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HELP WITH Macintosh SE/30 Horizontal Line

ROLLERMANZ

ROLLERMANZ

6502
Hello guys, 

I have a Macintosh SE/30 which I have bought off somebody. I have thoroughly cleaned the macintosh analog and logic board. when I say thoroughly cleaned meaning, I have recapped it, removed all the corrosion from all the chips and bits and also re soldered all the joints on the analog and the logic board. Re soldered all the joints on the yoke connector aswell.

I have also tested the analog board with a second macintosh se logic board and the analog board works perfectly fine. When I put the analog board back into the first macintosh and turn it on, the macintosh turns on and the normal bong can be heard however there is a bright horizontal line in the middle of the screen. 

I have read all the forums claiming that its an analog board for sure but like I've said I've already tested the analog board with a different logic board and it works perfectly fine so its definitely the logic board which has the problem. 

i have tried the logic board with a different set of ram chips but still to no avail. I have also read the famous (The dead Mac Scrolls) book but it doesn't have any such topic like this. So as a last option I decided to seek help from here.

Macintosh SE/30 

-Analog board been cleaned thoroughly

-logic board been cleaned properly and blown with a compressor

-All the capacitors been replaced with new ones

-Corrosion been removed from everywhere

-All the components solder been refreshed on the analog and logic board

-Hard drive works perfectly fine

-Bong can be heard

                     JUST A BRIGHT HORIZONTAL LINE SHOWN IN THE MIDDLE OF THE SCREEN 

SEE IMAGES ATTACHED TO THIS POST PLEASE

Awaiting Help

Thank you very much

RollermanZ

Photo 27-09-2014 17 28 02.jpg

Photo 27-09-2014 17 29 14.jpg

Photo 27-09-2014 17 29 34.jpg

 
Dead Mac Scrolls has pages 164 & 165, a cracked solder joint on connector P1 on the Analog Board (p164) and IC Chip on the Analog Board: TDA-1170 ( p165). But you stated that the analog board works fine on another Mac and you tested another logic board on this Mac.

The only 2 possible problems couple be simple and cheap or simple and expensive.

- Simple and Cheap: inspect the yoke connector itself, grab each wire and tug on it. If a wire pop's off, then that's the problem. You can remove the pin and solder the wire to the end of it. Check the other wires on the connector and sold them if they break. Also check the wiring connection on the yoke itself and solder any broken wires there.

- Simple and Expensive: Your yoke is burnt out. You need to check this with a multimeter and each pair should have a reading. But finding the dead coil does not mean you can fix it, you have to replace the whole yoke.

Email Herb and see if he has a spare yoke assembly. http://www.retrotechnology.com/herbs_stuff/mailto.html

- Simple & Expensive II: If fixing or replacing the yoke does not fix it, the deflection plate in the CRT is blown, you will need a new CRT. Email Herb is he has any more CRTs.

I do not know Herb or collect $$$ from him. I just found him on the 'net.

 
Okay I have an other working CRT , so how about if just change the CRT and see if that works.. Would this be easier then checking the yoke connector and all.. I can fix this faulty yoke crt afterwards.. Shell i go ahead and do this now to see if its just the CRT ?

 
That maxell battery, I would get that out of there. Also, Those Capacitors on there, if at all possible, maybe try to get them to lay on their sides. That way you will not risk bumping one and popping it right off the board with pad and trace and all.  That line looks really bright.  I am doubting there is anything wrong with the PSU / CRT or Analog board.  I know UE8 is a big problem with the SE/30's ( on the mainboard )

 
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Yup, and just one more thing. You really should change the 220uf and 470uf Capacitors.  470uf cap is known to leak, and its got quite alot in it.

 
I just tried the analog and the logic board with a different CRT and still is the samething.. However I've noticed something else .. I have another macintosh se which ive just turned on and i hear the normal Bong sound but when i turned this faulty macintosh se on, it made a different bong sound.. It just didnt sound the normal one .. I am not sure how to explain what it sounded like but it just wasnt the bong that you would normal hear from the macintosh plus, se or the classic ii.. Its sounding a different bong.. Any help with this?

 
Get yourself some magnifying glasses and put them on, search the board for a short or broken trace. UE8 is a "Usual Suspect" on Video Logic Board Problems. But also, there is a lot of Flux on the board from your soldering. Get a bottle of Acetone and strong Isopropyl Alcohol, and wipe that board down with paper towels and q-tips soaked in Acetone, and then rinse it off with the alcohol and let dry. That will clear up the flux off the board and let you inspect the work done on it.

 
fixing this easily will need access to an oscilloscope. 

Probe the vertical drive out from the mainboard, and see if it is present. If not, you wont have vertical sweep. 

If you do have a drive signal, then you need to check the TDA1170. The datasheet is available. 

Check for the present drive signal at the TDA1170. if its not present, then you can look at the connectors between logic to analog, and the inverter gate on the analog. 

IF it is present, check the TDA1170 for voltage and cracked solder. if its ok, then replace the TDA1170. 

I have seen alot of vertical output ICs blow in TVs, but personally have never seen a bad one in a compact mac. But theres always a first. But I tend to think the problem lies elsewhere. 

 
I thought I pointed that out! - LOL!

But thing it according to RollerManz, the analog board works fine with another logic board. So its a logic board failure. But inspecting his work on his pics, the board needs to be cleaned up - too much flux everywhere from what I can see. When he cleans the board, then he can look for a shorted or broken trace around UE8 and other suspected areas.

 
Bad news, i just used a heat gun to remove the UE8 chip and as i removed it off the board, some of the traces and pads came off too aghh :( .. What to do now ? These broken prints r really annoying..

 
seeing that the traces and the pads have come of this motherboard so it is rather more hard to fix this.. as matter of fact i also have another macintosh se/30 logic board which has had a battery acid spilt over.. however when i turn the macintosh on which this logic board, it shows a checker flag pattern and also on the logic board, the d1 and d2 has come off.. would it be easier to fix this motherboard then fixing the first one guys ? .. if its easier to fix this motherboard then i would just take off the battery holder, d1 and d2 from the first board and put it on this.. ?

 
The logic board which has had a battery acid split over, shows this screen along with a dead mac sound at the start up.. any suggestions? would this logic board be easier to fix then the other one

Photo 28-09-2014 12 30 25.jpg

 
Don't take this as an insult, but its time to send both boards out to repair. Both Uniserver and TechKnight can get them to work, you do not have the equipment (an oscilloscope ) or expertise to fix these boards yourself. PM or email Uniserver here in the forum  and see what he tells you. Then decide what is your next step as you get your $$ together.

 
Not that I know of. But members like CloakedAlien who lives in Sweden (I believe) and others throughout Europe have had Uniserver repair his SE/30 board for them. Though I live in the USA, I understand that there is high shipping cost and long shipping times to deal with when shipping to/from the Europe and the USA. I believe it took less than 4 weeks for CloakedAlien to get his board back in working order. 3 - 4 of those days were actually used in repairing the board.

Talk to Uniserver. He'll let you know what the details with shipping are and help with the arrangements (how to pack and what expected costs are). But I say, if you do this, send both boards so when they come back you will have 2 working SE/30 boards now and not just one now and maybe one sometimes later on in the future. It also saves on shipping costs to send both at the same time in 1 package than it is to send each one in separate packages in different times.

Many members here trust Uniserver and Techknight for their work on bringing dead macs back to life.

 
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