Vizeo plasma VP50 HDTV10A IPM of Y sus burn

[hienton2]

I am working with Vizeo plasma VP50 hdtv10A .2 resistors fuse on ysus board that show in picture are burn open.
I think the the IPM with small heatsink is bad.I order the IPM install to the y sus board and then I
test tv with y sus but without buffers. 2 resistors fuse are ok (buffers are disconneted from y sus)
. Anybody know how to check the buffers for shorted.please.I do not want spend another IPM (expensive they sold it with heatsink)
Buffer # 6871QDH115A, 6871QDH116A Thanks

[hienton2]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

more pictures

[hienton2]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

Test tv with buffers connected. Nothing burn but no picture. X boards heat sinks are not warm.IPM of y sys and x sus are warm hot. Any ideas . Thanks

PS: LOGO and light under logo not lit. Sound is OK

[hienton2]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

Is there anyway I can have test pattern from this logic board?

[capkid]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

I believe you can do these tests on the buffers:

- Place your leads on 1 and 2 in your picture, respectively, then swap them. You should see something like 0.67V in one direction and "OL" in the opposite direction.

- Place your negative lead on 1 in your picture then run your positive lead along the pins at the ribbon connectors to look for shorted chips.

The one thing I've found with these buffers is that the chips don't always completely fail. My boards showed horizontal lines on the screen. I replaced the chip on one of the buffers, but I think I may have had another failed component on the buffer. So, you may need to get your Y-Sus back to working order to fully test out the buffers.

Did you check the mosfets under the heat sinks on the Y-Sus and other nearby components when you removed the IPMs? I'm assuming you replaced the resistors that burned. My Y-Sus was so far gone that I had to replace it with a brand new one - paid about $120 for it.

[hienton2]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

Thank you so much Capkid.
With old IPM that burn 2 resistors fuse I see a short on a fet nearby. I think the IPM is bad and make the Fet look like shorted,I remove the IPM and install new one( actually It is a sub not original Because out of stock)from MCM.No more short any component on board.
Now I turn tv on with all boards connected.I have all voltages . led in front from red to green.No glow,sound is ok. vizeo logo no light.

Now I want to have pattern test from this logic board. To see if my new IPM works or not.

[capkid]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

I know Tom has mentioned using a jumper on EXT_AUTO_GEN on the control board, but I've never done it. I'd search the forum.

[hienton2]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

I do not see any jumper on the logic board.

[capkid]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

You have to install a jumper on the board. Here's a link:

https://www.badcaps.net/forum/showpo...38&postcount=2

[tom66]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

This does not apply to these old 50X2/X3/X4 panels.

[hienton2]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

Update image of logic board. I do not see any jumper.

[capkid]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

Ok, so Tom mentioned that using the auto-gen feature is not applicable to this TV model - good to know.

- Have you checked the components in circuit with the R85 resistor?
- Is the 1.5A fuse at location FS104 still good (near the bottom of the board)?

You may have to recheck your IPM to make sure it's still intact. I ended up replacing my Y-Sus with a brand new one because of all the time I spent troubleshooting it and the TV in general. There were too many faults for me to continue spending time on it, since I also had bad buffer boards.

[hienton2]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

I have 5v at fs104 The fuse is good.I also have 5v at fs105.May be after I fix -vy tv will work.

[capkid]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

Mine was blown, but it sounds like yours is ok. Do you have 5V on both sides of the fuse or continuity?

[hienton2]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

Mine was blown, but it sounds like yours is ok. Do you have 5V on both sides of the fuse or continuity?

Yes 5v on both sides.

One question -vy is voltage that has what reference ground.?where is black probe must be?

[capkid]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

Yes 5v on both sides.

One question -vy is voltage that has what reference ground.?where is black probe must be?

Yes, -Vy is checked to ground.

- The R85 resistor appears to trace back to the second pin from the bottom-left of IC18.
- The first pin and third pin from the top-left of IC18 trace back to C153, C156, and so on. If you turn the board over and follow the trace the opposition direction, you'll also see that these items are in circuit with C66, which is near the "SET UP" pot.
- T101 traces to D113
- YSUS_DN(-VY) of the the left-hand IPM traces to the left-hand lead of R63.

[hienton2]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

As I understand T101 produce -vy. I do not have voltage at D111 and D113.
I do not have -vy at R63.

[capkid]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

As I understand T101 produce -vy. I do not have voltage at D111 and D113.
I do not have -vy at R63.

I'd keep on tracing to other components. The switching regulator at IC104 appears to be the next logical place to check, since it's in circuit with T101. Again, you'll have to turn the board over on occasion and just check for continuity between leads and pads. A flashlight held up against the board may help.

[hienton2]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

I have LM2585s pdf. It does not have phisycal damage.-vy must be at R85 or R63?
Happy holliday Capkid.

[capkid]

Re: Vizeo plasma VP50 HDTV10A IPM of Y sus burn

I have LM2585s pdf. It does not have phisycal damage.-vy must be at R85 or R63?
Happy holliday Capkid.

Thanks. Do you have any voltage at LM2585's pins? The test point for -Vy is R85, but I'd also expect to see a reading at R63, since it's in circuit with R85.