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)
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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
... if Fuse is 13.5V
Check to 32.
2. cn
Error Detection Process
1. AGC Adjustment
Receive 60dBμ (1mV) ..., ZD201 8v,
is normal
Abnormal Normal
Check the control voltage of load
Normal
Check to see if rectifying tube... balance adjustment
a) CRT cut off adjustment
1. Maintenance Service and Trouble shooting
2. voltage is normal
Normal
ThTehe ffaailiulrue reofhoorizfontahl ...
Service Manual - Page 7
... 、52、
53 of IC201 to video amplifying
Check 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
Abnormal
Test the base voltage of Q402
Normal
Abnormal
Check the...
Service Manual - Page 8
...is
open .
No
Inspect SAW101、 IC201and PIF part
Yes
Antenna or tuner is normal
Yes Change IC201 and
repair circuit
Normal
No
Inspect IC201 and peripheral components of IC401... 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 if V501 is open or not well welded
Yes
...
Service Manual - Page 10
...
OK OK 0 ~ 127
0 ~ 7
Preset
OK OK 35
7
Remark
◆ ◆ ◆
◆
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 ~ 31 0 ~ 1
0 ~ 1 0 ~ 1 0 ~ 127 0 ~ 127 0 ~ 127
Preset
35 21 0
0 0 57 79 57...
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 ...;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 ~ 255
LOGO...
Service Manual - Page 12
...
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 XTAL CHROMA GND...
Service Manual - Page 18
... sound.
1）
Because the AUDIO DAC is built in normal status,
especially check if the A0~A15 of FLASH have problems.
2) Servo part of MT1389D or the communication between MT1389D and motor Driver IC SA5668.
2) Not output from FOSO、TRSO.
if there are in MTK1389D IC.you need to DMSO、FMSO...
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