FUNAI LH850-M19 Service Manual

FUNAI LH850-M19 Service Manual

19″ color lcd television
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SERVICE MANUAL
This Service Manual is for the
LH850-M19 (A0CN2EP) / LH851-M19 (A0CN3EP) model.
For the LH850-M19 (A0CN2EP) / LH851-M19 (A0CN3EP) model, the letter
(A0CN2EP) / (A0CN3EP) is printed on the Serial Number Label on the back
of the unit. Refer to the Serial Number Label below.
Serial No. Label
19" COLOR LCD TELEVISION
LH850-M19
LH851-M19
"A0CN2EP"
Serial No. Label
"A0CN3EP"

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Summary of Contents for FUNAI LH850-M19

  • Page 1 This Service Manual is for the LH850-M19 (A0CN2EP) / LH851-M19 (A0CN3EP) model. For the LH850-M19 (A0CN2EP) / LH851-M19 (A0CN3EP) model, the letter (A0CN2EP) / (A0CN3EP) is printed on the Serial Number Label on the back of the unit. Refer to the Serial Number Label below.
  • Page 2: Table Of Contents

    19″ COLOR LCD TELEVISION LH850-M19 / LH851-M19 TABLE OF CONTENTS Specifications ................1-1 Important Safety Precautions.
  • Page 3: Specifications

    SPECIFICATIONS < TUNER > VHS/UHF Input ----------- 75Ω unbal., IEC Connector Center IF ------------------- SECAM-L 38.9MHz, SECAM-L’ 33.9MHz Description Condition Unit Nominal Limit 1. Video S/N 2. Audio S/N 40/40 < LCD PANEL > Description Condition Unit Nominal Limit Horizontal pixels 1366 1.
  • Page 4 < AUDIO > All items are measured across 16 Ω load at speaker output terminal. Description Condition Unit Nominal Limit 1. Audio Output Power 10% THD: Lch/Rch 3.0/3.0 2.0/2.0 2. Audio Distortion 500mW: Lch/Rch 1.5/1.5 3.0/3.0 -6dB: Lch 70 to 8 k 3.
  • Page 5: Important Safety Precautions

    IMPORTANT SAFETY PRECAUTIONS Prior to shipment from the factory, our products are strictly inspected for recognized product safety and electrical codes of the countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions when a set is being serviced.
  • Page 6 4. Hot Chassis Warning - 7. Product Safety Notice - Some electrical and mechanical parts have special safety-related a. Some TV receiver chassis are electrically characteristics which are often not evident from connected directly to one conductor of the AC visual inspection, nor can the protection they give power cord and maybe safety-serviced without necessarily be obtained by replacing them with...
  • Page 7 Precautions during Servicing A. Parts identified by the ! symbol are critical for safety. Replace only with part number specified. B. In addition to safety, other parts and assemblies are specified for conformance with regulations applying to spurious radiation. These must also be replaced only with specified replacements.
  • Page 8 Safety Check after Servicing Examine the area surrounding the repaired location Chassis or Secondary Conductor for damage or deterioration. Observe that screws, parts and wires have been returned to original posi- tions. Afterwards, perform the following tests and con- Primary Circuit firm the specified values in order to verify compliance with safety standards.
  • Page 9: Standard Notes For Servicing

    STANDARD NOTES FOR SERVICING Circuit Board Indications How to Remove / Install Flat Pack-IC 1. The output pin of the 3 pin Regulator ICs is 1. Removal indicated as shown. With Hot-Air Flat Pack-IC Desoldering Machine: 1. Prepare the hot-air flat pack-IC desoldering Top View Bottom View machine, then apply hot air to the Flat Pack-IC...
  • Page 10 With Soldering Iron: With Iron Wire: 1. Using desoldering braid, remove the solder from 1. Using desoldering braid, remove the solder from all pins of the flat pack-IC. When you use solder all pins of the flat pack-IC. When you use solder flux which is applied to all pins of the flat pack-IC, flux which is applied to all pins of the flat pack-IC, you can remove it easily.
  • Page 11 2. Installation Instructions for Handling Semi- 1. Using desoldering braid, remove the solder from conductors the foil of each pin of the flat pack-IC on the CBA Electrostatic breakdown of the semi-conductors may so you can install a replacement flat pack-IC more occur due to a potential difference caused by easily.
  • Page 12: Cabinet Disassembly Instructions

