LG Electronics 28LN45 2. No Picture, 3. No Video

Only for training and service purposes

2. No Picture

Module

Back Light On ?

Check WLED_ENABLE high

R131

Check IC101

Replace Main Scaler IC

N N

Check Panel clock

P601(#9,10)

Check IC101

Repair Main B/D

Check Panel power

P601(#27,28,29,30) 12V

IC802 Output 12V

Replace IC802

Replace T-con

Board or module

Check FFC Cable for damage

or open conductors. Replace Cable

Check LED Driver output

(P1101 #1,2,3,4,5)

Check LED Driver IC1101

Replace LED Driver IC

3. No Video - Digital TV

Check RF Cable

Check Tuner(TU2602)

Data, CLK, SYN, VAL

Replace Tuner(TU2602)

Recheck

1. Check Tuner(TU2602 #5) Power (3.3V)

2. Check IC803 Output voltage(3.3V)

Replace IC803

Check Tuner(TU2602) I2C Signal

SCL(R2609), SDA(R2610)

Check IC101

1. Check Tuner(TU2602 #7) Power (1.8V)

2. Check IC805 Output voltage(1.8V)

Replace IC805

Contents

Main Page SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE General Guidance Before returning the receiver to the customer, Leakage Current Cold Check(Antenna Cold Check) SERVICING PRECAUTIONS Page SPECIFICATION 1. Application range 2. Requirement for Test 3. Test method 4. Model General Specification Page 5. Timing 5.1. RGB/HDMI (PC) 5.2. HDMI (DTV) 5.3. Component ADJUSTMENT INSTRUCTION 1. Application Range 2. Designation 3. Main PCB check process * Boot le Download 3.1. EDID Process 3.1.1. EDID download 3.1.2. RGB EDID Data 3.1.3. HDMI EDID Data 3.2. Function Check 4. Total Assembly line process 4.1. Tool option & ADC Check 4.2. Model name & Serial number download 4.2.1. Model name & Serial number D/L 4.2.2. Method & notice 4.3. Function Check 4.3.1. Check display and sound 4.3.2. PCMCIA CARD Check 4.3.3. PIP Check 4.3.4 HDMI MHL Function Inspection(HDMI2 Port only) 4.5. DPM Operation check 4.6. Model name & SW version & Adjust check 4.6.1. Model Name& SW Version Check 4.6.2. Adjust Check 4.7. Outgoing condition Configuration TROUBLE SHOOTING 1. No Power 2. No Picture 3. No Video - Digital TV 4. No Video - Component 5. No Video - RGB 6. No Video - HDMI 7. No Audio BLOCK DIAGRAM LGE2121-MS10 Option(Only for DVB) - ATSC: TDSS-H501F (Half NIM) Option EXPLODED VIEW FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS AR101 1 13 I2C Internal demod out MEMORY OPTION AB3 MODEL OPTION MODEL_OPT_3 T24 MODEL_OPT_8 LOW FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ETHERNET RS232C(SIDE) 4 13 INTERFACE HDMI HDMI_1 MHL OCP HDMI_2 With MHL CEC IR/LED and Control PIN22 VESA IR_OUT(Ready) JEDIA Headphone block FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS R842 R1 M1 Core H/W Option:FULL_NIM LED DRIVER FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS K4B1G1646G-BCK0 2G 1600 K4B2G1646E-BCK0 DDR 12 13 IC1202 S7LR-M_NON_MS10 CI Region CI HOST I/F CI SLOT 120915 Array->normal resistor * Option name of this page : CI_SLOT NETCAST4.0 EU&CHUNA_TUNER_BLOCK Close to TUNER ERROR & VALID PIN 2013.1.14 LNB 27 13 DVB-S2 LNB Part Allegro EAX65303801 FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS 28 13 SCART&COMP SCART / COMPONENT&CVBS [SCART AUDIO MUTE] FULL SCART 121118 SCART AMP IC change SCART AMP SCART / COMPONENT&CVBS COMPONENT&CVBS