howie
Junior Member
Posts: 87
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Post by howie on Nov 12, 2017 19:39:23 GMT -5
I have put it away for the night and won't have time to smash it with a hammer again until Tuesday night Hahahaha!!!. Let me know if you need help. I have a special hammer for problematic boards. Makes smaller pieces. I don't think there's a chance in hell of getting a service manual from Crestron. They are so tight they squeak.
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howie
Junior Member
Posts: 87
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Post by howie on Nov 12, 2017 19:11:17 GMT -5
On this side of the board power stops here. This is the first device for 24 VDC+ after the power connector. I can find ground or 24VDC- all over the board. When I ohm it out, sometimes it reads open and others about 190 ohms. Perhaps that was me unknowingly reversing the probes. If it is a diode then power must be going out on the bottom of the board. I have put it away for the night and won't have time to smash it with a hammer again until Tuesday night
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howie
Junior Member
Posts: 87
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Post by howie on Nov 12, 2017 12:44:06 GMT -5
well that didn't work have to figure out how to post a picture
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howie
Junior Member
Posts: 87
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Post by howie on Nov 12, 2017 12:40:57 GMT -5
This touch screen has been flaky in the past. If a power outage occurs it may or may not power back up normally. It has a 24 VDC external power supply I put it on a UPS to help protect it. Lost power the other night and the ups crapped out before the power was restored. Now it won't power back up again. I have 24 volts to the part next to the number 6 and that's where it stops. What are parts 6 and Z3 in the picture 1315498136736.bmp (900.05 KB)
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howie
Junior Member
Posts: 87
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Post by howie on Nov 10, 2017 16:17:06 GMT -5
Just to follow up, HDMI is not blocked. Tried both simplink on and off which made no difference. Tried to enter service mode using both menu buttons but would not go.
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howie
Junior Member
Posts: 87
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Post by howie on Nov 5, 2017 21:07:06 GMT -5
How to perform "master reset"? The cable that doesn't connect in HDMI 1 works in HDMI 2 Don't recall seeing "simplink" in the menu. Will go look for that now.
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howie
Junior Member
Posts: 87
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Post by howie on Nov 5, 2017 17:00:22 GMT -5
I can't seem to get a break. I only opted to fix this TV because it has 4 HDMI inputs, 2 component and 2 composite inputs All of which are being used. Also, the set is controlled via the serial port from my Crestron system. I put the new main board in and it powered right up. Everything looked normal until I plugged in all the inputs. Then I discovered that HDMI 1 was dead. TV switches to it but it doesn't connect. Tried other sources and cables with no luck. This is a new board. Not a used one. I sent a message to the seller this morning. Hope he has another to exchange it with.
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howie
Junior Member
Posts: 87
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Post by howie on Oct 30, 2017 16:56:33 GMT -5
Status, dead Don't have the caps to replace the ones suspected bad and running out of time to deal with it. Ordered a replacement new main board and hope for the best
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howie
Junior Member
Posts: 87
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Post by howie on Oct 29, 2017 18:11:41 GMT -5
So curiosity got the best of me. Wanted to know if the 5 volt error signal came from the main board or the power supply. So I cut the wire and re-probed The 5 volts is coming from the power supply. When cut, zero volts at pin 22 on the main board but it still doesn't power up
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howie
Junior Member
Posts: 87
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Post by howie on Oct 29, 2017 17:42:19 GMT -5
There is 2 reset buttons on the main board. What's their function and how do you use them (I know you have to push them) I'm guessing that voltage on pin 22 is somehow blocking the power supply from coming on??? Can you cut it for a quick test???
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howie
Junior Member
Posts: 87
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Post by howie on Oct 29, 2017 17:39:59 GMT -5
Showing 4.13V on pin 22 The small board is showing 3.3v at 1 and 2 and 3 and 4. I don't think it's a panel issue as it won't power up with the ribbon cables detached. Both back lights come on when the PS is jumped out. Unplugged back lights to make sure they were not pulling to much. Still think it's a bad main board.
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howie
Junior Member
Posts: 87
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Post by howie on Oct 29, 2017 14:46:40 GMT -5
Way high capacitance. ESR's were low. Also not quite sure of the effect of using clips and push pins to probe the in circuit caps
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howie
Junior Member
Posts: 87
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Post by howie on Oct 29, 2017 7:41:38 GMT -5
FYI power supply has been jumped out with back lights on for about a hour and the supply voltages have not changed.
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howie
Junior Member
Posts: 87
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Post by howie on Oct 29, 2017 7:30:24 GMT -5
Not a big fan of in circuit cap testing. Using my Peak ESR+ ESR70 most caps actually tested way high. That said, these came back reistering low or leaky in circuit C163 330 uf C165 330 uf C603 10 uf C600 10 uf C1019 100 uf
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howie
Junior Member
Posts: 87
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Post by howie on Oct 29, 2017 7:06:33 GMT -5
Pulled the board back out for closer inspection While doing that, jumped out the ps again including calling on the back lights and leaving it running. Retested ps voltages. The pin 4 and 5 5.2V measure 5.14 each and rock steady. 12V measures 12.07 and rock steady. the 20V pin registers 19.41 and is rock steady. This is with the plug P700 jumped with 100 ohm resistors and P201 back probed and monitoring each one while running.
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