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IIgs Screen


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#1 bibilit

bibilit
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  • LocationParis area -FRANCE-

Posted 20 March 2017 - 07:14 AM

trying to repair a IIgs screen, image is as picture... not seen anything obvious.

 

IMG_0884.JPG

 

Any idea ?


Macintosh Classic and II ,CC, SE, SE/30,IIsi 25mhz(RasterOps video),Q 700,LC, LC III,LC475, PBook Wallstreet/Bronze/5300cs/1400c/100/Tibook Imac G3 slot-in, Bondi and G4 / PMac G4 sawtooth, QS, MDD, Yikes!, Cube, Imac Core 2 Duo, Ibook G3 (white/clam) G4 + Newton 120, eMate 300,Quicktake 150,  PowerCD


#2 techknight

techknight
  • 68LC040

Posted 20 March 2017 - 09:38 PM

Yep, capacitors associated with the vertical output IC, and the possibility of it being the vertical output IC itself. 

 

Also the flyback is known for seriously bad solder joints and if your missing one of the B+ scan supply rails, it can cause this as well. 

 

A strong smack in the side while on will wraggle that one out. 


Edited by techknight, 20 March 2017 - 09:38 PM.

Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
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#3 Johnnya101

Johnnya101
  • 6502
  • LocationLancaster, NH

Posted 21 March 2017 - 12:25 AM

Yup, re solder those joints and GET NEW CAPS! They are all only rated to 85c and are all exposed to high temperatures all the time. Those monitors get hot fast...

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#4 bibilit

bibilit
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  • LocationParis area -FRANCE-

Posted 22 March 2017 - 07:32 AM

Joints have been reworked, tried to hit while on, no better.


Edited by bibilit, 22 March 2017 - 07:33 AM.

Macintosh Classic and II ,CC, SE, SE/30,IIsi 25mhz(RasterOps video),Q 700,LC, LC III,LC475, PBook Wallstreet/Bronze/5300cs/1400c/100/Tibook Imac G3 slot-in, Bondi and G4 / PMac G4 sawtooth, QS, MDD, Yikes!, Cube, Imac Core 2 Duo, Ibook G3 (white/clam) G4 + Newton 120, eMate 300,Quicktake 150,  PowerCD


#5 Johnnya101

Johnnya101
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  • LocationLancaster, NH

Posted 22 March 2017 - 11:26 AM

I really think it's caps since you've got a partial vertical collapse and can see some of the no startup disk screen (Or something?).

On my other thread here there's a cap kit console5 is selling for $15. You get all new name brand caps, along with a peice of candy! Lol.

Edited by Johnnya101, 22 March 2017 - 11:27 AM.

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Looking for a QUADRA 700, 950, or IIfx! Collection: Apple IIGS, Classic II, SE/30, Color Classic, Plus 1MB, Imagewriter II


#6 techknight

techknight
  • 68LC040

Posted 22 March 2017 - 11:16 PM

Then you likely have a failed vertical output IC. 

 

A capacitor CAN cause this, but usually from my experience working on old tube type TVs is when the caps fail in the vertical output stage, it takes the IC with it. 


Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225




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