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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Mon Jul 01, 2013 6:10 am Post subject: |
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Look down there near the edge connector, black component to the lower right of C2...has a 2 directly below it.
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gjaky
Joined: 05 Jun 2010
Posts: 2802
Location: Budapest, Hungary
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| Posted: Mon Jul 01, 2013 6:40 am Post subject: |
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I would think you should try to replace that capacitor and resistor that Case pointed out. C27 is a drop tantallum capacitor, sometimes they go short after extended resting, the resistor probably smoked because the short in that power rail, wait till some marquee guys report what are the values of those two parts, you actually can't loose anything if you try to replace them... Once you repalaced them, make sure you pull out the P14 plug before firing up the machine, if it seems to work for 30 minutes at least, then you can go on with the filaments attached.
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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mx83toy
Joined: 14 Dec 2012
Posts: 322
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| Posted: Mon Jul 01, 2013 7:19 am Post subject: |
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Thankyou gentlemen... I'll hopefully get some values soon off the guys....
ohh P14 ?? I think i should look into this as i didn't do this last time thank you might of even helped this time around??? live and learn i guess...
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mx83toy
Joined: 14 Dec 2012
Posts: 322
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| Posted: Mon Jul 01, 2013 8:22 am Post subject: |
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C'mon marquee guys!!! Get with it!!!!
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Mon Jul 01, 2013 8:39 am Post subject: |
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No i think itll just stop you burning a spot into each tube.
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stridsvognen
Guest
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| Posted: Mon Jul 01, 2013 9:16 am Post subject: |
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I cant see any markings on the cap that make sense to me, but the resistor is measuring 10 ohm on the board, and its the same as the one next to C37.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Mon Jul 01, 2013 9:24 am Post subject: |
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What is written on the capacitor?
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mx83toy
Joined: 14 Dec 2012
Posts: 322
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| Posted: Mon Jul 01, 2013 9:45 am Post subject: |
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Thank you so much!!! This might make sense of the drop t cap. http://www.csgnetwork.com/capcctantcalc.html
They seem to be just a solid colour as the code??? The resister I'll need to find too ... Once again thank you...
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stridsvognen
Guest
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| Posted: Mon Jul 01, 2013 10:09 am Post subject: |
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107
20K
+425
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mx83toy
Joined: 14 Dec 2012
Posts: 322
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| Posted: Mon Jul 01, 2013 11:09 am Post subject: |
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Ok so the resistor is only measuring 6 ohm so that's def fried... That cap does look different to the others identical but bigger... I'll need to do some shopping this week and learn some board soldering 
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Mon Jul 01, 2013 11:34 am Post subject: |
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| stridsvognen wrote: | 107
20K
+425 |
So that's 100µF / 20V.
You can get them from Mouser, Farnell and other suppliers.
Some Part numbers (Mouser):
581-TAP107K020CCS (AVX)
581-TAP107K020CRW (same)
80-T350M107K020AT (Kemet, original manufacturer)
Regards,
barclay66
Edit: Make sure it's the capacitor itself. From the picture it is not clear to me if the capacitor produced the heat or if the adjacent chip was the source. In any case I would swap this part too as it might have been damaged due to intense heat.
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Mon Jul 01, 2013 11:56 am Post subject: |
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| stridsvognen wrote: | 107
20K
+425 |
107 is 100uF with a 10% tollerance. But id confirm that before you go ahead cause i never learned to read capacitors that way. I dont know the voltage either.
Edit: Barclay beat me. I would also replace the IC he speaks of, however id says the capacitor did that to the IC.
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mx83toy
Joined: 14 Dec 2012
Posts: 322
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| Posted: Mon Jul 01, 2013 3:34 pm Post subject: |
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Makes sense to replace the ic too... I just need to figure out what one is what it does a d if I can get another ...
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Mon Jul 01, 2013 6:15 pm Post subject: |
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Hi,
That's a LM358N. Op-Amp, very common, nothing special. There are three in a row below the bad cap.
In order to protect the PCB, I would recommend cutting off the legs of the old one and desoldering one by one. Then remove the solder from the holes (solder pump or wick) and mount the new one. Or You coild mount a good quality socket and plug the chip into that...
Regards,
barclay66
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Mon Jul 01, 2013 10:35 pm Post subject: |
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I would just use the GOOT solder sucker and desolder all 8 legs, then it should come straight out. 
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mx83toy
Joined: 14 Dec 2012
Posts: 322
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| Posted: Mon Jul 01, 2013 10:45 pm Post subject: |
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Ok good as once I get the parts your probly doing the repairs
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mx83toy
Joined: 14 Dec 2012
Posts: 322
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| Posted: Mon Jul 01, 2013 11:13 pm Post subject: |
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Ok so I found the cap and op amp... How do I find this resistor??? So many different types and I'm still a bit of a newb with electronics I'm on the mouser site (pretty cool site btw never been there)
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CasetheCorvetteman
Joined: 09 Nov 2008
Posts: 6326
Location: Australia
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| Posted: Tue Jul 02, 2013 12:50 am Post subject: |
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Check out locally in Jaycar first.
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barclay66
Joined: 27 Jun 2011
Posts: 1304
Location: Germany
TV/Projector: Marquee 9500 Ultra
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| Posted: Tue Jul 02, 2013 6:54 am Post subject: |
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| mx83toy wrote: | | Ok so I found the cap and op amp... How do I find this resistor??? So many different types and I'm still a bit of a newb with electronics I'm on the mouser site (pretty cool site btw never been there) |
Hi,
On the Mouser website You can filter according to the specs You need. Use the following parameters:
Products: Passive Components
Product category: Resistors
Power Rating: 500mW (1/2W)
Resistance: 10 Ohms
Termination style: Axial
Tolerance: 2% (original has 5%)
You should get less than a dozen from which You can use any of them (check pricing and availability)...
Regards,
barclay66
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