Re: Samsung PS58C7000 plasma TV service manual?

Hi Jamie,

The problem I had was that a capacitor was shorting the power to ground on the Y-Buffer board. This caused the smart power supply to shut down to prevent further damage. DoubleDratt88's "fast track guide" was very useful to get the problem narrowed down to the offending board. There is a chance that you have a similar problem. I posted a photo which shows the replaced capacitor. The original was covered with some semi-transparent glue (possibly from a glue gun) so that it was hard to see that the...

Re: Samsung PS58C7000 plasma TV service manual?

Here is a photo of the replaced cap. It is not pretty but it is functional....

Re: Samsung PS58C7000 plasma TV service manual?

I measured one of the nearby caps which are in the same sort of configuration near the panel connectors as the blown up cap. It is 100 nF but I couldn't determine the voltage rating. When I try to check the voltage present at the good ones my digital Fluke multimeter goes crazy. Even an analog multimeter behaves strangely. I suspect it is because of high frequency AC voltage. The caps are next to a 47 ohm resistor and a diode (all surface mount next to each other - in a parallel configuration).

Anyway I have first removed...

Re: Samsung PS58C7000 plasma TV service manual?

No luck at the rubbish tip, but I found the cause of all my trouble. With a bright light and magnifying goggles I discovered that one of the caps on the Y buffer board has blown up. It was covered with some semi-transparent glue, so I did not spot it when I looked over it initially.

Now the million dollar question - what capacitance value and voltage rating is C5566 or C5571 meant to have on a Samsung PS58C7000 plasma TV lower Y buffer (PBA: LJ92-01717B, Rev: R1.2, PCB No: LJ41-08418A)?

Anyone with a schematic...

Re: Samsung PS58C7000 plasma TV service manual?

Hi Tw2005,

Thanks for your replies. I am going to order the part from shopjimmy. The shipping is more expensive than the part. There is not much available in OZ, or if it is then it is at a crazy price. I wonder if I should visit the local rubbish tip. There is a good chance that there are a few broken Samsung plasma TVs there with these parts.

Cheers
Tom

Re: Samsung PS58C7000 plasma TV service manual?

After some more tests I determined that the lower "Y Buffer" is causing the Vs and Va signals to drop low after power up. When I disconnect the lower "Y Buffer" then I get a good picture in the top half of the screen.

I suspect that it is not viable to repair the "Y Buffer" board. So replacement is the only option. There is a small chance that the board has died as a result of a short in the panel.

Here are the details for the board:

Model: 58"US2_YB_LOW...

Yesterday my Samsung PS58C7000 plasma TV made a loud bang and the picture went blank (completely black screen). All other functions appear Ok. I have audio and can switch channels. This forum had some discussions about this specific model. I first thought that the loud bag was an exploding tantalum cap, but there wasn't the characteristic smell. When I pulled the back off the TV I couldn't see any obvious damage. Unfortunately I couldn't find a service manual for the TV.

I got DoubleDratt88's "fast track guide", but it hasn't got enough detail to debug this problem. I...

Re: New Members - please post your introductions here

Hi all, I have just joined after finding this forum with useful repair information for electronic equipment. I recently had rotting electrolytic cap problems on a 3 year old ASUS motherboard (surprising because I would have assumed that the manufacturers got their act together after 15 years).
Yesterday my Samsung PS58C7000 plasma TV made a loud bang and the picture went blank (completely black screen). This forum had some discussions about this specific model. I first thought that the loud bag was an exploding tantalum...