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Samsung P50C450B1W - S/by issue.
Turnip:
Thanks Bruce, will do.
Notice the logic board doesn't shut down the P/S, just the Vs. with PS low voltages still OK.
Chum mentioned that CS809 (68n/1250) can go O/C (top centre power board) and CS401 (Small Blue ceramic under heat sink RHS) on Y-Sus can go S/C - Not my problem though, but might be useful - Chris.
downunder:
Hi Chris,
Yep, Main activates PSU via PS-ON and logic board activates Vs via VS-ON. Were you able to get test patterns going?
My gut feeling is that the main board is at fault, given that the Logic board LED is giving wrong code. Bruce
Turnip:
Thanks Bruce,
Didn't realise the logic board Led had a code as suspected a flash every three seconds might be normal.
Note that on Ebay, every panel for this set is really cheap, except screen, speakers, stand screws, mains lead and the genuine RCU.
Have ruled out speakers and RCU. screen seems pretty well OK, so think go for the SSB as first option - Chris.
Turnip:
Hi Bruce,
Forgot to mention tried the Test Pattern biz, but as Vs from logic shuts down (3v to zero) in a couple of seconds (other P/S
voltages OK) don't get any display.
Guess logic checks for error most everywhere, seems most errors don't knock off Vs judging from pictures on the 'fast track'
Out of interest, if screen damaged (Looks OK) would logic cut the Vs, as suspect air in the panel would prevent operation ?
Many thanks - Chris.
downunder:
Hi Chris,
In my experience, a cracked panel always takes out the buffer boards, and possibly the Y-main. Are you able to try the TV with the buffers removed from the Y-main.
Another thought, since a lot of error signals from scan circuits are routed via the logic board to the main, why not try removing the flex that goes from Y-main to logic, and see if the LED on the logic returns to 1 blink per second. May indicate a faulty Y-main.
Could try forcing Vs on but will likely create more mayhem than currently exists. I hate these sort of faults where only solution sometimes is to keep throwing replacement boards at the unit. See how you go.
Bruce
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