Forumsee logo
Forumsee » Consumer Electronics » TVs » Read message
RSS: Subscribe to RSS

Samsung UN40F6400 standby LED blink wont turn ON

Troubleshooting TVs and Video Sources - Badcaps Forums - www.badcaps.net
Its time to get expert help to fix my TV as its almost dead !!!

Its Samsung UN40F6400 and power board BN44-00622D

The problem is - When power up the TV - standby LED blink twice for 5 Times and relay click but not ON and cycle continue...

Based on advise from other thread on this forum and tested the below.

1. Disconnected Main board cable 20Pins (CNM803)

> LED backlight ON for half of the screen and half of screen flicker. Tear down the LCD panel and diffuser, found only top 3 Strip light UP and bottom 4 strips (2x2) flicker. So, removed the top 3 and swapped with bottom 4 LEDs but still top 3 is UP good and bottom same flicker.

Hope the LED strips are found to be good - Please concure.

2. Voltage measurement without Main board and LED panel connection

Power supply @ CNM803

OD On/Off - 3v

B13V - 13v

B5v - 5v

DIM1,2,3,4 - 3V

A5V- 5v

BLU on/off - 5v

Power On/off - 3v

++++++++++++++++++++++++

LED Driver - Legend

Ch 1-60v

Ch 2,34 - 120v

with/without LED

CM851/CNM852 - 46v/67v

CNM853 - 17v/35v

+++++++++++++++++++++++

Booster reading

Measurement without LED panel connection

Ch 1 - 70V (c9106)

Ch 2,3,4 - 150v (c9206/c9306/c9406)

Measurement with LED connection

Ch 1 - 44V (c9106)

Ch 2,3,4 - 85v (c9206/c9306/c9406)

HOT Caps reading (with/without LED)

CP810S - 305v / 396V

CP814S - 305v / 396Vc

+++++++++++++++++++++++

anyone has schematics of BN44-0622D ?
Date: Jun 18, 2017   


Last videos:

Serving Data to My LG OLED
Serving Data to My LG OLED
'L.A. To Vegas' on FOX
'L.A. To Vegas' on FOX
Samsung PN50B650, replaced Y board, now I have dark, snowy picture
Samsung PN50B650, replaced Y board, now I have dark, snowy picture
Assassination of Gianni Versace: American Crime Story FX HD 01/17/2018
Assassination of Gianni Versace: American Crime Story FX HD 01/17/2018
Suggestions/tips for preventing uneven wear/burn in thread
Suggestions/tips for preventing uneven wear/burn in thread
Samsung LN46A500T1F - slow power on - alternating static lines then ok
Samsung LN46A500T1F - slow power on - alternating static lines then ok
How Sony TV's are made
How Sony TV's are made
Samsung le32r86bd - Artifacts on the TV screen
Samsung le32r86bd - Artifacts on the TV screen

Cars ·
Travel ·
Pets ·
production-frontend