Read Sony KLV-21SG2 Service Manual online
SERVICE MANUAL
SPECIFICATIONS
KLV-21SG2
LCD Colour TV
AEP Model
Display Unit:
Power Requirement:
220–240 V AC, 50 Hz
Screen Size: 21 inches
Approx. 53.7 cm measured diagonally
Display Resolution:
1,024 dots (horizontal) 768 lines (vertical)
Power Consumption:
94 W
Standby Power Consumption:
1 W or less
Dimensions (w h d):
Approx. 63.0 46.1 24.2 cm
(with stand)
Approx. 63.0 40.0 12.6 cm (without stand)
(with stand)
Approx. 63.0 40.0 12.6 cm (without stand)
Weight:
Approx. 11.3 kg (with stand and rear cover)
Approx. 8.6 kg (without stand and rear cover)
Approx. 8.6 kg (without stand and rear cover)
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× ×
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×
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Panel System:
LCD (Liquid Crystal Display) Panel
TV System:
Depending on your country/region selection:
B/G/H, D/K, L, I
B/G/H, D/K, L, I
Colour System:
PAL, SECAM
NTSC 3.58, 4.43 (only Video In)
NTSC 3.58, 4.43 (only Video In)
Aerial:
75 ohm external terminal for VHF/UHF
Channel Coverage:
VHF: E2–E12
UHF: E21–E69
CATV: S1–S20
HYPER: S21–S41
D/K: R1–R12, R21–R69
L: F2–F10, B–Q, F21–F69
I: UHF
UHF: E21–E69
CATV: S1–S20
HYPER: S21–S41
D/K: R1–R12, R21–R69
L: F2–F10, B–Q, F21–F69
I: UHF
B21–B69
KLV-21SG2 (AEP) 2
Terminals:
1/
1
21-pin Scart connector (CENELEC standard) including
audio/video input, RGB input, and TV audio/video output.
audio/video input, RGB input, and TV audio/video output.
2/
2 (SMARTLINK)
21-pin Scart connector (CENELEC standard) including
audio/video input, S video input, selectable audio/video
output, and SmartLink interface.
audio/video input, S video input, selectable audio/video
output, and SmartLink interface.
3
Y: 1 Vp-p, 75 ohms, 0.3V negative sync
P
P
B
: 0.7 Vp-p, 75 ohms
P
R
: 0.7 Vp-p, 75 ohms
3
audio input (phono jacks)
500 m Vrms (100% modulation),
Impedance: 47 kilo ohms
500 m Vrms (100% modulation),
Impedance: 47 kilo ohms
4
S video input (4-pin mini DIN)
4
Video input (phono jack)
4
Audio input (phono jacks)
Audio output (Left/Right) (phono jacks)
i
Headphones jack
“Memory Stick” slot
Sound Output:
Full range speaker:
4.0 W + 4.0 W
Accessories Supplied:
• Remote control
RM-Y1103 (1)
• Size AA batteries (R6 type) (2)
• Coaxial cable (1)
• Mains lead (Type C-6) (1)
• Mains lead (Type BF) (1)
• Rear cover (1)
• Coaxial cable (1)
• Mains lead (Type C-6) (1)
• Mains lead (Type BF) (1)
• Rear cover (1)
Optional Accessory:
• Wall-Mount Bracket SU-W210
Other Features:
• Teletext, Fastext, TOPtext
• Sleep Timer
• SmartLink (Direct link between your TV and a compatible
• Sleep Timer
• SmartLink (Direct link between your TV and a compatible
VCR or DVD recorder. For more information on SmartLink,
please refer to the instruction manual of your VCR or DVD
recorder.)
please refer to the instruction manual of your VCR or DVD
recorder.)
• TV system autodetection
• Screen Memo
• NexTView (depending on availability of service)
• Screen Memo
• NexTView (depending on availability of service)
S
S
KLV-21SG2 (AEP) 3
LEAKAGE TEST
The AC leakage from any exposed metal part to earth ground
and from all exposed metal parts to any exposed metal part
having a return to chassis, must not exceed 0.5 mA (500
microamperes).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or
The AC leakage from any exposed metal part to earth ground
and from all exposed metal parts to any exposed metal part
having a return to chassis, must not exceed 0.5 mA (500
microamperes).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or
RCA WT-540A. Follow the manufacturers’ instructions to
use these instruments.
use these instruments.
