Skyworth 168P-L2L022- W0 User manual

SKYWORTH R&D CENTER
Power Supply Service Manual
PART NO. : 168P-L2L022- W0
DESCRIPTION ：
VERSION NO. ： 1.0
PAGE ： 11
DESCRIBED ： Wang Min
CHECKED ： Yang Jitao
APPROVED ： Bao Xiaojie
Released Date: 2014-09-21

168P-L2L022-W0 Service manual
I
Modification record
Edition Modification
date Record Described Checked Approved
1.0 2014-9-21 First record Wang Min Yang Jitao Bao Xiaojie

168P-L2L022-W0 Service manual
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Contents
NO. Main contents Page
1 General Description 1
2 General Introduction of Circuit 2
3 The main chip description 3
4 PCB TopOverlay or BottomOverlay 7
5 Maintenance instructions 8
6 The information of power supply designer 10
7 Schematic diagram 11

168P-L2L022-W0 Service manual
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Warning
This manual is only used for the experienced service person , and does not apply to the general
consumer。The manual does not have warnning or alert for the potential hazards caused of the
non-technical personnel attempting to repair this product . Electrical products should be an
experienced professional and technical personnel for maintenance and repair ,any other person
attempts to maintain and repair the products covered by this manual will likely be seriously hurt or
even life-threatening.
1.General Description
1.1 General description of power supply
This power supply is suitable for 24" LED TV. For 24" LED panel, supplies 2 channels, each
channel nominal current value is 90mA; for 24” movement, only supplies +12V power, rated current
value +12V/2.0A..
1.2 Main technical specifications
1.2.1 Input Electrical Characteristics
1.2.2 Output Electrical Characteristics
Output
Voltage
Regulation Min. current Rated current Peak current
+12V ±5% 0.1A 1A 2A
Note:* pulse width within 100ms .
Input Voltage Range 90Vac to 264Vac
Normal Voltage Range 100Vac to 240Vac
Max Input AC Current 1.5Amax at 90VAC input & full load condition
Efficiency(full load) 80%min @ 115Vac,Full Load
Frequency Range 50Hz/60Hz±5%
Inrush Current (cold start) 30Atyp peak, 120Vac; 50Atyp peak, 220Vac
Harmonic Current Meet GB17625.1-1998/IEC61000-3-2 class D
Power Factor(full load) NO PFC
Leakage Current Less Than 0.75mA, 230Vac input
Input Fuse T3.15A L/250Vac
Standby Power Loss ≦0.5W, 240Vac input,+12V/16mA Load

168P-L2L022-W0 Service manual
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1.2.3 Output ripple and noise
Output Voltage Ripple & Noise (Max.)
+12V 120mVp-p@25℃; 200mVp-p@-10℃
Note: 1) Measurements shall be made with an oscilloscope with 20MHz bandwidth.
2) Outputs shall be bypassed at the connector with a 0.1uF ceramic capacitor and a 10uF
electrolytic capacitor to simulate system loading.
2.Circuit description
2.1 The power circuit diagram
2.2 Each part of the circuit description
2.2.1 the main part of the circuit：TEA1733T
Features

168P-L2L022-W0 Service manual
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3. The main chip description
3.1 The main chip
3.1.1 The main chip general description
The main chip of power supply is the TEA1733T which is produced by NXP corporation.The
operating mode is CCM (continuous conduction mode), and the operating frequency is 65KHz.
3.1.2 The chip pin information
3.1.3 The chip block diagram

168P-L2L022-W0 Service manual
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3.1.4 The IC pin description
3.2 The LED driver chip
3.2.1 General description
The chip using MP3398A, is a highly integrated and high performance LED driver that
optimized for LCD backlight application.
3.2.2 The chip block diagram

168P-L2L022-W0 Service manual
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3.2.3 The chip pin information
3.2.4 The pin description

168P-L2L022-W0 Service manual
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168P-L2L022-W0 Service manual
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4. PCB TopOverlay and BottomOverlay
4.1 The power supply TopOverlay
4.2 The power supply BottomOverlay

