[TechAssist] Re: RCA HDLP50W151 SHUTDOWN
- From: "jonas miglinas" <miglinasj@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 23 Aug 2004 20:37:33 -0500
Thanks Robert,
I saw that at the website and thats what made me decide to take it in to the
shop.(that and to get away from a client that won't stop looking over my
shoulder)
Your suggestion is apreciated.
Jonas Miglinas
Miglinas TV
Chicago
----- Original Message -----
From: "tvservice" <tvservice@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, August 23, 2004 2:02 PM
Subject: [TechAssist] Re: RCA HDLP50W151 SHUTDOWN
> 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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