Author Topic: Vestel 17PW22 - Standby rails on and off  (Read 2886 times)

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tom66

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Vestel 17PW22 - Standby rails on and off
« on: December 13, 2011,16:19:50 »
Ugh. I HATE these Vestel PSUs. I've been trying to fix this one more as a project than anything else, because I feel like buying a new one would be giving up. It seems every time I fix something 10 more issues rear their head.

Anyway: After fixing lots of little things... such as the 15n/630V caps, the caps around the PWM controller, the caps around the LM317T, the caps around the standby controller, a few cold joints and finally getting a decent PFC voltage (388V), I put the unit down to rest for a few days. I plugged it into the TV today, and find the 5V rail is bouncing from 0V to 5.06V every second, as are the other rails. Tested it with a scope, it seems like it switches on and then switches off every second. The LED on the front blinks in time with this bouncing. I can hear a buzzing sound when the LED is lit, and nothing when it is not lit.

I have a junk 17PW20 with a dud PFC inductor (just replaced with wire as a temporary standby fix) which only gives standby power and that voltage is stable. So why isn't this one?

Any insight would be much appreciated, would be great to get this TV working before Xmas.

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Vestel 17PW22 - Standby rails on and off
« on: December 13, 2011,16:19:50 »

E Parton

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Re: Vestel 17PW22 - Standby rails on and off
« Reply #1 on: December 13, 2011,16:30:14 »
You don't say which 17PW22 board you have ?
There are several versions ..each with their own particular issues ..
can you be more specific ..
Andy probably has a suitable kit ...but without knowing which Rev it is ?
rgds
Evan

tom66

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Re: Vestel 17PW22 - Standby rails on and off
« Reply #2 on: December 14, 2011,03:05:19 »
My error. It's actually 17PW20.1. I keep getting confused by all of the 17PW series of power supplies...

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Re: Vestel 17PW22 - Standby rails on and off
« Reply #2 on: December 14, 2011,03:05:19 »

E Parton

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Re: Vestel 17PW22 - Standby rails on and off
« Reply #3 on: December 14, 2011,06:11:54 »
Hi Tom ..
Sounds like you have already replaced the most likely components ..
From memory ...as I dont have a board to look at ..
There is is also a small transistor about the same size as the LM317 (possibly a BCXXX ?)
and 4 electroytics suspect including a 220uf ..100uf and a 33 uf ...can't rememer the last one or the circuit references
possibly a 1uf or maybe 10uf ..

I suspect there is a kit for this ...but you appear to have changed most of the suspect components that are in the kit.
rgds
Evan

balasahu

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