Haier LET39Z18HF Service Manual
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Haier LET39Z18HF Service Manual

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This service information is designed for experienced repair technicians only and is not designed for use by the general public.
It does not contain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product.
Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair
the product or products dealt with in this service information by anyone else could result in serious injury or death.
SERVICE MANUAL
Model No. LET39Z18HF
WARNING
©2011 Qingdao Haier Electronics Co., Ltd.
All rights reserved. Unauthorized copying and distribution is a violation of law.
Haier Group
LED TV
MT5310
Chassis

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  • Page 1 Products powered by electricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product or products dealt with in this service information by anyone else could result in serious injury or death. ©2011 Qingdao Haier Electronics Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.

  • Page 2: Table Of Contents

    Service Manual Model No.: Chapter 1: General Information 1-1. Table of Contents ..............1. General Information 1-1. Table of Contents 1-2. General Guidelines 1-3. Important Notice 1-4. How to Read this Service Manual ..................2. Specification ......... 3. Location of Controls and Components 3-1.
  • Page 3 Service Manual Model No.: - 02 -...

  • Page 4: General Guidelines

    Service Manual Model No.: 1-2. General Guidelines When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or damaged by the short circuit. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly installed.
  • Page 5 Service Manual Model No.: 1-3-6 Safety Check after Repairment in the original positions, or whether there are the positions which are deteriorated around the serviced places serviced or not. Check the insulation between the antenna terminal or external metal and the AC cord plug blades. And be sure the safety of that. General Servicing Precautions 1.
  • Page 6 Service Manual Model No.: Electrostatically Sensitive (ES) Devices Some semiconductor (solid-state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor "chip"...

  • Page 7: How To Read This Service Manual

    Service Manual Model No.: 1-3-8. Photo used in this manual The illustration and photos used in this Manual may not base on the final design of products, which may differ from your products in some way. 1-4. How to Read this Service Manual Using Icons: each icon is described in the table below: Note:...

  • Page 8: Specification

    Service Manual Model No.: 2. Specification Model LET39Z18H Screen Size 39inch Aspect Ratio 16:9 Resolution 1920x1080 8 (GRAY TO Response Time (ms) GRAY) Angel of View Color Display 16777216 No. of Preset Channels 200 OSD Language Eng... Color System Audio System BG/DK/I Audio Output Power 10W×2...

  • Page 9: Location Of Controls And Components

    Service Manual Model No.: 3. Location of Controls and Components 3-1 Board Location Part Number Description Main board A Board DH1QP0M0102M 0113050494 B Board Power board 3-2 Main Board CN4: Main CN3: CN19: DVD CN11: LVDS CN16: Amplifier CN17: Power Supply Inverter Power &...
  • Page 10 Service Manual Model No.: 3-2-1 Function Description: Main Board Process signal which incept from exterior equipment then translate into signal that panel can display. Main board connector Power connectors (CN3,CN4) - 09 -...
  • Page 11 Service Manual Model No.: Keypad and remote connector (CN10) Pin number Signal name Description Ground Power key CH- key CH+ key Vol- key Vol+ key Meny key TV/AV key Ground IR Receive LED_G Green Indicator LED_R Red Indicator +5V DC Power Supply - 10 -...

  • Page 12: Power Board

    Service Manual Model No.: 3-3. Power Board DC Output Location : CON4 Connector type : XH-13W (2.5mm) or equivalent Pin assignments: Table. Pin No Symbol Description 1 , 2 +12V 3 4 5 12 13 6 7 10 11 +5VSB ON/OFF Location : CON1...
  • Page 13 Service Manual Model No.: 3-4. LED Panel FEATURES CHARACTERISTICS ITEMS SPECIFICATIONS Screen Diagonal [in] 38.5 Pixels [lines] 1920 × 1080 Active Area [mm] 853.92(H) x 480.33(V) Sub-Pixel Pitch [mm] 0.17675(H) x 0.53025(V) Pixel Arrangement RGB vertical stripe Physical Size [mm] 955.04(W) ×...
  • Page 14 Service Manual Model No.: 3-5 Interface Connec t ions CNF1 Connector Pin Assignment: (FI-RE51S-HF(JAE) or equivalent) Symbol Description Symbol Descrip tion Ground CH2[0]- Second pixel Odd LVDS Signal- Second pixel Odd LVDS Signal+ CH2[0]+ Second pixel Odd LVDS Signal- CH2[1]- Second pixel Odd LVDS Signal+ CH2[1]+ CH2[2]-...

