Closer pic of PSU? Does 5V come back when you pull the power to main board connector out? Any ticking/pulsing sound from power board?
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
No luck with the hair dryer. Did pull out both capacitors(100mF 35v & 10mF 100v),no shorts,charged them with ohmmeter and drain back with voltmeter idk.
No luck with SCH either, so resorted to fishing.
Did notice short across octo didn't seem right; lifted it it seem ok. There's a sot 6 pin IC in area no idea what it is???
Found N MOSFET (F2HNK60Z) seems shorted , will pull next...
All these components are associated with primary of low voltage transformer.
Blown FET can damage IC.
Replace IC, FET, and nearby resistors and diodes.
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
So I got off my butt and found my camera, iPad doesn't seem to be cutting it.
Got a pic of the afore mentioned residue, looked like something I saw in 'worst soldering' thread (somebody had a go at it already I think), but what a difference, been squinting through the magnifying glass and camera lens for too long now I can see discrete component markings and ICs way better than naked eye! Would like to get an inexpensive USB microscope/camera...
Anyways, trying to get a parts list together and dunno how to spec PWM controller -mentioned a FAN6862 or similar a while back but there seems lots to choose from and I don't know anything about cross compatibility...
Any suggestions? Pic at least show package marking if that's any help.
Decided since I didn't have a SCH I'd try my hand at drawing one...at least the part that seems bad.
So here goes, most of it seems to make sense...any feedback would be appreciated on the plausibility of the circuits I've tried to interpret.
Btw q9 is the bad/ shorted MOSFET and there are various resistors hi-lighted that look damage as well as no reading/OL.
Attached Files
Last edited by Fwrothy; 03-14-2014, 12:31 PM.
Reason: Add info
R80/R81 will likely be low ohms. Are they through hole? Completely unreadable?
R73: typically 2~3x R74 value non-critical
R74: around 22 to 56 ohms check IC2 datasheet
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
R80/R81 will likely be low ohms. Are they through hole? Completely unreadable?
R73: typically 2~3x R74 value non-critical
R74: around 22 to 56 ohms check IC2 datasheet
I think the last pic shows them, r80/81 look like 4 digits.
They are all SMDs... Biggest issue is I don't know what IC2 IS...just guessing by pin layout .
Looks like 2R20 i.e. 2.2 ohms which is about right.
Couldn't find any info on that IC either.
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.
Ya it's a bugger... There are a few in the Fairchild roster that seem like they could work but idk how pick or compatibility issues. It's a $40 psu and available, plus the trace is lifting a bit (probably my fault when re&re ec7)-just trying to challenge myself.
Thanks for the input appreciated as always
Better pic..
Comment