Samsung tv dosent turn on (no signal/standby light out) after lightning hit the house

[selldoor]

Re: Samsung tv dosent turn on (no signal/standby light out) after lightning hit the h

Hah! I was hoping you would label some other but the pic is better so i can see the board numbers
So QM854 QM855 Both bottom left - the top one looks a bit burnt - is it just the photo? Q9162 (bottom Right) I think these are mosfets can you read the part numbers on any of them.
If they are you can test them for shorts -
Mosfets

If you have a manual range multimeter, set it to 200 ohms (two hundred). This is for 3 pin ICs only. You can test a mosfet (Q, IC designation) "in circuit" by (power off and unplugged)

a) black on pin 1- red on pin 2 - record ohms
b) black on pin 1- red on pin 3 - record ohms
c) black on pin 2- red on pin 3 - record ohms

If any reading is less than 30 ohms you might have shorted mosfet. Remove from circuit and repeat the tests to verify.

While you were away we had a similar case - did many tests and it ended up as faulty solder joints!!

[adaugaard]

Re: Samsung tv dosent turn on (no signal/standby light out) after lightning hit the h

Hah! I was hoping you would label some other but the pic is better so i can see the board numbers
So QM854 QM855 Both bottom left - the top one looks a bit burnt - is it just the photo? Q9162 (bottom Right) I think these are mosfets can you read the part numbers on any of them.
If they are you can test them for shorts -
Mosfets

If you have a manual range multimeter, set it to 200 ohms (two hundred). This is for 3 pin ICs only. You can test a mosfet (Q, IC designation) "in circuit" by (power off and unplugged)

a) black on pin 1- red on pin 2 - record ohms
b) black on pin 1- red on pin 3 - record ohms
c) black on pin 2- red on pin 3 - record ohms

If any reading is less than 30 ohms you might have shorted mosfet. Remove from circuit and repeat the tests to verify.

While you were away we had a similar case - did many tests and it ended up as faulty solder joints!!

Hey thanx. Hmm unless my cheap multimeter is to "off" its reads constant 1 on all legs of all these 3 components. I have the 200ohm on the meter - just took a picture of it - a bit unsharp i know my macro photolens is a bit hard to control or it can be my 35 years old eyes - no comments

Alle 3 had the middle leg with no connection - se the photo mosfet example

The top QM854 dosent look burned actually
Its named
D4184
looks like there is no number below this

QM855 is named
D4185
BA1G1Z


Q9162 is named
MDD5N40
C7384CGG (the last CGG is hard to read - can also be GGG or CCC)

[selldoor]

Re: Samsung tv dosent turn on (no signal/standby light out) after lightning hit the h

OK 0 they are all mosfets and seem to be ok - at least not shorted.

[selldoor]

Re: Samsung tv dosent turn on (no signal/standby light out) after lightning hit the h

Hey just messured nr 21 - it dosent give any response on VDC200.
The meter switches around 0.00 and 0.01. Power is on and fuze is still ok.
Could this be the "bad" component we are searching fore ?

I will make a better picture of the back with numbers.

Missed this post - sorry - no I dont think it is bad it is just not getting power
to it. I will try to think of something else to test

What is the part number on IC9101 back of the board 16 legs below 27 in your picture.

[adaugaard]

Re: Samsung tv dosent turn on (no signal/standby light out) after lightning hit the h

Missed this post - sorry - no I dont think it is bad it is just not getting power
to it. I will try to think of something else to test

What is the part number on IC9101 back of the board 16 legs below 27 in your picture.

Its
SEM5025
1121

just set numbers and letters on the legs if there is anything i maybe need to messure on that

[selldoor]

Re: Samsung tv dosent turn on (no signal/standby light out) after lightning hit the h

I am struggling to find a datasheet for the Samsung SEM5025 maybe it has not been released/leaked yet. Nearest I can find is SEM2005 but looks to me it may be for a non LED set. If no-one else can help may have to resort to hoping the pins are the same - if not the values.

[adaugaard]

Re: Samsung tv dosent turn on (no signal/standby light out) after lightning hit the h

I am struggling to find a datasheet for the Samsung SEM5025 maybe it has not been released/leaked yet. Nearest I can find is SEM2005 but looks to me it may be for a non LED set. If no-one else can help may have to resort to hoping the pins are the same - if not the values.

Hey yes I searched google to cant find any.
I searched for the whole powerboard at shopjimmy but the current board is out of stock - that would be a easy solution - though the prices shifts alot.
And ofcorse its a little stupid if its only one part that is burned, but yes depends if it to difficult to find or it maybe is other issues like the leds etc can see others on the forum having problems with that

http://www.shopjimmy.com/samsung-bn4...upply-unit.htm

dont know if others are selling those boards- do you?

[selldoor]

Re: Samsung tv dosent turn on (no signal/standby light out) after lightning hit the h

No-one else eh!

Well just go for it power up the board and Set you meter on VDC600 to start with and just test each pin on the SEM5025 with respect to ground.
Dont bother writing them down - just do a quick test to see if there are ANY
voltages. If there are then change the vdc scale to the one above and test again and post result. Look up the datasheet for the SEM2005.
There are still lots of things to test to try and pin down where the voltage stops - What is the part number on the BIG transformer (7). You could also test for voltages on all the capacitors - (28, 36-39 )you can get an idea of what the Max should be by the voltage on them. For example if it says 16v 1000uf you need to be on 20vdc scale if there are any 35v caps you need to change to 200vDC scale.
I dont know where you might get a board - maybe a whole tv with a broken screen on ebay.. In the UK there is flattvparts you could check out.