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

[GR3Y5H3ART]

TV Model is Vizio GV42L and replaced the Power Board w/one working on eBay, VIZIO logo turns orange like before

my Dad was in electronics for 30+ years and brought me 3 Multi Meters and i want to test the voltage regulators but searched extensively and still can't figure them out


can someone please tell me how to use any one of these to measure this Main board

[tom66]

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

I'd use the middle one...

Keep probes like they are.
Set meter to 20V DC (the symbol with one solid line, one dashed line.)

Place the black probe on the TV chassis, this is your ground reference for now.
Place the red probe on each pin going to the main board in succession. Note the readings (post them here) and compare to the label.

[GR3Y5H3ART]

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

tried that and that was the one i was using...will try again today and thanks

[budm]

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

Please read this:
https://www.badcaps.net/forum/showth...999#post300999

[Ltank]

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

There are a bunch of videos on u tube

[GR3Y5H3ART]

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

There are a bunch of videos on u tube

i looked at some of those w/one of the most helpful being NorCal but even then after searching about exactly how to use these multimeters, i did not find a video

besides, the 4 22 Inch Samsung Monitors i had, i came on here back in 2011 and BadCaps was to say the least a god send


a BadCaps Member from Europe was even kind enough to send me CCFLs Bulbs, for free...from Europe!


thats why i wanted to wait w/these noob type questions but TVs are vastly different from Monitors yet similar in many ways that talking w/members is again, proving to be the best solution

[GR3Y5H3ART]

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

k got the numbers but the mutli meter was -0.04?

1.
pin 1 = 1.56
pin 2 = 0.00
pin 3 = 1.05

2
pin 1 = 1.25
pin 2 = 0.00
pin 3 = 1.38

3
pin 1 = 1.44
pin 2 = 0.00
pin 3 = 1.05

4
pin 1 = 1.45
pin 2 = 0.00
pin 3 = 1.04

5
pin 1 = 2.25
pin 2 = 0.00
pin 3 = 0.74

6 question, this one has 3 pins but the middle one is not solder?

[GR3Y5H3ART]

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

not 100% sure if i did the readings correct 1st time so put ground on chassis and measured:

1.
pin = 2.58
pin = 0.98
pin = 0.00

2.
pin = 2.58
pin = 1.16
pin = 0.00

3.
pin = 4.07
pin = 2.58
pin = 0.00

4.
pin = 4.08
pin = 2.58
pin = 1.58

5.
pin = 4.07
pin = 1.77
pin = 1.07

6.
pin = 0.00
pin = 0.00
pin = 0.00


so 6 is blown for sure?

[budm]

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

Please write down the P/N of each one of those regulators so we will know what they are, for example 1117-1.8, or 1117.
There also two SMD fuses on the board that you should check also, one is for 5V, another one is for the switched 12V.
Those 4.07/8 reading are not normal, I expect 5V reading. Is the meter good?

[GR3Y5H3ART]

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

All 4 say:

AMC1117
F0719J

except 2:

K1117S15
726

[anmol]

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

This may help you?
VIZIO GV42L HDTV & L42HDTV10A LCD TV Service Manual
Regards,

[budm]

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

All 4 say:

AMC1117
F0719J

except 2:

K1117S15
726

OK, the one with 1117s15 is the 1.5V fixed output voltage regulator, the other are Adjustable output regulators.
But which two are the 1117s15?

[budm]

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

1.
pin = 2.58
pin = 0.98
pin = 0.00

2.
pin = 2.58
pin = 1.16
pin = 0.00

3.
pin = 4.07
pin = 2.58
pin = 0.00

4.
pin = 4.08
pin = 2.58
pin = 1.58

5.
pin = 4.07
pin = 1.77
pin = 1.07

6.
pin = 0.00
pin = 0.00
pin = 0.00

So which two are 1117s15.

Please write down the P/N of each one of those regulators so we will know what they are, for example 1117-1.8, or 1117.
There also two SMD fuses on the board that you should check also, one is for 5V, another one is for the switched 12V.
Those 4.07/8 reading are not normal, I expect 5V reading. Is the meter good?

Did you do as I requested on checking the voltages on the fuses?
The 4V input voltage is not right, it is too low.
Check the voltage of the both SMD fuses at both ends against the chassis ground, if one of them shows 4V then you will have to fix the 5VSTBY power supply first.

[GR3Y5H3ART]

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

i meant #2...1,3,4,5 all AMC

[GR3Y5H3ART]

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

1.
pin = 2.58
pin = 0.98
pin = 0.00

2.
pin = 2.58
pin = 1.16
pin = 0.00

3.
pin = 4.07
pin = 2.58
pin = 0.00

4.
pin = 4.08
pin = 2.58
pin = 1.58

5.
pin = 4.07
pin = 1.77
pin = 1.07

6.
pin = 0.00
pin = 0.00
pin = 0.00

So which two are 1117s15.

Did you do as I requested on checking the voltages on the fuses?
The 4V input voltage is not right, it is too low.
Check the voltage of the both SMD fuses at both ends against the chassis ground, if one of them shows 4V then you will have to fix the 5VSTBY power supply first.

sry for being a noob but can you point out in the pic where the fuses are? i've seen norcals vid a number of times but wanna make sure n thanks for being so helpful

[retiredcaps]

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

sry for being a noob but can you point out in the pic where the fuses are?

They are just below the connector circled in red. They are labelled F1, F2, etc. I can only see 2, but the flash on the camera might be obscuring another one? A good fuse should measure less than 1.0 ohms.

[GR3Y5H3ART]

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

whats the part number for the 1117s? should i just replace them all or just the ones w/lower readings?

[budm]

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

Well, did you check the voltages at the fuses? the reading of 4V feeding voltage to the regulator is too low for the 5V Standby Voltage.

[GR3Y5H3ART]

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

not yet, i'd rather just buy all the parts and have them in hand just in case

can someone please help me w/correct part numbers from digikey

[budm]

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

These are what I stock for repair:
https://www.badcaps.net/forum/showpo...91&postcount=7