esa plasma panel gassy

[Tvbob]

Hello fellas, I acquired a ESA (LG) dpd4294lv1 plasma tv mfd 2005
It came with an extra (Z) sustain board. Both boards load down PSU.
the (Z) sustain supplies half of the "potential" to the panel,What are the signs of air in the panel. The vacuum nipple is in tack. Should i try a 3rd (Z) sustain board . thanks

[PlainBill]

Re: esa plasma panel gassy

Hello fellas, I acquired a ESA (LG) dpd4294lv1 plasma tv mfd 2005
It came with an extra (Z) sustain board. Both boards load down PSU.
the (Z) sustain supplies half of the "potential" to the panel,What are the signs of air in the panel. The vacuum nipple is in tack. Should i try a 3rd (Z) sustain board . thanks

If I recall correctly, the troubleshooting directions for the panel suggest troubleshooting power supply problems by disconnecting the power cables to the X, Y, and Z modules in turn. If the power supply recovers when power is disconnected from a particular module, the next step is to replace the module.

In this situation, my approach would depend on the severity the board presents to the PSU. If the power supply fails to come up at all (massive overload), I would check the semiconductors in the Z-sus. If I found any shorted I would either replace the semiconductors or the Z-sus as appropriate.

If, on the other hand, only one of the power supply outputs would not reach full voltage, I would check the power supply itself first.

PlainBill

[Tvbob]

Re: esa plasma panel gassy

Thanks plainBill I bought this tv at an auction,i don't know any history of it (being banged around etc) With Vcc to the (z) sustain unplugged, Power supply fires up with sound, Have led's lit on the formatter board. Both (z) sustain modules load down the power supply and its cycles 2 times and shuts down. The (z) sustain board drives half the plasma panel... Can i disconnect the panel from the (z) sustain module and run it? What is the the output voltage ? Can it be ran into a dummy load ? Back in my day (crt days) when you had air in the tube. There was arcing in the neck from the focus and G1 grids Thanks again.

[PlainBill]

Re: esa plasma panel gassy

Thanks plainBill I bought this tv at an auction,i don't know any history of it (being banged around etc) With Vcc to the (z) sustain unplugged, Power supply fires up with sound, Have led's lit on the formatter board. Both (z) sustain modules load down the power supply and its cycles 2 times and shuts down. The (z) sustain board drives half the plasma panel... Can i disconnect the panel from the (z) sustain module and run it? What is the the output voltage ? Can it be ran into a dummy load ? Back in my day (crt days) when you had air in the tube. There was arcing in the neck from the focus and G1 grids Thanks again.

Actually, the Z-sustain board drives the entire plasma display. As do the Y-Sustain and the X-drivers. They just provide the drive to different elements of the display.

I don't have enough experience to know if a broken plasma would load down the Z-Sustain board. I DO have a few suggestions, however.

Wizard has extensive experience with plasma TVs. He may have explained the symptoms of a cracked panel.

Since the set was made by LG, go to scribd.com and search for LG plasma training manual. The translation is horrible, but you can learn a little about how they work. And what parts not to touch.

Search for the part number of the Z-sus. If it is one of those with a hybrid, they are notorious for shorting.

PlainBill

[Tvbob]

Re: esa plasma panel gassy

Thanks again plainbill, What I meant to say is The (z) sustain supplies half the potential to the plasma panel. I bought a pdf manual on ebay Very bad Chinese translation. Shows schematic of main PSU. Nothing nothing on the sustain boards, Says there is an (IPM) ic intelligent power module on the (z) sustain but no schematic or voltages. Thinking about about connecting the output of the (z) sustain to a neon tube back to cold ground . IF the set stays on I must have an gassy panel.I am kinda curious if I will get any glow out of the neon, It takes about 3-5 kv to lite neon.