FUNAI LH7-M22BB Service Manual
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FUNAI LH7-M22BB Service Manual

22" color lcd television
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SERVICE MANUAL

This Service Manual is for the
Serial No. Label
LH7-M22BB (A9372EP) model.
For the LH7-M22BB (A9372EP)
P27910001 - A9372EP
MANUFACTURED :
JULY
2009
P
model, the letter (A9372EP) is
printed on the Serial Number Label
"A9372EP"
on the back of the unit. Refer to the
Serial Number Label on the right.
22" COLOR LCD TELEVISION
LH7-M22BB

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  • Page 1: Service Manual

    SERVICE MANUAL This Service Manual is for the Serial No. Label LH7-M22BB (A9372EP) model. For the LH7-M22BB (A9372EP) P27910001 - A9372EP MANUFACTURED : JULY 2009 model, the letter (A9372EP) is printed on the Serial Number Label "A9372EP" on the back of the unit. Refer to the Serial Number Label on the right.

  • Page 2: Table Of Contents

    22″ COLOR LCD TELEVISION LH7-M22BB 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: Specifications

    < 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. Audio Distortion 500mW: Lch/Rch 1.5/1.5 3.0/3.0 -6dB: Lch 70 to 10 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: Instructions For Handling Semi- Conductors

    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-2) (S-4) (S-2) (S-2) [2] Rear Cabinet (S-3) (S-2) [1] Stand Assembly (S-1) Fig. D1 A9372DC...
  • Page 14 [14] Front Cabinet [9] Digital Main CBA Unit [7] Jack (S-12) [8] Shield Holder [12] Junction (S-10) (S-12) (S-9) [11] Speaker (H-1) Speaker Holder (S-11) (S-14) (S-15) (S-7) [13] Function CBA [11] Speaker (S-14) (S-8) [6] Jack CBA [5] HP Jack Speaker Holder Holder...

  • Page 15: Wiring Diagram

    TV Cable Wiring Diagram To LCD Module Assembly Digital Main CBA Unit Main CBA CN3901 CN301 CN1550 CN402 CN3701 CN403 CN3703 CN1650 CN404 CN3702 CN401 CN3704 CN1750 CN103 CN801 CN102A AC CORD Jack CBA CN802 CN452 To Speaker To Speaker Junction CBA CN102B CN101A...

  • Page 16: Electrical Adjustment Instructions

    ELECTRICAL ADJUSTMENT INSTRUCTIONS 1. Purity Check Mode General Note: “CBA” is abbreviation for “Circuit Board Assembly.” This mode cycles through full-screen displays of red, Note: Electrical adjustments are required after green, blue, and white to check for non-active pixels. replacing circuit components and certain 1.
  • Page 17 2. VCOM Adjustment. 4. Auto Calibration [PC] Purpose: To bring the color adjustment of PC into Test Point Adj. Point standard alignment. Screen Symptom of Misadjustment: If this adjustment is buttons incorrect, PC signals do not reproduce the M. EQ. Spec.

  • Page 18: White Balance Adjustment

    The following adjustment normally are not attempted in 4. Enter the Service mode. Press [ -] button on the the field. Only when replacing the LCD Panel then adjust service remote control unit and select “C/D” mode. as a preparation. 5.

  • 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. To enter the service mode, press the service button on the service remote control unit. (Refer to page 5-1.) - To cancel the service mode, Press [ ] button on the remote control unit.

  • Page 20: 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 21 FLOW CHART NO.5 AL+3.3V is not output. Is approximately 7V 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 22 FLOW CHART NO.9 AL+15V(2) is not outputted. Check D612, D620, C613 and their periphery circuit, and service it if defective. Check D643, D644 and their periphery circuit, and Is approximately 13V voltage supplied to the base of service it if defective. Q618? Replace Q618.
  • Page 23 FLOW CHART NO.13 AL+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.14 P-ON+3.3V is not output. Replace Q606. FLOW CHART NO.15 P-ON+11V is not output. Is approximately 12V voltage supplied to the base of Q609? Replace Q609.
  • Page 24 FLOW CHART NO.17 No operation is possible from the remote control unit. Check AL+3.3V line and service it if defective. Replace the RS101 (remote control receiver) or remote control unit. Check the line between Pin(1) of RS101 (remote control receiver) and Pin(13) of CN403, and service it if defective.
  • Page 25 FLOW CHART NO.19 Picture does not appear normally. Check the line between Pin(16, 18) of CN403 and Are the DIF signals outputted to Pin(16, 18) of CN403? Pin(4, 5) of TU10, and TU10(Tuner Unit), and service it if defective. Replace Digital Main CBA Unit or LCD Module Assembly.

