Réparez vos affaires Communauté Boutique

Options

Why logic board chimes when pin is touched with probe?

Hello Guys,

Maybe one of you can help with this unusually weird problem I have with my 820-2330 logic board. The board powers on, but won't chime or boot until I touch a couple of specific pins on chip U8900. This is what happens exactly; when the board is powered on and I touch pins VO or OCSET on U8900 the board then chimes and boots normally. It is driving me crazy trying to figure this one out. At first I replaced U8900, then I replaced both FETS, then I replaced the Critical caps after the inductor all to no avail. Any help would be appreciated.

Thanks,

Roger

Répondre à cette question J'ai le même problème

Cette question est-elle utile ?

Oui Non
Indice 0
Ajouter un commentaire

1 Réponse

Filtrer par :
Les plus utiles Les plus récentes Les plus ancien(ne)s

Options

Look for an open trace or bad component attached to one or both of the pins you mentioned. If an input pin is not connected, touching it with a logic or scope probe connects it to ground through the probe circuit, thereby giving it a logic low (“0”)signal.

Cette réponse est-elle utile ?

Oui Non
Indice 0
Ajouter un commentaire

Ajouter une réponse

Roger sera éternellement reconnaissant.
Nombre de vues :

Dernières 24 heures : 0

7 derniers jours : 0

30 derniers jours : 0

Total : 54