Re: DLP
- From: Jamie <jamie_ka1lpa_not_valid_after_ka1lpa_@xxxxxxxxxxx>
- Date: Mon, 28 Apr 2008 18:11:53 -0400
GregS wrote:
In article <gunRj.9380$E77.5795@trnddc05>, "James Sweet" <jamessweet@xxxxxxxxxxx> wrote:Ha, Sounds like you have an RCA 61 inch? , that is what my DLP is. and it cost that much for a replacement lamp assembly..
"GregS" <zekfrivo@xxxxxxxxxxxxxxxx> wrote in message news:fv4nmp$55n$1@xxxxxxxxxxxxxxxxxxxxxxxxxxxx
Working on a DLP projector, no light. I don't measure any voltage
going to a lamp socket with lamp disconected. I looked for both AC and DC.
Looks like there is a ahole board for the supply with OSRAM parts.
Anything else to check ?
greg
You could find the signal line that triggers the lamp driver to turn the lamp on and make sure it's changing states when the lamp should light.
Be *very* careful probing the lamp sockets on these, a properly working driver will supply pulses of several kilovolts to ignite the arc in the lamp. You can easily fry your meter, or worse.
The drivers are essentially switchmode power supplies configured to supply a constant current rather than a constant voltage. Standard SMPS troubleshooting applies, taking into account the greater than usual high voltage hazard.
I used an old analog meter. There is a LED lamp on indicatior on the top of
the unit, and it does go on. Evn if I just had a bad lamp, I would imagine there would
still be a clicking or visable arc around the lamp. $435 for a new lamp, wow.
greg
Your problem sounds like a ballast/driver problem.
--
http://webpages.charter.net/jamie_5";
.
- Follow-Ups:
- Re: DLP
- From: GregS
- Re: DLP
- Prev by Date: Re: Function of component in flash tube trigger circuit?
- Next by Date: Re: Intermittent fault in Eizo 19" T766 CRT
- Previous by thread: Re: DLP
- Next by thread: Re: DLP
- Index(es):
Relevant Pages
|