    CABINET DISASSEMBLY INSTRUCTIONS 1. Disassembly Flowchart Removal Step/ Remove/*Unhook/ This flowchart indicates the disassembly steps for the Loc. Part Fig. Unlock/Release/ cabinet parts, and the CBA in order to gain access to Note Unplug/Unclamp/ item(s) to be serviced. When reassembling, follow the Desolder steps in reverse order.
  • Page 13 (S-2) (S-4) (S-2) (S-2) (S-4) [2] Rear Cabinet (S-2) (S-2) (S-3) [1] Stand Assembly (S-1) Fig. D1 A0CN2DC...
  • Page 14 [12] Front Cabinet [6] Shield Box (S-10) [5] Jack Holder (S-7) (S-8) (S-10) [10] Speaker (H-1) Speaker Holder (S-9) (S-13) (S-14) [11] Function CBA (S-8) [7] Digital Main [10] Speaker (S-13) CBA Unit (S-5) Speaker Holder [4] Main CBA [3] Tuner Shield (S-6) [9] LCD Module Assembly...
  • Page 15 TV Cable Wiring Diagram To LCD Module Assembly To LCD Module Assembly Main CBA CN3901 CN301 CN302 CN3701 CN1001 CN303 CN3703 CN3702 CN404 CN3401 CN1002 CN401 CN3704 Digital Main CN802 CBA Unit CN801 CORD CN152 To Speaker To Speaker Function CBA CN101B Fig.
  • Page 16: Electrical Adjustment Instructions

    ELECTRICAL ADJUSTMENT INSTRUCTIONS General Note: “CBA” is abbreviation for How to set up the service mode: “Circuit Board Assembly.” Service mode: Note: Electrical adjustments are required after 1. Turn the power on. replacing circuit components and certain mechanical parts. It is important to perform 2.
  • Page 17 1. Purity Check Mode 2. VCOM Adjustment This mode cycles through full-screen displays of red, Test Point Adj. Point green, blue, and white to check for non-active pixels. 1. Enter the Service mode. Screen buttons 2. Each time pressing [7] button on the remote M.
  • Page 18 The White Balance Adjustment should be 5. [CUTOFF] Press [1] button to select “COR” for Red Cutoff performed when replacing the LCD Panel adjustment. Press [3] button to select “COB” for or Digital Main CBA. Blue Cutoff adjustment. [DRIVE] 3. White Balance Adjustment Press [4] button to select “DR”...
  • Page 19: How To Initialize The Lcd Television

    HOW TO INITIALIZE THE LCD TELEVISION How to initialize the LCD television: 1. Turn the power on. 2. Enter the service mode. (Refer to page 5-1.) - To cancel the service mode, press [ ] button on the remote control unit. 3.
  • Page 20: Firmware Renewal Mode

    FIRMWARE RENEWAL MODE Equipment Required [Update procedure] 1. Plug in the AC power cord. a. USB storage device 2. Press [ ] button on the remote control unit to turn b. Remote Control Unit off (standby). 3. Check “STAND BY” indicator (Red LED) lighting. Firmware Update Procedure 4.
  • Page 21: Troubleshooting

    TROUBLESHOOTING FLOW CHART NO.1 The power cannot be turned on. See FLOW CHART No.2 <The fuse blows out.> Is the fuse (F601) normal? Check if there is any leak or short-circuiting on the primary circuit component, and service it if defective. (IC605, Q601, Q602, D602, D604, D605, D607, T601, R602) Is the AL+33V line voltage normal?
  • Page 22 FLOW CHART NO.5 AL+3.3V is not output. Is approximately 5V voltage supplied to the collector Check D637, C628 and their periphery circuit, and of Q605? service it if defective. Is approximately 4V voltage supplied to the base Check D634 and their periphery circuit, and of Q605? service it if defective.
  • Page 23 FLOW CHART NO.9 PANEL+24V is not output. Is approximately 32V voltage supplied to the cathode of D619? Is approximately 32V voltage outputted to the collector of Q612? Check D617, D636 and their periphery circuit, and service it if defective. FLOW CHART NO.10 PANEL+13V is not output.
  • Page 24 FLOW CHART NO.12 AL+5.5V is not output. Check if there is any leak or short-circuit on the loaded circuit, and service it if defective. FLOW CHART NO.13 P-ON+3.3V is not output. Replace Q606. FLOW CHART NO.14 P-ON+11V is not output. Is approximately 12V voltage supplied to the base of Q609? Replace Q609.
  • Page 25 FLOW CHART NO.16 The key operation is not functioning. Re-install the switches (SW101-SW106) correctly or replace the poor switch. Check the switches (SW101-SW106) and their periphery, and service it if defective. Replace Digital Main CBA Unit. FLOW CHART NO.17 No operation is possible from the remote control unit. Check AL+3.3V line and service it if defective.
  • Page 26 FLOW CHART NO.19 Picture does not appear normally. Check the line between Pin(16, 18) of CN303 and Are the DIF signals outputted to Pin(16, 18) of CN303? Pin(4, 5) of TU10, and TU10(Tuner Unit), and service it if defective. Replace Digital Main CBA Unit or LCD Module Assembly.
  • Page 27: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram A0CN2BLS...
  • Page 28 Video Block Diagram A0CN2BLV...
  • Page 29 Audio Block Diagram A0CN2BLA...
  • Page 30 Digital Signal Process Block Diagram A0CN2BLD...
  • Page 31 Inverter Block Diagram A0CN2BLINV...
  • Page 32 Power Supply Block Diagram A0CN2BLP...
  • Page 33: Schematic Diagrams / Cba And Test Points