2. A battery-operated AC milliammeter. The Data Precision
245 digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The “limit” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are
examples of a passive VOMs that are suitable. Nearly all
battery operated digital multimeters that have a 2 V AC
range are suitable. (See Fig. A)
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are
examples of a passive VOMs that are suitable. Nearly all
battery operated digital multimeters that have a 2 V AC
range are suitable. (See Fig. A)
After correcting the original service problem, perform the fol-
lowing safety checks before releasing the set to the customer:
1. Check the area of your repair for unsoldered or poorly-sol-
lowing safety checks before releasing the set to the customer:
1. Check the area of your repair for unsoldered or poorly-sol-
dered connections. Check the entire board surface for solder
splashes and bridges.
splashes and bridges.
2. Check the interboard wiring to ensure that no wires are
“pinched” or contact high-wattage resistors.
3. Check that all control knobs, shields, covers, ground straps,
and mounting hardware have been replaced. Be absolutely
certain that you have replaced all the insulators.
certain that you have replaced all the insulators.
4. Look for unauthorized replacement parts, particularly tran-
sistors, that were installed during a previous repair. Point
them out to the customer and recommend their replacement.
them out to the customer and recommend their replacement.
5. Look for parts which, though functioning, show obvious
signs of deterioration. Point them out to the customer and
recommend their replacement.
recommend their replacement.
6. Check the line cords for cracks and abrasion. Recommend
the replacement of any such line cord to the customer.
7. Check the B+ and HV to see if they are specified values.
Make sure your instruments are accurate; be suspicious of
your HV meter if sets always have low HV.
your HV meter if sets always have low HV.
8. Check the antenna terminals, metal trim, “metallized”
knobs, screws, and all other exposed metal parts for AC
Leakage. Check leakage as described right.
Leakage. Check leakage as described right.
SAFETY CHECK-OUT
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k
Ω
0.15
µF
AC
Voltmeter
(0.75 V)
Voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Parts on Set
Earth Ground
WARNING!!
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY SHADING AND MARK
! ON THE SCHEMATIC DIAGRAMS, EXPLODED
VIEWS AND IN THE PARTS LIST ARE CRITICAL FOR
SAFE OPERATION. REPLACE THESE COMPONENTS
WITH SONY PARTS WHOSE PART NUMBERS AP-
PEAR AS SHOWN IN THIS MANUAL OR IN SUPPLE-
MENTS PUBLISHED BY SONY. CIRCUIT ADJUST-
MENTS THAT ARE CRITICAL FOR SAFE OPERATION
ARE IDENTIFIED IN THIS MANUAL. FOLLOW THESE
PROCEDURES WHENEVER CRITICAL COMPONENTS
ARE REPLACED OR IMPROPER OPERATION IS SUS-
PECTED.
! ON THE SCHEMATIC DIAGRAMS, EXPLODED
VIEWS AND IN THE PARTS LIST ARE CRITICAL FOR
SAFE OPERATION. REPLACE THESE COMPONENTS
WITH SONY PARTS WHOSE PART NUMBERS AP-
PEAR AS SHOWN IN THIS MANUAL OR IN SUPPLE-
MENTS PUBLISHED BY SONY. CIRCUIT ADJUST-
MENTS THAT ARE CRITICAL FOR SAFE OPERATION
ARE IDENTIFIED IN THIS MANUAL. FOLLOW THESE
PROCEDURES WHENEVER CRITICAL COMPONENTS
ARE REPLACED OR IMPROPER OPERATION IS SUS-
PECTED.
AVERTISSEMENT!!
ATTENTION AUX COMPOSANTS RELATIFS À LA
SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE TRAME ET
UNE MARQUE ! SONT CRITIQUES POUR LA
SÉCURITÉ. NE LES REMPLACER QUE PAR UNE
PIÈCE PORTANT LE NUMÉRO SPECIFIÉ. LES
RÉGLAGES DE CIRCUIT DONT L’IMPORTANCE EST
CRITIQUE POUR LA SÉCURITÉ DU
FONCTIONNEMENT SONT IDENTIFIÉS DANS LE
PRÉSENT MANUEL. SUIVRE CES PROCÉDURES
LORS DE CHAQUE REMPLACEMENT DE
COMPOSANTS CRITIQUES, OU LORSQU’UN
MAUVAIS FONCTIONNEMENT EST SUSPECTÉ.
