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Electronic appliance repair tips database - TV (LCD,TFT,Plasma,Digital), Monitor, VCR, DVD recorder and player, Digital camera, Audio equipment, Microwave ovens, Phone systems, Computer repair
Make
Model
Problem
Solution
Date
Found: 10
Mitsubishi
CT21M5B
CT25M5B
Tuning drift mainly at top end of band
Add ( 180K ) & Diode ( IN4148 ) in series cathode of diode to 5V pin 6 Tuner & res to Tuning Voltage line pin 2
14-09-04
Mitsubishi
CT25M5B
Failure of Q552
Order & fit AVM5KIT
14-09-04
Mitsubishi
CT25M5B
Under very poor signal conditions "Herringbone" pa
Fit specially screened RF lead between VCR & TV PtNo H24P001010
14-09-04
Mitsubishi
CT25M5B
T
E/W DISTORTION, LACK OF HEIGHT
REPLACE EEPROM IC
14-09-04
Mitsubishi
CT25M5B
T
Sound int mutes
IC701 micro ST9291N6
14-09-04
Mitsubishi
CT25M5B
T
Sound, no raster
Replace Q6E7 (JC501-R) on the tube base panel (part of the spot-killer circuit). It had a B-E leak and was failing to turn on Q6E8 (2SA950-Y) which in turn robbed the 12 volt feed to pin 2 of the CRT driver chip IC660 (TEA5101B).
14-09-04
Mitsubishi
CT25M5B
T EE4
Field collapse
TEA2031A (IC551) & supply decoupler R516 0R82 safety resistor.
14-09-04
Mitsubishi
CT25M5B
T EE4
Green LED only - prev int off - HT present
No line dr from IC201, no micro activity, replace EEPROM 24C08 & set up
14-09-04
Mitsubishi
EE4
CT25M5B
T
Chopper Tr blows aft few days
Replace Q901 (chopper), R901 (4R7 10W), D909 (3V Zener) and change 220R resistor on the print side of the CRT PCB to 1K2 1/2 watt.
14-09-04
Mitsubishi
EE4
CT25M5B
T
Dead - blows chopper tr s/c
mod, i.e. change the 220R res on print side of CRT base to 1K2 1/2watt,this apparantly prevents a surge from blowing the chopper at switch off
14-09-04
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