Yeah good luck ! A friend had one a decade ago and we could not find any service manuals back then, only a very simple user guide iirc.

silvervest wrote on 2021-09-04, 09:44:

Hey folks, […]
Show full quote

Hey folks,

I'm looking for a service manual or schematics for the Compaq Presario 425/433 series, specifically the power supply board. My unit seems to power on for a second then loses power to the PC, but the high voltage for the CRT is working fine.
Can't see anything obvious, so want to refer to schematics/manual to get some better ideas.

I've had what I'd consider to be a pretty good googlin' and can't find anything for this model. The power board screams Philips CRT manufacture to me just based on the layout and silk screen markings, but I don't seem to be able to find an equivalent and none of the ID numbers on the board come up with any good results.

Thanks in advance!

Hi! I have the same issue with my 425. Did you solve the problem? Thanks Börre from Sweden

silvervest wrote on 2021-09-04, 09:44:

Hey folks, […]
Show full quote

Hey folks,

I'm looking for a service manual or schematics for the Compaq Presario 425/433 series, specifically the power supply board. My unit seems to power on for a second then loses power to the PC, but the high voltage for the CRT is working fine.
Can't see anything obvious, so want to refer to schematics/manual to get some better ideas.

I've had what I'd consider to be a pretty good googlin' and can't find anything for this model. The power board screams Philips CRT manufacture to me just based on the layout and silk screen markings, but I don't seem to be able to find an equivalent and none of the ID numbers on the board come up with any good results.

Thanks in advance!

Borre79 wrote on 2025-06-12, 20:18:

Hi! I have the same issue with my 425. Did you solve the problem? Thanks Börre from Sweden

No, sorry. It's been in storage for years now, I should dig it out and have another run at it though!