Question about RCA HD50LPW175 50" HDTV
First of all, I should mention that this is my first attempted DLP repair.
I have looked over the Service Manual and have made some very solid progress (I feel). I'll let you know what I have done so far and what I'm stumped on.
From "ATC336_Manual_lite.pdf"(which I got from another guru here (thanks))
Flow Chart "No Video - A"
Applied AC power, achieved normal boot up sequence, Began start up. Did instrument start normally and display video? :P Obviously not, onward to "No Video - B"
Flow Chart "No Video - B"
Did Color Wheel Spin? No, I have removed the lamp assembly and made sure to close the "Lamp housing safety circuit" and observed up close that the Color Wheel is NOT spinning.
Possible Light Engine Reset Failure ->
Remove AC power CHECK ->
Disconnect HDMI Cable to Light Engine CHECK ->
Apply AC power and wait for boot up signal to complete CHECK ->
Connect to any monitor capapble of Composite VIdeo Dislpay CHECK ->
Visible Video on Monitor? YES (I see a black screen with a few fuzzy white lines)
DM Module Ok
Go to Light Engine Troubleshooting chart
PROBLEM #1 (this is the same step I would have went to if they Color wheel DID spin, which leads me to believe that The said above steps should have "Fixed" the color wheel not spinning problem
Light Engine Troubleshooting Chart
Successfull Booth Sequence (5 blinds, Power LED stays on)
Color wheel Spin NO Remove AC and check Color wheel connectors and Color Wheel (I cannot figure out how to actually GET to the Color wheel)
Noting Problem #1, if the said steps had supposed "Overlooked" the color wheel not spinning... next box for Light Engine Trouble Trouble shooting?
Problem #2 Did Lamp Turn on? (Lamp Fan Start) Oddly, the FAN does start spinning but the Lamp does not start.
Continue to Light Engine TS - B
Remove Lamp CHECK ->
When boot up sequence is complete; turn on.
When the lamp strike occurs do you hear a tick? No, the ballast does not tick as it attempts to strike lamp arc.
So I guess the primary question here is Does the Color Wheel have to turn in order for the ballast to strike the lamp?
If so, does this mean the wheel needs to be replaced; if so; anyone have a diagram of how I un-house it?
If the ballast IS the problem; would a fixed one solve my problem and also make the Color Wheel turn again?
If I need any manuals with this response; my e-mail is Irsikd@aol.com
Thanks tons in advance!!!
This set has had issues with the power supply. It may have defective capacitors. This would require disassembly and replacement of parts.
Do you have test equipment and a service manual?
If you have a repair shop
do the repair, your cost may be $300.00- $400.00 to repair.
Parts and manuals can be purchased at:
Posted on Jan 08, 2009
I am not sure about your model but i do know on some samsung dlps there is a dip switch that has to be changed if you have the backwards color after changing the color wheel.I hope this helps.
Posted on Jan 22, 2009
are you sure when you replaced the lamp you seated it correctly, no really hapens all the time so dont feel bad. also another common error is the lanp door is not seated or closed and locked properly that is the most common problem that happens after a lamp is replaced, or the new lamp is bad never throw out your old one as somr dealers will give you what they call a core refund , they reuse the case around the old lamp. some can be worth as much as 50 to 60 bucks!!!
Posted on Sep 04, 2009
SOURCE: DLP Won't Finish Power-up Cycle
Yes replacing the lamp would do the trick because the Heaters or guns have become weak .
Posted on Dec 05, 2009
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