Memorex MT2025D - 20" CRT TV Support and Manuals
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Memorex Mt2025d
41/5000 1. what is the vertical ic is that it uses -
41/5000 1. what is the vertical ic is that it uses -
(Posted by josebalbu7 5 years ago)
I Have A Memorex I Just Want To Know How ,much Is It Worth
how much is my memorex 20 inch tv worth
how much is my memorex 20 inch tv worth
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Popular Memorex MT2025D Manual Pages
Service Manual - Page 1
SERVICE MANUAL
Colour Television
Haier model:
21F7A
Customer model:
MT2025D
l FEATURES
l DVD-TV 21" COMBO l AUTO TUNE/181 CHANNES l DVD/VCD/SVCD/CD/CD-R/CD-RW/JPEG/MP3 COMPATIBLE l FORMATO DE VIDEO 4:3PS、4:3LB l DOLBY AC-3 DECODE l ...
Service Manual - Page 2
Safety precautions 3 2. All ICs voltages 10 8. CONTENTS
1. Replacement of memory IC 5 4. Service adjustment 5 5. . Purity / convergence adjustment 11 9. cn
Test point waveform 10 7. f i nepr i nt . ICs functional description 8 6. DVD maintenance 13
2
PDF pdf Fact or y Pr o www. com. TV block diagram 4 3.
Service Manual - Page 3
... are often not evident from each measurement. Move the resistor connection to each exposed metal part, particularly any repair has been made to an appliance rated 200V or more sensitivity in Service manual. Any voltage measured must be the exact replacements or alternatives approved by the manufacturer of overheating should be checked or adjusted (See...
Service Manual - Page 5
.... 3) Check the setting value of the SYSTEM default value of corresponding factory menus. SERVICE ADJUSTMENT
Specific operation: use memory ...TV uses memory IC. Geometrical adjustment
Receive NTSC standard complete pattern signal. 3. PROCEDURE FOR REPLACING MEMORY IC
(1) Power off Switch the power off and unplug the power cord from AC outlet.
(2) Replace IC Be sure to use remote controller...
Service Manual - Page 6
...32.
2. cn
Error Detection Process
1. ...control voltage of load
Normal
Check to see if rectifying tube
is normal
Abnormal Test to see all terminal
Resistance of Q207 or
CPU power pin
Check switch power unit
Abnormal
Check to get colour temperature 9300K ±3 JND.
CRT cut off and white balance adjustment
a) CRT cut off adjustment
1. Maintenance Service and Trouble...
Service Manual - Page 7
...or check
Normal
Abnormal
Check X201、IC201 and peripheral circuit of IC201
2
Check +8V ,+5V power
PDF pdf Fact or y Pr o wÿww. com. YES NO
Check the circuit from... to see if +8V voltage is
normal
Higher Lower
InspectT402、R427
etc. Maintenance Service and Trouble shooting
2
No raster
Normal
Whether G2 voltage is normal
Abnormal
Test filament voltage
Normal
...
Service Manual - Page 8
... PIF part
Yes
Antenna or tuner is normal
Yes Change IC201 and
repair circuit
Normal
No
Inspect IC201 and peripheral components of IC401
and IC401 itself
No
Inspect +28V power supply
... with customer remote controller. Bright line flashes for a moment
Yes
Check to see if voltage of pin2 at range RΧ1K. Noise on picture just disappears. Maintenance Service and Trouble shooting
3
...
Service Manual - Page 9
Maintenance Service and Trouble shooting
5 Picture exists but no sound
Make C713/C714 open . Lack of red
Check to see ...Multimeter is abnormal. f i nepr i nt . Inspect IC701 and peripheral
components of IC201
No
Inspect +16V power supply
6. Touch No.6 OR No.8 of Q702 with
No noise
Power amplifier is at band RΧ1K. Red probe connect to No.3 of IC701 with black probe to see if...
Service Manual - Page 10
...27880;：
0 ~ 63 0 ~ 63
0 ~ 63 0 ~ 63 0 ~ 63
Preset
14 20 2
29 32 32 32 32 40
Remark
★ ★ ★
Description Horizontal shift Vertical amplitude Vertical...
◆ ◆ ◆
◆
Description
Picture IF adjust Sound frequency adjust AGC adjust
Video demodulation output voltage control
P5：
Items
OSD HP OSD VP H TONE
A OSD OSD L TITLE MENU MENU HL
0 ~ 63 0...
Service Manual - Page 11
...out; 1 = low out(fc = 700kHz) Black voltage extend function switch; 0 = ON; 1=OFF GAMMA adjust control; 0 = OFF; 1~3 = ON(3 mode) AUTO brightness and contrast limit; 0 = AUTO contrast limit; 1...ON = Y；OFF = N DVD signal format，0:CVBS；1:YC；2:YUV；3：hold Power off DVD off delay time Tv to DVD black screen time
P7：
Items
ON DLY T 0 ~ 15
AVS MUTE TIM 0...
Service Manual - Page 12
... OUT VIF VIDEO OUT VIF GND
PIN 1 2 3 4 5 6 7 8 9
10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
30 31 32
33 34 35
SP00/14bPWM SP01/PWM SP02/PWM SP03/PWM TEST0 P04.../AD2 P05/AD1 P06/TIM31
SIF auto phase control
8V POWER V RAMP(+) VRAMP CAP
SIF auto phase control filter
5V POWER Horizontal SIGNAL OUT FBP IN GND VRAMP AGC Cb IN YcbCr Cr IN YcbCr C-APC ...
Service Manual - Page 14
... (TFA9800J)
Symbol
PIN Function
Symbol
-INV1
1
Non-inverting input 1 Vp
SGND
2
Signal ground
M/SS
SVRR
Out 1 PGND OUT2
3
Supply voltage ripple rejection output
-INV2
4
Output 1
5
Power ground
6
Output 2
4. U101：Tuner
PIN Function 1 Nc 2 Tu 3 Rf agc 4 SCL 5 SDA 6 Btl
PIN Function 7 +5V 8 IFA1 9 IF AGC 10 IFD 1OUT 11 IFD...
Service Manual - Page 15
... voltages
R2J10165G
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 V 0 0.02 4.9 0.03 0 4.72 0.04 0.15 2.05 8.04 2.99 2.36 3.2 5 0.83 0.93
PIN 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 V 0 2.04 1.15 1.15 2.97 3.2 0 3.76 3.91 5.59 2.28 8.73 3.29 1.97 5 2.73
PIN...
Service Manual - Page 18
... .
1）
Check if all the a.m. Secondly, check motor driver to drive the servo
system，pick up action（no light, no OSD display. parts are good, then MT1389D will start
initialization check for playing is any power supply to be the problem on motor Driver or its corresponding
circuit.
7. cn After the LOGO of...
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