Have the following 50" BUSH (Re-branded Samsung) BPDP50FHD
made in march 2010.
Initial fault was Stuck in stand by, Turns on for 2 secs then would shut down
This was traced to 3 shorted 30F02 transistors on the X-Main board - replaced
Now the TV powers up - power led stays green and does not shut down.
Theres a flicker on the panel on first power up with a screen full of sparklies on a dark background.
This all disappears with in 2 seconds leaving a dark screen.
Va, Vsc & Vs all seem ok & jump to a value close to there expected value, but then they all disappear with in 2 secs slowly ramping down.
I metered the diodes & transistors on heat-sinks on the Y-Main & PSU all seem ok.
Strangely there is a hole in the top of the relay (contact end) that shorts out the NTC after initial power up.
Checked for shorts on the y-buffers cant find any.
No bulged caps on any boards.
There is a green led on the tcon PCB which blinks very slowly about 4 or 5 secs.
Looking for insight/advise on what to look for next
Many thnx
E
Panel voltages from lable Va = 55 Vsc = -198 Vs = 211 2Ve = 77 Ve = 89
Boards are all Samsung as follows (I can scan for better quality pictures if needed)
x buffer - LJ92-01681A LJ41-08460A R1.2 (AA2)
X MAIN - LJ92-01682A LJ41-08457A R1.3 (AA6)
YMAIN - LJ92-01683A LJ41-08458A R1.3 (AA5)
YBUFFER - LJ92-01680A LJ41-06755A R1.1 (AA3)
Logic Buffer E - LJ92-01703A LJ41-08383A R1.4
Logic Buffer F - LJ92-01704A LJ41-08384A R1.4
Panel - S50FH-YB06 (S50FH-YD13)
made in march 2010.
Initial fault was Stuck in stand by, Turns on for 2 secs then would shut down
This was traced to 3 shorted 30F02 transistors on the X-Main board - replaced
Now the TV powers up - power led stays green and does not shut down.
Theres a flicker on the panel on first power up with a screen full of sparklies on a dark background.
This all disappears with in 2 seconds leaving a dark screen.
Va, Vsc & Vs all seem ok & jump to a value close to there expected value, but then they all disappear with in 2 secs slowly ramping down.
I metered the diodes & transistors on heat-sinks on the Y-Main & PSU all seem ok.
Strangely there is a hole in the top of the relay (contact end) that shorts out the NTC after initial power up.
Checked for shorts on the y-buffers cant find any.
No bulged caps on any boards.
There is a green led on the tcon PCB which blinks very slowly about 4 or 5 secs.
Looking for insight/advise on what to look for next
Many thnx
E
Panel voltages from lable Va = 55 Vsc = -198 Vs = 211 2Ve = 77 Ve = 89
Boards are all Samsung as follows (I can scan for better quality pictures if needed)
x buffer - LJ92-01681A LJ41-08460A R1.2 (AA2)
X MAIN - LJ92-01682A LJ41-08457A R1.3 (AA6)
YMAIN - LJ92-01683A LJ41-08458A R1.3 (AA5)
YBUFFER - LJ92-01680A LJ41-06755A R1.1 (AA3)
Logic Buffer E - LJ92-01703A LJ41-08383A R1.4
Logic Buffer F - LJ92-01704A LJ41-08384A R1.4
Panel - S50FH-YB06 (S50FH-YD13)
Attached Files
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