42' plasma....tatung

[medamotcha]

Re: 42' plasma....tatung

ok plainbill....ill do what you ask....ill test the power and voltages...it shows the voltages....now the cap that came out was a 22UF 20V ....and i sodderd a 22UF 24Volt....ill check the out put on the power supply...thx for the help..
....plain bill ...i have some experance with low voltage...i am certifide...but i never got into really deep into these tv...and have some collage in computer repair.....but thx for taking the time to explain what i need to know...ill post when i get the voltages...and i will look for what you said...

[medamotcha]

Re: 42' plasma....tatung

right now guys im looking for a repair man...for my tv....and in the middle of
painting my house.....ill be back in a few days from now....thx for all

[medamotcha]

Re: 42' plasma....tatung

ok guys im back...ok i test the power source...im reading 125.5volts..but the board says 250v....i have some pics ..ill post later

[medamotcha]

Re: 42' plasma....tatung

what kinda chasses do i have trying to find a repair man...but i found these
let me know if i did good

[medamotcha]

Re: 42' plasma....tatung

ok i tested again for volts.....im showing 50...at all fuses exceped one shows 1 or 2 volts......the 125.5 volts is coming from if i test from 1 board to the other fuse...this going to suck...the only way to get a true reading from a cap
is to take out of board.....im learning ..you have to discharge the caps first.by shorting the two....i have to stop right now ill be back

[medamotcha]

Re: 42' plasma....tatung

i dont think ..any of the caps are bad....

[medamotcha]

Re: 42' plasma....tatung

Need ESR meter.

First picture on this sticker is chart of voltages that panel uses, use this to compare against from Power supply and on two outer boards while TV is on.

Last picture is what you should look for particularly the type of panel it is.

Okay, check the capacitors with ESR meter. Once this is confirmed, then power up again, quickly feel the chips on left side just with one finger, other hand in the pocket.

Sometimes this fail. These are called Y-buffer driver chips on narrow strips of circuit boards. The larger board that plugs into the Y-buffer is Y-SUS board.

This is first thing we check for is voltage and inspect/feel the Y drive stuff.

Cheers, Wizard

what am i suppost for feel for? the y-buffer driver chips..one of my dads friends come over...he knowscomputer stuff and he said that it was the driver
that the tv was doing...so how do i inspect the driver chips on the y board

[medamotcha]

Re: 42' plasma....tatung

how do you want me to test ....please explain...you said to test the volts no the y board...explain where to put the multy meter leads + - too.....once i get a true reading i can compare to what its suppost to .and how to check the driver chips... i dont know how to check driver chips

[PlainBill]

Re: 42' plasma....tatung

how do you want me to test ....please explain...you said to test the volts no the y board...explain where to put the multy meter leads + - too.....once i get a true reading i can compare to what its suppost to .and how to check the driver chips... i dont know how to check driver chips

I've got the same feeling the lookout on the Titanic had when he saw the iceberg. He had to sound a warning, but he knew BAD things were going to happen.

First of all, get a better camera. The pictures you are posting are ALMOST useless.

Second, stop using Imageshack. Follow thethese directions for attaching pictures. At least then I don't have to worry about what 'extras' the hosting site is going to include.

I've marked up two pictures. The first is of the label with the voltages. Notice that it is illegible (see my first point above). I've circled 5 labels and the corresponding voltage of each.

The second is the back of the TV. Notice I've identified Cable 1 on the left. That goes to the Y-Sus card (I think). Cable 2 is on the right, it goes to the Z-Sus card (same qualification). Each end of these cables plug into connectors on the circuit boards. Samsung is nice, the board by each connector should be labeled with what each pin is carrying (Vsc, Va, Gnd, etc).

At the Y-Sus and Z-Sus cards measure the voltage to Gnd on the pins that correspond to the voltages on the label. I'll even make it easier. If 3 pins are labeled Va, and 5 are labeled Gnd, you only have to measure from 1 Va pin to 1 Gnd pin.

For extra credit, list the 5 voltage labels I circles, the expected voltage for each, and and the actual voltage you measured.

PlainBill

[medamotcha]

Re: 42' plasma....tatung

thx bill your the man....and thanks for helping me...ok, im on it..

