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LE40C530F1W Again!!

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Geoff S:
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

grobinso:
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

Geoff S:

--- 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

--- End quote ---
Hi Graham
Ok the psu is a BN44-00340

Ring any bells?
G

grobinso:
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

fix2003:
try these

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