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Author Topic: Sanyo monitor picture missing colour  (Read 2233 times)

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neokidgeo

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Sanyo monitor picture missing colour
« on: February 17, 2008, 10:14:07 am »
Hi guys,

I've fired up one of my namco bootleg cabs with a board in it and i got pic's but when i turn the screen up i get red raster lines, Any ideas guys  ??? i can see any model number anywhere only part numbers so heres a pic hope that helps ident  :)

Thanks guys
Neo
« Last Edit: February 17, 2008, 12:10:24 pm by neokidgeo »
UkVacer

grantspain

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Re: Sanyo monitor red raster lines only
« Reply #1 on: February 17, 2008, 10:44:53 am »
if you have a actual picture with red flyback lines then you red background is too high,locate the red adjustment and turn it down
btw thats the most connector block i have seen on a monitor ;)

neokidgeo

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Re: Sanyo monitor red raster lines only
« Reply #2 on: February 17, 2008, 12:09:40 pm »
Hi grant,

This is what i'm getting after turning all the controls up full apart from the green drive that the neck board don't have  ???

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grantspain

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Re: Sanyo monitor picture missing colour
« Reply #3 on: February 17, 2008, 12:17:23 pm »
i can't see the blue,how many controls do you have for the colours?

neokidgeo

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Re: Sanyo monitor picture missing colour
« Reply #4 on: February 17, 2008, 12:22:58 pm »
I have green,blue,red then red drive and blue drive but there seems to be no green drive pot or markings where there should be one.
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grantspain

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Re: Sanyo monitor picture missing colour
« Reply #5 on: February 17, 2008, 12:28:46 pm »
http://therealbobroberts.net/sanyo.html
this is your monitor
most monitors do not have a green drive
turn down the backgrounds to about quarter way,then turn down the red and blue drive to match the green then bring up contrast and brightness
like i said i can't see any blue,you need to prove the blue is present

neokidgeo

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Re: Sanyo monitor picture missing colour
« Reply #6 on: February 17, 2008, 01:49:59 pm »
Did what yu said grant but didn't change so i turned the cotrols down and turn them up one at a time and this is what i got, Green and red turn up and down nice but the blue pot only starts working 3/4 way round.

Green, Blue, Red


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grantspain

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Re: Sanyo monitor picture missing colour
« Reply #7 on: February 17, 2008, 01:59:45 pm »
got this bad feeling your tube is bad on the blue gun
you could swap out the blue and red drive transistor to prove it not a bad transistor

neokidgeo

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Re: Sanyo monitor picture missing colour
« Reply #8 on: February 17, 2008, 04:10:40 pm »
Swaped over but no luck  :cry:
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grantspain

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Re: Sanyo monitor picture missing colour
« Reply #9 on: February 17, 2008, 04:27:56 pm »
i would like to see what ken and qrz say about this as i am convinced your tube is a gonna,it would be good to get a second opinion.
i hope i am wrong but i don't think so :(

neokidgeo

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Re: Sanyo monitor picture missing colour
« Reply #10 on: February 17, 2008, 04:44:03 pm »
Thanks for your help grant  :notworthy:
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neokidgeo

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Re: Sanyo monitor picture missing colour
« Reply #11 on: February 18, 2008, 03:18:25 pm »
Quick update the tube is good, I tried the chassis on a diffrent tube i have and the picture was the same, The connector blocks hide a few hacks, The rgb sync and ground wires from the loom are soldered to resistors and the blue from the chassis to the neck board was soldered to a resistor on the chassis, I de soldered and put the blue back to where it should be and the blue on screen was a little bit stronger but not enough  :cry: o well hunt for a replacement chassis starts but does anyone know the model of it?

Thanks guys
Neo
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Re: Sanyo monitor picture missing colour
« Reply #12 on: February 18, 2008, 03:49:23 pm »
well thats good news and a good bit of detective work,in this scenario it would be wise to start comparing the different colour lines with a multimeter or swap out pots,caps and resistors also check the board tracks for breaks

Ken Layton

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Re: Sanyo monitor picture missing colour
« Reply #13 on: February 19, 2008, 02:49:16 am »
Hi guys,

I've fired up one of my namco bootleg cabs with a board in it and i got pic's but when i turn the screen up i get red raster lines, Any ideas guys  ??? i can see any model number anywhere only part numbers so heres a pic hope that helps ident  :)

Thanks guys
Neo

What the hell happened to that chassis? What's that mess of wires? That looks horrible.

Has this chassis been recapped and solder joints checked?

neokidgeo

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Re: Sanyo monitor picture missing colour
« Reply #14 on: February 19, 2008, 01:44:02 pm »
Hi ken,

I will have a look when i get home, Yep its got more wires then radio shack, it's been badly repaired and it looks new almost  :dunno
I been trying to find a model number but i've had no luck just part numbers that come up with nothing on google.
Wil report back  :)
UkVacer