  • Page 26: Block Diagrams

    BLOCK DIAGRAMS System Control Block Diagram A9372BLS...
  • Page 27 Video Block Diagram A9372BLV...
  • Page 28 Audio Block Diagram A9372BLA...
  • Page 29 Digital Signal Process Block Diagram A9372BLD...
  • Page 30 Inverter Block Diagram A9372BLINV...
  • Page 31 Power Supply Block Diagram A9372BLP...

  • Page 32: 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 33 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 34 Main 1/4 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 35 Main 2/4 Schematic Diagram A9372SCM2...
  • Page 36 Main 3/4 Schematic Diagram A9372SCM3...
  • Page 37 Main 4/4 Schematic Diagram A9372SCM4...
  • Page 38 Function & Junction Schematic Diagram A9372SCF...
  • Page 39 Jack Schematic Diagram A9372SCJ...
  • Page 40 Digital Main 1/7 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 (1/6) ~ IC3301 (6/6) in this Digital Main Schematic Diagram Section. A9372SCD1...
  • Page 41 Digital Main 2/7 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 (1/6) ~ IC3301 (6/6) in this Digital Main Schematic Diagram Section. 9-10 A9372SCD2...
  • Page 42 Digital Main 3/7 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 (1/6) ~ IC3301 (6/6) in this Digital Main Schematic Diagram Section. 9-11 A9372SCD3...
  • Page 43 Digital Main 4/7 Schematic Diagram 9-12 A9372SCD4...
  • Page 44 Digital Main 5/7 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 (1/6) ~ IC3301 (6/6) in this Digital Main Schematic Diagram Section. 9-13 A9372SCD5...
  • Page 45 Digital Main 6/7 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 (1/6) ~ IC3301 (6/6) in this Digital Main Schematic Diagram Section. 9-14 A9372SCD6...
  • Page 46 Digital Main 7/7 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 (1/6) ~ IC3301 (6/6) in this Digital Main Schematic Diagram Section. 9-15 A9372SCD7...
  • Page 47 Main CBA Top View Because a hot chassis ground is present in the power CAUTION ! NOTE: supply circut, an isolation transformer must be used. Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. The voltage for parts in hot circuit is measured using Also, in order to have the ability to increase the input If Main Fuse (F601) is blown , check to see that all components in the power supply hot GND as a common terminal.
  • Page 48 Main CBA Bottom View Because a hot chassis ground is present in the power CAUTION ! NOTE: supply circut, an isolation transformer must be used. Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit. The voltage for parts in hot circuit is measured using Also, in order to have the ability to increase the input If Main Fuse (F601) is blown , check to see that all components in the power supply hot GND as a common terminal.
  • Page 49 Function CBA Top View Junction CBA Junction CBA Top View Bottom View BA9370F01021 Function CBA Bottom View BA9370F01021A 9-18...
  • Page 50 Jack CBA Top View JACK CBA Bottom View 9-19 BA9370F01021B...

  • Page 51: 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 0.2V 20µs VIDEO 0.2V 20µs Pin 27 of CN401 Pin 6 of CN404...
  • Page 52 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) 0.5V 0.5ms VIDEO-R 0.5V 20µs Pin 29 of CN404 VIDEO-B 0.5V...

  • Page 53: Wiring Diagram

    WIRING DIAGRAMS A9372WI 11-1...

  • Page 54: Exploded View

    EXPLODED VIEWS Cabinet Digital Main CBA Unit CL302 X3301 CL303 CL404 CL3901 CL301 Junction CBA CL401 SP802 Jack CBA CL802 CL103 SP801 Function CBA CL801 LCD1 See Electrical Parts List Main CBA for parts with this mark. AC601 Stand Assembly 12-1 A9372CEX...
  • Page 55 Packing X2-1 X2-2 X2-3 Stand Tape Assembly Packing Tape Tape Packing Tape Packing Tape Some Ref. Numbers are not in sequence. Packing Tape 12-2 A9372PEX...

