Nanao MS8-29SU

For monitor related issues
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grantspain
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Nanao MS8-29SU

Post by grantspain » September 11th, 2008, 8:45 pm

Image

Vertical frame collapse
Q401,Q402 2SD1571
C433 10uf 50volt electrolitic
C437 120uf 50volt electrolitic
R433 0.25W 2K2

Fuse 902 blows
check
Q901
BD901
NTH901
PTH901

No start up
check Q533

Poor colour definition or fading brightness issues

C332 10uf 250v capacitor on the neck card

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Lunatico
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Re: Nanao MS8-29SU

Post by Lunatico » April 15th, 2019, 5:26 am

Sorry for the thread necromancy but I am repairing a a ms8 29su (Nanao 05A00362G1) with a vertical collapse problem.the chasis comes from a never serviced before astro city.

I got a couple of questions:

When I took out c433 it seems it was 50v 1 uf instead of the recommended replacement of 50v 10uf, is there any problem if I use the 50v 10uf replacement?

Also when I took out the Q402 transistor it have the series number of a1408 and after consulting with a friend that have more electronics knowledge than myself it appears that the mentioned transistor is a pnp one while the 2sd1571 its a npn one. Does this would be a problem? Can I put the 2sd1571 to replace the a1408?

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grantspain
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Re: Nanao MS8-29SU

Post by grantspain » April 15th, 2019, 8:28 am

that info is not correct, it looks like a modified post- its not my original post

ms8-29 use an ic for vertical deflection, in your situation replace the components if faulty with same value you remove

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Re: Nanao MS8-29SU

Post by Lunatico » April 15th, 2019, 4:24 pm

Thanks Grant! :D

I will try to source a equivalent for the a1408 as sourcing the part its near imposible in my country, Also I would love to know if you could help me locating the following components:

R433
R436
C437

I spended near 2 hours searching and I could not find em :cry: .

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grantspain
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Re: Nanao MS8-29SU

Post by grantspain » April 15th, 2019, 6:03 pm

you won't find them, that info you posted is for nanao ms8-26su
for the ms8-29su you need to replace following
ic 401 la7832-and check for broken tracks
r428 2.2ohm metal oxide

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