[TechAssist] Re: RCA HDLP50W151 SHUTDOWN FIXED!
- From: "jonas miglinas" <miglinasj@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 30 Aug 2004 19:41:13 -0500
Hello All,
Brought the set to the shop so I could trace the problem in peace.(client
was being a pain) After changing the DM2 module which got the set at least
to fire up, it would shutdown in some 20 seconds. Using the troubleshooting
guide and the voltages on the cd schematic, I found the connector(J24252 -
on the AC board) to the lamp power supply had a weak solder connection. Lamp
never fired up. Resoldered and has been playing now up to eight hours a day
for four days.
Thanks to all who shared their knowledge.
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
> > > >
> > >
> >
>
> --------------------------------------------------------------------------
> > > ---
> > > > Lost Password:
> > > > http://www.tech-assist.org and select "Login Problems?".
> > > > Email Archives:
> > > > //www.freelists.org/archives/techassist/
> > > >
> > > >
> > >
> > >
> >
>
> --------------------------------------------------------------------------
> > ---
> > > Lost Password:
> > > http://www.tech-assist.org and select "Login Problems?".
> > > Email Archives:
> > > //www.freelists.org/archives/techassist/
> >
> >
>
> --------------------------------------------------------------------------
> ---
> > Lost Password:
> > http://www.tech-assist.org and select "Login Problems?".
> > Email Archives:
> > //www.freelists.org/archives/techassist/
>
>
>
> --------------------------------------------------------------------------
---
> Lost Password:
> http://www.tech-assist.org and select "Login Problems?".
> Email Archives:
> //www.freelists.org/archives/techassist/
-----------------------------------------------------------------------------
Lost Password:
http://www.tech-assist.org and select "Login Problems?".
Email Archives:
//www.freelists.org/archives/techassist/
Other related posts:
- » [TechAssist] Re: RCA HDLP50W151 SHUTDOWN FIXED!
