Another Samsung power/inverter board BN44-00264B Rev1

[jurgyman]

So I have a Samsung LN40B630N1FXZA made in 2009

Its power and inverter board is all in one:
model: H40F1_9DY
CodeNO: BN44-00264B
PCB REV: Rev 1.0
Date: 08.12.08

Symptoms:
Tv Has standby power.
Tv will power on, can hear startup chimes.
may see backlight flash on then off.
if fresh fuse is in, it will fry.
Frying fuse is in FI801S

Caps all look fine.
I have tested components in circuit.
They all look good except for:
- QI804 FET is shorted (says on it: K3568 8:m)
- Di806 diode is shorted (says on it: SSF)
- FI801S fuse will burn, as mentioned (says: T3.15A/250V)

So am looking for the schematic of this board.
to identify those components...
To potentially buy (where and how?)

Also I suspect one of my backlights is out/bad/shorted.
Is there a way to disable the protection circuit on the bad one.
Is there a way to deduce which is the bad one?
Not really wanting to take it apart all the way to the backlights...

See my attachments.
thanks in advance!
JurgyMan

[dick_barton]

Re: Another Samsung power/inverter board BN44-00264B Rev1

Looks like the inverter transformers are a problem on these boards
https://www.badcaps.net/forum/showth...ht=bn44-00264b

[jurgyman]

Re: Another Samsung power/inverter board BN44-00264B Rev1

How does one test a transformer with your typical digital multi-meter...

Anyone any suggestions on howto to identify the parts that tested bad?

[dick_barton]

Re: Another Samsung power/inverter board BN44-00264B Rev1

How does one test a transformer with your typical digital multi-meter...

Set your meter to ohms. Primary windings are probably low resistance of just a few ohms and secondary resistance of 1K - 2K.
Compare the readings you get off each transformer and see if any of the readings do not match the others.

[doughala]

Re: Another Samsung power/inverter board BN44-00264B Rev1

I am looking for the capacitors for cp801 and cp803 value and parts plus power board fuse
BN44-00264B / H40F1_9DY board

[doughala]

BN44-00264B Rev1

I am looking for the capacitors for cp801 and cp803 value and parts plus power board fuse
BN44-00264B / H40F1_9DY board

[R_J]

Re: Another Samsung power/inverter board BN44-00264B Rev1

The values are marked on the caps, (likely 82 uf/450v) the fuse value is marked on the board. (there is more than one fuse)

[Andrew F. Ali]

Re: Another Samsung power/inverter board BN44-00264B Rev1

the values are marked on the caps, (likely 82 uf/450v) the fuse value is marked on the board. (there is more than one fuse)

+10