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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Wed Jan 09, 2013 6:49 pm Post subject: |
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Oh, and by the way. My China supplier got back to me and the KIA578's are available at a much cheaper price, if it ends up you need any.
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Zerog
Joined: 05 Jan 2013
Posts: 35
Location: Southern California
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| Posted: Wed Jan 09, 2013 10:56 pm Post subject: |
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The number jumps around wildly at first in the hundreds but then quickly stabilizes at 045.
BTW, good to know your China supplier has the KIA578s. Is there a minimum order?
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jan 10, 2013 5:39 pm Post subject: |
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Sorry for the delay. Been sick yesterday and today.
That number is to low. Disconnect BN94 and do the same test again with your DMM .
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Zerog
Joined: 05 Jan 2013
Posts: 35
Location: Southern California
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| Posted: Thu Jan 10, 2013 6:38 pm Post subject: |
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Get well soon - lots of flu out there.
BN94 is soldered in, so I disconnected it from the other end.
The readings vary a lot. But the results go from 1000+ to 850 to 630 to 1.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jan 10, 2013 7:44 pm Post subject: |
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Ok, put that ic91 back in and leave that harness disconnect and see if you now have the +5v at BN94, pins 4 and 5 on that regulator board.
Edit: wait a minute. You should be reading open. You are testing pin connectors 2 and 3 for ic91 and BN94 harness is disconnected at other end, right?
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Zerog
Joined: 05 Jan 2013
Posts: 35
Location: Southern California
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| Posted: Thu Jan 10, 2013 10:13 pm Post subject: |
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Right, it goes to open in a second or two
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Thu Jan 10, 2013 10:17 pm Post subject: |
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Ok, then back to this.
| Quote: | | Ok, put that ic91 back in and leave that harness disconnect and see if you now have the +5v at BN94, pins 4 and 5 on that regulator board. |
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Zerog
Joined: 05 Jan 2013
Posts: 35
Location: Southern California
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| Posted: Fri Jan 11, 2013 4:07 pm Post subject: |
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Nope. 0.0V at both 4&5. The other pins how the proper voltage (1&3 = 15.13V; 8= 4.95V).
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jan 11, 2013 4:51 pm Post subject: |
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Hmmm, are you able to get your test probe in to the pins of ic91 and see if you have voltage on pins 1 and 4?
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Zerog
Joined: 05 Jan 2013
Posts: 35
Location: Southern California
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| Posted: Fri Jan 11, 2013 5:04 pm Post subject: |
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| macgyver655 wrote: | | Hmmm, are you able to get your test probe in to the pins of ic91 and see if you have voltage on pins 1 and 4? |
Pin 1 is 15.35V and pin 4 is 0.0V
(FWIW, I've noticed from time to time that the power on/standby gets a little flakey. Sometimes it just turns on as soon as I plug it in, sometimes it takes a few button presses.
In any event, I do hear the relays click in.)
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jan 11, 2013 5:07 pm Post subject: |
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| Zerog wrote: | | macgyver655 wrote: | | Hmmm, are you able to get your test probe in to the pins of ic91 and see if you have voltage on pins 1 and 4? |
Pin 1 is 15.35V and pin 4 is 0.0V
(FWIW, I've noticed from time to time that the power on/standby gets a little flakey. Sometimes it just turns on as soon as I plug it in, sometimes it takes a few button presses.
In any event, I do hear the relays click in.) |
No, I mean the pins "of" ic91, not the connector. Pin 1 should be +8v and pin 4 slightly less.
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Zerog
Joined: 05 Jan 2013
Posts: 35
Location: Southern California
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| Posted: Fri Jan 11, 2013 5:16 pm Post subject: |
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Must....have....coffee...
on IC91: Pin 4 is 8.77 and pin 1 is 4.74
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jan 11, 2013 5:32 pm Post subject: |
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| Zerog wrote: | Must....have....coffee...
on IC91: Pin 4 is 8.77 and pin 1 is 4.74 |
Are you sure it's not the other way around? Pin 1 should definitely have +8v since you indicated CN96, pin 1 had +8v and it's the same line.
Now test pin 2 on the ic. Might as well test pin 3 also while your at it.
BN94 harness is still disconnected, right?
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Zerog
Joined: 05 Jan 2013
Posts: 35
Location: Southern California
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| Posted: Fri Jan 11, 2013 5:44 pm Post subject: |
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You're right - I had it upside down. Just consulted the data sheet and pin 1 is the closest to the edge of the board.
The harness for BN94 is still disconnected.
Pin 2 and Pin 3 both read 0.0V
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jan 11, 2013 5:58 pm Post subject: |
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Looks like it's bad. What is the voltage on pin 4 of ic92 which should be right next to there.
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Zerog
Joined: 05 Jan 2013
Posts: 35
Location: Southern California
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| Posted: Fri Jan 11, 2013 6:36 pm Post subject: |
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7.97V for Pin 4 IC92
Be back in a couple of hours.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jan 11, 2013 7:30 pm Post subject: |
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Well I was expecting 4.74 being the same as the other ic but ic91 is surely bad. But before ordering any parts I think we should continue doing some testing to see if something else is shorted and caused the regulator to go.
I would go to the video board, CN21 which is where you have that harness already disconnected. Leaving it disconnected and not turned on, set you DMM to resistance and test between pins 5 and 6. What is the reading?
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Zerog
Joined: 05 Jan 2013
Posts: 35
Location: Southern California
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| Posted: Fri Jan 11, 2013 8:46 pm Post subject: |
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It's open.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jan 11, 2013 8:52 pm Post subject: |
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Alright, if it tests open then it should be fine. Did you want to get the regulator from Marantz then or my China supplier? Marantz was 12.80 plus 7.00 shipping and you would probably have it in a couple days.
China supplier price is dependent on how many you order. I was given an estimate of 2.15 each for 20 pieces. Less amounts can be ordered but I would have to recheck the price if you only wanted 2 or 3. Shipping is usually 10.00 for HK post with a 10 to 14 day ship.
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macgyver655
Joined: 22 Aug 2007
Posts: 8508
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| Posted: Fri Jan 11, 2013 9:00 pm Post subject: |
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Also I would like you to make 1 more test on that video board. Locate C795 (100u/16v) and with DMM on resistance test between the neg side of the cap and pin 5 of CN21.
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