BN44-00301a

[carpamus]

Please upload BN44-00301A (or IE37F1_9HS, Hansol reference) to solve a problem. All voltages are correct only 5V_Det is 1.8 or 0V.
Thanks in advance

[Taneli.H]

Re: BN44-00301a

I have Samsumg LE37B535P7W with BN44-00301A.

And the problem is the same in thread:
https://www.badcaps.net/forum/showthread.php?t=44792
= Backlight does strobe-effect or doesn't turn on at all somedays.

I already chanced the two large 450V electrolytic capacitors to new ones.
Problem was gone for 1 day.

I think I need to chance diodes or ICs.
I'm newbie at these things, but I'dd like to learn these things too

Thank you, hope somebody can help me to find the answer.

[Taneli.H]

Re: BN44-00301a

I uploaded picture from the board.

[Nikolasch]

Re: BN44-00301a

Hi,
I'm facing the same problem with an LE37B530 at the PCB BN44-00301A.
Problem: when it turns on the welcome sound is heard, but no backlight nor a picture. Intermittently the TV turns on and runs normally for hours.
I suspect the switchmode power supply at the hot side. As I measure the voltage across the two caps 82uF/450V only at 315V.
+5V, and +13V are present as well as the SB voltage.

I read a lot of posts in here, but I could not find any conclusion of the problem.
Has anyone a tip what the problem may cause?

Or a circuit diagram would be most helpful.

Thanks in advance
Olaf

[budm]

Re: BN44-00301a

Hi,
I'm facing the same problem with an LE37B530 at the PCB BN44-00301A.
Problem: when it turns on the welcome sound is heard, but no backlight nor a picture. Intermittently the TV turns on and runs normally for hours.
I suspect the switchmode power supply at the hot side. As I measure the voltage across the two caps 82uF/450V only at 315V.
+5V, and +13V are present as well as the SB voltage.

I read a lot of posts in here, but I could not find any conclusion of the problem.
Has anyone a tip what the problem may cause?

Or a circuit diagram would be most helpful.

Thanks in advance
Olaf

The PFC Voltage booster circuit is not working, we need good clear pictures of the bottom side of the board to locate the PFC Controller IC to check to see if it has VCC to run IC.

[Nikolasch]

Re: BN44-00301a

Thanks for you reply,
I hope the picture will show what you're asking for.
If you need any other information, pls let me know.

cheers
Olaf

[selldoor]

Re: BN44-00301a

Budm wants a good clear picture of the other side of the board

[Nikolasch]

Re: BN44-00301a

OK, there you are.

Cheers
Olaf

[budm]

Re: BN44-00301a

We need the P/N of that PFC Controller IC.

[Nikolasch]

Re: BN44-00301a

Hi,
the device is ICP 801 and it read EK17 FAN7530.

Is there any circuit diagram of the PCB available?

Cheers
Olaf

[budm]

Re: BN44-00301a

Hi,
the device is ICP 801 and it read EK17 FAN7530.

Is there any circuit diagram of the PCB available?

Cheers
Olaf

OK, I forget to ask you to check PFC Diode DP801 to make sure it does not conduct in both direction or not, if it is tested OK then check the DCV for the PFC IC.
I do not have the diagram. Look up the spec sheet of the FAN7530, then check the DCV between VCC and the GND pin when TV is turned on to see if it its getting any DCV to run.
You will be working in the primary deadly side of the circuit so do not touch anything with your hands or body, you should plug the unit into the GFCI outlet for protection.

[vinceroger69]

Re: BN44-00301a

http://www.datasheetdir.com/FAN7530+...or-Controllers

[budm]

Re: BN44-00301a

Pdf fan7530.pdf

[Nikolasch]

Re: BN44-00301a

Hi,
thanks, I got the data sheet and I measured the VCC OK with 13VDC between pin 6 (GND) and 8 (VCC). I suspect the reference at the internal zener diode (pin 5) not alike 6.5V but 0.7V.

The diode measures OK.

Any idea to that? Right now that bastard shows a nice picture.
I think to replace the FAN 7530.
Does anyone have reliable source to buy?

Cheers
Olaf

[budm]

Re: BN44-00301a

Hi,
thanks, I got the data sheet and I measured the VCC OK with 13VDC between pin 6 (GND) and 8 (VCC). I suspect the reference at the internal zener diode (pin 5) not alike 6.5V but 0.7V.

The diode measures OK.

Any idea to that? Right now that bastard shows a nice picture.
I think to replace the FAN 7530.
Does anyone have reliable source to buy?

Cheers
Olaf

Are you sure you are not getting around 400VDC measured between the two legs of the main filter cap? The Inverter circuit needs that boosted Voltage to function, at 315VDC as you reported the protection circuit will kick in and not allow the backlights inverter circuit to come on.

[Nikolasch]

Re: BN44-00301a

As I sayed, it is working right now. I tried several times turning on and off.

The boster voltage at the 82uF cap measures 392V.

nice weekend
Olaf

[mkaleu]

Re: BN44-00301a

As I sayed, it is working right now. I tried several times turning on and off.

The boster voltage at the 82uF cap measures 392V.

nice weekend
Olaf

Hello Nikolasch,

would you please post the shematic or a link of the Board? I have the same problem.

Regards Mike

[Regata]

Re: BN44-00301a

Hi mkaleu!! I have a problem with this board, i have a bad capacitor, i need to know the value o cp819. Can you tell me this info?

Regards mkaleu

[budm]

Re: BN44-00301a

Hi mkaleu!! I have a problem with this board, i have a bad capacitor, i need to know the value o cp819. Can you tell me this info?

Regards mkaleu

Can you provide closed up pictures of this area where the cap is?

[darkyuver]

Re: BN44-00301a

Hi all, me to have a Power Supply with burned CP819. Can help me to! Can anyone give me the exact value?

The cap is located near a mosfet 14NM65N in position QP801 and near white trafo LP801

Help me thanks
Dario