How to find problem on vl470m will not power up

I doubt the issue will be the regulators if you have the correct voltage on them.
Check where the hum is coming from.
What frequency is the hum; 50/60HZ = mains hum = bad ground. 100/120HZ = power supply hum.
Affected by a control somewhere maybe.

Blue Star ac error code u8 display what is problem ?

12 volt DC 2500 mA

Bonjour cher ami, vous pouvez revenir aux réglages par défaut en appuyant avec un point vert ("Qual-+/-") simultanément pendant quelques secondes.
Pour réinitialiser les paramètres personnalisés que d'autres: se déplacer U1 ou U2 le commutateur de mode U1 ou U2, appuyez sur Menu et vérifier U1 ou U2 Ok sélectionnez Restaurer, cliquez sur OK.

Regards

the motor will have 3 pairs that can be checked with a ohm meter for continuity. each pair has a start and a finish. usually it would be labelled U1 V1 & W1 for the start and U2 V2 & W2 for the end or finish.

To connect in star ( Motors that start with direct load ) supply cables to U1 ( Red ) V1 ( White ) W1 ( blue ) and bridge out U2 V2 & W2.

To connect in delta Supply cables as above. Bridge U2 to V1 - Bridge V2 to W1 - Bridge W2 to U1.

If you have a reversed winding the motor will growl and not turn.
To reverse direction of rotation swap any 2 supply cables ( But only when the power is OFF )

You have a diode arrangement in your power supply that converts the AC power to DC power so that it can be stepped up to operate the high voltage power supply of the set. If those diodes are blown, which happens frequently in a storm, then you have no voltage to your high voltage. You are going to have to check that diode arrangement by making a continuity check both ways on each diode. A diode blocks voltage one way but lets it pass the other way, thus producing a DC voltage.

Hello
It is very give you advice as you are aware of it. So do one thing. As far as the device is not turns on its power, the fault should be somewhere around the power supply system. Begin from AC mains chord itself. Check it for any break. If it is Ok, check whether supply is comming inside to your TV. Normally TVs have DPST type [Double Pole Single Throw] switches used for power switching. If any one of its poles not get correct contact inside, either phase or neutral will be cut. The click sound is not considered for its correct function. Check it also. It can be ckecked by measuring the voltage comes at rectifier points of your TVs power supply regulator section. If there is voltage, check the DC voltage across main filter capacitor. It must be some more than of your supply votage. I don't know the exact voltage you have as mains supply. Here in Idia, we have 220VAC 50Hz. At this supply voltage, DC voltage said above will measure more than 340VDC. Get a comparison with this when you check the voltage at the point mentioned above.
If it is also ok, there may be some fault in the oscillator section of the SMPS [Switched Mode Power Supply] section. There may be transistors or an Ic may be used to make oscillation to drive the switching transistor, which in turn drives the swiching transformer to get proper secondary low DC voltages needed to the circuit board. Check all the transitors. Of optocoupler is used check it also. Check its DC side control drive transistors.
Check all the zener diodes "off circut". ie take it out desoderd and check it with multimeter [preferably analogue type], set to 100K range. There should not be any leak at all. It is best to replace them.
Check all the resistors for its value marked, and all the transistors either for short or open.
Ok.

If your Ideapad is the U3 or U5 version just pop in the disk that you have bought and it will autostart.
If your Ideapad is the U1 or U3 (so it doesn't have optical unit) and you have bought the boxed version then your only option is to copy the content of the disk to a USB stick and run the setup from there.

Xerox 6110 Code Description A1-1 to A1-32 All indicate a paper path problem, etc. in the ADF A2 ADF exit problems A3 Irregular size documents A5 ADF interlock A6 ADF single sheet document reset A7 Platen interlock A8 ADF exit interlock C1 Tray 1 jam C2 Tray 2 jam C3 Tray 3 jam C6-1, C6-2 Jams related to duplex C6-3 Registration sensor, re tray 1 C7-1, C7-2 HCF feed problems C7-3 Tray 1 feed problem C8 Paper stays in tray or duplex or HCF C9 Bypass feed problem E1-10 to E1-25 Internal jam E1-6 Paper on registration sensor E2 Reset signal happened. Might read E-2 something else E3-30 to E4-14 Exit jam E3-6 Exit jam E4-10 to E4-14 Inverter sensor not actuated E4-15 Inverter sensor E4-40 to E4-45 Duplex entry sensor E4-6 Inverter sensor E5 Front door interlock E6-1 Tray 1 interlock E6-2 2 tray or duplex interlock E6-3 HCF interlock E7-2, E7-3 Duplex interlock E8-6 to E8-15 Duplex entry sensor F1-1 Sorter entry sensor F1-6 Sorter exit sensor F3 Paper size not available for sort/stack F5 Sorter interlock J1 Add toner J3 Replace copy cartridge J7 Replace copy cartridge J8-1 Wrong copy cartridge installed J8-2 Copy cartridge EEPROM L6 Auditron or other counter problem L8 Platen glass temperature is too high L9 Communication problem between interimage erase/edge lamps and main board U1-1 Main motor drive problem U2-1 to U2-4 Scan home sensor U3-1 Lens sensor U4-1 Open fuser thermistor U4-2 Fuser did not warm up properly U4-3 Fuser temperature too high U4-4 Fuser problem. Staying on too long U4-6 High fuser temperature U5-1 Sorter bin home switch not activated U5-2 Sorter bin home switch stayed actuated U5-3, U5-4 Sorter bin home switch U6-1 ROM problem U6-2 RAM problem U6-3 Low battery U6-4 Incorrect value in NVM. Reinitialize main board with code 20-96 U8-1 to U8-6 Problem with exposure lamp, lamp sensor, lamp board