Transparent tape - top ribbon (right), blue tape lower ribbon (left)
Is there any chance to make picture better and where to dig...
xfox
Senior Member
Last Activity: 01-10-2025, 10:39 PM
Joined: 02-08-2018
Location: Phily, PA
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QN75Q6DRAFXZA LCD problem
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... -
I just turned off Instant On option in Eng menu, now TV is working ok -
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?Leave a comment:
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Somehow I UI of this TV is very slow, do you guys have a same feeling?Leave a comment:
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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....
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tried resistance from 1Mo to 0, no luckLeave a comment:
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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 -
I tried that, works as expected, tried resistance from 0-50Kohm, do you think it may need some higher resistance?...
Last edited by xfox; 12-20-2023, 08:49 PM.Leave a comment:
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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...Last edited by xfox; 12-20-2023, 03:31 PM.Leave a comment:
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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 )Leave a comment:
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Re: Samsung smart tv bad power board BN44-0503A
ok, so with pull up resistor voltage is 12.75 13.3 and 13.4Leave a comment:
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Re: Samsung smart tv bad power board BN44-0503A
[ATTACH]239450[/ATTACH]
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
[ATTACH]239450[/ATTACH]
Voltage on picture, so it's switching from one to another, looks like main board is trying to reset itself...Leave a comment:
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Re: Samsung smart tv bad power board BN44-0503A
Oh, sorry... So voltage is 13.25V without main board connected and switching from 13.25 to 19v with main boardLast edited by xfox; 06-22-2021, 01:12 PM.Leave a comment:
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Re: Samsung smart tv bad power board BN44-0503A
Marked ground on attached photo with blue
[ATTACH]239380[/ATTACH]...Leave a comment:
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Re: Samsung smart tv bad power board BN44-0503A
Tried disconnecting, same measurementsLeave a comment:
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Re: Samsung smart tv bad power board BN44-0503A
CP814S - 163v
CS805 - switching from 14v to around 19.5v
QS801 - same as CP814 163vLeave a comment:
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Re: Samsung smart tv bad power board BN44-0503A
Nothing on main capacitor, all looks okLeave a comment:
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Re: Samsung smart tv bad power board BN44-0503A
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)
ICP801S - not sure how to check
PIN6 - PIN7...Leave a comment:
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