Re: Samsung / Hansol BN44-00428b
Last LED had bad connection. I can't remove the led strip as screws were small and tight. i can't risk damaging the screws again and drill it. So just added more more solder. it was tricky as space was very tight. But anyway worked and didn't damage LED. I hope the solder holds LED in place and good connection.
r_arun_03
Member
Last Activity: 12-02-2019, 02:50 PM
Joined: 11-15-2019
Location: Cheshire
-
Re: Samsung / Hansol BN44-00428b
Finally i fixed my TV today and it is working fine for now. Thanks for your helpLeave a comment:
-
Re: Samsung / Hansol BN44-00428b
Hopefully just having hard time with removing screws. there are so many and heads getting damaged easily
. atleast so far 5 screws had the problem then ended up drilling . hopefully soon will be able reach back light leds
Leave a comment:
-
Re: Samsung / Hansol BN44-00428b
After removing the main board connection to power supply and tried connecting A5v to PWM_dim1, PWM_dim2, PWM_dim3 and PWM_dim4 in cnm801 one by one. Except PWM_DIM1(top most back light LED strip) all other back light strips worked.
Then checked voltage on all pins(R1+/-, R2+/-, L2+/- and L1+/-) for PWM_DIM1. Only L1- (pin7 in CNL801A) read 0V. So it looks like problem could be open/short circuit in top most back light LED strip.
As tv works fine when tv is hold at an angle i assume that LED is fine, just there could be short...Leave a comment:
-
Re: Samsung / Hansol BN44-00428b
Went through this link [url]https://tvrepairdepot.com/samsung-d7000-series-led-tv-power-supply-and-backlight-failures-troubleshooting/[/url] to understand how power display works.
Blu_on/of is for back light on/off
one of the capcitor feeding a led channel has an anamoly
screen-logo on - off - tv working(in VDC)
c9259- >230 -130 -183 looks wrong
c9359-170 -130 -183
c9159-170 -130 -183
c9459-170 -130 -183Re: Samsung / Hansol BN44-00428b<br ...hooting/[/url]Last edited by r_arun_03; 11-17-2019, 10:06 AM.Leave a comment:
-
Re: Samsung / Hansol BN44-00428b
In ON/OFF mode
cnm801 pins to main board
pin
1 - 1.9
2 - 2v on clicking on/off .8v when tv working when kept in an angle
3 - 3.2
4- 2v on clicking on/off .8v when tv working when kept in an angle
5 - 0
6- 2v on clicking on/off .8v when tv working when kept in an angle
7 - 12.8
8- 2v on clicking on/off .8v when tv working when kept in an angle
9 -12.8
10 -12.8
11-18
12- 1.3 to 3v when clicking. 4.6v when tv working
13-18
14-0...Leave a comment:
-
Re: Samsung / Hansol BN44-00428b
On stand by no clicking and everything seems to be fine.Leave a comment:
-
Re: Samsung / Hansol BN44-00428b
Whwn i measured voltage for TM801s as shown in picture(with blue arrows) it is reaching 1700 to 1800v(flutuates lot as it is clicking) and going back to 0 as it clicks. Not sure if it is the desired voltage. Pls let me know if it is desired.
Power supply clicks only when main board(cnm801) is connected (even without led pins(cnl801a and cnl801b) connected)....Last edited by r_arun_03; 11-16-2019, 04:18 PM.Leave a comment:
-
Re: Samsung / Hansol BN44-00428b
Thanks for the reply. Unfortunately i didn't take a picture and already resoldered it. But still no luck..Leave a comment:
-
Re: Samsung / Hansol BN44-00428b
Hi All,
Tv model:ue55d7000. Has power supply BN44-00428b. Intially problem started with restarts in between. But later got worse with automatically switching on/off before staying on for more than a hour. Last week it indefinitely went in boot loop.
Took the back cover off. Smart logo keeps appearing on on/off. Backlight flashes 95% of the times.
Weird thing is when I hold TV at an angle to the floor, it starts normally but goes in boot loop if i change the angle. So thinking some connection issue rather than...Leave a comment:
No activity results to display
Leave a comment: