Dreamcast video issue, need help identifying part ZD401

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User avatar
Heavium_k
shadow
Posts: 11

Dreamcast video issue, need help identifying part ZD401

Post#1 » Sun Aug 11, 2019 10:31 pm

Hello all, i just registered because i'm at a loss trying to find a spare part to fix a faulty dreamcast i bought off ebay.
I already managed to fix the drive that wouldn't read.

The remaining issue is a part on the back of the motherboard that's been damaged.
Because of this, in the RGB, i only get Blue, a bit of red ..somehow, as the tint is more purple than blue.

I looked up some things, found some help, but now....to dive in and repair it/replace it...i have no idea what part i should be looking for.
Maybe i could wire the lost connections to R and B (pun intended) but the ZD401 looks damaged.

I would be beyond happy if people here, who know these things way better than me, could help me fix this dreamycast. :)

Another bit of info :

it's for sure something, probably this thing, on the board and not cables or my TV.
My other dreamcast has no issues going through the same cables (dreamcast AV to Scart) and TV (Beovision MX4200).

Here are a few pictures
Attachments
68542393_1755759891224232_5059739437697597440_n.jpg
Purple..purple. But atleast it reads the UFC fighting disc. 'yay' ;)
rfeztazfter.png
ZD401
rfeztazfter.png (182.71 KiB) Viewed 208 times
69206801_721064278318772_4722707676033712128_n.jpg
Damaged ZD401 and pins/trace going to R and G
68534714_910830525917556_7169705180567437312_n.jpg
FL401 and FL402
67923856_454170841831359_683453786420674560_n.jpg

User avatar
poopidoop
photon blast
Posts: 104

Re: Dreamcast video issue, need help identifying part ZD401

Post#2 » Mon Aug 12, 2019 12:03 pm

might check the pins on your av out on the dreamcast also. see if ones messed up.
Attachments
images.png
images.png (8.5 KiB) Viewed 190 times
download.jpg
download.jpg (5 KiB) Viewed 191 times

User avatar
aldair
dirty sailor
Posts: 180

Re: Dreamcast video issue, need help identifying part ZD401

Post#3 » Mon Aug 12, 2019 12:26 pm

Will have to get dead motherboard from Dreamcast.
To replace this ci.

User avatar
Heavium_k
shadow
Posts: 11

Re: Dreamcast video issue, need help identifying part ZD401

Post#4 » Mon Aug 12, 2019 5:28 pm

No way of getting some wires from red and green to where they need to go you think andhave it operating safely ?
I fear this broken part might cause issues on my tv ..there's a good reason that part is on there.
What is it ? ZD, zener diode, semi conductor ...something ?

I've seen some mainboards on ebay, €24, but sadly i haven't seen faulty ones or faulty dc's much (without crazy shipping costs).. but might keep an eye on them.

User avatar
Heavium_k
shadow
Posts: 11

Re: Dreamcast video issue, need help identifying part ZD401

Post#5 » Mon Aug 12, 2019 5:36 pm

i've seen some that look similar with the five legs but no use if i don't know the specs i need.

User avatar
Xiden
Super Sonic
Posts: 1554

Re: Dreamcast video issue, need help identifying part ZD401

Post#6 » Mon Aug 12, 2019 5:44 pm

Heavium_k wrote:No way of getting some wires from red and green to where they need to go you think andhave it operating safely ?
I fear this broken part might cause issues on my tv ..there's a good reason that part is on there.
What is it ? ZD, zener diode, semi conductor ...something ?

I've seen some mainboards on ebay, €24, but sadly i haven't seen faulty ones or faulty dc's much (without crazy shipping costs).. but might keep an eye on them.


I have a spare DC I could give you, but I'm in the USA. Not sure what shipping costs would be involved.
You will need to swap out the controller board in it, the one in its beyond repair. Also power button seems a little sticky. I bought it on ebay to replace my controller board in my DC. It does come with a Modem version A :)

User avatar
aldair
dirty sailor
Posts: 180

Re: Dreamcast video issue, need help identifying part ZD401

Post#7 » Mon Aug 12, 2019 6:35 pm

Heavium_k wrote:i've seen some that look similar with the five legs but no use if i don't know the specs i need.

I'll do a search to find an equivalent.

User avatar
poopidoop
photon blast
Posts: 104

Re: Dreamcast video issue, need help identifying part ZD401

Post#8 » Mon Aug 12, 2019 7:47 pm

Heres a picture of the schematic if it helps
Attachments
dc schematic.JPG

User avatar
poopidoop
photon blast
Posts: 104

Re: Dreamcast video issue, need help identifying part ZD401

Post#9 » Mon Aug 12, 2019 7:49 pm

sorry the quality is so bad, its the best i could find

User avatar
poopidoop
photon blast
Posts: 104

Re: Dreamcast video issue, need help identifying part ZD401

Post#10 » Mon Aug 12, 2019 7:50 pm

never mind, heres the book for that part lol https://www.datasheets360.com/pdf/455553057108529749

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