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Equipment Repairs => LCD TV forum => Topic started by: Geoff S on June 08, 2012,07:28:59

Title: LE40C530F1W Again!!
Post by: Geoff S on June 08, 2012,07:28:59

Samsung LE40C530F1W

Ok. This set has come back again!  :33: It's returned to the original problem of switching on and off randomly.
Any thoughts anyone?

Thanks
Geoff

Title: Re: LE40C530F1W Again!!
Post by: grobinso on June 08, 2012,09:32:33

Hi, what's the PSU power board number (BN number)

I have had problems with one particular board switching the set off at random (such as when a high wattage device like a kettle) was switched  on/off on the same power line. It was a problem in the PFC circuit.
Let me have the BN number & i will check if it's the same board.

Regards

Graham

Title: Re: LE40C530F1W Again!!
Post by: Geoff S on June 12, 2012,07:52:21

Quote from: grobinso on June 08, 2012,09:32:33

Hi, what's the PSU power board number (BN number)

I have had problems with one particular board switching the set off at random (such as when a high wattage device like a kettle) was switched  on/off on the same power line. It was a problem in the PFC circuit.
Let me have the BN number & i will check if it's the same board.

Regards

Graham

Hi Graham
Ok the psu is a BN44-00340

Ring any bells?
G

Title: Re: LE40C530F1W Again!!
Post by: grobinso on June 12, 2012,16:24:21

The number is pretty close, mine was a BN-00339B & from the diagram it seems simiilar. The PSU i had would initially work ok, then randomly the set would switch off & sometimes not switch back on again straight away, particularaly if something like a hairdryer or Kettle was switched on .You had to leave it a while before it would come back on & it was'nt down to the secondary caps as usual as i had changed them.

I checked the vootage across the main smoothing cap (the large brown one) & the HT was only 328v.DC, i checked on good board & it was 378 V.DC so i believe its a fault in the PFC circuit which is controlled by a small chip  (FAN7530) in position ref ICP801 on my board.  I haven't had the time to check it out yet but first thing i will try will be that chip (only about £3 on Ebay).

Check your main DC HT voltage as above & see if it's low


Graham

Title: Re: LE40C530F1W Again!!
Post by: fix2003 on June 13, 2012,02:36:46

try these

Title: Re: LE40C530F1W Again!!
Post by: Geoff S on June 15, 2012,12:46:40

Ok thanks fellas

All checks made and no voltage probs. I decided to pull the IR sensor board to see if that was causing trouble.... sure enough the set runs fine with it out.

Question: Anyone got a BN41-01382A control/IR board? !!!  :17:

Geoff

Title: Re: LE40C530F1W Again!!
Post by: WILLYAM1 on June 18, 2012,05:16:54

most of this problem is the buttons.
take out the cable  and check the tv if it works ok change all buttons.
if not problem is in main board.
willyam1