    SCHEMATIC DIAGRAMS / CBA AND TEST POINTS Standard Notes WARNING Many electrical and mechanical parts in this chassis have special characteristics. These characteristics often pass unnoticed and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc.
  • Page 34 LIST OF CAUTION, NOTES, AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING PAGES: 1. CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE. 2. CAUTION: Fixed Voltage (or Auto voltage selectable) power supply circuit is used in this unit. If Main Fuse (F601) is blown, first check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply.
  • Page 35 Main 1 Schematic Diagram CAUTION ! NOTE: CAUTION ! Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. The voltage for parts in hot circuit is measured using For continued protection against fire hazard, If Main Fuse (F601) is blown , check to see that all components in the power supply hot GND as a common terminal.
  • Page 36 Main 2 Schematic Diagram 10-4 A0CN2SCM2...
  • Page 37 Main 3 Schematic Diagram 10-5 A0CN2SCM3...
  • Page 38 Main 4 Schematic Diagram 10-6 A0CN2SCM4...
  • Page 39 Function Schematic Diagram 10-7 A0CN2SCF...
  • Page 40 Digital Main 1 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into six and shown as IC3301 (1/7) ~ IC3301 (7/7) in this Digital Main Schematic Diagram Section. 10-8 A0CN2SCD1...
  • Page 41 Digital Main 2 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into six and shown as IC3301 (1/7) ~ IC3301 (7/7) in this Digital Main Schematic Diagram Section. 10-9 A0CN2SCD2...
  • Page 42 Digital Main 3 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into six and shown as IC3301 (1/7) ~ IC3301 (7/7) in this Digital Main Schematic Diagram Section. 10-10 A0CN2SCD3...
  • Page 43 Digital Main 4 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into six and shown as IC3301 (1/7) ~ IC3301 (7/7) in this Digital Main Schematic Diagram Section. 10-11 A0CN2SCD4...
  • Page 44 Digital Main 5 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into six and shown as IC3301 (1/7) ~ IC3301 (7/7) in this Digital Main Schematic Diagram Section. 10-12 A0CN2SCD5...
  • Page 45 Digital Main 6 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into six and shown as IC3301 (1/7) ~ IC3301 (7/7) in this Digital Main Schematic Diagram Section. 10-13 A0CN2SCD6...
  • Page 46 Digital Main 7 Schematic Diagram 1 NOTE: The order of pins shown in this diagram is different from that of actual IC3301. IC3301 is divided into six and shown as IC3301 (1/7) ~ IC3301 (7/7) in this Digital Main Schematic Diagram Section. 10-14 A0CN2SCD7...
  • Page 47 Main CBA & Function CBA Top View NOTE: Because a hot chassis ground is present in the power supply CAUTION ! The voltage for parts in hot circuit is measured using circuit, an isolation transformer must be used when repairing. Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit.
  • Page 48 Main CBA & Function CBA Bottom View NOTE: Because a hot chassis ground is present in the power supply The voltage for parts in hot circuit is measured using CAUTION ! hot GND as a common terminal. circuit, an isolation transformer must be used when repairing. Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit.
  • Page 49: Waveforms

    WAVEFORMS WF1 ~ WF6 = Waveforms to be observed at Waveform check points. (Shown in Schematic Diagram.) Input: PAL Color Bar Signal (with 1kHz Audio Signal) Pin 2 of CN404 Pin 4 of CN404 20µs VIDEO-Y VIDEO-Y 0.2V 0.2V 20µs VIDEO VIDEO 0.2V...
  • Page 50 WF7 ~ WF10 = Waveforms to be observed at Waveform check points. (Shown in Schematic Diagram.) Input: PAL Color Bar Signal (with 1kHz Audio Signal) Pin 22 of CN401 Pin 26 of CN404 WF10 AUDIO(L) AUDIO(L) 0.5V 0.5V 0.5m 0.5ms VIDEO-R VIDEO-R 0.5V...
  • Page 51: Wiring Diagram

