bought new Power Board, can't test Main Board - need help using MultiMeters

[triplefour]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

do the readings you got on the fuses match the readings you get when u just touch the probes together? if so, then your fuses are fine.

[GR3Y5H3ART]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

pretty close

Ohm multimeter set to: 2m
-.015

Ohm multimeter set to: 200k
-01.5

[GR3Y5H3ART]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

maybe i should remeasure the readings w/the Fluke multimeter since my first one had some funky readings due to it always resting at like -4 instead of at 0

[triplefour]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

couldnt hurt. on my meter, the resistance of the probes touching each other is 0.3 oms so if i get .4 or .5 i consider that a good fuse...not sure how much resistance is ok tho

[GR3Y5H3ART]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

measured with the Fluke:

1
Left Pin
1.27

Right Pin
3.28
1.28
.028

2
L
1.50

R
3.28
1.50
0

3
L
3.28

R
5.13
3.28
2.03

4
L
3.27

R
5.15
3.27
2.02

5
L
2.26

R
5.16
2.26
1.39

so 1 & 2 seem the same and 3 % 4 seem the same

is 5 bad?

[triplefour]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

sorry im totally lost as to what you are measuring. it helps to label things ohms or volts.. and um... explain yourself better? or maybe its late and this will all make sense in the morning

[GR3Y5H3ART]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

sorry im totally lost as to what you are measuring. it helps to label things ohms or volts.. and um... explain yourself better? or maybe its late and this will all make sense in the morning

volts

the readings for voltage regulator #1 and #2 are about the same numbers, same thing for #3 and #4.

#5 having different numbers than #1 - #4

[keeney123]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

You should not get a neg reading on the ohms setting. So to measure the fuse you need to set your meter to ohms on the lowest setting. That would be the setting closest to 0 ohms. Most likely 200 ohm setting. Or if your meter has auto-adjust it will do it for you. Then you make sure TV is unplugged. You take one probe and place it on one side of the fuse and the other probe place of the other side of fuse. The fuse should typically measure under 1 ohm.

[GR3Y5H3ART]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

remeasured and fluke beeped and went to 0 indicating both fuses are good

[GR3Y5H3ART]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

should i replace voltage regulator #5?

[budm]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

#1 : OK, 1.25vRef +.028 =1.278
3.28
1.28
.028

#2: 1.5V FIXED Regulator?, need to verify P/N
3.28
1.50
0

#3: OK, 1.25Vref + 2.03 = 3.28
5.13
3.28
2.03

#4: OK, 1.25V ref + 2.02 = 3.27
5.15
3.27
2.02

#5: BAD, 1.25Vref + 1.39 = 2.64, you are getting 2.26.
5.16
2.26
1.39

[triplefour]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

oh yeah. voltage regulators. well it would have helped to add those 2 words in there

[keeney123]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

I believe he said in the 10th post it was
K1117S15
726
is that not a good number?

[budm]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

I did not read all the lost, it is over 50 now. So it is 1.5V fixed regulator and it is OK.

[keeney123]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

Now it that a bad regulator of a bad capacitor attached to the regulator? Will a ac voltage reading give a reading of ripple?

[GR3Y5H3ART]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

#5: BAD, 1.25Vref + 1.39 = 2.64, you are getting 2.26.
5.16
2.26
1.39

good news in a sense?

will report back when the replacement is installed

should i grab readings for any of the caps around #5 voltage regulator

[triplefour]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

the #5 regulator looks like its getting its 5v just fine, its just broken so its not outputting the correct voltage. i dont think bad capacitors around there would cause this. you cant test much on caps beyond voltage and shorts with a simple meter. you cant test capacitors ESR without taking them out of circuit and having a meter that does that. id say just replace that regulator and see if it doesnt fix things

[keeney123]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

Or you could switch the meter to read AC volts that is if you have a millivolt setting on the meter for AC volts. Then measure the second pin on regulator number 5. I do not know the tolerance of the AC ripply for this regulator, but if it is over one percent of the reading I would suspect a capacitor. So one percent of the correct dc reading of 2.64 volts DC is 0.0264 Volts AC ripple or about 0.030 Volts AC ripple or 30 millivolts AC ripple

[GR3Y5H3ART]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

i tried my best at soldering the Voltage Regulators but they were way harder for me

bit the bullet and found a good deal for a working one for $40ish shipped

it WORKS!

now i have a Main Board (Voltage Regulators will most likely all need replacing and most likely is a non working board for parts) and a Power Supply for parts only since i tested soldering on it

i will gladly ship either of these to someone who can use them if you cover the shipping

thanks for everyone's help and only condition, Main Board is:

3642-0272-0150 (5A) if your Main Board is different in those numbers, they are not interchangeable

i.e. if your Main Board is 3642-0552-0150 (3E) or other varying numbers, it will not fit if your looking to directly replace but again, Board is probably only good for parts

[GR3Y5H3ART]

Re: bought new Power Board, can't test Main Board - need help using MultiMeters

Main Board

&

Power Supply


will put both on Craigslist and eBay next week, again pay for shipping and its yours