Daewoo DPC-7900 Series Service Manual

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Summary of Contents

Page 1 - S er v ice M a nua l

S er v ice M a nua lPortable DVD PlayerModel: DPC-7900 Series S/ M No. : OSPC790001 May. 2005 C aution: In this Manual, s ome parts can be change

Page 2 - DPC-7900 Series

- 6 - (2) POWER FOR TFT 111111 1-10V_TFT+15V_TFT+7.5V_TFTVSYNC#POWDET_MCU+3.3V_TFT+5V_TFT+5V_TRANVIN+3.3V+5VV18+3.3V_TFT+5V_TRAN9VINVOUT9VINCTR_LOA

Page 3 - Revision Record

1111Tr-10VRGNDGNDCC8911BGNDRS-2323246195PD17VccV1.718BC15Vs(Vc)LD(DVD)HOP1200/1200N(1240)D16A1141GND(NC)2VRF720E12Vcc21Fo+Very Important toreduce Nois

Page 4 - ………………………………………

- 8 - (4) SDRAM&FLASH&EEPROM TSOP 48 pinIICDRAMFLASH16Mb32Mb8M 16M 32M FLASHdeleteDQ[0..15]AD[0..7]BA[0..1]DQM[0..1]MA[0..11]A[0..21]A9A3AD3

Page 5 - 1 General Descriptions

- 9 - (5) VIDEO OUTPUT 11TFT I/O2N39043CE2B1TFT_CVBS-10V_TFT9VIN+3.3V_TFT+7.5V_TFT+15V_TFT+5V_TFTASPDIFY[3..6]CVBS_TFTVIDEO_TVINT/EXTP/NASPDIF+5V_TR

Page 6 - 1.2 Information

- 10 - (6) AUDIO OUTPUT 11 1VREF5VVCCAUDVREF5VVREF5VA_IN/OUTRA_IN/OUTLACLKMUTE_DACALRCKACLKABCKASDAT0SDAT0SACLKSLRCKALRCKSBCLKABCKASDAT0DAC_MLSACLKS

Page 7 - 2 Electrical Characteristics

- 11 - 3 Power 3.1 Power Supply  Input voltage: Normal voltage: 100 to 240 Vac. Variation range: 90 to 264 Vac.  Input frequency: Normal frequenc

Page 8

- 12 -  The battery pack shall return to normal operation only after the fault has been removed.  A thermal fuse must be added on the surface of c

Page 9 - 2.4 Schematic Circuit Diagram

- 13 - 4 Dimension & Physical Characteristics 4.1 Outline Dimension  205mm(L) x 163.5mm(W) x 38mm(H) 4.2 Physical Characteristics 1

Page 10 - (2) POWER FOR TFT

- 14 - 4.3 Exploded View 4.3.1 DVD Door & Mainbody_top module

Page 11 - (3) SERVO&MPEG

- 15 - 4.3 Exploded View 4.3.2 Keyboard & Mainbody_top module

Page 12 - 8M 16M 32M FLASH

No.: Revision: 0.1 Date: Service Manual for Portable DVD DPC-7900 Se

Page 13 - (5) VIDEO OUTPUT

- 16 - 4.3 Exploded View 4.3.3 Mecha & Mainbody_bottom module

Page 14 - (6) AUDIO OUTPUT

- 17- 4.3 Exploded View 4.3.4 Mainbody module

Page 15 - 3 Power

- 18 - 4.3 Exploded View 4.3.5 Display module & Mainbody module

Page 16

- 19 - 5 Regulatory Standards 5.1 Safety  UL  FDA 5.2 EMI  CE  FCC 5.3 Ergonomics  Dolby - 15 -  LVD

Page 17 -

- 20 - 6 Service Tools and Equipment 6.1Service Tools and Equipment Table Application Name DVD Testing Disc General General Toolsscrewdriver etc.

Page 18 - 4.3 Exploded View

3. Do not place the disc on a glass surface. It may damage the disc. If this happened, please use a new testing disc adjust DVD player precision.

