Re: Samsung LN52B550K1F no backlight has picture has sound
Both main caps read 64-64V AC and 319/-55 V DC against ground and 0V AC and 390 V DC from themselves. This is about the same as the good TV....
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Re: Samsung LN52B550K1F no backlight has picture has sound
Both main caps read 60-64V~ with inverter unhooked from power board. But there is a surge of volts at the begining exceeding the multimeter (>750~).
I can see an image like this with a flashlight put in the holes from the back.
All little transformers on the inverter board read about the same ohm (output 17 ohm between pin2 and pin1/3, input 0 ohm between pin1 and pin4, 0ohm between pin2 and pin3, open between pin 1/4 and pin 2/3). The little transformers model is 488R B8CU1.
I don't...
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Re: Samsung LN52B550K1F no backlight has picture has sound
@KYBOSH
I picked it up from others in this state. It's free.
Following the troubleshooting part, I started with "No power" section:
backlight off, power LED flash 5 times after down.
BD102:5.1V
BD104:12V
BD108:13V
BD106:5.1V
R102:3.3V
R171,R173,C122,R527: all good
LVDS pin1-5:12V
T-con fuse:12V
power is supplied.
Then it tells me to go to No video-HDMI part but I have...
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Samsung LN52B550K1F no backlight has picture has sound
Hi I have a samsung LN52B550K1F LCD TV. There is no backlight but I can see a picture under a flash light. The sound is playing as normal. I have attached the pictures of the boards.
With my laptop connected to HDMI4 port, I tested the voltages of the connectors:
Power board (BN44-00267B) to main board (BN97-03035M) connector (CN801):
5V_DET 0.1V
E-PWM 2.77
I-PWM 0
INV-ON 0.05
13V 12.81
5.1V 5.15
SB 5.2V
PS 1.22
SYNC 1.74
Power board to LED driver board (SSB520H18V01):
VCC...
No activity results to display
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