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Samsung LE40M86BD Not Caps/Flash?

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jordan:
bn44-00165A.

CraXyOW3:
The shunt regulators showed good values and no shorts, altho i diode checked the optocouplers in the vicinity and PC802S is showing double the value as the other two PC801S, PC803S, might that optocoupler be defective then?

dynomo:

--- Quote from: CraXyOW3 on February 27, 2013,13:35:35 ---The shunt regulators showed good values and no shorts, altho i diode checked the optocouplers in the vicinity and PC802S is showing double the value as the other two PC801S, PC803S, might that optocoupler be defective then?

--- End quote ---

Just pulled a psu out my parts bin. PC802s is reading higher on this board in situ if that helps. Check fuse FW802. Had one once where this fuse had blown along with IC UB801S and diode ZB802.

Other pain in the ass faults I have had with these PSU's is the variable resistor VR801 going bad causing the 2 fets M1801S and M1802S to go short circuit. But that normally duffs the backlight inverter only on the PSU.

I would lean towards the eeprom myself on your set.

CraXyOW3:
FM802 fuse checks out ok, same with FM801, diode ZB802 passes the diode test tho i get .04 v when powerd.
VR801 is measuring 16k and i got no shorts on MI801S/MI802S

DB801 is a bit dubious for me, i get the ok with the diode test with my dmm, but when measuring the voltage it only spikes, i can't read it.

The transformer noise is still there too, could it be plausible for the transformer to make that "whizzing" noise due to the memory flash?


EDIT:
Have orderd the flash memory. But still, what is it with the transformer?

Keith:
Hi,

You need to force the power supply on to test if it is working.

Keith

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