SÉCURITÉ!!
LES COMPOSANTS IDENTIFIÉS PAR UNE TRAME ET
UNE MARQUE ! SONT CRITIQUES POUR LA
SÉCURITÉ. NE LES REMPLACER QUE PAR UNE
PIÈCE PORTANT LE NUMÉRO SPECIFIÉ. LES
RÉGLAGES DE CIRCUIT DONT L’IMPORTANCE EST
CRITIQUE POUR LA SÉCURITÉ DU
FONCTIONNEMENT SONT IDENTIFIÉS DANS LE
PRÉSENT MANUEL. SUIVRE CES PROCÉDURES
LORS DE CHAQUE REMPLACEMENT DE
COMPOSANTS CRITIQUES, OU LORSQU’UN
MAUVAIS FONCTIONNEMENT EST SUSPECTÉ.
KLV-21SG2 (AEP) 4
TABLE OF CONTENTS
1. DISASSEMBLY ...................................... 1-1
1-1. REAR COVER AND STAND ASSY REMOVAL
1-1
1-2. REAR CABINET REMOVAL .............................. 1-1
1-3. MS AND U1 BOARDS REMOVAL ..................... 1-2
1-4. G BOARD REMOVAL ......................................... 1-2
1-5. B AND MSB BOARDS REMOVAL ..................... 1-3
1-6. A, TU AND U2 BOARDS REMOVAL ................. 1-3
1-7. H1 AND MSX BOARDS REMOVAL ................... 1-4
1-8. H2 BOARD REMOVAL ....................................... 1-4
1-9. D2 BOARD REMOVAL ....................................... 1-5
1-10. H3 BOARD REMOVAL ..................................... 1-5
2. ADJUSTMENTS .................................... 2-1
2-1. Adjustment of signal level ................................... 2-1
2-1-1. Check AD calibration registration items ...... 2-1
2-1-2. Y signal AD calibration of TV/VIDEO input . 2-1
2-1-3. C signal AD calibration of TV/VIDEO input . 2-1
2-1-4. Y signal AD calibration of COMPONENT input . 2-2
2-1-5. C signal AD calibration of COMPONENT input . 2-2
2-2. White Balance Adjustment
2-2-1. White Balance of color temperature “warm”
2-3
2-2-2. White Balance Adjustment of color
temperature “normal” .................................. 2-3
2-2-3. White Balance Adjustment of color
temperature “cool” ....................................... 2-3
3. DIAGRAMS ............................................ 3-1
3-1. BLOCK DIAGRAMS ........................................... 3-1
3-2. FRAME DIAGRAM ............................................. 3-8
3-3. CIRCUIT BOARDS LOCATION ......................... 3-9
3-4. SCHEMATIC DIAGRAMS AND PRINTED
WIRING BOARDS ............................................. 3-9
(1) Schematic Diagrams of A Board ................... 3-10
(2) Schematic Diagrams of B Board ................... 3-17
(3) Schematic Diagram of H1 and H2 Boards .... 3-25
(4) Schematic Diagram of H3 and U1 Boards .... 3-26
(5) Schematic Diagram of U2 Board .................. 3-27
(6) Schematic Diagram of D2 Board .................. 3-28
(7) Schematic Diagrams of MS Board ................ 3-30
(8) Schematic Diagram of MSB and MSX Boards . 3-34
(9) Schematic Diagram of TU Board .................. 3-35
(10) Schematic Diagram of G Board .................. 3-36
3-5. SEMICONDUCTORS ......................................... 3-38
4. EXPLODED VIEWS ............................... 4-1
4-1. CABINET ASSY AND STAND ASSY ................. 4-2
4-2. CHASSIS ............................................................ 4-3
4-3. PACKING MATERIALS ...................................... 4-4
5. ELECTRICAL PARTS LIST ................... 5-1
