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Equipment Repairs => LCD TV forum => Topic started by: t1412 on July 13, 2020,12:27:57

Title: Ue55d7000
Post by: t1412 on July 13, 2020,12:27:57

Hi fella's has anyone repaired this psu, it's a  bn96-00428b, clicking i disconnected the mainboard no backlight showed, or anyone got a service manual thanks     

shaun

Title: Re: Ue55d7000
Post by: downunder on July 14, 2020,04:28:53

Hi Shaun, Most service manuals don't have power supply schematics because they're usually sourced from a third party. However, if it's continually rebooting, check the pins on the large transformers on the power board, especially the ones that go through rivets on the board -they suffer from dry joints.                 Bruce

Title: Re: Ue55d7000
Post by: downunder on July 14, 2020,04:37:55

Here's the service manual for the Oz version UA55D7000.

Title: Re: Ue55d7000
Post by: t1412 on July 16, 2020,14:54:51

Hi bruce thanks for the service manual, where i buy my parts from they have a technical department, apparently the d series doesn't have the backlight test built in, which caught me out, looking like a mainboard fault,will update if i find one. thanks

shaun     

Title: Re: Ue55d7000
Post by: Davy on July 30, 2020,07:59:44

Have a look here https://elektrotanya.com/samsung_bn44-00428b_led-tv_power_supply.pdf/download.html (https://elektrotanya.com/samsung_bn44-00428b_led-tv_power_supply.pdf/download.html)

I sometimes end up searching for the power supply separately.... do be careful though, there may be slight variations for different sets. Check all diodes for leaks or s/c, especially on the inverter side.

Dave