Hi Guys,
Samsung PS42A410.
Fault:
12 green vertical bars evenly spaced across screen (photo)
Measurements Taken.
The pins on the sockets weren't numbered, so I used the pins with the black cables as pin 1, and then considered each socket to have pin 1 at the same place. (Photo)
CN801.
1. pson 0v 2. n.c 0v
3. std5v 5.2v 4. rtn 0v
5. rtn 0v 6. rtn 0v
7. 13v 12.7v 8. bv_amp 12.7
9. rtn 0v 10. rtn 0v
11. rtn 0v 12. rtn 0v
13. d5.3 5.2v 14. d5.3 5.2v
15. d5.3 5.2v 16. d5.3 5.2v
17. rtn 0v 18. rtn 0v
19. 13v 12.7v 20. rtn 0v
21. 13v 12.7v 22. d13v 12.7
23. n.c 0v 24. n.c 0v.
CN807
1. 5.3 5.2v
2. 5.3 5.2v
3.&4. rtn 0v
5.&6. n.c 0v
7. pson 0v
8. n.c 0v
9. vson 0v
10. std5v n.c 0v
CN810.
1.&2. vs 207v (was 205v/ adjusted up)
3. rtn 0v
4. va 54v (was 53v/ adjusted up)
5. rtn 0v
6. vg 14.7v
Notes
1. I saw the adjustment for the vscan but couldn't find measurement points.
2. The 5.3v fluctuates between 4.7v & 5.1v at about 1 cycle a second which seems to correspond to the green led flashing on the logic board.
Repair attempt.
After stripping the set down I noticed the 12 green bars lined up with the 12 ribbon cables that connect the buffer to the panel and reckoned that all 12 ribbon cables or their sockets couldn't all be identically faulty.
In my mind it had to be something common to all 12 sockets.
So I changed the caps that look responsible for "smoothing" the VA voltage to the buffer board. No luck. (photo)
I used my esr meter to check the cap on the power supply also responsible as a smoother/resivoir cap on the VA line. looked good.
I also need to point out the purple & yellow lines marked with arrows in the second photo.
I dont know where to go from here. Could somebody please help.
Samsung PS42A410.
Fault:
12 green vertical bars evenly spaced across screen (photo)
Measurements Taken.
The pins on the sockets weren't numbered, so I used the pins with the black cables as pin 1, and then considered each socket to have pin 1 at the same place. (Photo)
CN801.
1. pson 0v 2. n.c 0v
3. std5v 5.2v 4. rtn 0v
5. rtn 0v 6. rtn 0v
7. 13v 12.7v 8. bv_amp 12.7
9. rtn 0v 10. rtn 0v
11. rtn 0v 12. rtn 0v
13. d5.3 5.2v 14. d5.3 5.2v
15. d5.3 5.2v 16. d5.3 5.2v
17. rtn 0v 18. rtn 0v
19. 13v 12.7v 20. rtn 0v
21. 13v 12.7v 22. d13v 12.7
23. n.c 0v 24. n.c 0v.
CN807
1. 5.3 5.2v
2. 5.3 5.2v
3.&4. rtn 0v
5.&6. n.c 0v
7. pson 0v
8. n.c 0v
9. vson 0v
10. std5v n.c 0v
CN810.
1.&2. vs 207v (was 205v/ adjusted up)
3. rtn 0v
4. va 54v (was 53v/ adjusted up)
5. rtn 0v
6. vg 14.7v
Notes
1. I saw the adjustment for the vscan but couldn't find measurement points.
2. The 5.3v fluctuates between 4.7v & 5.1v at about 1 cycle a second which seems to correspond to the green led flashing on the logic board.
Repair attempt.
After stripping the set down I noticed the 12 green bars lined up with the 12 ribbon cables that connect the buffer to the panel and reckoned that all 12 ribbon cables or their sockets couldn't all be identically faulty.
In my mind it had to be something common to all 12 sockets.
So I changed the caps that look responsible for "smoothing" the VA voltage to the buffer board. No luck. (photo)
I used my esr meter to check the cap on the power supply also responsible as a smoother/resivoir cap on the VA line. looked good.
I also need to point out the purple & yellow lines marked with arrows in the second photo.
I dont know where to go from here. Could somebody please help.
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