jetblue
Crossed Swords Squire
- Joined
- May 6, 2006
- Posts
- 185
hi,got a neo cd toploader that needed service last month. thought it was a simple laser issue as it would not boot games. discovered it would not show main menu but game did spin. Av was completely dead,blackscreen,blank,wouldn't display or audio. using my own neo cd i swapped parts and found the av/power board is where the culprit was. the laser and motherboard were fine.
did a cap change but it had no effect. checked all the caps with a cap meter and they were fine. With the help of thesteve,member here and on pcfx,we looked more closely at the cxa chip which provides av,i thought it was bad and was gonna do a transplant from my own neo cd to see if it works. he said to take volt readings and compare with my working one first. sure enough there was a discrepancy. L4 was a resistor that had 5.0v on both ends on a working unit,i got 5v on one end and 0 on the other in the faulty unit. thesteve said L4 is a choke or inductor and to bridge it. after bridging with a piece of wire the unit came back to life. here's a pic circled in red that needed bridging:
other side:
that's it,if you have black screen or no display look for other L series of chokes or inductors or whatever they are called and check them if any have died. do that first and don't bridge like crazy.
hope this helps revive any dead neocd's and many thanks to thesteve who stopped me from doing a chip change
heres my half assed volt readings of a working neo and the faulty one if anyone needs it,too hard to explain so il just leave it:
meter set to 200 v
power light to the left
working unit
power area
r12 0 both
r13 09.3 up 09.3 down
r14 0 right 07.8 left
r15 08.5 up 0 down
r16 05.0 both
r17 09.3 both
r18 04.2 up 0 down
r19 0 both
r20 0 both
r23 00.7 up 03.6 down
r51 09.2 up 09.2 down
r53 0 both
r54 07.8 right 09.3 left
r57 05.0 up 03.6 down
r58 08.5 up 09.2 down
c21 09.2 right 0 left
c22 0 up 05.0 down
c23 0 up 09.2 down
c24 05.0 right 0 left
c25 0 right 09.2 left
c26 0 both
q1 09.3 right 08.5 middle 09.3 left
q2 05.0 right 04.2 middle 05.0 left
q5 0 right 09.3 middle 0 left
q6 0 right 09.3 middle 0 left
q7 03.5 right 04.2 middle 04.4 left
q8 07.7 right 08.5 middle 08.5 left
d1 09.5 up 09.3 down
d2 05.3 up 05.0 down
d3 0 up 09.2 down
d4 05.0 right 09.1 left
d5 09.3 right 09.0 left
d6 0 up 05.5 down
d8 00.6 right 0 left
av area
r4 01.9 up 01.9 down
r5 01.9 up 01.9 down
r6 01.9/02.0 both
r7 01.4 right 01.4 left
r8 02.1 right 02.1 left
r9 01.6 up 01.6 down
r22 00.2 up 00.2 down
r25 00.2 up 0 down
r26 00.2 up 00.7 down
r27 00.2 up 0 down
r28 00.2 up 00.7 down
r29 00.2 up 0 down
r30 00.2 up 00.7 down
r31 04.6 right 04.6 left
r32 0 right 01.9/02.0 left
r33 0 right 01.9 left
r52 0 up 00.2 down
r55 05.0 right 05.0 left
ac8 + 01.6 - 01.4
ac10 + 01.9 -01.9
ac11 + 01.9 - 01.9
ac12 + 01.9/02.0 - 01.9
ac13 + 01.4 - 00.8
ac19 + 05.0 - 0
ac20 + 04.9 - 0
ac21 + 05.0 - 0
L4 05.0 right 05.0 left
L5 05.0 right 04.9 left
c5 02.1 up 00.2 down
c6 02.1 up 00.2 down
c7 02.1 up 00.2 down
c12 0 up 00.2 down
c14 0 right 05.0 left
c15 04.9 right 0 left
c16 0 up 05.0 down
c17 04.6 right 0 left
c18 01.9/02.0 up 0 down
c19 02.5 right 0 left