  • Page 56: Mechanical Parts List

    MECHANICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. ! have special characteristics important to safety. RATING LABEL A9372EP ---------- Before replacing any of these components, read SCREW P-TIGHT 3X10 BIND HEAD+ GBHP3100 carefully the product safety notice in this service SCREW S-TIGHT M3X6 BIND HEAD+ GBJS3060 manual.

  • Page 57: Electrical Parts List

    ELECTRICAL PARTS LIST PRODUCT SAFETY NOTE: Products marked with a Ref. No. Description Part No. ! have special characteristics important to safety. C409 CHIP CERAMIC CAP .(1608) CH J 100pF/50V CHD1JJ3CH101 Before replacing any of these components, read C410 CHIP CERAMIC CAP .(1608) CH J 100pF/50V CHD1JJ3CH101 carefully the product safety notice in this service C416...
  • Page 58 Ref. No. Description Part No. Ref. No. Description Part No. C637 ELECTROLYTIC CAP . 470µF/10V M CE1AMASDL471 C1553 CAP CERAMIC HV 15pF/3.15KV/SL/J CCD3FJASL150 C638 CHIP CERAMIC CAP .(1608) F Z 0.1µF/50V CHD1JZ30F104 C1554 ELECTROLYTIC CAP . 10µF/50V M CE1JMASDL100 C639 ELECTROLYTIC CAP .
  • Page 59 Ref. No. Description Part No. Ref. No. Description Part No. D404 DIODE ZENER 5V6BSB-T26 NDTB5R6BST26 DIODE SWITCHING 1N4148-F0021 NDTZ01N4148F D406 DIODE ZENER 5V6BSB-T26 NDTB5R6BST26 D628 DIODE ZENER 5V6BSB-T26 NDTB5R6BST26 D408 DIODE ZENER 5V6BSB-T26 NDTB5R6BST26 D629! DIODE ZENER 8V2BSA-T26 NDTA8R2BST26 D410 DIODE ZENER 3V9BSB-T26 NDTB3R9BST26 D631!
  • Page 60 Ref. No. Description Part No. Ref. No. Description Part No. DIODE SWITCHING 1N4148-F0021 NDTZ01N4148F DIODE SWITCHING 1N4148-F0021 NDTZ01N4148F D802 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 D1558 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 DIODE SWITCHING HSS4148TE-E or QDTZ0HSS4148 DIODE SWITCHING HSS4148TE-E or QDTZ0HSS4148 DIODE SWITCHING 1N4148-F0021 NDTZ01N4148F DIODE SWITCHING 1N4148-F0021...
  • Page 61 Ref. No. Description Part No. Ref. No. Description Part No. D1663 SWITCHING DIODE 1SS133(T-77) or QDTZ001SS133 IC SWITCH 4053L-S16-R or NSZBA0TUTC04 DIODE SWITCHING HSS4148TE-E or QDTZ0HSS4148 IC ANALOG MULTIPLEXERS NSZBA0SSS002 HCF4053M013TR or DIODE SWITCHING 1N4148-F0021 NDTZ01N4148F IC ANALOG MULTIPLEXER CD4053BNSR NSZBA0TTY093 D1664 SWITCHING DIODE 1SS133(T-77) or...
  • Page 62 Ref. No. Description Part No. Ref. No. Description Part No. TRANSISTOR 2SC2120-O(TE2 F T) or QQS02SC2120F TRANSISTOR 2SA1015-GR(TE2 F T) or QQS12SA1015F TRANSISTOR KTC3203-Y-AT/P or NQSYKTC3203P PNP TRANSISTOR 2SA1980Y-AT or NQSY02SA1980 TRANSISTOR KTC3203-O-AT/P or NQS0KTC3203P PNP TRANSISTOR 2SA1980 G or NQSG02SA1980 NPN TRANSISTOR 2SC5344 Y or NQSY02SC5344...
