Hello Badcaps gurus, need some advice with TV, Samsung QN75Q6DRAFXZA, had blinks and restart, starting with one ribbon disconnected (any of two), after some ducktape experiments I got it working, but it has some lines, I'm not a pro, and need some advice.
Transparent tape - top ribbon (right), blue tape lower ribbon (left)
Is there any chance to make picture better and where to dig...
Hello guys, so delay switch powered from USB is not working perfect, USB can randomly turn off while watching TV, I need to find some other 5v source, or 12v, have also 12v delay timer relay, any ideas where I can get 5v turn on? Also I was thinking ab 555 timer, need 1-2 sec delay, can someone suggest R and C for 1-2 sec?
Ok, finally got my delay switch, installed, took power 5v from USB on board, delay is set to ab 2 sec, TV is working as expected, thank you everybody for your help and ideas, maybe this one would be useful for someone else....
so with one of described pins disconnected power-on then 3 sec wait then connect wire, tv starts with perfect picture, was working for whole day no issues, will try 1Mo resistance yesterday, and delay switch ordered, probably would take few weeks to come. I could not find any shorts tried tape method on all pins, only those I described prevent power cycling
Tried everything... And I got one idea... what if I'll put some delay switch like this [url]https://www.aliexpress.us/item/3256805559478462.html?spm=a2g0o.productlist.main.39.15884cc7Blq37a&algo_pvid=9310aab1-673e-4637-b820-21251a36c7c4&aem_p4p_detail=2023122013294214477768452240100001074166&algo_exp_id=9310aab1-673e-4637-b820-21251a36c7c4-19&pdp_npi=4%40dis%21USD%213.99%213.75%21%21%213.99%21%21%402103241d17031077825448802e7543%2112000034195967861%21sea%21US%21125539771%21&curPageLogUid=uBGcaHbMkdhX&search_p4p_id=2023122013294214477768452240100001074166_4[/url]Tried everything...
Just tried, was not able to get a picture but if I cover one of pins, TV is not restarting so if you look at main board top ribbon (right on LCD) second or one before last, and on lower ribbon (left on LCD) first and last, covering any of those pins will get tv of power cycling but there is no picture.
Got same TV (UN70NU6900FXZA) but fix did not work for me, tried different resistors, tried direct wire, with one ribbon disconnected tv does not recycle power, with ribbon plugged in 2-3 sec after power on, I get perfect picture till next power cycle, please help with ideas )
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Voltage on picture, so it's switching from one to another, looks like main board is trying to reset itselfRe: Samsung smart tv bad power board BN44-0503A
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Voltage on picture, so it's switching from one to another, looks like main board is trying to reset itself...
So what I did, I replaced resistors RP810 and RP810 and QP801S, after that board not exploded and LED light started to blink (5 times double blinks), nothing on backlights connector (0V), checked backlight with LED tester, looks good and working
mainboard connector:
PIN14 (Power On_off): 3,2V
PIN12 (A5V): 5V
CP818 and CP819 - no short
DP802, DP803, DP808 - no short, reverse ok
BD801S no short, shows 0.555 one way only (soldered)
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