168P-L2L022-W0 Service manual
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5. Maintenance instructions
5.1 Common Fault Analysis and Notes
1.No +12V output voltage
If there is no +12V output voltage , we should focus on checking the main chip (U1) and judge whether the
IC is operating . Monitor its VIN pin and check voltage is normal or abnormal . If it is normal , firstly , check the
main chip peripheral circuit . Secondly, check main chip and judge it has broken or not.
2. +12V output is abnormal
Check the +12V feedback loop , and the reference voltage of the U3 is normal or not.
5.2 Service process

168P-L2L022-W0 Service manual
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5.3 Port and the connection defined
5.3.1 PIN10 CN2 Connection And Function
NO. Pin Connection Function
1 ENA BL_ON/OFF
2 PWM PWM
3 GND GND
4 NC NC
5 GND GND
6 NC NC
7 GND GND
8 GND GND
9 +12V +12V DC OUTPUT
10 +12V +12V DC OUTPUT
Note: CN2 TYPE : 2.5mm
5.3.2 PIN10 CN3 Connection And Function
NO. Pin Connection Function
1 LED+ LED+ OUTPUT
2 NC NC
3 LED1- LED- INPUT
4 LED2- LED- INPUT
5 NC NC
6 NC NC
7 LED3- LED- INPUT
8 LED4- LED- INPUT
9 NC NC
10 LED+ LED+ OUTPUT
Note: CN3 TYPE : 2.0mm

168P-L2L022-W0 Service manual
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5.4 Key components and service parts list
NO. Material number
Material
models
Position
number
Function
Substitute
Material
Remark
1 4706-T17330-0080 TEA1733T U1 Main chip
2 476A-M33980-0160 MP3398AGS U4 LED driver chip
3 4628-K0765F-0000 JCS7N65FB Q1 Main MOS
4 451S-210100-0S20 LV10T100D D11
D12
Secondary
Schottky
5 5132-06003A-0000 SANHE-26-047 T1 transformer
5.5 Storage, transportation and using conditions
5.5.1 Package
Box must have the product name, model, identification，quality inspection department certification，the date of
manufacture and so on.
5.5.2 Transportation
The productor adapted to cars, boats, aircraft transport .Transportation should be covered, prevented sunshine
and loading lightly.
5.5.3 Storage
Products should be stored in a box if it is not used .The storehouse environment temperature is from
-40 ℃ to -55 ℃, relatived humidity is from 10% to -95%. The storehouse must not allow any harmful gases,
flammable ,explosive and corrosive product chemicals, and must not allow strong mechanical vibration, shock
and strong magnetic field. Boxes should be at least 20cm high from the ground .The distance from the wall, heat
source, windows or air enter is at least 50cm. The storage period is about two years, more than two years should
be re-tested under the regulation .
6.Information of Power supply designers
Team Ⅱ Power Supply,R&D Center
Yang Jitao and Wang Min
Email： [e-mail]
[e-mail]