Page 19

- 22- or death. ● This unit should be situated away from heat source, such as amplifiers, radiators, stoves or any other units producing

Page 20

- 23 - 7 Spare Parts 7.1 Key Parts List Location Part NO Part Name Description Maker Remark GKB2.855.8105MX MEPG Board H

Page 21 - 4.3.4 Mainbody module

- 24 - 8 Trouble Shooting 8.1 Error Code Table CODE Descriptions of Error Note Power Test T01 No power no action T02 Power Led indicator is not

Page 22

- 25- T33 MP3 abnormal sound T34 Audio no waveform (sound) or waveform (sound) abnormal Earphone Test T41 Earphone no sound or the sound has p

Page 23 - 5 Regulatory Standards

Revision Record Date Rev No Section Description 17/ Dec./ 2005 0.1 New edition

Page 24

- 26 - Please replace with a good one. C. Disassemble F/W, replace with a good one or re-plug it to see if the LED lights up when Power ON

Page 25 - 6.3 Notes

- 27 - C. Remove the top cover, check all flat cables in the system to see if they arecorrectly plugged to the fixed positions, or re-plug them. D.

Page 26

- 28 - replace the main board.  T13Disc drive scratches disc  Main Board A. Check the resistors or capacitors adjacent to IC(U17) to see if there

Page 27 - Spare Parts

- 29 - correctly plugged to the fixed positions, or re-plug them. B. Use oscilloscope to measure if Y1 generates 27MHz. If it does not generate said

Page 28 - 8 Trouble Shooting

- 30- D. If the above actions do not work, then check U17 Pin179 and Pin181 to see if there is Y and C signals.E. If the above actions are not worki

Page 29 - T74 TFT PAL color strip

- 31 - B. Remove and dis-assemble U7 with a 16Mbit SDRAM.C. If the above actions are not working, replace the Main Board.  T31Audio /left channe

Page 30 - System down during play

- 32 - B. Check U19,U15 and J4,CON3 to see if there is any cold or hollow soldering and rule out the problem. C. If the above action does not work

Page 31 - Power on unstable

- 33 -  Main Board A. Check U17 to see if there is any cold or hollow soldering and reverse solderingof IC or parts missing. B. If the above actio

Page 32 - No video / abnormal

- 34 - A. Measure the voltages of VGH,VGE,VCC,VDD,VIN and VSS to see if they are correct. B. Check VC1 to see if there is any cold or hollow solderin

Page 33 - Video no video / abnormal

- 35 - of IC or parts missing. E. Check Pin 1 to Pin 16 on U202 for any cold or hollow soldering and reverse soldering of IC or parts missing. F. If

Page 34 - DVD abnormal picture

1. General Descriptions …………………………………………………1.1. Model Features …………………………………………………………1.2. Information…………………………………………………………………2. Electrical Charac

Page 35 - MP3 abnormal sound

- 1 - 1 General Descriptions 1.1 Model Features  Video: DVD Playback, MPEG4(option) ,DivX(DivX Model),Kodak Picture CD compatible & JP

Page 36

- 2 - 1.2 Information Disk Format DVD, VCD, CD, MP3, CD-R, CD-RW, MPEG4 (OPTION),JPEG, Kodak Picture CD, DivX(DivX Model),WMA Video System NTSC / PA

Page 37 - TFT image and color error

- 3 - 2 Electrical Characteristics 2.1 Optical Characteristics Parameter Specifications Unit Screen Size 7.0 (16:9 diagonal) inch Display Format

Page 38 - TFT PAL color strip

- 4 - 2.3 System Block Diagram 2.3.1. The System Block Diagram & the Block's Function Description

Page 39 - TFT ripple

- 5 - 2.4 Schematic Circuit Diagram (1)POWER_MPS 1DELETA9VIN+3.3V+5VNCTR_5VCTR_5VLDO_AV33RFV33NCTR_5V9VIN+5V+3.3VCTR_5VNCTR_5V+3.3VRFV33+3.3

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