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Ok, finally got some time to investigate the issue on the main board. As it turns out, this had nothing to do with the eMMc. Several of the caps under the processor were shorted. I removed over 45 caps on the board that were shorted, with no luck. Finally, removing the processor cleared the shorts on the pads previously shorted. Internal short in the processor is the root cause. Hope this helps someone else.. at this point, it will take hours to put the caps back, then if the ARM had some pre-programming, that's yet another can of warms that I don't want to go after. I'll hang on to the...2 Photos
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Thank you. I will exhaust the mlcc testing first then consider the emmc replacement.. happy tv is working though. Not sure what the comment from [USER="75051"]Diah[/USER] means or refers toDiahThank you. I will exhaust the mlcc testing first then consider the emmc replacement.. happy tv is working though. Not sure what the comment from [USER="75051"]Diah[/USER] means or refers...
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BL_ON and TCON_ON are not coming from main board, and power_on is high- zero response from the main board. The main board is non-functional. I would love to get to the bottom of exactly what is wrong with the main board. I reflowed processor and eMMc. The proseccor is not warming up at all. No code being executed. Probably replacing the processor? What do you suggest I should try?Last edited by jason123; 09-14-2024, 04:49 PM.
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Davi.p[USER="13553"]Davi.p[/USER] thanks for the advice. No attack here, just the cost of a new mainboard is far cheaper than reballing...
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Thank you, one on order. I have a way to replace the part, and the part is available on ebay, it looks like. I don't have the code or the programming software unfortunately. Thanks again, will post an update once I get the Main board. FYI.. I was board and tried to reflow the ARM processor, just in case, and that made absolutely no change.. sounds like eMMC issue like you said.
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Sony Bravia KD-65X85J No Sign Of life (No BL, Picture, Front LED,..)
Hi Folks,
I have a 65" newer (2021 model) that has no sign of life. No backlight, no front LED (assuming it has one) and no audio or turn on chime.
Photos below of the system
The CN6401 Connector has the following vitals:
STBY_3.3V is 3.432 V
BL_ON low (0.153 V)
BL_ERR low (0.051V)
POWER_ON 3.42 V (as soon as I plug it into the wall this comes on)
REG12V pins 12.7 V
TCON_VCC12V pins low (0.11V)
TCON_ON low (0.155)
Large caps are at 392V as soon as I plug into power
Seems like a Mainboard...
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It does sound like a similar problem. IF it's a diode packe issue, the shorted diode pack gets very hot (be careful not to burn your fingers!), At least it did in my case. You could do some voltage measurements on the PS rails first, just to be sure. Good luck
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Correct #17 stated ESD7004 as an option, I got that and it didn't work. I used the uClamp6514P and that worked fine. System does work without anything stuffed in that location, but I wanted to restore to original factory - bad quality design ...
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ESD7004 Does not work. We need a bidirectional TVS - I tried uClamp6514P does work!
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Confirming that uClamp 6514P works fine to replace the defective IC. ESD7004 (non-bidirectional) DOES NOT work.
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I guess the 6514P is bidirectional and the one I used is unidirectional? Can't think of why else it wouldn't have worked. Can't imagine they just added clamping diodes just because. The fact they failed, tells me these are taking heavy hits, so running without them may not be very smart - I'm guessing [ATTACH=JSON]{"data-align":"none","data-size":"full","title":"ESD7004.jpg","data-attachmentid":3168547}[/ATTACH]...
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I used OnSemi part SZESD7004 and that Did not work. I guess the 6514p seems to have an additional diode on the 3,8 pins.. maybe that's the difference? Anyway I have those on order, just now sure why the OnSemi parts didn't work.Last edited by jason123; 12-26-2023, 05:09 PM.
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