Skyworth 168P-P24TTU-20 User manual

Skyworth Group R&D Academy
PowerSupplyServiceManual
Product Name: 168P-P24TTU-20
File Name：
Current Version：1.0
No. of Pages：
Design：
Verification：
Authorization：
Date of issue：2010-05-25

168P-P24TTU-20PowerSupplyServiceManual
I
CHANGELOG
Version Date  Note Design Verification Authorization
1.0 2010‐5‐5 NewDesign 黄德强 钟小斌 鲍晓杰
Change

Change
Version

168P-P24TTU-20PowerSupplyServiceManual
II
CONTENTS
No. Name Page
1 ProductSummary1
2 CircuitDescription2
3 MainChipDescription3
4 PCBTop/BottomLayerScreenPrinting8
5 Troubleshooting8
Resources
1、Latestchipdrivers/softwareinventory
\\172.16.111.249\Home\开发中心\技术管理部\技术管理部查询快捷方式\内销软件资料查询一览表
2、Chipproductde s i g n information(includingeachupdateandversioninformation)
A、\\172.16.111.249\Home\开发中心\技术管理部\技术管理部查询快捷方式\内销设计资料查询总目录
B、\\172.16.111.249\Home\开发中心\技术管理部\技术管理部查询快捷方式\外销设计资料查询总目录
3、ChipBOMinventory
PleaselogintoSAP

168P-P24TTU-20PowerSupplyServiceManual
1
WARNING
This particular service manual is only for experienced maintenancestaff.Itisnotapplicabletousual
customers. No other warning has been given within this manual regarding non‐professionals trying to
operate relevant products. For people other than experienced expertandtechnicalpersonnel,making
adjustments or performing procedures to products described in thismanualmayresultinseriousinjury,
somemayevenendupinlife‐threateningsituation.
1 ProductSummary
1.1 PowerSupplyOverview
Thisversionofpowersupplycontainsa42‐inchuniversalpoweradapter:+5V/0.5Aoutput;overall
powerloss≤1W(240VACLoad70mA);fullprotectionabilities;lowcost;inputvoltagerangeswidelyfrom
90Vto264V.
1.2 MainTechnicalStandard
1.2.1 InputFeatures
Input voltage range 输入电压
90Vac to 264Vac
Normal voltage range 标称输入 100Vac to 240Vac
Frequency range 频率范围 50Hz/60Hz±5%
Max input ac current
满载输入电流
0.8Amax at 100VAC input & full load condition
Inrush current (cold start)
浪涌电流
50Atyp peak, 120Vac; 100Atyp peak, 220Vac
Efficiency(full load) 效率 85%min @ 220Vac,Full Load
Harmonic current 谐波电流 Meet GB17625.1-1998/IEC61000-3-2 class D
Leakage Current 泄漏电流 Less Than 0.75mA, 230Vac input
Standby Power Loss 待机功耗 ≦1W, 240Vac input,70mA Load
Input Fuse 输入保险 T3.15A L/250Vac
1.2.2 OutputFeatures
Output Voltage
输出电压
Regulation
调整率
Min. current
最小电流
Rated current
额定电流
Peak current
峰值电流
+12V +12V±7% 0.5A 2.5A 4.5A
+5V +5V±7% 0.5A 2A 2A
+5VSB +5VSB±7% 0.1A 0.1A 0.5A
Note:* pulse width within 100ms 脉宽小于 100 毫秒。

168P-P24TTU-20PowerSupplyServiceManual
2
1.2.3 OutputRippleandNoise
Output Voltage Ripple & Noise (Max.)
+12V 120mVp-p@25℃
+5V 100mVp-p@25℃
Note: 1) Measurements shall be made with an oscilloscope with 20MHz bandwidth.
示波器带宽须设置在 20 兆赫兹。
2) Outputs shall be bypassed at the connector with a 0.1uF ceramic capacitor and a 10uF
electrolytic capacitor to simulate system loading.
电源输出端并联 0.1uF 的陶瓷电容和 10uF 的电解电容来模拟负载测试。
2 CircuitDescriptions
2.1 OverallDiagram
2.2 InformationAboutEachSubCircuit
2.2.1 PWMcircuit：ON  NCP1271P65G
MainFeatures：
a.Frequency Jittering For Softened EMI Signature
b.Internal High-Voltage Startup Current Source for Lossless Startup
c.Intrenal Latch for Easy Implementation of Overvoltage and Overtemperature Protection
d. Adjustable Skip Level
2.2.2 Inverte circuit：O2MICRO OZ9910BSN
MainFeatures：
a.Controller for high-voltage DC/AC converters
b.Soft start function
c.Built-in open-load protection,over-voltage protection,over-current protection,and TUV
protection。
transformer
EMI
Filter
Rectiflier
110-220V
A
C
＋12V/2.5A
+5V/2.5A
OUTPUT

168P-P24TTU-20PowerSupplyServiceManual
3
3 MainChipDescriptions
3.1 PWMChip
3.1.1 ChipBlockDiagram
3.1.2 ChipPinDiagram
3.1.3 ChipPinFunctions

168P-P24TTU-20PowerSupplyServiceManual
4
3.2 DriverChip
3.2.1 ChipBlockDiagram
3.2.2ChipPinDiagram

168P-P24TTU-20PowerSupplyServiceManual
5
3.2.3ChipPinFunctions

168P-P24TTU-20PowerSupplyServiceManual
6
4 PCBTop/BottomLayerScreenPrinting
4.1 TopLayerScreenPrintingDiagram
4.2BottomLayerScreenPrintingDiagram
5Troubleshooting
5.1 CommonMalfunctionsAnalysis

168P-P24TTU-20PowerSupplyServiceManual
7
1、No+5VSBoutput
Ifno+5VSBoutputisdetected,please  examiningwhetherIC7  isstillworkingnormally.IfitsVCCpin’s
voltageisregular,firstensurethattheIC’speripheralcircuitisworkingproperly,thenchecktheIC7.Ifthe
VCCpin’svoltageisnotnormal,examinethepowerlineof  IC7.
2、+5VSBoutputnormal，butno+12V
Firstly, make sure PS_ON is in high electric level.
Secondly, make sure Q62 PIN1 is in low electric level with multimeter. If no, check all electric
circuit of Q63. If still found no problem, change Q62.
3、+5VSB abnormal voltage
Checktheloopof+5VSB, reference voltage of IC5(TL431), photo coupler IC6 sequentitally.

4、TroubleshootingDiagram
TroubleshootingDiagram1
No+5VSB
N Y
Y
N
Y
N
Examinethereason
AreIC5andIC6damaged?
Changethedamagedcomponent
ExaminethevoltageofC66:
127‐340V?
CheckperipheralcircuitsofIC7、Q61
ExamineF61,D61,TH6, 
changethedamagedunit
If5Voutputisshort‐circuited