gdrom board out of order :(

[somacast]

hello,

during my early attempts to do the mod I had sone wiring errors so I had to solder & desolder maaaaaany times, so I ended up with a gdrom not working when i fix it, i tried cleaning etc didnt help, it behaves as if no gdrom is attached (black screen then still dreamcast logo).

story goes on, as i by mistake removed (R233), i just tried to fix it without magnifier lens so i fixed it wrong in short circuit, so when i tried the board smoke smell came quickly and i did not try it again,

is this repairable? i dont have the R233 it was broken,, so where to start, because like this my stock dreamcast is not working



photo is here. https://www.dropbox.com/s/wvwpj29chna6am...6.jpg?dl=0

[somacast]

any clue hint would be really helpful , thnx n advance

[aykiri1]

(16.12.2016 21:49)somacast писал(а):  hello,

during my early attempts to do the mod I had sone wiring errors so I had to solder & desolder maaaaaany times, so I ended up with a gdrom not working when i fix it, i tried cleaning etc didnt help, it behaves as if no gdrom is attached (black screen then still dreamcast logo).

story goes on, as i by mistake removed (R233), i just tried to fix it without magnifier lens so i fixed it wrong in short circuit, so when i tried the board smoke smell came quickly and i did not try it again,

is this repairable? i dont have the R233 it was broken,, so where to start, because like this my stock dreamcast is not working



photo is here. https://www.dropbox.com/s/wvwpj29chna6am...6.jpg?dl=0

100Kohm resistor. you can use smd or non smd too

[somacast]

thnx a lot , next what to do after restoring the Resistor??

[somacast]

update : soldered a non smd 100 kohms to the board, dreamcast behaves as if no gdrom installed, when i depress the cover button laser unit does not respond, motor not moving and no laser... what to check plz?

[somacast]

I searched for fuse components but could not find, could it be a cap is gone ??

[aykiri1]

(17.12.2016 21:18)somacast писал(а):  I searched for fuse components but could not find, could it be a cap is gone ??

usually caps gone by long time working,hot,short-circuit and i think your caps are alive

[somacast]

(18.12.2016 18:08)aykiri1 писал(а):  

(17.12.2016 21:18)somacast писал(а):  I searched for fuse components but could not find, could it be a cap is gone ??

usually caps gone by long time working,hot,short-circuit and i think your caps are alive

thnx again , but as I said there was a smoke smell when I restored the shorted resistor ... so could it be one of the caps gone like that ? visually I don't see anything unsuall but it still not working..

[aykiri1]

(19.12.2016 21:32)somacast писал(а):  

(18.12.2016 18:08)aykiri1 писал(а):  

(17.12.2016 21:18)somacast писал(а):  I searched for fuse components but could not find, could it be a cap is gone ??

usually caps gone by long time working,hot,short-circuit and i think your caps are alive

thnx again , but as I said there was a smoke smell when I restored the shorted resistor ... so could it be one of the caps gone like that ? visually I don't see anything unsuall but it still not working..

can you take a hi-res photo ?

[Gillbert]

(19.12.2016 21:32)somacast писал(а):  [quote='aykiri1' pid='33519' dateline='1482070086']
[quote='somacast' pid='33508' dateline='1481995091']
I searched for fuse components but could not find, could it be a cap is gone ??


there was a smoke smell when I restored the shorted resistor ... so could it be one of the caps gone like that ? visually I don't see anything unsuall but it still not working..

It's hard to tell something about it, can be a lot of things. But from your description it seems that you shorted the +3volts line with another one. R233 is responsible for RESET line.
Was the GD-ROM board damaged only? Is the mainboard still working?
In such situations, it's pretty rare a capacitor failure, it's most like a fuse, resistor or a semiconductor (transistor, IC). Yes, some hi-res pics from both sides of GD-ROM PCB should be welcome.

[somacast]

really big thnx for replying.

Yes the main board is still working, I even moved the mod to it after I lost the GD-ROM board.

https://www.dropbox.com/sh/dsy5e9ctsvca1...a6eca?dl=0

the photos as requested,

[Gillbert]

(21.12.2016 21:59)somacast писал(а):  https://www.dropbox.com/sh/dsy5e9ctsvca1...a6eca?dl=0

the photos as requested,

Please, if you have a magnifier, check IC4 (TC9450) where I marked in red, is it a cracked?

[somacast]

thnx alot, i will once i get back home.

[somacast]

ok checked it, does not seem like blown or broken seems like just a scratch or so, any other hints plz?

[somacast]

any other useful information? i dont want to replace the entire drive for this


thnx