Neotec NT-S501 cap kit listing +

[modessitt]

As mentioned elsewhere on this site, I recently repaired a 25" Neotec NT-S501. Originally I thought it was a NT-2501, but now know that it is not.

The original problem was a blown fuse. Replaced the MOSFET at Q101 and that fixed the fuse-blowing issue. Then the chassis had a chirp. Replaced a shorted D403, and that stopped. Cap kit and other info will follow in the next post.

For those that are unaware of the what this chassis version looks like:

 

[modessitt]

Ok, here's the cap kit listing. PLEASE read the notes at the end, as there are some polarity mistakes on the chassis!

<u>Neotec NT-S501 Cap Kit List</u>

<u>Neckboard</u>

C901 - 10uF 50v
C903 - 10uF 50v
C904 - 10uF 50v
C905 - 10uF 50v
C906 - 100uF 16v
C915 - 100uF 16v
C916 - 10uF 50v
C917 - 100uF 16v
C920 - 47uF 160v
C921 - 47uF 160v
C950 - 10uF 50v
C952 - 10uF 50v

<u>Main Chassis</u>

C104 - 330uF 400v (Filter Cap)
C106 - 100uF 35v
C110 - 1uF 50v
C116 - 470uF 16v
C117 - 1000uF 35v
C118 - 100uF 160v
C119 - 100uF 160v
C120 - 1000uF 35v
C121 - 220uF 16v
C124 - 22uF 160v
C126 - 470uF 16v
C129 - 22uF 160v
C130 - 470uF 25v
C201 - 100uF 16v
C203 - 47uF 16v
C204 - 47uF 16v
C251 - 1uF 50v
C252 - 47uF 25v
C301 - 10uF 50v
C305 - 100uF 16v
C308 - 100uF 35v
C309 - 100uF 35v
C312 - 1000uF 25v
C316 - 220uF 25v
C329 - 47uF 16v
C350 - 470uF 16v
C406 - 1uF 50v
C407 - 1uF 50v
C411 - 3.3uF 50v
C412 - 4.7uF 50v
C414 - 470uF 16v
C415 - 2.2uF 50v
C417 - 100uF 160v
C426 - 1uF 250v
C430 - 10uF 50v
C501 - 100uF 35v
C502 - 2.2uF 50v
C504 - 2.2uF 50v
C506 - 4.7uF 50v
C507 - 4.7uF 50v
C508 - 22uF 50v
C550 - 10uF 50v (Bipolar)
C551 - 100uF 35v
C603 - 10uF 50v
C604 - 10uF 50v

Whew! Ok, I mentioned mismarked polarity. It seems quality control isn't what it used to be. I had a lot of fun blowing caps until I figured out which ones were marked improperly.

The following caps should be installed using the polarity markings on the bottom (solder) side of the board, not the top markings:

C117
C121
C411
C414

The following cap should be installed using the polarity markings on the top (parts) side of the board, not the bottom markings:

C426


And for those who may care:

HOT = BU 2525AF

<u>Flyback:</u>
N3410-0080
E204698 CP-808
CHUN PENG
MRCFTR-252 121006

I forgot to write down the regulator info.

Never seen this chassis before, so I'm by no means the expert on its repair, but this may helps someone - someday....

 

[arcadecup]

just a heads up that particular model runs with the samsung yoke.. if you try to mismatch it will start eating hots right away or early.

 

[barakawins]

correction

I have one of these chassis in my Arcade Legends.. Chassis was produced in 2004.
When the chassis heats up, there is a bend (pincushion type) which occurs. I was informed
that the capacitors installed are inferior and go out of range. The tube installed is not
Samsung.. It is an LG tube. Picture is stunning. Ordered cap kit from Bob Roberts.
Will be re-capping this bad boy. Thank you for the polarity warning. Duly noted.. You
just saved me a lot of time and headache!

 

[PinChatt]

I realize this is an old post, but I wanted to note one correction to the cap list.

As noted in the posting above, the PCB markings for polarity for C121 don't match on the top and bottom side of the PCB.

However, the correct orientation for C121 is marked on the TOP side, not the bottom side. In the photo posted above, C121 is located just to the left of the large heatsink in the lower middle portion of the board. It's between the heatsink and the AC power input section. The cap is installed correctly in the photo, with the negative side towards the heatsink.

C121 is a filter cap on the negative 6V supply to the CRT heater. So the positive lead should be grounded.

I have attached the relevant portion of the schematic. You can see this is a negative supply based on the orientation of D108. Both C116 and C121 have their positive lead to ground. I have attached a portion of the top side silkscreen showing C121. This shows the correct orientation. I have also attached a photo of the bottom side of the PCB showing the incorrect polarity marking for C121. The wider trace on the right is ground. The positive lead should be grounded, not the negative lead as (incorrectly) indicated by the dot on the bottom side.

On the chassis that I just recapped, the original C121 was installed according to the marking on the top side of the board, which is correct.

 

[security0001]

I realize this is an old post, but I wanted to note one correction to the cap list.

As noted in the posting above, the PCB markings for polarity for C121 don't match on the top and bottom side of the PCB.

However, the correct orientation for C121 is marked on the TOP side, not the bottom side. In the photo posted above, C121 is located just to the left of the large heatsink in the lower middle portion of the board. It's between the heatsink and the AC power input section. The cap is installed correctly in the photo, with the negative side towards the heatsink.

C121 is a filter cap on the negative 6V supply to the CRT heater. So the positive lead should be grounded.

I have attached the relevant portion of the schematic. You can see this is a negative supply based on the orientation of D108. Both C116 and C121 have their positive lead to ground. I have attached a portion of the top side silkscreen showing C121. This shows the correct orientation. I have also attached a photo of the bottom side of the PCB showing the incorrect polarity marking for C121. The wider trace on the right is ground. The positive lead should be grounded, not the negative lead as (incorrectly) indicated by the dot on the bottom side.

On the chassis that I just recapped, the original C121 was installed according to the marking on the top side of the board, which is correct.

our cap kit explains all the errors on screen printing of the caps which that chassis has 5 caps that have polarity marked different on the component side versus the solder side.

 

[PinChatt]

our cap kit explains all the errors on screen printing of the caps which that chassis has 5 caps that have polarity marked different on the component side versus the solder side.

Understood.

What I'm trying to explain is that there is an error in your cap kit documentation (and the original post on this thread.)

C121 should be installed according to the top side markings, not the bottom side as listed in your kit.

 

[security0001]

Understood.

What I'm trying to explain is that there is an error in your cap kit documentation (and the original post on this thread.)

C121 should be installed according to the top side markings, not the bottom side as listed in your kit.

if my kit has that reversed on the instructions then it would be best to contact me directly through our site to let us know instead of some random posting on a forum that i may or may not see which if i didn't then it would never get changed. thanks for the heads up.

 

[PinChatt]

if my kit has that reversed on the instructions then it would be best to contact me directly through our site to let us know instead of some random posting on a forum that i may or may not see which if i didn't then it would never get changed. thanks for the heads up.

My apologies. I had every intention of contacting you directly to let you know. While I was searching for some clear documentation to bolster my case, I stumbled onto this thread that had the same mistake. So I ended up posting to this thread first. Then I saw you responded here before I sent a message to you. I probably should have contacted you first before posting here.

Just to be clear about this. I've installed dozens of your cap kits in various monitors and you are my go to arcade parts source because I know you always carry top quality parts. The instructions for the cap kits are excellent. The kits are also a real time saver for me. This was the very first time I have come across an error in the documentation (first NT-S501 recap.)