c20 01.7 up 0 down
cxa
1 0
2 02.1
3 02.1
4 02.1
5 0
6 0
7 05.0
8 03.6
9 02.5
10 04.6
11 0
12 04.9
13 01.9/02.0
14 03.9
15 02.1
16 01.6
17 01.7
18 01.9
19 05.0
20 01.4
21 01.9/02.0
22 01.9
23 01.9
24 0
flipped over now power light is to the right
audio area
r59 05.0 both ends
ac2 + 07.5 - 0
ac23 + 5.0 - 0
c2 02.5 up 0 down
c9 02.5 up 0 down
c10 0 up 02.5 down
c11 0 up 02.5 down
c13 05.0 up 0 down
d7 07.5 right 0 left
opamp1
1 02.4
2 02.4
3 02.4
4 07.5
5 02.5
6 02.5
7 02.5
8 02.5
9 02.5
10 02.5
11 0
12 02.5
13 02.5
14 02.5
Ic1
1 04.9
2 0
3 04.9
4 00.2
5 01.3
6 04.8
7 00.7
8 00.7
9 04.9
10 02.3
11 02.4
12 02.4
13 02.4
14 02.4
15 02.4
16 02.4
L20 08.2 both
r1 01.7 right 0 left
r2 0 right 0 left
r21 03.7 both
r24 0 both
r37 02.5 left 03.8 right
r38 03.8 both
r42 03.8 both
r44 03.8 right 08.2 left
r48 03.8 right 0 left
r47 03.8 both
r56 07.2 up 08.2 down
opamp2
1 05.8
2 00.4
3 00.4
4 07.2
5 03.8
6 03.7
7 03.8
8 03.7
9 03.7
10 03.7
11 0
12 03.7
13 03.8
14 03.8
ac1 + 07.2 - 0
ac22 + 05.0 - 0
c3 0 up 03.8 down
c4 03.8 right 0 left
c8 05.0 right 0 left
c27 0 both
r3 0 both
r10 0 right 03.8 left
r11 0 both
r34 0 both
r35 0 both
r36 03.8 both
r39 03.8 BOTH
r40 03.8 up 02.4 down
r41 03.8 up 0 down
r43 03.8 BOTH
r45 03.8 up 08.2 down
r46 03.8 BOTH
r49 03.8 right 0 left
r50 0 up 03.8 down
L1 05.0 BOTH
IC3
1 03.7
2 03.7
3 05.0
4 05.0
5 00.2
6 0
7 0
8 0
9 0
10 05.0
11 00.3
12 05.0
13 0
14 05.0
15 0
16 00.5
17 0
18 0
19 0
20 03.8
power regulators 3 prong
q3 switch on E 05.0 c 05.0 B 04.3 fluctuates between 4.2,4.3,4.4
switch off E 05.5 C 0 B 05.0
q4 switch on E 09.2 C 09.2 B 08.5
switch off E 09.4 C 0 B 08.7
Ic2 in 09.2 out 08.2
Ic5 in 09.2 out 05.0
Ic6 in 09.2 out 05.0
------------results--------------------
faulty neo cd
op amp 2
1 05.6
4 06.9
5 03.4
6 03.4
7 03.4
8 03.2
9 03.2
10 03.2
13 03.6
14 03.6
Ic1
5 01.1
Ic3
11 00.7
20 02.1
cxa Ic4
10 04.4
15 00.8
16 00.8
19 00.8
20 00.7
21 00.7
22 00.7
23 00.7
24 0
Ic2 out fluctuates between 07.9 and 08.0
Ic6 out 05.0
ac23 + 04.8
ac2 + 07.3/07.2
ac1 + 07.0
flipped board switch is on left
ac10 + 00.7
ac11 + 00.7 - 00.5
ac12 + 00.7 - 0
ac19 + 00.8 - 0
ac13 + 00.8 - fluctuates between 00.3 and 00.5
ac8 + 00.8 -this one kind fluctuates too from 00.6 to 00.8
L 4 is the culprit connected directly to pin 18 or 19 of the cxa
did a cap change but it had no effect. checked all the caps with a cap meter and they were fine. With the help of thesteve,member here and on pcfx,we looked more closely at the cxa chip which provides av,i thought it was bad and was gonna do a transplant from my own neo cd to see if it works. he said to take volt readings and compare with my working one first. sure enough there was a discrepancy. L4 was a resistor that had 5.0v on both ends on a working unit,i got 5v on one end and 0 on the other in the faulty unit. thesteve said L4 is a choke or inductor and to bridge it. after bridging with a piece of wire the unit came back to life. here's a pic circled in red that needed bridging:
other side:
that's it,if you have black screen or no display look for other L series of chokes or inductors or whatever they are called and check them if any have died. do that first and don't bridge like crazy.
