nashou
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Post by nashou on Mar 4, 2014 13:03:04 GMT -5
They all read fine. No shorts.
I'll try to find a 100 ohm 1 watt none on hand. I do have extra 47ohm 1 watt's that i ordered for the one that was bad, I could put them in series that comes to 94 ohms pretty close for now till I get a proper part right?
Nashou
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nashou
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Post by nashou on Mar 4, 2014 12:14:00 GMT -5
Ok removed caps and checked with my Tester all good low ESR .26 ohms.
I put a CC 33.3 ohm resistor i had as a pulled part from my Marquee's VNB. So that is in.
So should I put a new KSA transistor in and try again?
Nashou
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nashou
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Post by nashou on Mar 3, 2014 22:35:11 GMT -5
Ok, lets just start from here. Confirm and replace if needed. R493 = 33ohm, 1w R551 = 100ohm, 1w C419 = Test for short with DMM, ESR (I think you have one, right) C531 = " " " " You didn't respond to my question on R439 and R415. (FL was the problem channel, right?) I'll be back tomorrow. Only R439 yes that is a 1/4 watt. R551 is ok. to test cap i have to remove them for ESR. Nashou Ok No Short on Caps from just using a continuity test and they both measured ok regarding their uf Values. But i put the board back in with no heat sink and used some paper for an insulator so it wouldn't touch the chassis. I used the Test points instead for DC and it was still there.
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nashou
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Post by nashou on Mar 3, 2014 22:14:21 GMT -5
Ok, lets just start from here. Confirm and replace if needed. R493 = 33ohm, 1w R551 = 100ohm, 1w C419 = Test for short with DMM, ESR (I think you have one, right) C531 = " " " " You didn't respond to my question on R439 and R415. (FL was the problem channel, right?) I'll be back tomorrow. Only R439 yes that is a 1/4 watt. R551 is ok. to test cap i have to remove them for ESR. Nashou
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nashou
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Post by nashou on Mar 3, 2014 22:08:14 GMT -5
Ok I do think I have 33 ohm 1 watt resistor. its the same resistor for the marquee VNB Video path to the cathode.
Think that is the issue? R551 reads ok.
Nashou
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nashou
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Post by nashou on Mar 3, 2014 22:03:21 GMT -5
You are on the wrong page. That page is for the 1022 and 42. The 822 is on page 84 and 85. Crap!!!! Nashou
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nashou
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Post by nashou on Mar 3, 2014 21:58:13 GMT -5
I'm showing R493 is 33ohm. Attachments:
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nashou
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Post by nashou on Mar 3, 2014 21:53:17 GMT -5
WAIT!!!! I just realized I may have changed the wrong resistor !!! R493 is not 100 Ohm its 4.7 Ohm!!!!
I bet that made the Transistor fry.
Not sure if I have a 4.7 ohm resistor.
And yes those others are 100 ohms as well , they are a very high quality type tho Vishay CMF55100R00FHEK
Nashou
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nashou
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Post by nashou on Mar 3, 2014 21:42:16 GMT -5
Yep it is bad...... but now the circle pad around the holes fell out. I'll have to solder the leads to the traces or to the closest part.
Should I replace it or test other parts near by?
EDIT: the 100 Ohm resistor was one of the 1/4 watts and not the 1 watt like it should be but it reads fine and the leads seem as thick or thicker than original part.
Nashou
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nashou
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Post by nashou on Mar 3, 2014 21:17:53 GMT -5
Neg probe from R493 to the outer leg pos probe shows .182 flipping the leads shows a short . Also a short from R493 to J536 Nashou Remove Q417 and retest. Apart now going to remove it.
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nashou
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Post by nashou on Mar 3, 2014 20:58:51 GMT -5
Do a diode test of Q417. Make sure it is unplugged. Neg probe from R493 to the outer leg pos probe shows .182 flipping the leads shows a short . Also a short from R493 to J536 Nashou
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nashou
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Post by nashou on Mar 3, 2014 20:51:56 GMT -5
What should be seen at those points? Or at each TP 402 etc?
Nashou
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nashou
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Post by nashou on Mar 3, 2014 20:34:16 GMT -5
What should be seen at those points? Or at each TP 402 etc?
Nashou
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nashou
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Post by nashou on Mar 3, 2014 20:27:32 GMT -5
The leg that goes to R551 is 50.3 J536 is 51.3 and R493 is 53.5, All NEG.
Nashou
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nashou
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Post by nashou on Mar 3, 2014 20:22:42 GMT -5
Attachments:
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