[TechAssist] Re: RCA HDLP50W151 SHUTDOWN
- From: "tvservice" <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 23 Aug 2004 14:02:04 -0500
Jonas,
the following is from RCA troubleshooting guide on website
Robert
DLP Light Engine
The following information describes the normal
start-up and cool down sequence of the DLP Light
Engine. Understanding how the light engine starts
and stops will help in troubleshooting the instrument.
Turn-on Sequence
1. AC Plug In:
A. Relay K24251 located on the ACIN board
clicks indicating that standby supplies, +/-
5VS, +6VS +33VS, are up and the 300 V
supply is present at connector X1 on the
Light Ballast power supply.
B. Power LED and Porch Light illuminate:
DM2CR software is booting up, this takes
approximately 30-45 seconds.
C. Power LED Off: DM2CR has successfully
booted up and is in standby mode.
2. Press Power On: Power LED turns on and the
DM2CR internal relay clicks.
3. The ACIN run supplies are turned on (5VR,
9VR,12VR). These are fed from the ACIN board
(P24702) to the formatter board (BP503). The
formatter board generates 3.3VR and routes it
along with the other run supplies on connector
BW902 to the light engine connector P1. These
voltages can be measured at connector BW902 on
the formatter board: Pin 2 (5VR), Pin 3 (Power_Good
~ 3.3Vdc), Pin 5 (2.5VR), Pin 9 (3.3VR) and Pin 12
(12VR).
4. The Color Wheel starts turning taking
approximately 3 seconds before it locks in @ 7200
RPM.
5. The lamp_en signal, 5Vdc, on the Light Engine
driver board J4 (4), is sent to the lamp ballast board
DLP Service & Troubleshooting
which strikes the lamp. It takes approximately 10-
20 seconds for the lamp to reach full brightness.
The DC voltage decreases to 2.5 ~ 3.25Vdc.
6. The Lamp and DLP fans turn On. The DM2CR
micro reads the Ballast_lamplit input pin J4 (1) on
the light ballast. This signal comes from the ballast
and indicates that the lamp has started successfully.
When the DM2CR micro detects this signal, it then
"passes" it along to the DDP1010 by writing the
User_Lamplit signal. The fans are turned on by
DDP1010 writing the "high pulse width" bytes to
PWM0 (Lamp fan) and PWM1 (DLP fan). The
connectors J1 (1) (Lamp Fan) supplies 8 Vdc to
cool the bulb. The DLP fan is connected to J7 (1)
(DMD Fan) and supplies 8 ~12 Vdc to operate.
7. Video should now be present on the screen.
BW902-Formatter P1-Light Engine
Description Pin # Voltage Pin #
Ground 1 0 12
5 VR 2 5 Vdc 11
Power Good 3 3.3 Vdc 10
Ground 4 0 9
2.5VR 5 2.5Vdc 8
2.5VR 6 2.5Vdc 7
Ground 7 0 6
Ground 8 0 5
3.3VR 9 3.3Vdc 4
3.3VR 10 3.3Vdc 3
Ground 11 0 2
12VR 12 12Vdc 1
J4 Connector-Light Engine
Pin Description VDC
off
VDC
At turn-on
VDC
run
1 Ballast Lamp Lit L H (5v) L
2 Ground L 0 0
3 5VR 0 5 5
4 Ballast Enable Line 0 5 2.5~3.25
5 5VR 0 5 5
Lamp Cool Down Sequence
There are three timers associated with the cool
down procedure.
1. The first, a standby timer, is engaged when the
power off command is received. The video & audio
are muted leaving the power supplies and fans on
for 20 seconds. The screen turns blue and slowly
fades out even though the bulb is still lit. During this
20 second interval the user can immediately turn
the set back on.
2. Second after the standby timer expires the lamp
is turned off and the instrument enters the Cool-
Down Mode. When the lamp is turned off, the user
will not be allowed to turn the set on for 30 seconds.
During this 30 seconds the run supplies and Lamp
fan continue to run cooling the lamp. If a Power On
command is received before the 30 second cool
down timer has expired, the Power LED will blink
slowly. After this timer expires the unit will start
normally. If there is a power loss after the power
has been restored this 30 second timer is also
activated.
3. The final cooldown timer is a two minute timer
that allows the Lamp fan to continue to run cooling
the lamp after the standby timer expires and the
lamp is turned off.
hth
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "jonas miglinas" <miglinasj@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, August 23, 2004 7:07 AM
Subject: [TechAssist] Re: RCA HDLP50W151 SHUTDOWN
> Hi Jeff,
>
> I can hear the whine of the color wheel. But I don't know enough about
these
> sets to tell.(only second set that I've seen)
>
> Jonas Miglinas
> Miglinas TV
> Chicago
> ----- Original Message -----
> From: "Jeff Farnsworth" <jlfonz@xxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Sunday, August 22, 2004 10:37 PM
> Subject: [TechAssist] Re: RCA HDLP50W151 SHUTDOWN
>
>
> > Can you hear the color wheel? If so--is it to loud. Set might not be
> able
> > to sync up with color wheel thereby causing shutdown. Replace light
> engine?
> > Samsung won't fire at all (light) if color wheel don't sync up.
> >
> > TV Doctor
> > Avalon, Wi
> >
> > ----- Original Message -----
> > From: "jonas miglinas" <miglinasj@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Sunday, August 22, 2004 5:49 PM
> > Subject: [TechAssist] RCA HDLP50W151 SHUTDOWN
> >
> >
> > > Hello all,
> > > Repaired this set a month ago and it's back to haunt me again. This
time
> > it's come in dead with standby voltages ok. Changed the DM2 board and
the
> > set fires up, but shuts down after ~ 20 seconds, after 20-30 seconds it
> > starts up again runs for about ~20 seconds and keeps repeating this
> pattern.
> > The fans don't even attempt to turn, so I suspect this is the problem. I
> > just can't seem to locate the fans on the cd schematic so I can trace
> where
> > the problem is. Either I'm going blind or can this be a board
replacement
> > problem?
> > > Thanks for any advice.
> > >
> > > Jonas Miglinas
> > > Miglinas TV
> > > Chicago
> > >
> >
>
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