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jasonsmith
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« on: April 25, 2014, 09:18:21 pm » |
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Okay need some advice and help. I did a full cap kit on my K4600, double and triple checked all polarities and joints etc. On the first power up the monitor came alive and all was well for about 30 secs when all of a sudden I heard a static type noise, the screen did the CRT horizontal bright off thing, similar to the android phone CRT animations and then I saw smoke.
Followed the smoke to the R504 resistor on the power board. It was totally burnt up.
What now?
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jasonsmith
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« Reply #1 on: April 25, 2014, 11:06:20 pm » |
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The main power transistor has something rattling inside and it directly feeds power through the blown resistor. I'm hoping that it's the issue and that my tube didn't blow.  |
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Tighe
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« Reply #2 on: April 26, 2014, 07:12:44 am » |
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You should post this in the monitor repair section on KLOV there are a few guys there that really know their stuff.
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iankellogg
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« Reply #3 on: April 26, 2014, 02:00:56 pm » |
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R504 is on the audio and power PCB.
C501 is a 10uF 160V (i packed probably a 250V) Double check the polarity on that cap.
Also check TR501.
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iankellogg
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« Reply #4 on: April 26, 2014, 02:14:29 pm » |
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Also just to tell you. I've done cap kits to monitors that were kind of working only to have them blow something immediately afterwards. It's like the shitty caps were keeping the thing alive.
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jasonsmith
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« Reply #5 on: April 26, 2014, 02:52:57 pm » |
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I totally believe that Ian. I think I opened up a can of worms with this K4600. There's been so many little mods and fixes done to it I have no idea where to even start.
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iankellogg
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« Reply #6 on: April 26, 2014, 02:55:11 pm » |
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Start with the burnt resistor. Check for shorts on that pcb. I listed to things that are around to check.
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jasonsmith
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« Reply #7 on: April 26, 2014, 02:57:30 pm » |
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Oh awesome didn't see that post, thank you. I sure hope I didn't blow the yoke or tube or something more serious.
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jasonsmith
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« Reply #8 on: April 26, 2014, 03:04:25 pm » |
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iankellogg
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« Reply #9 on: April 26, 2014, 03:16:13 pm » |
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Some of those might be factory installed mods. If you have the patience I will pull my K4600 out and take pictures. I need to cap it anyways. In the mean time double check those items above. You will have to remove the transistor before you test it.
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jasonsmith
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« Reply #10 on: April 26, 2014, 03:22:13 pm » |
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Thanks Ian, I'm patient.
The cap polarity is good and nothing is bridged. Am looking for an alternate to the TR501 locally. It's a 2SC1740Q, not sure if a straight 1740 will work or what. If I was going to pull it out thought I may as well just put a new one back in.
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iankellogg
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« Reply #11 on: April 26, 2014, 03:24:19 pm » |
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Considering the price on these transistors I would advise you to just check it. No sense replacing unbroken parts.
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jasonsmith
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« Reply #12 on: April 26, 2014, 03:28:03 pm » |
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Wise words my friend, thank you. Need to learn and not pick up bad habits. It's funny, I'm looking at it now and it's a C1815 that's installed, not what it should be???
I'll test it anyway as I need to learn how to do that.
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iankellogg
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« Reply #13 on: April 26, 2014, 03:30:55 pm » |
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schematic lists it as
2SC1740 or 2SC1815
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jasonsmith
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« Reply #14 on: April 26, 2014, 03:41:45 pm » |
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Ah seeing that now, it's funny because on the parts list it shows the Q, silly me I never looked deeply for that number on the schematic.
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