  • Page 15: Disassemble And Assemble

    Service Manual Model No.: 4. Disassemble and assemble Front Back - 14 -...
  • Page 16 Service Manual Model No.: 4-1, Remove the 4 screws as below picture 4-2, Remove the 17 screws on the back cabinet - 15 -...
  • Page 17 Service Manual Model No.: 4-3, Remove the 4 screws on the back cabinet. 4-4, Remove the 2 screws as below picture - 16 -...
  • Page 18 Service Manual Model No.: 4-5, Remove the 3 screws on the fixing board 4-6,Remove the 2 screws as below picture - 17 -...
  • Page 19 Service Manual Model No.: 4-7,Remove the 4 screws as below picture 4-8,Remove the PCB board as below picture - 18 -...

  • Page 20: Electrical Parts

    Service Manual Model No.: 5. Electrical parts 5-1. Circuit Diagram - 19 -...
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  • Page 29: Trouble-Shooting

    Service Manual Model No.: 6. Trouble-shotting 1. 1. Power Supply Troubleshooting Power Supply Troubleshooting Check if Check if Check if surrounding surrounding components - 2 8 -...
  • Page 30 Service Manual Model No.: 2. 2. Display Troubleshooting (Exceptional Screen / White Screen) E ceptional Screen Exceptional Screen / White Screen Is upgrade software OK? Wrong Software Check if the LVDS cable is correct and connected tightly Check if the voltage of CN11_PIN1 is OK (Determined by the screen) Check the circuit...
  • Page 31 Service Manual Model No.: 3. 3. Display Troubleshooting (Black Screen) Black Screen Check if backlight is OK? Reference to the maintenance process of "Exceptional screen / Whit White screen" " Check if the voltage of CN3_PIN3 (BLON Signal) is high level Check if the voltage of CN3_PIN4 is normal? 1 Check Q3 and surrounding components 1 Check Q3 and surrounding components.
  • Page 32 Service Manual Model No.: 4. Audio Trouble 4. Audio Troubleshooting All Channels No Sound All Channels No Sound All Channels No Sound Check Volume and MUTE Settings are normal Check if there is signal on CN17 Check if UA1 PIN1 3 10 12 19 20 UA1_PIN1,3,10,12,19,20 are Check if the voltage of UA1 PIN2 i hi h...
  • Page 33 Service Manual Model No.: 5. Audio Trouble 5. Audio Troubleshooting SCART/PC/AV/ SCART/PC/AV/YPbPr YPbPr No Sound No Sound SCART/PC/AV/ SCART/PC/AV/YPbPr SCART/PC/AV/ SCART/PC/AV/YPbPr YPbPr No Sound YPbPr No Sound No Sound No Sound Reference to the maintenance process Check if other of “All Channels No All Channels No channels are no sound? Sound”...
  • Page 34 Service Manual Model No.: 6. Function Trouble 6. Function Troubleshooting ATV/DVB-T/DVB-C can't scan any channel ATV/DVB ATV/DVB- - T/DVB T/DVB- - C C 1.Check if the external RF input signal is normal. 2.Check if the country, region and standard are set correctly. Check if the voltage Check if the voltage of Check if T1_PIN6,7...
  • Page 35 Service Manual Model No.: 7. Function Trouble 7. Function Troubleshooting (HDMI) (HDMI) HDMI No Signal / Only Picture But Sound / Exceptional Screen But Sound / Exceptional Screen Every HDMI channel Every HDMI channel Only one HDMI channel isn’t work. isn’t work.
  • Page 36 Service Manual Model No.: 8.Function Trouble 8.Function Troubleshooting (PC) (PC) PC Channel PC Channel Image Picture is No signal Color fade Dithering not in center Check if the R,G,B input signals Check if the VS,HS input signals of U1_PIN152~156 are normal? of U1_PIN150,151 are normal? OSD setting The data of...
  • Page 37 Service Manual Model No.: 9.Function Trouble 9.Function Troubleshooting (SCART) (SCART) SCART Channel SCART Channel SCART SCART-OUT SCART SCART-OUT Can’t automatically No Signal No Sound color fade No Signal switch to SCART channel Check if the Check the Check if the Check the R,G,B input Check the circuit...
  • Page 38 Service Manual Model No.: 10. Function Trouble 10. Function Troubleshooting (AV, (AV,YPBPR) ) YPbPr No Signal / Color Fade CVBS N Si No Signal Check if the 5V power Check if supply of U16_PIN16 U11_PIN4,7,9 and control signal of Check if the have signals? have signals? Check if C58...

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