OKITVV37TD stuck in stand by (17PW20 & 17MB22-2) yet another vestel

[Blanqui]

Hello guys.

This is my first post asking for help.
Last week this TV came in. It has the power supply 17PW20 and the mainboard 17MB22-2.
The set's led was intermitent and would not start.
Since I know those powerboards are bad, I ordered a new one from my provider. When I got the new board, the set still doesn't work. Now I have a fixed lit led and nothing else works.

Any ideas?

Thank you!

Blanqui.

[tom66]

Re: OKITVV37TD stuck in stand by (17PW20 & 17MB22-2) yet another vestel

Try replacing EEPROM, you can use a blank one on this chassis.

Not continuous blink from LED? Just solid, in standby? What does set do if you press power button?

[Blanqui]

Re: OKITVV37TD stuck in stand by (17PW20 & 17MB22-2) yet another vestel

Yes, the led is just solid and I have all stby voltages ok.
If I press any button the set does absolutely nothing. I can see the voltage variations on switch board but nothing else happens.
I don't have a blank eeprom now for this set. Will have to order some.
Any other things to try in the meantime?

Thank you!

[tom66]

Re: OKITVV37TD stuck in stand by (17PW20 & 17MB22-2) yet another vestel

17PW20-1 sch


When you plug in set, stby voltages come up. Then self test begin. ST_BY pin 6 PL803 should change state (cannot remember if high or low), voltages from PSU come up and then after a second or so it turns off and sits there in standby. Then you can turn it on with button or remote. Usually if self test fails you get continuously blinking LED. But maybe older main board will just shut them off.

I do have a working 17PW20-1 board in a 37" Sanyo I'm working on right now. Can get you a few measurements on that if you need. It works fine, but the inverter has a fault.

[Blanqui]

Re: OKITVV37TD stuck in stand by (17PW20 & 17MB22-2) yet another vestel

Yes, when the power button is pressed, all voltages come on briefly for a second or so, then only remain the stby ones.
Pin 6 goes from 0.4 (at power on) to 1.8 on stand by.
Pin 5 stays at 2.7. It should be error_det. But I don't know if high means error or not.

[tom66]

Re: OKITVV37TD stuck in stand by (17PW20 & 17MB22-2) yet another vestel

So, the voltages are all good briefly? Corrupted EEPROM or bad main board then. The main boards in most Vestel sets are fairly reliable, though...

[Blanqui]

Re: OKITVV37TD stuck in stand by (17PW20 & 17MB22-2) yet another vestel

Let's hope it's a bad eeprom, if not, after replacing the power supply, customer won't accept the repair quote.

So no more for now, time to go to have lunch and enjoy the weekend :p

Thank you for everything!

Blanqui.

[Blanqui]

Re: OKITVV37TD stuck in stand by (17PW20 & 17MB22-2) yet another vestel

Hello again.
I've just replaced the eeprom and the status hasn't changed.
The set does the same, steady led lit.
Is there anything else I might try?
Thank you!

Blanqui.

[tom66]

Re: OKITVV37TD stuck in stand by (17PW20 & 17MB22-2) yet another vestel

Check all voltage regulators on the main board and DC-DC if they have any, post a picture if unsure.