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Author Topic: WGM-2775 No Color  (Read 1773 times)

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axl1826

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WGM-2775 No Color
« on: February 27, 2012, 03:09:07 am »
I have a WGM-2775 out of a San Francisco Rush the Rock that is not displaying any color what so ever I have tried several things so far.
-Replaced the tube
-Re-soldered the connections on the flyback
-Replaced the traces on the flyback

But all of this has not fixed the problem  :banghead: do I need new transistors? I am at a loss, any input would be appreciated. I am new to this hobby, I successfully built my own MAME Cab and now my buddy wants me to fix this Rush the Rock, used this forum a lot to build my MAME so I thought I would come here for help.
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grantspain

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Re: WGM-2775 No Color
« Reply #1 on: February 27, 2012, 04:14:45 pm »
on the neck card is there a lm1203n ic?
also i did have the same issue on a u5000 chassis a few weeks back and it took me ages to find the problem,cause was R811 open circuit(100k 0.5 watt resistor)
I can't find the schems for the u2000 chassis but i am guessing its the same chassis without the 24khz support circuit
« Last Edit: February 27, 2012, 04:22:23 pm by grantspain »
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Q*Bert_OP

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Re: WGM-2775 No Color
« Reply #2 on: February 27, 2012, 11:49:48 pm »
R811 (75K ohm, 1/2 watt resistor) is likely the cause of no color. This usually goes open. The IC on the neckboard rarely fails.

Just to clarify, you're getting a picture in black and white, right?
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axl1826

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Re: WGM-2775 No Color
« Reply #3 on: February 28, 2012, 12:37:53 am »
@ grantspain yes the is an IC LM1203N

@ Q*Bert_OP yes I am talking about a black and white picture, I just tested R811 and it is showing 1.45M Ohms of resistance so I will swap it out and let you know what I find from there.

Thanks for your help guys!
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axl1826

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Re: WGM-2775 No Color
« Reply #4 on: February 29, 2012, 07:24:27 pm »
I replaced the suspect resistor and not a whole lot changed unfortunately now the picture looks washed out with a yellow border.

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grantspain

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Re: WGM-2775 No Color
« Reply #5 on: March 01, 2012, 06:05:27 pm »
do any colour pots or the contrast pot have any affect on the picture at all
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axl1826

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Re: WGM-2775 No Color
« Reply #6 on: March 01, 2012, 08:22:13 pm »
All changing the pots seems to do is make the picture washout even more it just gets brighter doesn't matter which color i adjust all the same.
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grantspain

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Re: WGM-2775 No Color
« Reply #7 on: March 02, 2012, 02:15:06 am »
check resistors on remote card
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axl1826

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Re: WGM-2775 No Color
« Reply #8 on: March 02, 2012, 03:57:41 am »
All the resistors on the remote board are within spec
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grantspain

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Re: WGM-2775 No Color
« Reply #9 on: March 02, 2012, 02:36:53 pm »
apart from a pcb track broken on the neck card or all your colour drive transistors are faulty I can't really think of anything else-highly unlikely all the drive transistors would be shot though
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axl1826

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Re: WGM-2775 No Color
« Reply #10 on: March 02, 2012, 08:25:22 pm »
I'll check all the tracks again and see what if i find anything, thanks for your help!
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