MP-Man pdv-78 Manuel utilisateur
Service Manual
(7 Inch) LCD Color Monitor &
DVD Player
mp-man pdv-78
1、Specification.....................................................…...............................................………………… 2
2、Block Diagram.................................…................................................................………………….4
3、General Alignment Instruction.....................................................................…………….....…..5
4、Troubleshooting.........................................................................................……………………….. 7
5、Printed Circuit Board......................................................................................…………………...12
6、Explode View......................................................................................................………………….13
7、IC Block Diagram and Lead Identification.....................................................………………..29
8、Schematic Diagram.......................................................................................……………………..39
SPECIFICATION
Description Condition Unit Limit Nominal Result
Video Signal Level Vp-p 0.7±0.1 0.7
SYNC Lever Vp-p 0.3±0.1 0.3
Video out level Vp-p 1.0±0.2 1.0
Video out level(No Loader)
75% color bar, 75
0hm
Vp-p 2.0±0.2 2.0
Y(100% color bar) mV 700±140 700
S-VIDEO out level
C(100% color bar) mV 880±176 880
CD 1KHz/0dB V 0.6±0.2 0.7
Audio out level
DVD 1KHz/0dB V 1.4±0.2 1.25-1.4
20Hz dB ≤±3 0
125Hz dB ≤±3 0
10KHz dB ≤±3 0
Frequency Response
(20 Hz – 20 kHz)
20KHz dB ≤±3 0
Signal-to-noise ratio
(add A)
Infinity
zero/-&dB/L&R
dB ≥75 ≥75
Audio distortion & noise 1KHz/0dB/L&R dB ≤-65 -65
Dynamic range 1KHz/-60dB dB ≥85 ≥85
R/L Cross sound 1KHz/0dB/L&R dB ≥45 ≥45
1 kHz Channel Unbalance 1KHz/0dB/L&R dB ≤3 0
Standby W 0 0
Power Consumption
DC 9V Rating
(DVD+Monitor) W ≤12 ≤12
Eccentricity A-BEX TDV-552 um ≥100 100
Scratch A-BEX TDV-541 mm ≥1.6 1.6
Black dot A-BEX TDV-PW525CW mm ≥￠0.8 0.8
Finger Print A-BEX TDV-PW525CW um ≥￠65 65
Vertical Deviation A-BEX TDV-MW533CW mm ≥0.6 0.6
HEADPHONE OUTPUT 1KHz,400mV mW 3±2 3
HEADPHONE Noise No Signal mV ﹤1mV ﹤1mV
L 1KHz/0dB mW 500±100 500 SPK MAX Output
(DVD) R 1KHz/0dB mW 500±100 500
L 1KHz/0dB mW 500±100 500 SPK MAX Output
(AV IN) R 1KHz/0dB mW 500±100 500
HEADPHONE S/N
(add A)
Infinity
zero/-&dB/L&R
dB ≥75 75
SPK S/N
(add A)
Infinity
zero/-&dB/L&R
dB ≥50 50
20Hz dB ≤±3 0
125Hz dB ≤±3 0
10KHz dB ≤±3 0
HEADPHONE RESP
(20Hz~20KHz)
20KHz dB ≤±3 0
20Hz dB ≤±3 0
125Hz dB ≤±3 0
10KHz dB ≤±3 0
Amplifier Frep Resp
(20Hz~20KHz)
20KHz dB ≤±3 0
BLOCK DIAGRAM
LCD
DVD PART
GENERAL ALIGNMENT INSTRUCTION
The Main PCB of Monitor Modification:
1. Input voltage is 6.8V-16V, input signal is test circuit BY 5418.
2. Adjust VR1 to get good performance.
TROUBLESHOOTING
SYMPTOM CAUSE REMEDY
LCD MONITOR PART
1) No Picture Defective IC U2 Replace U2 ( VX1827 )
2) No Picture, Picture no
Good
Defective IC AT8430.
Replace. C AT8430
3) Luminesce no good Defective IC U3 Replace U3 ( 4558/3414 )
4) Color is no good Defective C214.C216.C218 Replace C214.C216.C218
( 1UF )
5) SYNC no good Defective IC U2 Replace U3 ( VX1827 )
6) TINT no good Defective IC U2 Replace U3 ( VX1827 )
7) NO Picture Defective IC U3 OR HV U1
Replace U3( VX1827 ) OR HV
U1(MP1026)
8) Picture no good Defective Y1 Replace Y1 ( 20MHZ )
9) Brightness no good Defective IC U3 Replace U3 ( 4558/3414 )
TROUBLESHOOTING
SYMPTOM CAUSE REMEDY
DVD PART
1) No Power
Power source is not correct.
The positive and negative does
not match the unit.
Power button defective.
Defective triode IC U1 OR Q1
Replace power source.
Charge the position of positive
and negative.
Replace power button.
Replace U1 ( 8521 ) OR Q1
( SI2307 )
2) No Picture
Defective IC T3
Defective IC U10 OR T4
Defective IC U2
Replace T3 ( 24C02 ).
Replace U10（64M SDRAM）
OR T4（FLASH:29LV800）.
Replace U2 ( MT1389E/E )
3) No Sound Defective IC U6
Defective IC U5
Replace U6 ( C4558 ).
Replace U5 ( TDA2822 )
4) Sound no good Defective IC U6
Defective IC U5
Defective V2
Replace U6 ( C4558 ).
Replace U5 ( TDA2822 )
Replace V2 ( 10KΩ)
5) Can not read DISC Defective IC U3
PICK-up Laser is defective.
Defective IC U2
Replace U3 ( CD5654 )
Replace pick up.
Replace U2 ( MT1389E/E )
6) No key function Defective IC U2 Replace U2 ( MT1389E/E ).
7) No remote control function Defective T1
Key is Defective.
Replace T1
( NTL6OH380AF3 )
Replace keys.
8) LCD NO Picture Defective U2 Replace U2 ( MT1389E/E )
PRINTED CIRCUIT BOARD
Monitor Main PCB
Top View
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