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Samsung UN65H7100AFXZA Backlight on - No picture - Has sound

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    Samsung UN65H7100AFXZA Backlight on - No picture - Has sound

    Hello everyone! Well I have been in a repair nightmare with my 1 year old (as of last month and now out of warranty) Samsung 65" UN65H7100AFXZA.

    Issue:
    - Backlights are on without question / all lit even
    - LCD is displaying black with lights on
    - I get 6 blinks, but per search, this may not mean anything
    - I do get sound (well did prior to switching main boards.. may be another issue with this board)

    What I have done so far:
    - I searched and came up with the idea it was the T-con board. I removed it, check the fuse on it and all was good. Ordered up another for $25 and installed it. Issue still persists
    - At a total loss, I went ahead and ordered in a main board which just came in today. Installed it... same exact thing but now - no sound
    - I remove the smps and went over it in detail, testing every cap and diode on the front. Have not checked voltages yet out of the smps
    - Mainboard seems to have power, fiber optic port is lit
    - T-con seems to have power, blue LED is on

    I know nothing about TV's so this is all new to me. More than capable with testing. Any advice from the solder slingers on here?

    This is my first Samsung TV.. and per searching seems they have quite a few issues... I only watch movies and occasional netflix so I am totally blown away that this set has failed just outside of warranty! Leaves one with a sick feeling in their gut after shelling out a large amount of hard earned cash.
    Last edited by Jhelms; 11-13-2015, 08:44 PM.

    #2
    Re: Samsung UN65H7100AFXZA Backlight on - No picture - Has sound

    Update, did some further testing:
    - Interestingly, the PSU powers up when plugged in without having to jump PS-ON

    Pin voltages:
    Pin 1 = Nothing
    Pin 2 = pwm-dim4 3.242v
    Pin 3 = pwm-dim3 3.242v
    Pin 4 = pwm-dim2 3.242v
    Pin 5 = Gnd / nothing
    Pin 6 = pwm-dim1 3.242v
    Pin 7 = A13v 12.66v
    Pin 8 = OD-ON 1.338
    Pin 9 = A13v 12.66v
    Pin 10 = OD-Level 1.338
    Pin 11 = A13v 12.66v
    Pin 12 = BLU-ON 3.169v
    Pin 13 = A13v 12.66v
    Pin 14 = PS-ON 4.43v
    Pin 15 = A13v 12.66v
    Pin 16 = Gnd Nothing
    Pin 17 = Gnd Nothing
    Pin 18 = Gnd Nothing
    Pin 19 = Vamp 12.66v
    Pin 20 = Vamp 12.66v
    Pin 21 = Vamp 12.66v
    Pin 22 = Gnd Nothing

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