Dead Vestel 17IPS20 power supply repair (OK fuse, no shorts)

[samtron786]

Re: Dead Vestel 17IPS20 power supply repair (OK fuse, no shorts)

I desoldered the resistors and now the values
R320
00.6 ohms
R113
00.6 ohms
R228
0.7 or 0.8 ohms
I have a digital multimeter

[hed190]

Hello, sorry for dig up this old thread but i need help with mine Vestel 17IPS20P.

I only have 320v on the capacitors so i think the PFC circuit isnt running cause it should be around 400V, i don't have VCC_MAIN, VCC_M, VCC, nothing...

i've tested a lot of components found Q211, R228 and U202 blown so i've changed them and still no voltages....

The only short that i don't even know if it's a short is on pin 6 of U202 (SENSE (CS_M)), its normal beeping to ground on this?

Thank you

[lotas]

Yes, normally on CS there is a low resistance resistor (current sensor) on the ground.

[hed190]

Yes, normally on CS there is a low resistance resistor (current sensor) on the ground.

Thanks, so i really don't know what's going on with this board

[hed190]

So... I fixed it, was the new chip 6742HR that possibly came damaged from factory... now i have all my voltages

[nomoresonys]

Good job, there's a good reason to always get at least 2 of what you need.

[hed190]

Good job, there's a good reason to always get at least 2 of what you need.

Thank you, i have 110v on the output V_LED+ that goes to the connector CN500, it's probably right, right? 110v for all leds...

[nomoresonys]

Sounds about right, many times you will see a legend on the powerboard with expected voltages for it.

[hed190]

Sounds about right, many times you will see a legend on the powerboard with expected voltages for it.

This one doesn't have voltages marked in any part of it, thank you

[nomoresonys]

Is the tv working correctly now?

[hed190]

Mine i guess is entering Over Voltage Protection, maybe isn't suppose to have that much voltage on Leds connector, maybe only 80v, ive tried manipulating some resistors on ovp pin of the leds driver but till now no success.
Any ideas?