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probable C33 and C36 these will be cracked after all the years of service and create a shortcut.
you can remove the capacitors, you can test the mac without them,
Thanks for your reaction,
The L3 is a coil so reversing it should have no effect, I thought also. It does have a little effect as you can see the left margin of the screen got bigger.
Addes a new photo with some lines. The difference between the left and right side of the screen is >10%, it...
R1 and L3 are the components responsable for the horizontal linearity.
Measured R1, 220 ohm seems ok, L3 also ok.
Noticed L3 has been reversed on the board (the glue was on the R1 side) by someone previously repairing the board?
After reversing L3 back the image improved somewhat
C1 is replaced with a film cap 3.9uf 450vdc Ecw-fd2w395jb
problem is the same before and after replacing C1
on this international analog board i have replaced CR15 and CR17 (zener 6v2) and R55 (33k)
Have a mac plus here with a problem.
The right side of the screen seems to be compressed. Everything on the right side is a lot smaller.
Does anyone know how to fix this?
Already replaced C1
Maybe the following can help to understand the circuit better, is part of the powersupply schematic
does anyone have the schematics for the international version of the analog board?
The challenge you have is not the caps but the repair of the traces, the board will not work until you repair these.
there are a number of traces which have the capacitor island in the middle so the connection is broken.
Also for example the trace which runs between the islands of C5 and...
tried some other resistors,
1K5 is too much (unstable),
1K , voltages too high.
1K1 and 1K2 work
this is using a BRX49, don't have other BRX4x to test.
You have to regulate the 5V to get as close as possible to the desired 5V value, too high or too low => crowbar.. :unsure:
Still...
I don't think you "need" any of the caps to boot.
The most important thing is to clean the board to remove alle the leaked cap fluid.
c15 connects to the pins as shown in the picture
Thanks for your replies.
Put a 10K potmeter in place of R50, the mac is stable at 1K, so I replaced R50 with a 1K resistor.
Problem is I have very little regulation on RPx to adjust the 5V, voltages are 5.2V and 12.35V
Mac is working ok but don't know if this is the best solution.
Am also looking for a replacement for the E0122YA
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1 2 3
E0122YA (K G A)
tested the foillowing replacements:
BT169D (K G A) flupping set
P0102DA (K G A) flupping set
BRX49 (A G K)reverse! mac starts but is not...
does pin 4 connect to to pin 26 UI4 ?
could you complete the following list so all pins are checked (don't have a schematic myself)
UH6
pin 1,13,14 to pin 17 UI4 BBU
pin 2 to pin 9 UL1
pin 3 to pin 15 UF3
pin 4 to pin 26 UI4
pin 5 to pin 3 UL1
pin 6 to
pin 7 to pin 4 UL1
pin 9 to pin...
Hello Macalle,
you have to check the connections from the pins of UH6 all the way to the CAS PAL UL1
and also to VLSI UI4
The must be a broken connection there
In my case the connection was broken from UH6 to the via, but in your case may be somewhere else on the line.
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