    WIRING DIAGRAMS A0CN2WI 12-1...
  • Page 52: Exploded View

    EXPLODED VIEWS Cabinet Digital Main CBA Unit CL302 X3301 CL303 CL404 CL3901 CL301 SP802 CL401 CL802 SP801 CL801 Function CBA LCD1 See Electrical Parts List for parts with this mark. Main CBA AC601 Stand Assembly 13-1 A0CN2CEX...
  • Page 53 Packing X2-1 X2-2 Tape Stand Assembly Tape Packing Tape Packing Tape Some Ref. Numbers are not in sequence. Packing Tape 13-2 A0CN0PEX...
  • Page 54: Mechanical Parts List

    Part No. Comparison Chart of Models and Marks RATING LABEL A0CN2EP ---------- Model Mark RATING LABEL A0CN3EP ---------- LH850-M19 SCREW P-TIGHT 3X10 BIND HEAD+ GBHP3100 LH851-M19 SCREW S-TIGHT M3X6 BIND HEAD+ GBJS3060 SCREW TAP TIGHT M3X10 BIND GBHS3100 HEAD+BLK NI...
  • Page 55: Electrical Parts List

    1000pF/50V or Model Mark CAP CHIP 1608 J/C0G/0.001µF/50V CHD102EYA030 C313 CHIP CERAMIC CAP .(1608) F Z 0.1µF/ CHD1JZ30F104 LH850-M19 50V or LH851-M19 CAP CHIP 1608 Z/Y5V/0.1µF/50V CHD104EYA036 C314 CHIP CERAMIC CAP .(1608) F Z 0.1µF/ CHD1JZ30F104 DIGITAL MAIN CBA UNIT 50V or CAP CHIP 1608 Z/Y5V/0.1µF/50V...
  • Page 56 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. C426 CHIP CERAMIC CAP .(1608) CH J 33pF/ CHD1JJ3CH330 C609 POLYESTER FILM CAP . (PB FREE) CA2A393DT018 50V or 0.039µF/100V J or CAP CHIP 1608 J/C0G/33pF/50V CHD330EYA030 CAP POLYESTER FILM 0.039µF/100V J CA2A393SER02 C428 CHIP CERAMIC CAP .(1608) CH J 33pF/...
  • Page 57 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CAP ELE 220µF/16V/M/85 CEC221TEP001 CAP POLYESTER FILM 0.022µF/100V/J/ CTA223PKR003 PCMT C640 ELECTROLYTIC CAP . 10µF/50V M or CE1JMASDL100 C1003 CHIP CERAMIC CAP .(1608) B K 0.01µF/ CHD1JK30B103 CAP ELE 10µF/50V/M/85 or CEF100KSN001 50V or CAP ELE 10µF/50V/M/85...
  • Page 58 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CAP CHIP 1608 K/X7R/0.01µF/50V CHD103EYA032 CN404 FFC CONNECTOR IMSA-9615S-29A-PP- JC96J29ER007 A or C1033 ELECTROLYTIC CAP . 10µF/50V M or CE1JMASDL100 CONNECTOR PRINT MES 00 6232 029 JC62G29UG026 CAP ELE 10µF/50V/M/85 or CEF100KSN001 006 800+ or CAP ELE 10µF/50V/M/85...
  • Page 59 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. DIODE SWITCHING 1N4148-F0021 NDTZ01N4148F DIODE ZENER HZS4.7NB2TE-EQ QDTB0HZS4R7N D510 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 D629 DIODE ZENER 9V1BSB-T26 or NDTB9R1BST26 DIODE SWITCHING HSS4148TE-E or QDTZ0HSS4148 DIODE ZENER HZS9.1NB2TE-EQ QDTB0HZS9R1N DIODE SWITCHING 1N4148-F0021 NDTZ01N4148F...
  • Page 60 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. D801 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 DIODE ZENER HZS5.1NB2TE-EQ QDTB0HZS5R1N DIODE SWITCHING HSS4148TE-E or QDTZ0HSS4148 D1021 DIODE ZENER 15BSB-T26 or NDTB015BST26 DIODE SWITCHING 1N4148-F0021 NDTZ01N4148F DIODE ZENER HZS15NB2TE-EQ QDTBHZS15NB2 D802 SWITCHING DIODE 1SS133(T-77) or...
