Please Help


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Please Help

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spacebluesonoma
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Sep 28, 2005, 5:10 PM

Post #1 of 6 (1152 views)
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Please Help	Can't Post

Well I am working a no picture good audio issue on a television. It started out with a blue screen or a black screen with blue horizonal lines. Upon inspection, the board on the back of the CRT was in bad shape so I started there and resoldered everything. When I put it back in, I screwed up hooking it up and swapped the KA and MY wires. NOW the tv powers up screen is grey/white with black lines on it, and no audio or control. Did I fry something hooking it up wrong or did the resoldering cause this problem. What should I look at?

Any advice is GREATLY appreciated

mel
Veteran

Sep 28, 2005, 9:47 PM

Post #2 of 6 (1144 views)
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Re: [spacebluesonoma] Please Help [In reply to]	Can't Post

We might be able to figure out what the KA and MY wires are if you posted the make and model number of the set.

spacebluesonoma
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Sep 29, 2005, 12:44 PM

Post #3 of 6 (1136 views)
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Re: [mel] Please Help [In reply to]	Can't Post

oops, i guess that would help.

It is a Mitsubishi CS-27403

Thanks All

mel
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Sep 29, 2005, 10:03 PM

Post #4 of 6 (1127 views)
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Re: [spacebluesonoma] Please Help [In reply to]	Can't Post

My schematic doesn't list anything like KA and MY so I still do not know which wires you crossed nor the the potential consequences.

spacebluesonoma
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Sep 30, 2005, 12:31 PM

Post #5 of 6 (1122 views)
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Re: [mel] Please Help [In reply to]	Can't Post

Thanks for the help Mel. Try this and if this does not work, i will pull the main board and see if I can figure out what these wires go to. I know from the schematic this might not help, but hopefully they have a picture of the CRT board in the manual? One 2 wire socket is just below R6946, the other is just above D8005

Please let me know if this helps, thanks

mel
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Sep 30, 2005, 10:50 PM

Post #6 of 6 (1116 views)
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Re: [spacebluesonoma] Please Help [In reply to]	Can't Post

I am working from a package that seems to be similar to your model number so I can't be positive but it appears that pin 3 of the KA connector is at ground while pin 3 of the MY connector is at 124 volt thru a resistor and diode. I cannot find the source for the KA input but I suspect that it is a B+ voltage from the power supply. Since the MY pins are across a low ohms coil, it may also have blown the coi; as well as the B+ source there. Bad news but I hope that this helps.

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