Re: Benq MP624 Beamer LAMP LED RED No Picture

Further the Switching Transistor Q603 pnp was defect because of the short.
Type : PMBS 3908,
If someone needs Manual -I have bought one - too large for upload
now everything is functional.
when someone needs the PS chip TOP247YN I hav one because I ordered 2
when measuring i distroyed it...

C667 47uF 50V had Short on Board 4H.0HU40.A01
See Pics
Ic 651 Was removed because of Damage during Search...
The Beamer showed LAMP LED - RED and the Electronic Ballast did not get an Power over CN603 -0V...

Delta Electronics ADP-30JP Powersupply ADP-30JP used in Netgear FS308
After Powerdown no OUT voltage
Found def CAP 47uF 25V has 4,8uF ESR =>20.0ohm


Helpful was:
[url]https://groups.google.com/forum/#!topic/uk.d-i-y/q7Zg4eESXEE[/url]

A very common failure mode in SMPS's is an electrolytic cap in the startup circuit, causing the PSU
to fail to restart after a power interruption. This is often mis-attributed to mains problems/spikes
etc. as the fault only exhibits after a switch-off, when it then fails to re-start - the...

Re: HP DesignJet 5500 Power Supply

For all who want to repair HP DESIGNJET 5000 5500 Power supply's
Produced by Delta - DPS-386AP PN:2958006202
I repaired 3 Power Supplies' and found 2 relevant -1x 10 (C33) u 1x 47u (C35) bad caps.
I will add some Pictures
There were some other not good Caps - all 10, 22, 47 uF same manufacturer
But it is good to measure ESR (>30 Ohm)

I find a good measuring tool is ESR 70 measurement in circuits is possible
[URL="http://www.peakelec.co.uk/acatalog/jz_esr70.html"]http://www.peakelec.co.uk/acatalog/jz_esr70.html[/URL]...