Text preview for : CW28C73NS_4.pdf part of Samsung chassis KS3A service manual
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Plug in Power Cord
Samsung Electronics
ON Check LED lamp OFF Normal Normal Check and Replace the MICOM Normal Check and Replace IC903 Check IC901 MICOM Input Voltage Abnormal Normal Abnormal Check the MICOM Power #59 With Remote Controller Replace the MICOM Abnormal Replace Q908 Normal Normal Check IC802, IC803 Replace IC802, IC803 Normal Check IC201S VDP H-OUT #50 Abnormal Replace IC201S Normal Check Q401 H-TR Replace Q401 Normal Check 135V Line Check PC801S, IC801S Normal Replace FBT Abnormal Abnormal Check R828 and D805 Abnormal Check IC801S and FP801S Normal Check and Replace R828 or D805 Abnormal Check IC804 Input Voltage Abnormal Normal Check and Replace IC804 Check D801 and D811 Abnormal Abnormal Replace D801 or D811 Check IC903 3.3V Regulator Input Voltage Normal Replace Q908
5-1 No Power
5. Troubleshooting
Abnormal
Check MICOM IIC #5, #6
Check Level Shifter Q909, Q910 Output(If 2N7000 Output has the DC Component over 0.7V, it is broken)
Normal
Abnormal
Check MICOM IIC #2, #3
Abnormal
Replace Q909, Q910
Normal
Check IC902 EEPROM
Replace EEPROM(IC902)
Normal
Check IC201S
Note : When you check whether any component is normal, you must let the output pin be open in order not to be affected by the side of output.
Troubleshooting
5-1
No Picture, but sound is in normal operation
Normal
Turn the VR of FBT, higher screen voltage and Check the Deflection is in Normal Operation (If the deflection is in operation, flyback signal is appeared)
Abnormal
Normal
Check CRT PCB RK, BK, GK
Abnormal
Normal
Check IC201S #31
Abnormal
Check Heater Voltage Abnormal Normal Check CRT and FBT
Check HIC202, HIC203, HIC204 Output
Abnormal
Check 8V Check IC201S #63 or #59 Normal Abnormal Normal Normal
Abnormal
Check DZ202
Abnormal
Check CRT and FBT
Normal
Check IC803 Replace IC201S Check 200V, 16.5V Line Check Tuner CVBS Output Check IC301
Replace DZ202
Replace IC201S
5-2 No Picture
Troubleshooting
5-2
Samsung Electronics
Troubleshooting
5-3 No Sound
No Sound, but Picture is in normal operation
Normal
Check the CN602 Connection and Signal
Abnormal
Check the Speaker Wire Connection
Normal
Check 14V Line
Abnormal
Check IC602 #7 (If the pin is in low state, Sound is mute) Normal
Abnormal
Check FA803S
Check D816, Q906 Check IC601 #24, #25 Normal Replace IC602 Check IC601 Input Voltages (5V,8V) Normal Check the coils around IC601 Check IC601 Input Signal Normal Replace IC601 Check the Tuner Abnormal Abnormal Abnormal
Samsung Electronics
5-3
MEMO
5-4
Samsung Electronics