nashou
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Tech in Training.....
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Post by nashou on Feb 24, 2017 22:14:33 GMT -5
Got Sharp TV here that has some blown parts. need service manual to identify. Also the 220uf 450v filter cap measured only 2 nf on my meters, used all of them just to be sure . Never seen a filter cap go bad before. I took the cover off and the top was bulging but did not break the vent creases .     |
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Post by mastertech on Feb 24, 2017 22:46:38 GMT -5
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nashou
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Tech in Training.....
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Post by nashou on Mar 2, 2017 0:06:35 GMT -5
Well no go. Replaced parts and nothing. Too late now to test further. Off to bed.
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Post by mastertech on Mar 2, 2017 18:39:58 GMT -5
What all parts have you changed?
What does it do or not do?
Have you tested any voltages?
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nashou
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Tech in Training.....
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Post by nashou on Mar 2, 2017 22:27:48 GMT -5
What all parts have you changed? What does it do or not do? Have you tested any voltages? Ic 903, R 985 and the main capacitor C907. On the rectifier I have -71 and + 80 or so. On one side of D924 I have 199vdc and on the other the meter goes wacky? pressing the power button does nothing. |
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Post by mastertech on Mar 3, 2017 17:32:09 GMT -5
What do you have at connector CN902, 5v,12v,24v and standby?
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nashou
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Tech in Training.....
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Post by nashou on Mar 3, 2017 21:54:22 GMT -5
What do you have at connector CN902, 5v,12v,24v and standby? only 2.97 at 11,12 nothing everywhere else. |
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Post by mastertech on Mar 3, 2017 22:07:22 GMT -5
Can you disconnect the harness from CN902 and recheck 11,12?
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nashou
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Tech in Training.....
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Post by nashou on Mar 3, 2017 23:29:22 GMT -5
Can you disconnect the harness from CN902 and recheck 11,12? Disconnected i get 4.45 vdc Hurt my back the other day so moving slow. Nashou |
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Post by mastertech on Mar 4, 2017 12:04:37 GMT -5
Try replacing C955 and see if that 5v comes up.
Sorry to hear about your back. I know what that is like. Hope it gets better soon.
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nashou
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Tech in Training.....
Posts: 1,239
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Post by nashou on Mar 4, 2017 18:11:37 GMT -5
Try replacing C955 and see if that 5v comes up. Sorry to hear about your back. I know what that is like. Hope it gets better soon. Not with CN902 connected to the tuner/input board. Still the same 2.7 vdc.....maybe I need to check the dual Diode D927? |
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Post by mastertech on Mar 4, 2017 18:19:16 GMT -5
It is hard to tell if the 5v is just weak or something is pulling that line down. Since you do not have a good 5v with the harness disconnected.
Lets try powering up the PS itself. Disconnect that harness again and with it unplugged, jump pins 10 and 11. This will send the 5v into the standby to turn on the full PS. Wear safety glasses when you plug it in, in case any parts explode. Just plug it in and see what happens. If no smoke or parts flying then test to see if you have the 12v and 24v.
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nashou
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Tech in Training.....
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Post by nashou on Mar 4, 2017 18:38:14 GMT -5
It is hard to tell if the 5v is just weak or something is pulling that line down. Since you do not have a good 5v with the harness disconnected. Lets try powering up the PS itself. Disconnect that harness again and with it unplugged, jump pins 10 and 11. This will send the 5v into the standby to turn on the full PS. Wear safety glasses when you plug it in, in case any parts explode. Just plug it in and see what happens. If no smoke or parts flying then test to see if you have the 12v and 24v. Should I leave the other two harneses connected that go to the LED driver board( i think thats what the board is called) ? Might be some time before I do this. Going to soak in my Jacuzzi with some epson salt for the back. Nashou |
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Post by mastertech on Mar 4, 2017 18:49:38 GMT -5
Disconnect them. Yes, go relax.
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nashou
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Tech in Training.....
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Post by nashou on Mar 4, 2017 19:07:18 GMT -5
Disconnect them. Yes, go relax. Well, one of the hot water tanks I had unplugged so its going to take time for it to get enough hot water for the jacuzzi, so I'll go try this now. Cross fingers. |
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