samsung tv (power problem)

[zezo]

i have problem with Samsung TV model la32b350f1.

the power supply board no out put but the 300vdc on the big cap are Existing and on the mosfet and chopper transformer . all primary side voltage are Existing .
after chopper transformer no power while the diode Official 5vdc and 12 right .
i replaced ic ICE3BR0665J but no power . please help me


thanks for all

[PowerAmpFreak]

Re: samsung (power problem) model la32b350f1

i have problem with Samsung TV model la32b350f1.

the power supply board no out put but the 300vdc on the big cap are Existing and on the mosfet and chopper transformer . all primary side voltage are Existing .
after chopper transformer no power while the diode Official 5vdc and 12 right .
i replaced ic ICE3BR0665J but no power . please help me


thanks for all

The ICE3BR0665J is far as I remember the controller for standby voltages. Do you have a red led on in standby mode?

[zezo]

Re: samsung (power problem) model la32b350f1

The ICE3BR0665J is far as I remember the controller for standby voltages. Do you have a red led on in standby mode?

no power on. no red led.
please help me

[selldoor]

Re: samsung tv (power problem)

Welcome to the forum-
We can sometimes help a lot more if you please post good clear pictures of the whole chassis, and then pictures of each board, front and back (in the same orientation) and close up of connectors, (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply.

Please do not post inline and offsite as they slow down the loading of pages.

Examples of what is needed

https://www.badcaps.net/forum/attach...7&d=1280167246

https://www.badcaps.net/forum/attach...6&d=1280167246

https://www.badcaps.net/forum/attach...4&d=1280167246

[zezo]

Re: samsung tv (power problem)

Welcome to the forum-
We can sometimes help a lot more if you please post good clear pictures of the whole chassis, and then pictures of each board, front and back (in the same orientation) and close up of connectors, (max resolution 2000x2000 and 2MB) using the manage attachments button, which is found by clicking "go advanced" under quick reply.

Please do not post inline and offsite as they slow down the loading of pages.

Examples of what is needed

https://www.badcaps.net/forum/attach...7&d=1280167246

https://www.badcaps.net/forum/attach...6&d=1280167246

https://www.badcaps.net/forum/attach...4&d=1280167246

thanks. selldoor i well upload photo

[selldoor]

Re: samsung tv (power problem)

Not our usual picture problem - too much light - or dark But thats Egypt for you extra bright sun and dark shadow. Can you post the part number of the board BN44-002????

[selldoor]

Re: samsung tv (power problem)

There are two small startup caps on the primary side can you post their value and can you check the voltage on them.

[zezo]

Re: samsung tv (power problem)

Not our usual picture problem - too much light - or dark But thats Egypt for you extra bright sun and dark shadow. Can you post the part number of the board BN44-002????

part number of the board BN44-00289B

[zezo]

Re: samsung tv (power problem)

There are two small startup caps on the primary side can you post their value and can you check the voltage on them.

caps value 22u/50v quantity 1
47u/50v quantity 2

[selldoor]

Re: samsung tv (power problem)

At some point can you check the voltage on them.

Have you read this thread and done the tests mentioned is your 2A fuse ok
https://www.badcaps.net/forum/showthread.php?t=20463

[budm]

Re: samsung tv (power problem)

Sorry, but you should not start another tread:
https://www.badcaps.net/forum/showth...175#post297175

[selldoor]

Re: samsung tv (power problem)

Sorry, but you should not start another tread:
https://www.badcaps.net/forum/showth...175#post297175

Hmm didnt spot that - may as well continue on here as it has some pics and the schematic and let the other one die

[budm]

Re: samsung tv (power problem)

OK, I will follow this one, mean while I will at the SCH.

[PowerAmpFreak]

Re: samsung tv (power problem)

The ICE3BR0665J has an internal start-up current generator which takes current from the Drainpin and charges CM808. At a certain point, oscillation will start and continous supplycurrent is supplied through aux winding pin 5 on transformer. So, please verify CM808 does charge and tell what voltage you see.

[budm]

Re: samsung tv (power problem)

You may want to read this:
https://www.badcaps.net/forum/showth...ht=ln32b360c5d

[zezo]

Re: samsung tv (power problem)

thanks every body
i found zd 804 with part number 1n4740 zener 10vdc
it leaked has two reading with digital meter
i changed it and the power board is ok

[budm]

Re: samsung tv (power problem)

Great, thanks for the repair feedback.

[alfreire]

Re: samsung tv (power problem)

Hi... I found another fault for 300v in CP815, some resistor (SMD 1,2M conected to fuse 2A FB802S) of RB803, RB804, RB805 and RB806 (in special RB806) have low resistance due to conduction of glue. Remove resistor, clean glue and resolder again...
I found this problem in others power supplies of other models in the same circuit...
Regards... ;-)

p.d.: sorry for my bad english... X-D

[Aco]

Re: samsung tv (power problem)

Problem with Samsung TV model lE32B350F1.

At the start, the red LED flashes four times and then nothing happens, there is no picture.

Initially I found that it was destroyed: FS801S fuse, rectifier SD801S, FET QP802S (ICE3BR0665J) and elko CP815. After replacing PFC works ok, it have 380Vdc, UM801S works as there are 5Vdc and 13Vdc. When you start up a sound sounds, the red LED flashes 4 times and nothing is happening anymore, there is no picture. The oscilloscope shows that it does not oscillate QI820, QI821, and there is no escape from DT801S.Practically there are no 800Vac.Unfortunately I do not have the scheme of the whole TV only on the part BN44-00289. I ask for some help, suggestion, an idea what further.

Thank you very much

[budm]

Re: samsung tv (power problem)

Start a new thread with make and model + good clear pictures of the whole backside of the TV showing all the boards.