Error code 0082 from Macintosh Portable 5120

[BEU]

[SIZE=medium]This portable did work some months ago. The harddrive was dead but it was working fine with the floppy drive. Recently when I tested it it was not working, Sad Mac and error code 00000014  0000CD36. [/SIZE]

[SIZE=medium]Started to recap it. A lot of dirt under the capacitors. Especialy C25-C28 was very dirty.  Cleaned with etanol and aceton. I replaced the small ones with Tantalum and also replaced the radial and axial capacitors with new electrolytic capacitors.  By mistake I lifted a pad ( + at C26) but managed to put the new tantalum in place. [/SIZE][SIZE=medium]No I get a Sad Mac with error code 00000082,  00000101. The sound is good.[/SIZE]

[SIZE=medium][/SIZE]

[SIZE=medium]I have inspected the board several times and cleaned more but no help. Checked the continuity from all capacitors to the traces. I have read several threads on this  forum and [/SIZE][SIZE=medium]www.thinkclassic.org[/SIZE][SIZE=medium]  about the Portable, especially techknights extremely fine description about restoring the portable. [/SIZE]

[SIZE=medium]I have read that the error code ….CD36 is about the power manager? Have not found any information about ….0082.[/SIZE]

[SIZE=medium]I have to admit that I have done a stupid thing. Previous I have run the portable with a external PSU delivering 7.5 volt connected to the battery box.  Do you think that has destroyed the portable?? [/SIZE]

[SIZE=medium]Now I´m running it with a small 9 v battery  and an AGM 6 volt battery in the box.[/SIZE]

[SIZE=medium]As soon as I turn it on I hear the sad Mac and get the error code ….0082[/SIZE]

[SIZE=medium]The C26 has connextion to the hybrid board and C25, should it be connected to any other place?? Some solder on the hybrid board are dark but the continuity are OK.[/SIZE]

[SIZE=medium]If possible I need some help to where to continue to find the problem.  Maybe the RAM near C4-C5?[/SIZE]

[SIZE=medium]I have attached only the keyboard and screen.[/SIZE]

[SIZE=medium]Greatful for any help.[/SIZE]

 

[Macdrone]

you can have surely cooked something with 7.5 running the machine as it was made for 6 volts.  Not sure as usually hurting it was a newer powerbook supply plugged into the charging port burning it up.

Have you tried the interupt then the button next to it?

 

[techknight]

that is a RAM code. Inspect RAM pins. 

$CD34/$CD36 is VIA to PMU bus nexus broken. if it went away, chances are it was cap goo. 

 

[BEU]

Thank You Macdrone and techknight for advice.

When I press reset and NMI button it turns off. When I start from KB its the same result.

New symtoms, dont know if its good or bad.

Today I cleaned the board more . Lots of alcohol and toothbrush on all RAMs  , on new tantalums and PMGR chip. Cleaned under the hybrid board .  Resoldered C116, C14 and Q18. All RAMs looks OK except for the one nearest C4-C5, solder little darker..  I resoldered that RAM.

restarting now gives the sad Mac and this error code.



When I press NMI this picture.



The voltage on the two red wires is 8.4 V when only 9V battery installed. Same when AGM battery in box without pressing the switch in battery box. When switch is pressed: 6.2 V

The battery does not charge when I connect 7.5 to charging connector.

Read techknight detailed thread :  https://68kmla.org/forums/index.php?/topic/22080-mr-sherlock-techknight™-51205126-mac-portable-common-issu/page-3

Is it the hybrid board thats not working ?? Where to start??

 

[techknight]

CD code is bad trace between VIA and PMU. 

 

[BEU]

I have checked the traces between VIA and PMGR, the numbers on PMGR refers to pin on VIA.

Dont know if I have used the correct pin numbers.

se Picture.



Also Connection to hybrid board.



next step is maybee to measure on a healthy board.

 

[BEU]

I have now measured the connections between PMGR, VIA and hybrid board on a working portable 5120. This 5120 is working and charging the battery.

I have found the same connection on both the working and not working board. Checked two times. Se Pictures.



  

I suppose that means that there is a defect in the PMGR or hybrid board.

Anybody know where to continue ? Is there any way to test the hybrid board??

 

[techknight]

if the Hybrid is bad, its pretty much game over. Those things are almost impossible to fix. 

The only thing that works for me is hitting all the solder joints with chipquik SMD 291 flux, and then reflowing the whole hybrid with a heatgun. all the solder joints will melt and refresh, and all the cap-goo will ball up into black spots inside the flux which you can clean off. 

That usually fixes sketchy hybrids. 

 

[BEU]

Thanks techknight for Your answer. I will try to reflux as You suggested.

How about the IC LTC1040CN , LT1054CN8 and OP20H? Can that be the problem? 



