Text preview for : FPS212-3F01- Diagnostic check.pdf part of Hannspree JT01 32E2 PSU block Diagram and fault diagnosis guide, produced by myself, loudi - use at you own risk - please be carefull as mains voltages are present.
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PSU 230V AC 5Volt Always on PSU CNS1 7,8,9
10
5V
Main Control PWB Infra Red Receiver Micro
12+24V enable 5V=on, 0V=off 12V Switched
12V + 24V switched Power supply
5+6
11 B'light enable 12 Over Current Shut down
Front LED
5,6,7+8 CNS2 CNS1,2 pins 1,2,3 & 4 = Ground 24V Switched
10 9
Periferal supplies, Tuner, TFT driver etc...
Backlight Inverter TFT display
230V AC
Check Fuse F1 (4A250v) OK Blown
TV Dead / No Backlight Illumination Front LED working or not Suspect PSU diagnosis
Check Voltage on CNS1 pin 7-9
faulty PSU Suspect IC2 Q4 BD1 C1 etc..
faulty PSU Suspect CS21,22,28 R65 Q7 R58 ZD4
4.5>5V?
NO
Yes Check Voltage on CNS1 pin 10 With TV switched on
NO
3>5V? Yes Check Voltage on CNS1 pin 5 With TV switched on Check Voltage on CNS1 pin 12 With TV switched on
12V? Yes Check Voltage on CNS2 pin 5 With TV switched on Check Voltage on CNS2 pin 10 With TV switched on
NO
0V or (pulsing)
0V
Pulsing
Yes
24V? NO faulty PSU Suspect CRS2 CS19,24,25
Over Current protection
5V? NO Main Control PCB Faulty (Try Hard Reset of Micro)
Yes
faulty backlight inverter
faulty PSU Suspect IC1 check CS20,23,27
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 :@)