Hello everyone, my name is Steve and I'm new to the forum. My TV is a 2009 Samsung 50 inch plasma model no. PN50B650S1F. I looked here and other places on the net and I didn't see this specific issue, so before I throw parts at it I was hoping for some good advice. My experience level repairing TV's/electronics is best classified as βbeginnerβ. I can take good quality pictures/video if we need them.
Before service observations:
1) Upon plugging in the unit a click-click is heard, then about a second later another click-click. Television does not come on and intro chime is not heard. This continues as long as the unit is plugged in.
2) The red light on the front of the TV comes on when plugged in and remains on until the unit is unplugged regardless of noises heard.
3) The remote has no effect on the TV whatsoever, batteries checked.
4) There are no overheating smells or smoke coming from the unit
5) Outwardly the unit is clean and in excellent condition.
Removed back cover:
1) Unit was very dusty inside with dust bridges between the solder legs of many components. No evidence of water/liquid intrusion was found.
2) Upon plugging in the unit, the red light on the front of the TV illuminates continuously and a click-click is heard. The green LED number 2001 on the control board flashes twice in rapid succession then LED 2000 flashes on for about 1/20sec then 1/10sec. Another click-click is heard. This sequence lasts for about a second and repeats until the unit is unplugged.
3) Disconnected both X and Y boards from the power board. Unit still continues to cycle as above.
4) CAPS were visually inspected on the power board and have no outward signs of failure.
5) Board was inspected. No overtly hot spots were seen and all solder joints appear solid. The board has a slightly tan/brown appearance on the green printed circuit side near the long brown heat sink, on the lower voltage side of the power board. This heat sink looks like it has 7 MOSFETS on it.
6) The click-click is coming from a relay at location RL801S.
7) When the unit is plugged in, after the first click-click, standby voltage (spec 5.3v) comes up to 5.23v, Vs (208v) and Va (56v) reach specified voltage. After the second click-click the standby voltage immediately drops to zero while Vs and Va trail off slowly. This sequence repeats until the unit is unplugged.
8) One HDMI port on the input board is loose. A couple wires are broken and sticking out.
The troubleshooting guide I used says to replace the power board and re-test. My preference is not to replace parts blindly but test and troubleshoot as best I can then replace what is needed. I have a DVOM but nothing to check the CAPS accurately and I can unsolder/solder components on a board. I have a soldering iron but no other specialty soldering equipment.
Thanks everyone for any help or advice!
Before service observations:
1) Upon plugging in the unit a click-click is heard, then about a second later another click-click. Television does not come on and intro chime is not heard. This continues as long as the unit is plugged in.
2) The red light on the front of the TV comes on when plugged in and remains on until the unit is unplugged regardless of noises heard.
3) The remote has no effect on the TV whatsoever, batteries checked.
4) There are no overheating smells or smoke coming from the unit
5) Outwardly the unit is clean and in excellent condition.
Removed back cover:
1) Unit was very dusty inside with dust bridges between the solder legs of many components. No evidence of water/liquid intrusion was found.
2) Upon plugging in the unit, the red light on the front of the TV illuminates continuously and a click-click is heard. The green LED number 2001 on the control board flashes twice in rapid succession then LED 2000 flashes on for about 1/20sec then 1/10sec. Another click-click is heard. This sequence lasts for about a second and repeats until the unit is unplugged.
3) Disconnected both X and Y boards from the power board. Unit still continues to cycle as above.
4) CAPS were visually inspected on the power board and have no outward signs of failure.
5) Board was inspected. No overtly hot spots were seen and all solder joints appear solid. The board has a slightly tan/brown appearance on the green printed circuit side near the long brown heat sink, on the lower voltage side of the power board. This heat sink looks like it has 7 MOSFETS on it.
6) The click-click is coming from a relay at location RL801S.
7) When the unit is plugged in, after the first click-click, standby voltage (spec 5.3v) comes up to 5.23v, Vs (208v) and Va (56v) reach specified voltage. After the second click-click the standby voltage immediately drops to zero while Vs and Va trail off slowly. This sequence repeats until the unit is unplugged.
8) One HDMI port on the input board is loose. A couple wires are broken and sticking out.
The troubleshooting guide I used says to replace the power board and re-test. My preference is not to replace parts blindly but test and troubleshoot as best I can then replace what is needed. I have a DVOM but nothing to check the CAPS accurately and I can unsolder/solder components on a board. I have a soldering iron but no other specialty soldering equipment.
Thanks everyone for any help or advice!
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