230V AC

Front LED

230V AC

PSU

5Volt Always on PSU

Backlight Inverter

Main Control PWB

5V=on, 0V=off

Infra Red

Receiver

12V + 24V switched Power

supply

12+24V enable

B'light enable

Over Current

Shut down

12V Switched

5,6,7+8 CNS2 10 9

5V

Micro

Periferal supplies,

Tuner, TFT driver etc...

TFT display

24V Switched

CNS1

7,8,9

10

5+6

11

12

CNS1,2 pins 1,2,3

& 4 = Ground

TV Dead / No Backlight Illumination

Front LED working or not

Suspect PSU diagnosis

This should only be used as a guide to faultfinding. I do not accept liability for any inaccuracies. This guide is produced

solely by loudi out of desperation as info on this PCB is non existent - I am just sharing my own findings/ research :@)

Check Voltage

on CNS1 pin 7-9

4.5>5V?

Yes

NO

faulty PSU

Suspect IC2 Q4

BD1 C1 etc..

Check Voltage

on CNS1 pin 10

With TV

switched on

3>5V?

Yes

NO

Main Control PCB Faulty

(Try Hard Reset of Micro)

Check Voltage

on CNS1 pin 5

With TV

switched on

12V? NO

NO

Check Voltage

on CNS2 pin 5

With TV

switched on

Yes

24V?Yes

Check Voltage

on CNS2 pin 10

With TV

switched on

5V? Yes

NO

faulty backlight inverter

Check Fuse F1 (4A250v)

OK Blown

Check Voltage

on CNS1 pin 12

With TV

switched on

0V or

(pulsing)

Pulsing

0V

faulty PSU

Suspect CS21,22,28

R65 Q7 R58 ZD4

faulty PSU

Suspect CRS2

CS19,24,25

faulty PSU

Suspect IC1 check

CS20,23,27

Over

Current

protection