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Coltonhursey
Joined: 28 Sep 2011
Posts: 9
Location: Cave city, ky
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 Posted: Mon Oct 03, 2011 11:43 pm Post subject: |
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| okay, i'll use the STK392-120's, my ebay bucks basically payed for them. if those don't work, then i'm not out anything except for the time it takes for them to get here. |
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JTS1957
Joined: 21 Jan 2009
Posts: 1385
Location: Far, Far Away
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| Posted: Tue Oct 04, 2011 9:56 am Post subject: |
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As long as they're "original Sanyo" and the dealer is very reputable.  |
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Coltonhursey
Joined: 28 Sep 2011
Posts: 9
Location: Cave city, ky
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| Posted: Sat Oct 15, 2011 1:36 am Post subject: |
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so, replaced convergence chips, looking at the solder pads, it is obvious that someone has replaced/tried to replace convergence ICs, alot of the pads were deformed....
but i replaced them, took much longer than it should have.
but to no avail.
set still chirps, until plug 1516 is pulled, then screen slowly increases in brightness until completely white, then shuts off.
also tested all resistors in the vicinity of the convergence ICs, they were all +/- %10
any other suggestions? |
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JTS1957
Joined: 21 Jan 2009
Posts: 1385
Location: Far, Far Away
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| Posted: Sat Oct 15, 2011 6:54 am Post subject: |
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"Now he tells me to try this:"
This quick test will save you from needlessly changing the conv IC's. Remove the plug 1516 from both the LSB and SSM. It plugs in from both boards. Snip the wires to pins 10 and 11 and plug it back in. (There is enough slack to resolder them later). These pins supply the + and - to the audio IC. When you snip the wires and the set starts up, you have a bad audio IC. IC7700-TDA7490-932214750667. If it still does not fire up, you more than likely have conv IC's bad. |
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Coltonhursey
Joined: 28 Sep 2011
Posts: 9
Location: Cave city, ky
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| Posted: Sat Oct 15, 2011 1:58 pm Post subject: |
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i wouldn't think that faulty audio IC's would cause the set to not start....
i'll try that later tonight. |
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JTS1957
Joined: 21 Jan 2009
Posts: 1385
Location: Far, Far Away
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| Posted: Sat Oct 15, 2011 3:47 pm Post subject: |
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The convergence and audio I.C.s share the same + and - voltage.
Oh, remember that troubleshooting, at some point, comes down to "try it and see." |
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Coltonhursey
Joined: 28 Sep 2011
Posts: 9
Location: Cave city, ky
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| Posted: Sun Oct 16, 2011 12:00 am Post subject: |
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yes, i know, i'm slow about this. i've been very busy with work and taking care of someone.
but snipped wire to pin 10 and 11 of plug 1516, and set still chirps. -_- |
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JTS1957
Joined: 21 Jan 2009
Posts: 1385
Location: Far, Far Away
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| Posted: Sun Oct 16, 2011 1:54 am Post subject: |
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Confirm that all voltages are present at connector 1516.
Pin 1 = -35V
Pins 2 & 3 = -22V
Pins 6 & 7 = +22V
Pin 8 = +35V
Pin 10 = +19V (or +24V)
Pin 11 = -19V (or -24V)
The +35, -35, -22 and +22 volt supplies for convergence are supplied by the LSB. The fuses for these supplies are located on the SSM. |
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