Picked up a Samsung 46" LCD, LN46a750rif. Powered tv, relays on the power supply click to power on, about 8 seconds later click again to power off. All the while the power light flashes 7 times. All voltages coming from supply are good, fuses good tcon,inverters. I can hear a faint high pitched pulse sound coming from power board, its obviously a main board fault. I wanna fix the main board, anyone?
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Re: Samsung LN46a750Rif cycling/clicking
""I can hear a faint high pitched pulse sound coming from power board" I would try to find out why it is making the sound first. Good clear pictures of the boards?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809 -
Re: Samsung LN46a750Rif cycling/clicking
I have had a couple other tv's "high pitch hum pulse sound" coming from the power supply over the years. It USUALLY ended up being main board was loading up the power supply, hence the sound. Here is the pics.Attached FilesComment
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Hello everybody, I could use some help on this one... It's got me guessing...
I took pictures of all the boards and the pin out of the connector on the power supply that goes to the main board... I measured all the pins in relation to chassis ground, here are the result.
(B13v)1. 12.7 volts cycling (Vamp) 2. 12.7 volts cycling
(B13v)3. 12.7 volts cycling (PWM5) 4. 1.0 volts cycling
(OD_LE)5. 2.8 volts cycling (PWM4) 6. 0.9 volts cycling
(OD_ON)7. 2.8 volts cycling (PWM3) 8. 0.9 volts cycling
9. ground (PWM2) 10. 0.9 volts cycling... -
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