Stuck in Standby - 17PW20 V2 (260707) PSU

[StormyC]

Hi folks,  im hoping for a little assistance.

I have an Acoustic solutions TV LCD32761HDF stuck in standby, solid standby light.  After some searching it looks like its the 17PW20 V2 PSU that is at fault.  Ive removed the board and can see a 100u 50v capacitor (C835) that has a bulge so i need to replace that, however, what i dont know is should i replace anything else prior to testing after i replace C835... Any advice on what to test (and how) would be greatly appreciated.

Incidentally, ive taken a reading accross the large capcitor C819 and its 320v but the circuit diagram indicates 400v - does this indicate somthing else is wrong?

Many thanks..

[Ohm Supplies]

"After some searching it looks like its the 17PW20 V2 PSU that is at fault."

Do you mean you serched for the psu or searched for the fault?

regards
ANdy

[StormyC]

I did a search on the internet for the common cause of this fault. So I'm assuming the faulty part is going to be the psu. I did think that the bulging capacitor was the give away.... Am I wrong.should I look else where...?

[digitech1962]

would get psu repair kit from ohm supplies  or Charles Hyde but fault can be AV board good luck Dave.

[jimca007]

had them as low as 300v at the smoothing block and they've still run the voltage at the smoothing block i assume will be proportional to the ac input voltage . stick a new cap in and check for the relative output voltages if you've a diagram it'll show how much and where about the only good thing with most vestel psu's is you usually get away with not having to load them to test them... good luck SMPS's can be a pig but you might well be lucky

[chrissie jones]

have you checked the blue cap c877/878..15nf.630v.normely they buldged on the sides,so you need to take them out to check..

[StormyC]

Thanks very much for the replies.

Just looking at those blue caps you mention - they look fine - just the C835 that looks bad.  When I get the chance I will replace it and see what happens. (working all hours atm - even at work now!).

Again thanks all.

[StormyC]

A quick Question regarding the circuit for the power supply.

The pin outs - so Im sure of what im testing - pins for PL801 1 thru 5 are 24V and 6-10 are ground?

Very much a novice so any help appreciated.

[Bambooz]

Yep. They just used multiple thin wires instead of one large one to deliver the same amount of current.

[StormyC]

Me again....

OK, as the power supply had that visibly bad cap I replaced it but I wasnt able to get anything out of the 5v pin(s) so instead of paying £25 ish for the kit i went ahead and bought a new power supply, the exact model, 17PW20 V2 (£35), popped that in but still have the exact same fault  .

Im confidant that the new power supply is working fine as I was able to get all the readings correct.....  I think it was because of my noobness that didnt test the old one properly....

OK the BIG question: Is this TV a scrapper, is there somthing else easy to check or should I take it to a pro?

 

[jimca007]

what main boards in it mate sometimes the vestel 's suffer from processor failure so could weel be that or a duff eeprom give us the number and ideally a pic and maybe me or one of the other similar old farts ( no offense Chris ! ) will have one you can try for p&P cheers

[StormyC]

 

Thanks!!

I will do that later today, would be nice not to shell out for brand new TV...

[StormyC]

Pictures, as promised...

Hoping you can help...

[Turnip]

Hi Jimca,

No offense - But just a wee phart (You can never trust 'em, these days) - Chris

[jimca007]

17MB22-2 Pcb Main (32 inch) Hitachi L32HP01U .....
CHS Part No.: 12029ZW
Availability: 7-14 Days
£ 238.82

ouch!
I'll have a look later see if i've got one cheers