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Old 6th August 2012, 07:42 PM   #11
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There's only one rectifier on each side (CR1 and CR2).
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Old 10th August 2012, 08:02 PM   #12
bitpoop is offline bitpoop  United States
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for the gate resistor, 48 ohm's.
is this ok? thin film.
irf 9540 are on backorder.
Mouser Part #: 279-RN73C2A48R7BTDF
Manufacturer Part #:
RN73C2A48R7BTDF
Manufacturer:
TE Connectivity
Description: Thin Film Resistors RN 0805 48R7 0.1% 10PPM 1K RL
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Old 10th August 2012, 08:58 PM   #13
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Digikey has the 9540s. They also have the 47 ohm resistors:
P47ACT-ND

Did you check all of the 12 ohm gate resistors also?
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Old 11th August 2012, 07:53 PM   #14
bitpoop is offline bitpoop  United States
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r142,r150,r152 & r242,r250,r252 all read 12.3 ohm's
gate at voltage regulator Lm337 and Lm337sp = r25,r26,r27 I get no readings R28=117 ohm's.
I was testing random resistors and some of them I get no reading.
not sure if i am making contact with the metal.
sometimes the meter flashes a reading for a split sec. then goes n/a?
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Old 11th August 2012, 10:03 PM   #15
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Is your meter auto-ranging?
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Old 12th August 2012, 08:24 PM   #16
bitpoop is offline bitpoop  United States
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I am using a cheap harbor freight cen-tech 7 function digital multimeter.
it has 5 ohm settings from 200 to 2000k. its set at 200 ohm's
I do have an old fluke meter from the 80's in the garage I could use, the cen tech is a lot easier to use do to size.
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Old 12th August 2012, 11:11 PM   #17
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Some resistor values will be much greater than 200 ohms. If your meter isn't auto-ranging, you have to change the setting to read the value of the resistors.

Reading the resistors in the board is not going to give accurate readings for higher value resistors. If a resistor looks like it has overheated, it needs to be checked, otherwise it's likely OK.
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Old 17th August 2012, 02:47 AM   #18
bitpoop is offline bitpoop  United States
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ok I pulled out my fluke 73 meter and this changes everything.
I now get ohm readings from all the chips.
on the 5NO5HD chip I get 4 ohm's on legs 1 and 3 is that to low?
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Old 17th August 2012, 03:23 AM   #19
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That's too low.

MTP75N05HD
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Old 21st August 2012, 10:37 PM   #20
bitpoop is offline bitpoop  United States
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new meter = R26= 219 OHM'S, R28=240 OHM'S
R25= 1089 OHM'S, R27= 120.5 OHM'S
it looks like r25 with 1089 ohm's is bad.
I don't understand how a peace of nickel alloy fails.
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