5
5
4
4
3
3
2
2
1
1
4 4
3 3
2 2
1 1
Freq(KHz)=67320/Rosc(kΩ)
Iled(mA)=810*1.22(V)/Riset(kΩ)
Vovp(V)=1.23(1+Rhigh/Rlow)
Rlow=10(kΩ)
SPECIFICATION
OUTPUT: +12V:0.1-2.0A
INPUT: 100-240V AC(50/60Hz)
N L
BL_EN
BL_ADJ
+12V
+12V
+12VA
+12V
BL_EN
BL_ADJ
LED+
+12VA
+12V
+12V
LED+
+12VA
+12V
Title
Size Document Number Rev
Date: Sheet of
<Doc> <RevCode>
65inch Thin Power
C
1 1Saturday, June 28, 2014
Title
Size Document Number Rev
Date: Sheet of
<Doc> <RevCode>
65inch Thin Power
C
1 1Saturday, June 28, 2014
Title
Size Document Number Rev
Date: Sheet of
<Doc> <RevCode>
65inch Thin Power
C
1 1Saturday, June 28, 2014
R31
22R/1206
D12
10A 100V
1
3
2
C5
471
R32
2M/1206
CY5
1000pF
R27
22Ω
DW2
1
1
+
C32
47UF/50V
R77
22Ω
R8
1MΩ/1/4W
R74
0Ω
R65
10KΩ
!
R14
10R 1/8W
C3
104
CY1
100pF
R64
100KΩ
CN3
10PIN(2.0MM)
1
2
3
4
5
6
7
8
9
10
CY4
470pF
C16
104
R54
0R27/1206
R72
0Ω
R20
2M/1206
!
!
HS1
1
1
2
2
3
3
4
4
C10
224
L4
90uH 2A
1 2
R23
2M/1206
R42
10KΩ
CY2
100pF
L1
BEAD
1 2
C6
474
ZD7
15V
C19
104
CY3
470pF
C26
103
R55
0R27/1206
R71
0Ω
ZD1
18V
MK4
1
1
U4
MP3398AGS-LF-Z
COMP
1
EN
2
PWM
3
GND
4
OSC
5
ISET
6
ADIM
7
LED4
8LED3 9
LED2 10
LED1 11
OVP 12
ISENSE 13
GATE 14
VIN 15
VCC 16
R78
10KΩ
C29
102
+
C22
470UF/25V
R22
2M/1206
C30
101
R79
240K
Q TH1
5Ω
R10
1MΩ/1/4W
!
R41
10KΩ
Q1
10A 700V
1
23
U2
PC817C
1
23
4
R43
39KΩ
U1
TEA1733T/N1
VCC 1
GND 2
DRIVER 3
ISENSE 4 VINSENSE
5
PROTECT
6
CTRL
7
OPTIMER
8
R73
0Ω
R21
2M/1206
R5
100KΩ/1/4W
!
+
C27
47UF/100V
Q3
MMBT4403
1
23
C18
224
R61
100KΩ
F1
FUSE T3.15A L 250VAC
R24
220K/1206
H2
1
1
!
R13
1MΩ/1/4W
H3
1
1
TN1
PQ-0560MX
Q4
MMBT4401
1
2 3
+
C12
470UF/25V
D9
1N4007
R2
10K
R58
270R
Q7
ME15N10-G
1
23
CN1
AC JACK SOCKET
1
N
L2
G3
4
G
5
G
!
D1
IN5397
U3
AS431
1
2
3
+
C1
68UF/450V
R7
1MΩ/1/4W
N1 N2
LF1
18mHx2
4
3 2
1
MK1
1
1
R68
NC
R39
470Ω
R3
0.3Ω/2W
C14
104
!
+
C13
470UF/25V
D8
1N4148W
C20
104
R11
1MΩ/1/4W
R15
10R 1/8W
ZD2
5V1/1W
C7
224
R66
470KΩ
C11
470pF/1KV
R4
4R7/1/4W
H4
1
1
R53
4.7KΩ
!
D2
IN5397
C17
470pF/1KV
R76
0Ω
10PIN(2.5MM)
CN2
1
2
3
4
5
6
7
8
9
10
R63
22Ω
R47
10KΩ
R45
22Ω
C9
102
!
C8
104
R9
1MΩ/1/4W
D5
IN4007
MK2
1
1
R75
NC
R12
1MΩ/1/4W
DW1
1
1
R18
120KΩ
R16
1KΩ
+
C23
470UF/25V
R85
100R/1206
R59
NC
R82
22Ω
!
R56
0R27/1206
R25
10KΩ
R80
470KΩ
R70
0Ω
R60
22Ω
L2
BEAD
12
D10
1N4007
!
R46
10KΩ
D15
5A/150V
ZD10
2.7V/1206
ZD3
27V
MK3
1
1
ZD5
30V
CX1
220nF
R81
220Ω
R62
10KΩ
R67
22KΩ
CX2
220nF
!
R6
1MΩ/1/4W
T1
TRANSFORMER
6
4
2
1
8
10
C25
474
R48
1K
R83
100R/1206
ZD4
3.3V
R26
100KΩ
R29
47R/1206
C33
474
L3
700nH
1 2
R19
4R7/1/4W
!
!
D13
1N4148W
C2
392/630V
D3
IN5397
R40
1K
D7
UF4007
D11
10A 100V
1
3
2
R28
4.7MΩ/1/8W
R30
47R/1206
R84
100R/1206
D4
IN5397
C31
104
!
R17
33KΩ
H1
1
1
+
C4
4U7/50V
R1
100KΩ 2W
+
C15
4U7/50V
C24
NC
!