Samsung UN55ES7003
made house call.
red power led comes on, blinks twice, no display, no backlight, relay clicks, repeat.
psu has self test feature.
disconnected from mainboard.
determined PSU ok BL ok.
suspect mainboard.
disconnecting tcon has no change on operation.
markings on mainboard:
BN97-06531P 0151
BN94-06123R
found and ordered replacement on ebay https://www.ebay.com/itm/394077328633
for 54$
second house call:
with replacement mainboard, tv turns on, has sound, but no backlight and no picture.
when tcon is disconnected, tv has sound, and only the bottom 1/4th of the screen appears to be lit.
i believe this is an edge lit screen.
never seen that before. i was expecting the whole screen to be lit.
maybe its some kind of error code to tell you the tcon is disconnected?
when i do backlight test by disconnecting mainboard, the whole screen is lit.
inspected TCON more closely (should have done on first house call) and found that 12v is coming into the fuse,
but not out the other side. fuse is blown!
further inspection reveals there is a short to ground somewhere in that area of the board.
the short to ground seems only in that area and affects 3 capacitors on the backside of the board as well.
i removed 3 small surface mount ceramic capacitors on the front and lifted the leg of diode D100 but the short is still there.
i am thinking of removing the IC that is in that area as it also shows shorted and could be the source of it.
if that doesnt work i can continue shotgunning parts off the board, or actually learn how to do voltage injection.
made house call.
red power led comes on, blinks twice, no display, no backlight, relay clicks, repeat.
psu has self test feature.
disconnected from mainboard.
determined PSU ok BL ok.
suspect mainboard.
disconnecting tcon has no change on operation.
markings on mainboard:
BN97-06531P 0151
BN94-06123R
found and ordered replacement on ebay https://www.ebay.com/itm/394077328633
for 54$
second house call:
with replacement mainboard, tv turns on, has sound, but no backlight and no picture.
when tcon is disconnected, tv has sound, and only the bottom 1/4th of the screen appears to be lit.
i believe this is an edge lit screen.
never seen that before. i was expecting the whole screen to be lit.
maybe its some kind of error code to tell you the tcon is disconnected?
when i do backlight test by disconnecting mainboard, the whole screen is lit.
inspected TCON more closely (should have done on first house call) and found that 12v is coming into the fuse,
but not out the other side. fuse is blown!
further inspection reveals there is a short to ground somewhere in that area of the board.
the short to ground seems only in that area and affects 3 capacitors on the backside of the board as well.
i removed 3 small surface mount ceramic capacitors on the front and lifted the leg of diode D100 but the short is still there.
i am thinking of removing the IC that is in that area as it also shows shorted and could be the source of it.
if that doesnt work i can continue shotgunning parts off the board, or actually learn how to do voltage injection.
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