  • Page 61 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. WIRE CP CP0.56 XZ40F0XRC001 NPN TRANSISTOR 2SC5343G-AT or NQSG02SC5343 L406 INDUCTOR 0.22µH-J-26T LLAXJATTUR22 NPN TRANSISTOR 2SC5343MG-AT or NQSG2SC5343M L407 INDUCTOR 0.22µH-J-26T LLAXJATTUR22 NPN TRANSISTOR 2SC5343M Y NQSY2SC5343M L408 INDUCTOR 0.22µH-J-26T LLAXJATTUR22 Q606...
  • Page 62 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. TRANSISTOR KTC3198-GR-AT/P or NQS4KTC3198P NPN TRANSISTOR 2SC5343MG-AT or NQSG2SC5343M TRANSISTOR 2SC1815-Y(TE2 F T) or QQSY2SC1815F NPN TRANSISTOR 2SC5343M Y NQSY2SC5343M TRANSISTOR 2SC1815-GR(TE2 F T) or QQS12SC1815F Q1004 TRANSISTOR KTC3198-Y-AT/P or NQSYKTC3198P NPN TRANSISTOR 2SC5343Y-AT or NQSY02SC5343...
  • Page 63 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. NPN TRANSISTOR 2SC5343Y-AT or NQSY02SC5343 TRANSISTOR KTA-1266-GR-AT/P or NQS4KTA1266P NPN TRANSISTOR 2SC5343G-AT or NQSG02SC5343 TRANSISTOR 2SA1015-Y(TE2 F T) or QQSY2SA1015F NPN TRANSISTOR 2SC5343MG-AT or NQSG2SC5343M TRANSISTOR 2SA1015-GR(TE2 F T) or QQS12SA1015F NPN TRANSISTOR 2SC5343M Y NQSY2SC5343M...
  • Page 64 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. RES CARBON FILM T 1/4W J 1.0k Ω or R305 RCX4102T1001 WIRE CP 6113-05603-0220 or XZ40F0SHG001 RES CARBON FILM 1/4W J 1k Ω RCX4102FS002 WIRE CP CP0.56 XZ40F0XRC001 CHIP RES.
  • Page 65 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. RES CHIP 1608 1/10W 0 Ω RES CHIP 3216 1/4W J 680k Ω or RRJ000WAL002 RRX4684YF004 CHIP RES. 1/10W J 1.2k Ω or CHIP RES. 1/4W J 680k Ω R467 RRXAJR5Z0122 RRX4JR7Z0684...
  • Page 66 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. RES CHIP 1608 1/10W J 100 Ω RES CARBON FILM T 1/4W J 2.7k Ω or RRJ101WAL002 R680 RCX4272T1001 CHIP RES. 1/10W J 4.7k Ω or RES CARBON FILM 1/4W J 2.7k Ω R649 RRXAJR5Z0472 RCX4272FS002...
  • Page 67 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. CHIP RES. 1/10W J 4.7k Ω or CHIP RES. 1/10W J 1k Ω or R813 RRXAJR5Z0472 R1020 RRXAJR5Z0102 RES CHIP 1608 1/10W J 4.7k Ω or RES CHIP 1608 1/10W J 1.0k Ω or RRXA472YF002 RRXA102YF002 RES CHIP 1608 1/10W J 4.7k Ω...
  • Page 68 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. RES CARBON FILM T 1/4W J 12k Ω or RES CHIP 1608 1/10W F 100k Ω R1049 RCX4123T1001 RTW1003YF002 RES CARBON FILM 1/4W J 12k Ω CHIP RES. 1/10W F 68k Ω or RCX4123FS002 R1087 RRXAFR5H6802...
  • Page 69 Ref. No. Mark Description Part No. Ref. No. Mark Description Part No. RES CHIP 1608 1/10W J 390k Ω or RRXA394YF002 JK411 JACK RCA PCB S WHITE 01/RCA- JXRJ010YUQ02 101H(WH) or RES CHIP 1608 1/10W J 390k Ω RRJ394WAL002 JACK RCA PCB S (WHITE) 01 MTJ-032- JXRJ010LY031 CHIP RES.
  • Page 70 Ref. No. Mark Description Part No. CHIP RES. 1/10W J 10k Ω or R108 RRXAJR5Z0103 RES CHIP 1608 1/10W J 10k Ω or RRXA103YF002 RES CHIP 1608 1/10W J 10k Ω RRJ103WAL002 CHIP RES. 1/10W J 1k Ω or R109 RRXAJR5Z0102 RES CHIP 1608 1/10W J 1.0k Ω...
  • Page 71 LH850-M19/LH851-M19 A0CN2EP/A0CN3EP 2010-09-15...

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