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

[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?

[nomoresonys]

Is the tv working correctly now?

[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]

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

[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]

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

[hed190]

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

[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

[lotas]

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

[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

[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

[samtron786]

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

Hello
capacitor
ESR 0.85ohm
Vloss=0.8%
48.50uF

[Dannyx]

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

It's unlikely the resistors are bad - they fail open rather than shorted. Something across them, like a capacitor, is shorting them out. You already mentioned a cap is shorted, so how about removing it and checking again ?

[samtron786]

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

Hello
I have 3 pieces here as 0.06 ohm and a capacitor C305 short circuit
R370 -0.06 ohms
R113 -0.06 ohms
R228 -0.06 ohms

what are the resistance values?
where can you order it
many thanks

[elviscen]

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

Hi,
Q211 and R235 are good.
I change the U217 with U300 and now power supply are life again just without backlight.
I ordered new U300 and hope will arrive sone.

[R_J]

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

Start by checking Q211 and source resistor (R228 or R235) note these values are wrong and the resistor is usually around 1Ω. If Q211 is shorted you need to check the gate drive components and likely also replace U217

[elviscen]

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

Hi to all,

I have a Vestel 17IPS20 R9 (071114 R9) that dead after thunderstorm.
I measure all and on the output connector there is on all pins 0V.

Take measurement and have just 400V, measured around 320V.
All components are good, measured all diodes, caps, etc.

I haven't VCC, VCC_MAIN, AUX_M all are 0V.
Where can be the problem?
Maybe need to replace U101, U217, U300???
All three IC's haven't power VCC, all three have 0V.
On IC U217 on pin 8 (HV) I have around 114V.
Also measuring between pin 4 (GND) and pin 6 (VCC) i have 1,3kOhm, regarding some troubleshooting I see than need to be around 730kOhm.

What you suggest?
What can be wrong?
Change the IC U217 or all three IC's?
Something other to verify, change?

Thank you.

[gianniveloce]

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

Thank you for your reply and for this post Dannyx. I replaced U202, C295 and C296. Used 1uF 50V as suggested. TV is now fixed . Yay me, Dannyx and all others that left their comments and thoughts here.

Hi there Old post but looks I have the same issue with mine!!! Thanks.
Caused by a short when backside of the board touched accidentally the TV metal frame and blown the onboard fuse as well as tripped the home el. panel fuse.
I already verified that D112/114 are definitely shorted (by desoldering them) According to schematic they are RL207
C295 and C296 look ok but found some more shorted SMD diodes (Measuring their resistance on the board with Ohmmeter)
D298 Zener looks shorted (C18V)
D213 D111 D307 look shorted as well (1N4148)
Looks also the 3 caps near the input are dead? as measuring with Ohmmeter on board I dont see 'pulling' any voltage
C152 (100nF 275V)
C142 (56n 275V)
C151 (56n 275V)

Would also like to ask if there s anything else to check before ordering/mounting the new components.?
Being an amateur in electronics i accept with pleasure any advice or even critical comment

TIA
GV

[Roktaal]

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

Thank you for your reply and for this post Dannyx. I replaced U202, C295 and C296. Used 1uF 50V as suggested. TV is now fixed . Yay me, Dannyx and all others that left their comments and thoughts here.

[Dannyx]

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

Considering the caps are mostly used for filtering, I assume they're not THAT critical (I used an electrolytic one after all ), so I wouldn't worry too much. Go with what the schematic says.

PS. Damn, I never thought this post of mine would help so many people, or at least not enough for them to thank me Cheers guys.