They are cheap to buy and can be replaced.

 

[aplmak]

Those tantalum caps look fishy to me.... I use size "C's" because I could never find size B's for that 47uf 16v. I think it's 47uf 16v... You didn't order those from China did you??? They are quality tantalums right?? This may be a longshot because Techknight is like the 5120 king... (Side Note: He's going to gripe at me from this post because I owe him a backlight kit.... lol!!! And I haven't been in touch..) I use mostly the KEMET 47UF 16V size c's.... I know Uni likes ceramic..

The one's from China are like re-labeled tantalums... or not the correct value's I've found out... they say so printed on them but they are fake..

Just my 2 cents...

 

[BEU]

Aplmak You have solved the problem !! PERFECT.

I have measured the capacitance on these new tantalums and one of them is defect. They are marked as 47 uF 16V but one of them (C17) is only 34 uF. Se picture.



Exactly as You suspected I have bought these from Hong Kong (Ebay).  I have earlier used Kemet tantalums on macintosh  boards but these are smaller and easier to solder in place.
These small tantalums , size B has the following specification:

------------------------------------
Product Name Chip Tantalum Capacitor
Rated Voltage 16V
Capacity 47uF
Type 3528 B Model
Each Size(Approx.) 4 x 3 x 2mm/ 0.16" x 0.12" x 0.08"(L*W*T)
External Material Tantalum, Metal
Weight 5g
Package Content 50 Pcs(±2%) x 3528 Chip Tantalum Capacitor
Descriptions:
• Great for various digital products and DIY projects.
• Small units with high stable performance,lower current leakage and dissipation factor, stable frequency and temperature and long life. suitable for military equipment and computer, telephone and other electronic products.

Manufacturer Part Number Does not apply
Brand Unbranded/Generic
MPN Does not apply
UPC 702105334911

-------------------------------------------------

Good to know that these tantalums are crap. Do not buy them.

I replaced all capacitors on this board to Kemet size C , the error code  00000014  0000CD36 is gone but instead I’m back to error code 00000082  00000101.  That’s obviously is a RAM error.
I will check all RAMs but I’m not sure which one is defect.

Obviously very important to use high quality components.
Thanks again aplmak for Your excellent help.

 

[BEU]

This portable now show the error code 00000082  00000101.

that is a RAM code. Inspect RAM pins. 

$CD34/$CD36 is VIA to PMU bus nexus broken. if it went away, chances are it was cap goo. 

I have inspected RAM pins but not found any obvious damage. Resoldered some pins but no help. I have got some new RAM chips and will try a last effort to save it by replacing the RAM chips.

Does the error code give any information were to start replacing RAM chips?

Shall I begin near C4 C5 or near the hybrid board?



I got 16 new RAM chips so I cant replace all 32.

Greatful for any advice.

 

[techknight]

Umm, those caps in that picture look ORIGINAL. Is this an older pic? 

 

[BEU]

Umm, those caps in that picture look ORIGINAL. Is this an older pic? 

Yes. this is an old picture. Its now recapped with Kemet size C tantalums. I replaced all the size B tantalums with Kemet size C.

 

[BEU]

The board looks like this for the moment.



Any suggestions if I should try and replace RAMs from rows A, B, C etc or from 1, 2, 3 ,4?

 

[techknight]

I see some issues with the RAM sitting below the 26LS32. looks bridged? 

 

[BEU]

I see some issues with the RAM sitting below the 26LS32. looks bridged? 

Thank You techknight for Your interest in this poor portable. In fact it was a poor picture with some dust on the board.

After cleaning its looks like this today



Previously I have resoldered that RAM, as the soldering did not looked perfect before. The Connections are OK now and no bridges  between the pins.

Maybe I will start replacing RAMs on row A-B as they are closest to C4- C5.

 

[techknight]

I have learned there is really no easy way to know which RAM is bad. I just pull them all, and replace them one by one with new ones. 

the only option I have come up with is literally grabbing a board that is known good, and swap a RAM IC or two with others until I find the bad ones. Take the bad ones and toss em. 

 

[aplmak]

I'd suggest a good cleaning with 90% alcohol in the bath tub... use the bottle with the little squirting hole.. I then rinse it down.. and with a toothbrush scrub all the IC connections.. real good.. make sure all the gunk is gone! I then turn it over and do the other side... Also take note of the flip side of the board and inspect the areas where the old caps were positioned.. sometimes it leaks through the through holes.. I do actually have a huge mess of 128K chips that go on this board.. Techknight and I have been working on getting PDS Ram cards put together.. So since I've got so many I can send you some.. I bought 128k's and I should have gotten 512k's... I had a bad small trace on one board just above the large axial cap next to the keyboard connector.. check that one.. it is a small trace..