MP-Man pdv-78 User manual

Service Manual
(7 Inch) LCD Color Monitor &
DVD Player
mp-man pdv-78
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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
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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
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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
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BLOCK DIAGRAM
LCD
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DVD PART
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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.
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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 )
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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 )
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PRINTED CIRCUIT BOARD
Monitor Main PCB
Top View
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Monitor Main PCB
Bottom View
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Monitor HV PCB
Top View Bottom View
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DVD Main PCB
TOP View
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DVD Main PCB
Bottom View
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EXPLODED VIEW
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IC BLOCK DIAGRAM & DESCRIPTION
IC VX1827
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IC BLOCK DIAGRAM & DESCRIPTION
IC VX1827
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IC BLOCK DIAGRAM & DESCRIPTION
IC VX1827
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IC BLOCK DIAGRAM & DESCRIPTION
IC A8430K
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IC BLOCK DIAGRAM & DESCRIPTION
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