Text preview for : 04_Troubleshooting.pdf part of Samsung HC-R4755W Part 1 of Samsung HC-R4555W Service Manual (including schematics).
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Troubleshooting
3. Troubleshooting
3-1 Opening the Set and Replacing Assemblies
3-1-1 Replacing and Repairing Each Assembly (Opening the Back Cover)
Remove all indicated screws on the rear side of the Set
Repair or replace the required Assembly
MAIN
CG Module
DY JACK
SUB
Samsung Electronics
3-1
Troubleshooting
3-1-2 Replacing and Repairing the CRT-PCB (Opening the Rear Cover)
Remove all indicated screws and open the Rear Cover.
Remo v e t he F r ont - Panel and PWR- Co nt r o l
Remo v e t he Sc r ew - L ef t bac k
Remo v e t he Sc r ew - Ri g ht B ac k
Remo v e t he F r ont Panel
Remo v e t he PWR- Co nt r o l
Remo v e t he Sc r ew and Pul l do w n t he L o c k ed po i nt
3-2
Samsung Electronics
Troubleshooting
Repair the frontal PCB-CRT or replace it after removing the attached connectors
PCB-CRT R
PCB-CRT G
PCB-CRT B
Samsung Electronics
3-3
Troubleshooting
3-1-3 Replacing a Burnt or Exhausted CRT
The Back Cover is detached as illustrated below (refer to the Opening Back Cover). Remove the screws indicated and detach the Top Cover
Remove the Dust Cover that prevents dust from entering into the screen
Before proceeding, disconnect all the DY and Connectors connected to the assembly. Remove the 4 corner screws from the CRT and replace the CRT
3-4
Samsung Electronics
Troubleshooting
3-2 Repairing No Sound
Confirm that CN601 is inserted
Abnormal
Abnormal
Check IC603 Output Terminal Pins 2 and 4
Normal
Insert the CN601 Connector
Check the Speakers
Check IC603 Input Terminal Pin 3
Abnormal
Check FD802S of the SUB Board
Normal
Check IC603 Input Terminal Pin 5
Abnormal
Check the Sound Mute Circuit
Normal
Check IC603 Input Terminal Pin 7 and 11
Abnormal
Normal
Check IC603
Check IC601 Input Terminals
Samsung Electronics
3-5
Troubleshooting
3-3 Repairing No Video (with Normal Sound)
Check the Heater Normal Check for High Voltage Normal Check CN501 Pins 1, 3, and 5 Abnormal
Normal Check IC501, 531, and 561
Check the CN501 Connector Normal Check IC04 Input Terminal Pins 20, 21 and 22 Abnormal
Abnormal Replace the CN501 Connector Normal Check IC04
3-6
Samsung Electronics
Troubleshooting
Check the Heater (Abnormal)
Replace R513, 543 and 573 Normal
Abnormal
Replace R513, 543 and 573
Check CB504 Pin 5 of the CRT-PCB
Abnormal
Check R464
Samsung Electronics
3-7
MEMO
3-8
Samsung Electronics