[medamotcha]

Re: 42' plasma....tatung

i have a question...vscan what is that , and t-vsb... becouse thats led8004 thats the red light i traced it and vscan is thair and the green lights led 8001-3 tvsb right thair...but im going to do it your way. i just wanted to know what thay were and what thay do

[PlainBill]

Re: 42' plasma....tatung

i have a question...vscan what is that , and t-vsb... becouse thats led8004 thats the red light i traced it and vscan is thair and the green lights led 8001-3 tvsb right thair...but im going to do it your way. i just wanted to know what thay were and what thay do

This is one of those non-informative answers we all love. They are two of the voltages that are critical to the proper operation of a plasma panel. How they are generated, and what the red and green LEDS mean are the important thing, and I don't have a clue.

PlainBill

[medamotcha]

Re: 42' plasma....tatung

well check this out bill....i tested the SY and x-main ...Vs.....20v on both...it suppost to be 170v....the VA on the buffer plug.70v thats good......the ac input-125.00v....100-250v.....ill get the rest later ...but it looks like the power to the x main and the y main dont have enouph power going the vs..thats the red led8004..i knew it.ok now what do i check...or i have to pull out a cap and test it for the uF
let me know

[PlainBill]

Re: 42' plasma....tatung

well check this out bill....i tested the SY and x-main ...Vs.....20v on both...it suppost to be 170v....the VA on the buffer plug.70v thats good......the ac input-125.00v....100-250v.....ill get the rest later ...but it looks like the power to the x main and the y main dont have enouph power going the vs..thats the red led8004..i knew it.ok now what do i check...or i have to pull out a cap and test it for the uF
let me know

Well, I need more information on what you are seeing. To do that I want to see good quality pictures or diagrams of the power supply and the Y-sus and Z-Sus cards. And to do that, I need to know the part numbers. Since these are all Samsung boards, the part numbers should be in the same format.

The part number will start with LJ, two number, a dash, 5 more numbers, and a letter. For example, LJ41-03438A is the part number for a board in a Philips TV I have here. In the picture of the back of the TV there is a small board between the main power supply and the Y-sus. That is the Sub power supply, it's part number should be LJ44-00061A.

Again, I need the part numbers for the main power supply, the Y-Sus and Z-sus boards.

For what it's worth, I suspect the power supply. And no, you don't want to know what it will cost.

PlainBill

[medamotcha]

Re: 42' plasma....tatung

ok i tested again....i cant get a stady reading....on standby and power up..my meter is just bouncing...but no were neer the voltage its suppost to be.....VA was the right voltage 70...that was the buffers in 1-2....now the power supply....witch board is it...ill post all boards


the power supply ...is that the mother board? the big one in the middle?
please so no.lol......

[medamotcha]

Re: 42' plasma....tatung

here is some ill get you more pics and good ones

[medamotcha]

Re: 42' plasma....tatung

if it is the mother board...i guess can we trouble shoot...

[Wizard]

Re: 42' plasma....tatung

Problem with these part numbers on board they are internal PCB part numbers not part numbers for complete assy (most website that resells used parts incorrectly refer to internal PCB part numbers) and is not in samsung catalog. And unfortunely I don't have the model number you gave to me as it does not exist in samsung's website because it is not a full model # or unique model made for extremely specific area. Or it was produced more than 5 years ago when samsung transitioned from paper to webpage and PDF service manuals.

The pictures you showed us is X drive (on right side, rarely fail, check fuses). The left side is Y-drive/Y buffer (most common to fail), bottom row is Z-drive/buffer (extremely rare to fail).

Cheers, Wizard

[medamotcha]

Re: 42' plasma....tatung

Problem with these part numbers on board they are internal PCB part numbers not part numbers for complete assy (most website that resells used parts incorrectly refer to internal PCB part numbers) and is not in samsung catalog. And unfortunely I don't have the model number you gave to me as it does not exist in samsung's website because it is not a full model # or unique model made for extremely specific area. Or it was produced more than 5 years ago when samsung transitioned from paper to webpage and PDF service manuals.

The pictures you showed us is X drive (on right side, rarely fail, check fuses). The left side is Y-drive/Y buffer (most common to fail), bottom row is Z-drive/buffer (extremely rare to fail).

Cheers, Wizard

would that show and bounce reading...the buffer shows good 70 volts....the rest no go....

[medamotcha]

Re: 42' plasma....tatung


you see how the mother board gose...you have the white line the gose around one side...and you see the other..i can trace the path of allmost were current is going...funny thing i can read this...wel at least i can test the caps if i need to