hope this helps revive any dead neocd's and many thanks to thesteve who stopped me from doing a chip change
heres my half assed volt readings of a working neo and the faulty one if anyone needs it,too hard to explain so il just leave it:
meter set to 200 v
power light to the left
working unit
power area
r12 0 both
r13 09.3 up 09.3 down
r14 0 right 07.8 left
r15 08.5 up 0 down
r16 05.0 both
r17 09.3 both
r18 04.2 up 0 down
r19 0 both
r20 0 both
r23 00.7 up 03.6 down
r51 09.2 up 09.2 down
r53 0 both
r54 07.8 right 09.3 left
r57 05.0 up 03.6 down
r58 08.5 up 09.2 down
c21 09.2 right 0 left
c22 0 up 05.0 down
c23 0 up 09.2 down
c24 05.0 right 0 left
c25 0 right 09.2 left
c26 0 both
q1 09.3 right 08.5 middle 09.3 left
q2 05.0 right 04.2 middle 05.0 left
q5 0 right 09.3 middle 0 left
q6 0 right 09.3 middle 0 left
q7 03.5 right 04.2 middle 04.4 left
q8 07.7 right 08.5 middle 08.5 left
d1 09.5 up 09.3 down
d2 05.3 up 05.0 down
d3 0 up 09.2 down
d4 05.0 right 09.1 left
d5 09.3 right 09.0 left
d6 0 up 05.5 down
d8 00.6 right 0 left
av area
r4 01.9 up 01.9 down
r5 01.9 up 01.9 down
r6 01.9/02.0 both
r7 01.4 right 01.4 left
r8 02.1 right 02.1 left
r9 01.6 up 01.6 down
r22 00.2 up 00.2 down
r25 00.2 up 0 down
r26 00.2 up 00.7 down
r27 00.2 up 0 down
r28 00.2 up 00.7 down
r29 00.2 up 0 down
r30 00.2 up 00.7 down
r31 04.6 right 04.6 left
r32 0 right 01.9/02.0 left
r33 0 right 01.9 left
r52 0 up 00.2 down
r55 05.0 right 05.0 left
ac8 + 01.6 - 01.4
ac10 + 01.9 -01.9
ac11 + 01.9 - 01.9
ac12 + 01.9/02.0 - 01.9
ac13 + 01.4 - 00.8
ac19 + 05.0 - 0
ac20 + 04.9 - 0
ac21 + 05.0 - 0
L4 05.0 right 05.0 left
L5 05.0 right 04.9 left
c5 02.1 up 00.2 down
c6 02.1 up 00.2 down
c7 02.1 up 00.2 down
c12 0 up 00.2 down
c14 0 right 05.0 left
c15 04.9 right 0 left
c16 0 up 05.0 down
c17 04.6 right 0 left
c18 01.9/02.0 up 0 down
c19 02.5 right 0 left
c20 01.7 up 0 down
cxa
1 0
2 02.1
3 02.1
4 02.1
5 0
6 0
7 05.0
8 03.6
9 02.5
10 04.6
11 0
12 04.9
13 01.9/02.0
14 03.9
15 02.1
16 01.6
17 01.7
18 01.9
19 05.0
20 01.4
21 01.9/02.0
22 01.9
23 01.9
24 0
flipped over now power light is to the right
