original model LC370SS8. All other information is described in the service manual of the model LC370SS8.

37″ COLOR LCD TELEVISION

LC370SL8

TABLE OF CONTENTS

Block Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Schematic Diagrams / CBA’s and Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

Different parts from the original model (LC370SS8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

BLOCK DIAGRAMS

Power Supply Block Diagram

AMP+13V

P-ON+9V

+9V REG

Q637

Q801

Q644

TO SYSTEM

CONTROL

BLOCK

DIAGRAM

P-ON-H

AL+3.3V

CN301

+5V/+12V-LCD 2,3

AL+3.3V 4

P-ON+5V 6,7

TO DIGITAL

MAIN CBA UNIT

(CN3010)

14-16

10-12

+4V

+2.5V

P-ON+9V 8

TO DIGITAL

MAIN CBA UNIT

(CN3025)

CN1

+2.5V 4,5

D+1.0V-VDDC 1,2

+15V 18

+35V 20

+2.5V-UNDER 3

DIGITAL SUB CBA

Q1,Q2,Q3

For continued protection against risk of fire,

replace only with same type 4 A, 125V fuse.

NOTE:

The voltage for parts in hot circuit is measured using

CAUTION ! :

ATTENTION : Utiliser un fusible de rechange de même type de 4A, 125V.

hot GND as a common terminal.

SW +13V

Q639,Q640

4A/125V

T601

CN601

HOT-GND 3

ACL 1

CN501

Q635

SW +5V

Q636

REG

SHUNT

Q631

Q633

COLD

REG

+3.3V

IC637

JS632

Q632

JS612

Q643

IC603

3 2

Q638

Q641

Q650

HOT

SWITCHING

Q601

BRIDGE

RECTIFIER

D502 - D505

L502

LINE

CAUTION !

Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit.

If Main Fuse (F501) is blown , check to see that all components in the power supply

circuit are not defective before you connect the AC plug to the AC power supply.

Otherwise it may cause some components in the power supply circuit to fail.

L503

F501

4A/125V

HOT CIRCUIT. BE CAREFUL.

AC501

AC CORD

HOT

FILTER

ACL

HOT-GND

TO INVERTER

4A 125V

INVERTER CBA

BLOCK DIAGRAM

1-1

CONTROL

Q602

SWITCHING

POWER SUPPLY CBA

A71G1BLP

SCHEMATIC DIAGRAMS / CBA’S AND TEST POINTS

Standard Notes

WARNING

Many electrical and mechanical parts in this chassis have special characteristics. These characteristics often pass unnoticed and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts that have these special safety characteristics are identified in this manual and its supplements; electrical components having such features are identified by the mark “#” in the schematic diagram and the parts list. Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts that do not have the same safety characteristics as specified in the parts list may create shock, fire, or other hazards.

Notes:

1. Do not use the part number shown on these drawings for ordering. The correct part number is shown in the parts list, and may be slightly different or amended since these drawings were prepared.

2. All resistance values are indicated in ohms (K = 10

3. Resistor wattages are 1/4W or 1/6W unless otherwise specified.

4. All capacitance values are indicated in µF (P = 10

5. All voltages are DC voltages unless otherwise specified.

, M = 106).

-6

µF).

2-1 LC4N_SC

+ 7 hidden pages