Zenith DLP Set Not Working After Lamp Replacement
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From: Chris F. on 11 Aug 2008 14:23 Franc, you're not going to believe what was wrong the whole time.... I hadn't yet replaced the cover to the lamp compartment, and last night I realized there was a switch under that cover to sense when it was open. Replaced the cover and the set works fine! Can't believe I was so dense as to not realize that right from the start, instead of going on this wild goose chase. I should have realized that the toughest problems often have the simplest solutions. I still thank you for your help though, it's good to know there are folks out there to help me when I really do need it. "Franc Zabkar" <fzabkar(a)iinternode.on.net> wrote in message news:khju94lcscs4v9qecc4os8v0rs2c9bj7j5(a)4ax.com... > On Sun, 10 Aug 2008 12:51:46 -0700, "Chris F." <zappyman(a)hotmail.com> > put finger to keyboard and composed: > >>You're right, and I should have realized that a long time ago. > > I was thrown by the fact that all the voltages were at 40%. You would > normally expect that all rails would be at 0V apart from a single > standby supply. > >>Shorting those pins did power the PSU and all voltages are now normal ... > > If the ballast supply is now at 400V, then this would imply that the > PFC and voltage doubling function of IC810 is turned off in standby > mode and turned on in run mode. This begs the question, how does IC810 > know that the set is in standby mode? Perhaps this is the function of > pin 5? > >>... but the lamp still does not come on. > > The uP on the Tuner Board appears to control and sense the lamp via > connector P10. BTW, when you shorted pins 1&2 of PB41, I hope you > removed the connector, otherwise one of the uP pins would have been > subjected to 16V. > >>I guess the next step is to test the ballast, but >>for that I need the pinout, and eserviceinfo is still down....... > > I have uploaded tuner PCB circuit 2-of-2 to my web space: > http://www.users.on.net/~fzabkar/MB-042C/ > > It seems to me that if you can't get the set to come out of standby, > then the M37151 uP (IC1) may be faulty, in which case your lamp > problem may be a secondary issue, if it is in fact a problem at all. > > - Franc Zabkar > -- > Please remove one 'i' from my address when replying by email.
From: Franc Zabkar on 11 Aug 2008 16:03 On Mon, 11 Aug 2008 11:23:04 -0700, "Chris F." <zappyman(a)hotmail.com> put finger to keyboard and composed: > Franc, you're not going to believe what was wrong the whole time.... I >hadn't yet replaced the cover to the lamp compartment, and last night I >realized there was a switch under that cover to sense when it was open. >Replaced the cover and the set works fine! Can't believe I was so dense as >to not realize that right from the start, instead of going on this wild >goose chase. I should have realized that the toughest problems often have >the simplest solutions. I suppose one day you'll look back on this job and laugh about it. I learned a lot in any case, so my time wasn't wasted. - Franc Zabkar -- Please remove one 'i' from my address when replying by email.
From: Chris F. on 12 Aug 2008 14:19 I might not be out of the woods just yet.... although the set is working, the remote isn't responding and I can't get a universal remote to work either. The service manual does not include the control panel board so I have no way to trace the remote signal. I'm not sure what to do now, I'm worried that this may be something I caused while I had the set apart....... "Franc Zabkar" <fzabkar(a)iinternode.on.net> wrote in message news:2n51a4h67c20g6uvsfpas5ic2mf9cis2tl(a)4ax.com... > On Mon, 11 Aug 2008 11:23:04 -0700, "Chris F." <zappyman(a)hotmail.com> > put finger to keyboard and composed: > >> Franc, you're not going to believe what was wrong the whole time.... I >>hadn't yet replaced the cover to the lamp compartment, and last night I >>realized there was a switch under that cover to sense when it was open. >>Replaced the cover and the set works fine! Can't believe I was so dense as >>to not realize that right from the start, instead of going on this wild >>goose chase. I should have realized that the toughest problems often have >>the simplest solutions. > > I suppose one day you'll look back on this job and laugh about it. > > I learned a lot in any case, so my time wasn't wasted. > > - Franc Zabkar > -- > Please remove one 'i' from my address when replying by email.
From: Art on 12 Aug 2008 10:52 "Chris F." <zappyman(a)hotmail.com> wrote in message news:48a19c74$0$4011$9a566e8b(a)news.aliant.net... > I might not be out of the woods just yet.... although the set is working, > the remote isn't responding and I can't get a universal remote to work > either. The service manual does not include the control panel board so I > have no way to trace the remote signal. I'm not sure what to do now, I'm > worried that this may be something I caused while I had the set > apart....... > > "Franc Zabkar" <fzabkar(a)iinternode.on.net> wrote in message > news:2n51a4h67c20g6uvsfpas5ic2mf9cis2tl(a)4ax.com... >> On Mon, 11 Aug 2008 11:23:04 -0700, "Chris F." <zappyman(a)hotmail.com> >> put finger to keyboard and composed: >> >>> Franc, you're not going to believe what was wrong the whole time.... I >>>hadn't yet replaced the cover to the lamp compartment, and last night I >>>realized there was a switch under that cover to sense when it was open. >>>Replaced the cover and the set works fine! Can't believe I was so dense >>>as >>>to not realize that right from the start, instead of going on this wild >>>goose chase. I should have realized that the toughest problems often have >>>the simplest solutions. >> >> I suppose one day you'll look back on this job and laugh about it. >> >> I learned a lot in any case, so my time wasn't wasted. >> >> - Franc Zabkar >> -- >> Please remove one 'i' from my address when replying by email. > >Did you reset the lamp timer so it will not remind you in two months to put >another lamp into it?
From: Franc Zabkar on 12 Aug 2008 16:36
On Tue, 12 Aug 2008 11:19:28 -0700, "Chris F." <zappyman(a)hotmail.com> put finger to keyboard and composed: >I might not be out of the woods just yet.... although the set is working, >the remote isn't responding and I can't get a universal remote to work >either. The service manual does not include the control panel board so I >have no way to trace the remote signal. I'm not sure what to do now, I'm >worried that this may be something I caused while I had the set apart....... Pins 1,2,3 of P2 are where the IR sensor connects to the tuner board. See http://www.users.on.net/~fzabkar/MB-042C/Tuner_UL.jpg If you've disconnected P2, then you'll also have disconnected one of the I2C buses. - Franc Zabkar -- Please remove one 'i' from my address when replying by email. |