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Samsung LE40R87BD LCD TV - relay clicking repeatedly but wont start
Contrast John:
Hi all
Thought this was going to be an easy one, but after replacing the domed and split electrolytics on the 5 volt line (power board) I was left with exactly the same symptom - relay clicking continuously at about 10 second intervals but the set not starting. While the relay is energised all voltages marked on the psu output socket are present and correct. Suspect some damage further downstream on the signals panel, possibly a damaged regulator or corrupt eprom. Has anyone encountered this situation before, or does anyone have a service manual / schematics for this model. Any advice would be much appreciated.
Thanks
John.
RBelectronics:
try to disable lvds connector.maybe electronics of panel broken
tv john:
Hi John, I'm quiet today and found some vague info.Go to the sm eeprom ic that sits near the LVDS plug on main pcb.Short the data & clock pins (?) on this ic,switch on and when relay clicks remove short.
Tv should come on,enter service mode(sorry no info),set tuner to auto & select reset.
Thats all the info I have and never had to test it out.
Best of luck tv john.
Contrast John:
Hi RB and John
Have tried disconnecting the LVDS cable but the fault remained the same. Cant see any signs of stress on any board. The eeprom reset sounds interesting and suggests someone has been this way before.Will try it and keep you posted.
Thank you both for your input.
John.
Contrast John:
Hi John and RB
Set now up and running. It was a case of a corrupted eeprom. Thanks John for the info.
For anyone with the same problem the procedure is as follows.
On this model the eeprom in question is IC 1803 (24C256) 8 pin smd and is located on the underside of the main board near the common interface. The clock and data pins are pins 5 and 6 and are identifiable by the 100 ohm smd resistors connected to each of them. Fit a shorting link (on long wires) between the pins. Reassemble the chassis. Switch on and then remove the short. Bring the set out of standby. Now access the service mode as follows-
Using the remote control, switch to standby, press info, menu, mute and power. The set should start and display the service menu. Using scroll keys select item 8 and enter by scrolling right. Select "tuner" and set to auto. Revert to previous screen by pressing menu. Now scroll to "reset" and enter by scrolling right. The set will revert to standby. Power back on and tune in stations. Thanks again tv john for the information.
John.
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