Re: Zenith DLP Set Not Working After Lamp Replacement
- From: Franc Zabkar <fzabkar@xxxxxxxxxxxxxxxxx>
- Date: Fri, 08 Aug 2008 06:17:20 +1000
On Thu, 7 Aug 2008 11:32:33 -0700, "Chris F." <zappyman@xxxxxxxxxxx>
put finger to keyboard and composed:
So based on that info, I should suspect the power supply isn't supplying
enough voltage to the ballast?
I don't know. If the ballast is drawing too much current, then I
suppose it's possible for the DC supply to sag significantly. BTW,
when I wrote that the 400V supply is not regulated, I should have said
that this supply is derived from the rectified mains and passes
through an active PFC circuit.
Maybe you could insert a 1 ohm 10W series resistor into the DC feed to
your ballast and measure the voltage drop across it. That would tell
you the current draw.
"Franc Zabkar" <fzabkar@xxxxxxxxxxxxxxxxx> wrote in message
news:54vk94hpn36dfpbi60hubbm3at0s70v8rq@xxxxxxxxxx
On Wed, 6 Aug 2008 14:16:16 -0700, "Chris F." <zappyman@xxxxxxxxxxx>
put finger to keyboard and composed:
I posted a message about this a few weeks ago, regarding replacement of
the blown lamp. After installing the new lamp, the set still won't start
up;
the "replace lamp" error light flashes instead. Checking the power input
to
the H.V. power supply (or lamp ballast I suppose), I measured a peak of
over
300 VDC initially but it quickly drops to (and stays at) about 160. The
450
volt electrolytic cap connected across the power input suggests that the
operating voltage should be much higher than 160.
So what now? Is this a ballast problem or something on the main power
supply? I can't afford to gamble any more money on this thing.
The model and chassis numbers BTW are E44W46LCD and MB-042B
respectively.
FWIW, I have a service manual for an LG MB-042C chassis.
The DC supply voltage for the ballast is 370 min, 390 typ, and 410
max. This is derived from directly across the main 220uF/450V bulk
capacitor (C820). It is not regulated.
The parts list includes ...
6913V00002C BALLAST, EUC100 P/11 PHILIPS 100W POWERPACK BALLAST FOR
LCD
6912V00006C LAMP, HIGH PRESSURE MECURY UHP 100W 1.0 PH P22 PHILIPS
100V 1A RN48SZ40H
- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
.
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