  • Page 63 Ref. No. Description Part No. Ref. No. Description Part No. NPN TRANSISTOR 2SC5343Y-AT or NQSY02SC5343 NPN TRANSISTOR 2SC5343Y-AT or NQSY02SC5343 NPN TRANSISTOR 2SC5343G-AT or NQSG02SC5343 NPN TRANSISTOR 2SC5343G-AT or NQSG02SC5343 NPN TRANSISTOR 2SC5343MG-AT or NQSG2SC5343M NPN TRANSISTOR 2SC5343MG-AT or NQSG2SC5343M NPN TRANSISTOR 2SC5343M Y NQSY2SC5343M NPN TRANSISTOR 2SC5343M Y...
  • Page 64 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES. 1/10W J 390 Ω or TRANSISTOR 2SC1815-GR(TE2 F T) or QQS12SC1815F RRXAJR5Z0391 RES CHIP 1608 1/10W J 390 Ω NPN TRANSISTOR 2SC5343Y-AT or NQSY02SC5343 RRXA391YF002 CHIP RES.(1608) 1/10W 0 Ω or NPN TRANSISTOR 2SC5343G-AT or NQSG02SC5343 RRXAZR5Z0000...
  • Page 65 Ref. No. Description Part No. Ref. No. Description Part No. CHIP RES.(1608) 1/10W 0 Ω or WIRE CP STP-S-0.60 or XZ40F0REN002 R470 RRXAZR5Z0000 RES CHIP 1608 1/10W J 0 Ω WIRE CP 6113-05603-0220 or XZ40F0SHG001 RRXA000YF002 RES CARBON FILM T 1/4W J 47k Ω or WIRE CP CP0.56 XZ40F0XRC001 R471...
  • Page 66 Ref. No. Description Part No. Ref. No. Description Part No. RES CHIP 1608 1/10W F 680 Ω CHIP RES.(1608) 1/10W F 8.2k Ω or RTW6800YF002 RRXAFR5Z8201 CHIP RES. 1/10W F 680 Ω or RES CHIP 1608 1/10W F 8.20k Ω R627 RRXAFR5H6800 RTW8201YF002...
  • Page 67 Ref. No. Description Part No. Ref. No. Description Part No. RES CHIP 1608 1/10W J 8.2 Ω CHIP RES. 1/10W J 56k Ω or RRXA8R2YF002 R1016 RRXAJR5Z0563 CHIP RES. 1/10W J 8.2 Ω or RES CHIP 1608 1/10W J 56k Ω R804 RRXAJR5Z08R2 RRXA563YF002...
  • Page 68 Ref. No. Description Part No. Ref. No. Description Part No. RES CHIP 1608 1/10W F 7.50k Ω METAL OXIDE FILM RES. 2W J 0.22 Ω RTW7501YF002 R1508 RN02R22ZU001 CHIP RES. 1/10W F 4.7k Ω or RES CARBON FILM T 1/4W J 33k Ω or R1061 RRXAFR5H4701 R1509...
  • Page 69 Ref. No. Description Part No. Ref. No. Description Part No. RES CARBON FILM T 1/4W J 33k Ω or R1709 RCX4333T1001 JK404 JACK RCA PCB S WHITE 01/RCA-101H(WH) or JXRJ010YUQ02 RES CARBON FILM 1/4W J 33k Ω RCX4333FS002 JACK RCA PCB S (WHITE) 01 MTJ-032-04B-41 JXRJ010LY031 CHIP RES.
  • Page 70 Ref. No. Description Part No. Ref. No. Description Part No. WIRE CP CP0.56 XZ40F0XRC001 TRANSISTOR KTC3199-GR-AT/P or NQS4KTC3199P R431 WIRE CP STP-S-0.50 or XZ40F0REN001 TRANSISTOR KTC3198-GR-AT/P or NQS4KTC3198P WIRE CP STP-S-0.60 or XZ40F0REN002 TRANSISTOR 2SC1815-Y(TE2 F T) or QQSY2SC1815F WIRE CP 6113-05603-0220 or XZ40F0SHG001 TRANSISTOR 2SC1815-GR(TE2 F T) or QQS12SC1815F...
  • Page 71 Ref. No. Description Part No. MISCELLANEOUS CHIP RES.(1608) 1/10W 0 Ω or JS902 RRXAZR5Z0000 RES CHIP 1608 1/10W J 0 Ω RRXA000YF002 CHIP RES.(1608) 1/10W 0 Ω or JS903 RRXAZR5Z0000 RES CHIP 1608 1/10W J 0 Ω RRXA000YF002 RS101 SENSOR REMOTE RECEIVER KSM-712TH2E USESJRSKK044 SENSOR REMOTE RECEIVER KSM-712TH2M USEJRS0KK001 JUNCTION CBA...
  • Page 72 LH7-M22BB A9372EP 2009-07-31...

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