audio area
r59 05.0 both ends
ac2 + 07.5 - 0
ac23 + 5.0 - 0
c2 02.5 up 0 down
c9 02.5 up 0 down
c10 0 up 02.5 down
c11 0 up 02.5 down
c13 05.0 up 0 down
d7 07.5 right 0 left
opamp1
1 02.4
2 02.4
3 02.4
4 07.5
5 02.5
6 02.5
7 02.5
8 02.5
9 02.5
10 02.5
11 0
12 02.5
13 02.5
14 02.5
Ic1
1 04.9
2 0
3 04.9
4 00.2
5 01.3
6 04.8
7 00.7
8 00.7
9 04.9
10 02.3
11 02.4
12 02.4
13 02.4
14 02.4
15 02.4
16 02.4
L20 08.2 both
r1 01.7 right 0 left
r2 0 right 0 left
r21 03.7 both
r24 0 both
r37 02.5 left 03.8 right
r38 03.8 both
r42 03.8 both
r44 03.8 right 08.2 left
r48 03.8 right 0 left
r47 03.8 both
r56 07.2 up 08.2 down
opamp2
1 05.8
2 00.4
3 00.4
4 07.2
5 03.8
6 03.7
7 03.8
8 03.7
9 03.7
10 03.7
11 0
12 03.7
13 03.8
14 03.8
ac1 + 07.2 - 0
ac22 + 05.0 - 0
c3 0 up 03.8 down
c4 03.8 right 0 left
c8 05.0 right 0 left
c27 0 both
r3 0 both
r10 0 right 03.8 left
r11 0 both
r34 0 both
r35 0 both
r36 03.8 both
r39 03.8 BOTH
r40 03.8 up 02.4 down
r41 03.8 up 0 down
r43 03.8 BOTH
r45 03.8 up 08.2 down
r46 03.8 BOTH
r49 03.8 right 0 left
r50 0 up 03.8 down
L1 05.0 BOTH
IC3
1 03.7
2 03.7
3 05.0
4 05.0
5 00.2
6 0
7 0
8 0
9 0
10 05.0
11 00.3
12 05.0
13 0
14 05.0
15 0
16 00.5
17 0
18 0
19 0
20 03.8
power regulators 3 prong
q3 switch on E 05.0 c 05.0 B 04.3 fluctuates between 4.2,4.3,4.4
switch off E 05.5 C 0 B 05.0
q4 switch on E 09.2 C 09.2 B 08.5
switch off E 09.4 C 0 B 08.7
Ic2 in 09.2 out 08.2
Ic5 in 09.2 out 05.0
Ic6 in 09.2 out 05.0
------------results--------------------
faulty neo cd
op amp 2
1 05.6
4 06.9
5 03.4
6 03.4
7 03.4
8 03.2
9 03.2
10 03.2
13 03.6
14 03.6
Ic1
5 01.1
Ic3
11 00.7
20 02.1
cxa Ic4
10 04.4
15 00.8
16 00.8
19 00.8
20 00.7
21 00.7
22 00.7
23 00.7
24 0
Ic2 out fluctuates between 07.9 and 08.0
Ic6 out 05.0
ac23 + 04.8
ac2 + 07.3/07.2
ac1 + 07.0
flipped board switch is on left
ac10 + 00.7
ac11 + 00.7 - 00.5
ac12 + 00.7 - 0
ac19 + 00.8 - 0
ac13 + 00.8 - fluctuates between 00.3 and 00.5
ac8 + 00.8 -this one kind fluctuates too from 00.6 to 00.8
L 4 is the culprit connected directly to pin 18 or 19 of the cxa
Last edited: