Re: Samsung Le40C550J1WXXC Backlight
Hello momaka.
No this power supply does not have rellays on it.
Not sure where this 5v should be generated..... I have tried to compare several components by checking both boards but cant find any diferences.
Give me your tv part number and I can check in my database where is your problem.
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Re: Samsung Le40C550J1WXXC Backlight
No joy with the transformers.
Checked and compared the voltages of both boards and all are the same, even the 380v boost on the caps.
The only diference is the 5v detect that is at 0v at pin2 of the CN802 connector.
On the good board the 5v are present
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Re: Samsung Backligth
Hi,
Just received another Samsung but with same power supply.
Changed it and problem is on the power supply.
I have allready changed from one board to the other ICP801 / UI801 / UI805 and problem still presists in the defective board.
I will change the 2 big inverter transformers.... lets see if it works
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Re: Samsung Backligth
Understood.
Fuse is OK
But there is no backligth even for a split second.
And Sansungs should lit up the backligth if the main is disconnected.... not this one.Last edited by nezocas; 10-24-2023, 09:14 AM.
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Re: Samsung Backligth
Hello,
Image is present, tcon as got the 12v present, image is not so easy to see in this ccfl lcd´s.... its easy to see in led´s sets.
Here goes the voltages:
1- 12.95
2- 0
3- 12.95
4- 4.49
5- 12.95
6- 2.08
7- 0
8- 1.78
9- 0
10- 0
11- 5.25
12- 0
13- 5.25
14- 5.25
15- 12.95
16- 5.26
17- 12.95
18- 2.11
18 PS-on
16 A5v
15/17 B13v
11/13/14 B5v
9/10/12 Gnd
8 H_Sync
6 E-Pwm
4 BL-on...
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Samsung Le40C550J1WXXC Backlight
Hello,
I am strouglling with this TV.
Model: Le40C550J1WXXC and inverter and power suplly BN-4400340B
It boots up normally, but no backligth.
I have check the PFC resistors from 814 to 818 and resolder all of them, I get 380Vdc on the 100uf 450v caps.
I have checked DP803 / ZDM806 / QM801 / ZI802 / QP801 802 / QI801 803
Replaced IPC801 fan7530
All solder joints were checked and also the electrolitics for capacitance and ESR.
I am lost, can someone help me with this issue.
Best regards
Nezoca...
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Re: Tv Grundig Vision 2 22-2920 turn off after 2 secs
SOLVED,
Received bad transformer, and it had good readings in the primary and secondary sides.
Replaced transformer from a scrap board. It was also a blue transformer from 17IPS15-4 power supply with diferent part number TMS93700CT.
Regards...Last edited by nezocas; 01-12-2023, 03:38 AM.
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Re: Tv Grundig Vision 2 22-2920 turn off after 2 secs
Hello,
I know this is an old thread.... but I have the same set, with same PSU.
Initially I had no backligth....just sound and image (visible with a powerfull torch).
I went strait to the transformer, one of the secondary winding was 1.8K the other was correct 1.3K.
Changed it with same part number, and still no backligth.
To avoid dissassembly the LCD to check the lamps, I plugged 4 laptop screens (old ones with lamp) to the tv. Only 2 will ligth up for 2 seconds.
...
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Re: Lg 32LB75
Hi,
Tv was scraped, to many hours to fix old tv.
Thanks
Regards
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Re: Lg 32LB75
Hello again,
All 14 CCFL tubes were tested individually with my tester.
On the Q707 there is only 18v, it should be 24v from what I have read online.
But I have no schematic from this PSU.
I have followed this topic, but the fault is not the same, I dont even get a blink from the tubes:
[url]https://www.badcaps.net/forum/showthread.php?t=37829[/url]Re: Lg 32LB75<br /> <br /> Hello a... 24v from what
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Lg 32LB75
Hello,
Tv not starting correctelly... goes out of standby with green led and back to standby.
PSU: EAY38639701
All caps in PSU were ESR and capacitance tested, inclunding the problematic ones on the mainboard C227/543/958/853/959/970.
PFC is 395Vdc
If I bypass the ERROR pin in the plug 201 and connect it with a 100homs resistor to the 5v rail, Tv work´s with sound but no backligth present.
All voltages on p201 present with the bypass.
Not sure what to do...???
Regards
NezocasLast edited by nezocas; 01-03-2022, 05:14 AM.
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Re: Le32b530p7xxc
Hi,
As stated in my first post, the transformers winding were tested, out of circuit.....Now I dessoldered them again to write values.... didnt find much diferences between them:
1º transformer:
Primary 12.35R
1º secondary 828R
2º secondary 830R
2º transformer
Primary 12.35R
1º secondary 841R
2º secondary 841R
Not sure if this diference will make any change....
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Le32b530p7xxc
Hi,
Need some help,
Tv boots up with Samsung startup sound, I have visible image in the back ground with flasligth and also sound, But NO backligth.
On the CN801 connector from the BN44-00261B all voltages are present:
Pin 1: OFF 0v. Out of standby 1.55v
pin 3: 5.24v
pin 7,8: 13v
pin 13,16: 5.2v
pin 19: 13v
pin 21,22: 13v
pin 23: 4.46v
pin 25: 2.15v
pin 27: 0v
I have tested:
DI823 DI811 and DI810
Got both transformers out and their are 5homs apart in all the secondary...
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Re: Toshiba 49U6763DG
But dont have any image on LCD...
And also no files needed to update.
Now I do (thanks)....but I will make a backup of both IC´s before usb update.
Regards...Last edited by nezocas; 01-16-2021, 09:30 AM.
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Toshiba 49U6763DG
Hi,
Need dump for this display:
VES490QNDS-2D-U11
Set boots fine, I have sound and back ligth, but no image.
12vdc are present on the lcd bonded boards.
Main board is: 17MB120 with both U11 and U13.
I have Minipro TL866 (and others) to program the 25L1606 flash ic´s
Regards
Nezocas
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Re: Samsung LE46C530
Yes my AC is 230v
As you guys asked, when I was checking all diodes, found DP807 (next to FAN ic) shorted in circuit, dessoldered it and it was good outside, next dessoldered CP810 it was good also....I thinked to my self, this "short" is caused by a parallel low value resistor.
Let´s check the standby voltage at main cap as you guy´s asked.
To my surprise the backligth came ON.
I only think one cause to this, the glue under one of those components, causing parasitic readings and forcing...Last edited by nezocas; 01-21-2019, 04:50 AM.
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