Question about Sampo PME-42S6 42 in. HD-Ready Plasma Television
I have a sampo plasma tv that I paid 3 grand for back in '02. The model is pme-42s6, which I'm am somewhat of a hobbyist and really don't want to trash the tv even thought I already bought a new lcd tv. When I opened the back of the unit and plugged back in the power cord, at first 3 green led's lite up then a few seconds later a red led lite up. Next to the red led is the word alarm. So I unplugged the cord, and searched on forums as to what the cause may be. One forum said it could be the ceramic fuses of which there are 3, one on the power supply board and 2 on the auxilary power supply. After hunting down these two fuses and local tv repair shops who also were unwilling to sell these, without asking a bunch of questions, I was able to get all 3 fuses for $6. I replaced all fuses plugged in power cord and again same red led lit up. So here I am asking if anyone else has had this same problem?
I had a similar problem with my 42" set, a re-badged SAMPO unit bought during 2002 in the UK. It was working one day and when turned back on the next day there was no picture. The clicking noises that occur when the set is switch on happened but not in the usual pattern. The symptoms were the same as a fault it had approximately 10 months after I bought it, although it was then repaired under warranty by swapping out the PSU.
I took the back off the set and confirmed it had the LJ44-00025A PSU board. When first plugged in the green LEDs on the PSU would light and the relays would click. There would then be a short buzzing noise, the relays would click and the green LEDs would go out. The red "Alarm" LED would then light.
After reading posts on a number of forums pointing to the PSU being at fault, I ordered a replacement PSU from ADC in the US ($139.00 + shipping) but that did not fix the problem. After downloading the service manual I then followed the instructions to check and set the PSU voltages, during the time that the three green LEDs were lit. I found that the VA value was zero and the others were a lot lower than they should have been. The service manual shows that the voltage tests are carried out with most of the sub-boards connected, except the Image Board and front panel switches. I then disconnected each connector in turn from the PSU and found that when the connector for the Logic F-Buffer board (LJ92-00601A) was disconnected the PSU would not alarm when powered up and the five voltages were close to normal. I found a replacement 2nd hand F-Buffer board on fleabay for about £17.00 and once fitted I re-tested and set the five voltage levels for the PSU. The TV is now working as well as it ever has. I have since tested the original PSU and confirmed that it also works, although the voltage levels needed adjusting. I hope this helps.
Posted on Jul 06, 2010
Ok this problem was alot more simple than i thought, it's the relays that you hear clicking. I took out my board and took it to my friends shop where he fixes plasmas and lcds etc....
We tested all the capacitors on the board... tested good
Then tested the two transistors i saw someone speak about chaning in another post.. tested good
Now the last thing i tested were the two relays on the board you have to take them out the board to test them here's how.
Get a 9 volt battery and a multimeter that beeps when it detects continuity. Using the 9 volt battery put power on the coil end of the relay this is the end with the pins directly opposite each other, now you should hear it click leave the power on it then using the multi meter test the pins on the other side of the relay if it beeps it's good, if not bad.
I purchased both relays from www.mouserelectronics.com the part # is JW1AFSN-DC5V they only cost $2.58 each it's best to change both even if one tests ok.
Posted on Feb 18, 2009
Try adjusting the tint & color. I have a problem with color looks like red is missing It is mostly green.
Posted on Nov 09, 2010
have identified a common problems with theses sets manufactured by,
SVA, Gateway, Viewsonic, Sampo and a few other brands. They all have a
Samsung power supply board (LJ44-00025A), which has cause these units
to lose power. There is a easy fix, replace the power board. But you
ask why should we? That's the right question. If these boards all have
the ability to fail with various parts and within various displays.
This has to be a defective part. As of now, there is no recall on this
part. Therefore, we are generating a list of customers, who own these
displays and are requesting a refund for previously purchased parts or
a replacement part at no cost to the customer. We are in
the prelimary stages, so please be patient with our efforts.
If have indentified your unit is salvage by an power issue an wish to purchase the indentified part (LJ44-00025A, we recommend you purchase from http://www.adc-ast.com/.
We cannot guarantee that any monies will be refunded by this claim.
Samsung Claims Administrator
If you are interested in participating in this claim, please email the requested below to email@example.com
Posted on Apr 06, 2009
You need a power supply board Fix it for $139.00 can do it your self unplugg the unit put keep the new fuses i have a phone # they have the board gatway & samsung will not gave you the parts.
Posted on Feb 07, 2009
When the set is first turned on, there is a startup sequence that occurs. There are problem detection circuits throughout the set that once trigered, cause the set to shutdown. What you are seeing is the set entering its protect mode. There is an internal problem that is causing this shutdown. Were there any problem symptoms prior to this shutdown problem? That may provide a clue to the problem. Plasma sets don't usually just stop. There is the possibility that the power supply is defective. Since it is what is called a "switch mode" supply, defective capacitors can prevent the supply from starting up properly. Without seeing the unit and taking measurements inside, it will be difficult if not impossible to resolve this remotely. I would suggest that you invest in a detailed repair estimate from a local service shop. This should not cost more than about $50 or so. Post the estimate details here and we should be able to guide you through the actual repair.
Posted on Jan 22, 2009
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