Mulja tv repair portal

Equipment Repairs => PLASMA TV forum => Topic started by: Geoff S on December 02, 2011,09:06:28

Title: BN44=00189A low 5v
Post by: Geoff S on December 02, 2011,09:06:28

Hi all

Any body got a suggestion for this fault on a sammy psu bn44-00189a

Low 5v standby giving a totally dead set. I've checked all the kit parts plus changed the viper22 chip. The voltage is low at 3.29v. Pulled all external connections and the voltage remains low. Also replaced 22uf in that circuit. No s/c fets or transistors.

Can't find a diagram for this psu

Help or advice would be greatly appreciated.
Cheers
Geoff

Title: Re: BN44=00189A low 5v
Post by: watteau on December 02, 2011,11:13:13

Hi,
I think the attached circuit might be similar.
I would check the feedback circuit, ICB851 and associated components.
Regards
John

Title: Re: BN44=00189A low 5v
Post by: Geoff S on December 02, 2011,13:13:04

Quote from: watteau on December 02, 2011,11:13:13

Hi,
I think the attached circuit might be similar.
I would check the feedback circuit, ICB851 and associated components.
Regards
John

Cheers John. Here's hoping. Thanks for the diagram.
G