Question about Sony KDS-R50XBR1 50" HDTV

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High temp warning

Tv is on top of cabinet, not closed in. I have had 2 optical blocks replaced within last 3 weeks. The second time, the repair station took tv in to their shop. They also replaced optical block ribbon cable at Sony's instruction while at their shop. I had a few "words" with repair shop over their procedures while my tv was there. The day that I got the tv back, I had the "high temp warning" appear within first 30 minutes of operation. Never had this problem before. Coincidence? Have had the tv since 2006. I can hear and feel fan operating at lower left back of cabinet.
Thanks

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There are 3 fans in this unit, and 2 are on the rear of the unit. The one that may be a concern for you however is directly over the Optical Block it is inside the unit. That may be the reason for having 2 replacements in such a short time.

Posted on Oct 01, 2008

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MY TV HAD GREEN SPOTS AND THEN WENT BLANK. I REPLACED THE LAMP AND NOW WHEN I TURN IT ON THE POWER BUTTON BLINKS GREEN 3 TIMES AND THEN YELLOW 2 TIMES. THE SCREEN STAYS BLANK


The lamp will not fix the green spots. That is due to bad polarizers in the optic block. The lamp is only a white light. http://service.us.panasonic.com/OPERMANPDF/PT44LCX65.PDF

According to the manual you are not getting enough airflow which would explain the optic block failure. Make sure the TV has lots of space for air around it and is not inside a cabinet that would overheat it.

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Cold engine - - check that coolant level is correct - Ignition on but engine not running - set heter temp settings to max - set fan manual to one of the lower speeds - start engine and within 30 seconds rev it 3-4 times up to 3000rpm - shut off engine before end of 30 seconds (before it starts to heat) - reset climate to normal settings - recheck coolant and top up if necessary. Hot engine. - take car for a run to get up to operating temp - using caution - slowly open the bleed valve (steam and bubbles may come out) - close as soon as you see liquid coolant without excessive bubbles. - do not overtighten this as they are plastic threads. Just snug till it seals fully. - after engine cools check the coolant level again and top up if necessary. Check coolant level every few days for a few weeks and top up again if required - repeat the Hot engine bleed process again. If coolant keeps droping after 2-3 top ups have the system pressure tested. If you are still getting over temps have it analysed by a dealer. The temp is controlled by the engine computer so there may be another fault.

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thats caused by the optical block which is very expensive to replace. Sony has had alot of issues with the blue dots on the screen its not worth repairing due to the high cost of the optical block

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Cheapest solution - to replace DLP chip. instead of replacing whole optical engine.
This repair have to be confirmed (by running test patterns in service mode first) and done by professional.
Repair could cost aroung $400.
During procedure I would recommend to turn ceiling fans and other air blowing devices off. Single little dust speckle landing on the chip surface will ruing all effort and same amount of labor have to be applied yet again just to get rid of it (been there, done it).
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1 Answer

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is the led lit on the top of the projector? what colors?

green is ok.

red flashing in sequence:
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also make sure the lamp door switch is working.

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My first question is did you have this problem before your set was repaired the first time or did it occur after a tech took it apart?

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The door switches are very delicate and Sony warns techs in their training videos to watch for this when they do an optical block swap.

If I was repairing the set, I would meter the switch for voltage at the time it fails and if I saw voltage the switch is defective or the position of the switch board or optics is changing. If no voltage was measured at the time the set shuts off and the red light still blinks 3 times, then the board the switch goes to could be bad.

Who is your servicer if you don't mind me asking?

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High temp warning


2 BLINKS: Temperature

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1 Answer

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Check the thermal sensor fuse part# 1-910-023-93 or possibly one of the four fans. If the unit goes into Fan/Thermal Protect shutdown (4 blinks) it can be difficult to determine the cause since the unit turns off too quickly to troubleshoot. Solution: Ground the data line by inserting a jumper between pins 3 and 6 of CN44 on the H4 board. This overrides the protection circuits for troubleshooting. Do this right after turning the unit on and as soon as the lamp is seen lighting. Check pins 2, 5, 8, and 11 of CN6000 on the G2 board for less than 1VDC. Any voltage higher than that indicates a faulty fan. If all voltages are within specs, the H4 board must be replaced. If a fan is found defective, the optical block will need to be replaced if it is located inside the assembly. H4 Board Part Number: A1054674A Replace the following part based on which pin of CN6000 is out of specs: Pin 2: Fan 1 (part of optical block) Pin 5: Fan 2 178723211 Pin 8: Fan 3 178706511 Pin 11: Fan 4 178708111 Optical block Part Number: A1084662A

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