Samsung Plasma PN64F5500

[Jasin]

Re: Samsung Plasma PN64F5500

Did you replace UQ802? I bet you now lost you're 5volt standby,and have about 4.1 volt on ps-on,correct?
Hope you still have the old UC802,as the one in the kit don't work.
I have two boards here,one I just bought and one I'm trying to fix. If you need voltages etc,let me know.

I replaced 802 and 804 first before I did anything else. Why would the new one in the kit not work?

I never had any voltage on the 5.3 volt or PS-ON.

Funny enough the kit came with a replacement fuse for T12AH250 soldered on fuse but not the T2AH250 in the middle. I removed it and everything is still as it was. I'm wondering if I just need a new one of those. If so I'll be mad at myself.

It would be helpful if I had schematics. I guess my main question.

Voltage on the left side of the middle fuse is 78 VDC voltage on the right side is -80 VDC. Is this normal?

[Jasin]

Re: Samsung Plasma PN64F5500

I'm sorry I read your post too fast.

I did not replace UQ802.

Here is what is in the kit I replaced.

QS802C QS804C
DS808 DS810
RS819 RS833
RS827 RS835
DS813 DS807 DS809 DS814
FS801S
RS854 RS855

[martino]

Re: Samsung Plasma PN64F5500

Voltage on the left side of the middle fuse is 78 VDC voltage on the right side is -80 VDC. Is this normal?

No,that's not normal,that fuse is blown.

[Jasin]

Re: Samsung Plasma PN64F5500

No,that's not normal,that fuse is blown.

Is that normal without the fuse? Want to make sure it doesn't blow again just by turning it on. Fuse ordered 4 more days of waiting

[martino]

Re: Samsung Plasma PN64F5500

Voltage on the left side of the middle fuse is 78 VDC voltage on the right side is -80 VDC. Is this normal?

It really should read around 164 volts on left side of fuse,not 78.
What are you using as ground to read that?
This fuse is in the HOT side,so negative leg from main caps should be used as the ground in measuring.

[Jasin]

Re: Samsung Plasma PN64F5500

It really should read around 164 volts on left side of fuse,not 78.
What are you using as ground to read that?
This fuse is in the HOT side,so negative leg from main caps should be used as the ground in measuring.

Thank you for that. I was using ground screw to measure. So all my measurements have been wrong from post 1. Will wait to get fuse and will post back with new measurements if I still have an issue.

[Jasin]

Re: Samsung Plasma PN64F5500

So I got the fuses and replaced the blown fuse. Plugged my TV and a big loud pop and a spark. My board is dead, most likely what happened the first time, I'm not going to try and repair it.

Can anyone recommend a good place to buy one from?

[martino]

Re: Samsung Plasma PN64F5500

I just bought one,they are hard to find and if you do,they cost a lot
Now,I bought mine cause the board I have has some traces buggered up.So my plan is to use this new one to trace out the old board,fix the old board and use it and sell the new one. If you are interested I can sell it to you,but will need a few days to use it to trace it out for the old one.

[Jasin]

Re: Samsung Plasma PN64F5500

Ok, well I got a powerboard from China, Doesn't look the best, little rusty as well. However I popped it in and now I see a flashing red light on the tv.

I can relays click, hear the capacitors start to charge up the light flashed 5 times then the tv resets and does it again.

Any thoughts of what to check from here?

[Jasin]

Re: Samsung Plasma PN64F5500

Bump

[sordids999]

Re: Samsung Plasma PN64F5500

So unplugging the cables from the power supply to the Ysus and Zsus are you getting any VS/VA voltage readings ?
They need to match the voltages on the sticker on the panel

[Jasin]

Re: Samsung Plasma PN64F5500

So unplugging the cables from the power supply to the Ysus and Zsus are you getting any VS/VA voltage readings ?
They need to match the voltages on the sticker on the panel

Leaving the main plugged in though right?

Doing that VS goes from 250 when it turns on down to 130 before I hear it reset and start over.

VA goes from 110/105 down to 90 before it resets again.

[Jasin]

Re: Samsung Plasma PN64F5500

Bump

[Jasin]

Re: Samsung Plasma PN64F5500

Bump. Just need to isolate this new powersupply to make sure it is ok or not so I can dispute it.