insignia. no picture/back light

[budm]

Re: insignia. no picture/back light

Same reading on the black fuse?

[tocold4u2]

Re: insignia. no picture/back light

24.37 v on one side of blk fuse and 1.098 on other side ??
i tried ohms but couldnt get a reading.

[tom66]

Re: insignia. no picture/back light

So, all three fuses are blown? While possible, that is really unlikely! Please double check all your readings. Here, a picture would -really- help to show us where you are probing.

[tocold4u2]

Re: insignia. no picture/back light

i just rechecked the 3 fuses. the white fuse on bottom is 24.37 on right side of fuse .
.001 on left side of the fuse. the other white fuse. is 24.37
.003 i measured the right side. on that one first. the black fuse at the
top was 24.37 and on the back side of it. was 1.098.

[budm]

Re: insignia. no picture/back light

Try reading right at the two legs of those black filter caps. Two blown 8A fuses + fuse for the PWM chip, does not sound right.

[tocold4u2]

Re: insignia. no picture/back light

You mean the caps at the bottom by the first white fuse ?
Did that last picture look any better.. i changed the size of picture.

[budm]

Re: insignia. no picture/back light

Those black electrolytics caps laying on its side, with its legs soldered to the pads, there are six of them.

[tocold4u2]

Re: insignia. no picture/back light

Yea those are the ones i measured all were 00.1
Those tan dots along right side..are those places to measure ?
Also could the wires from power supply to inverter board. be crossed ?

[tocold4u2]

Re: insignia. no picture/back light

Shouldn i be able to use a jumpe. n make the baclight co on atleast?
Voltages all look good other than the inverter board.
Just trying to think outside the box. lol

[tocold4u2]

Re: insignia. no picture/back light

I should get sound if i hook up a dvd player...and i dont get any sound.

[tom66]

Re: insignia. no picture/back light

Don't jumper the fuse until we know what is wrong.
Does this TV have two inverter boards? I see two power cables which is odd?

[selldoor]

Re: insignia. no picture/back light

i just rechecked the 3 fuses. the white fuse on bottom is 24.37 on right side of fuse .
.001 on left side of the fuse. the other white fuse. is 24.37
.003 i measured the right side. on that one first. the black fuse at the
top was 24.37 and on the back side of it. was 1.098.

Are you sure the black probe is grounded correctly - try again on the fuse in the picture using the ground screw next to it.

[tocold4u2]

Re: insignia. no picture/back light

Tom the inverter is just 1 long board. vt70064.50. (vt70064.51) rev.3
Voltage readings is still the same even when i use the screw next to the fuse.

[budm]

Re: insignia. no picture/back light

If those 8A fuses are blown, then you need to check ALL those MOSFETs (3-pin device) next.

[tocold4u2]

Re: insignia. no picture/back light

There is 6-8 bad mosfets on inverter board. im sure replacing these are going to be a pain
i have a few other inverter boards with mofets...you think i. can use them as replacements

[tom66]

Re: insignia. no picture/back light

You would need to check they are all the same spec - part # of bad FETs and of good FETs, look up datasheets and compare:
- Vds (must be higher or same)
- Rdson (must be lower or same)
- Qg (must be lower or same)
- package pins: must be compatible

That will narrow it down significantly.

[tocold4u2]

Re: insignia. no picture/back light

I will get the numbers off them n see if you guys can give me a hand with
stuff.

[tocold4u2]

Re: insignia. no picture/back light

I have a few mosfets. rjp30l4
Rf1501
Stu4385
Rjp30ea
larger in size any help if i can use these as replacements

[tom66]

Re: insignia. no picture/back light

Any of those in the same pin format (8 pins surface mount) and do you have at least a pair of identical ones?

[tocold4u2]

Re: insignia. no picture/back light

I have 12 but their on a board..not sure if i can get them off ot not ??may be easier just
ordering 10-12 off ebay or something