Pioneer SD-P55A3-k projo flyback or splitter?
I'm working on a Pioneer Model SD-P55A3-K Projection TV. Initially,
you can turn on the power for standby. However, when you apply main power, the unit goes into shutdown. When I removed the board assemblies from the light box, I discovered that the fuse (4 A) from the SMPS transformer for the -25 and P-25 lines was blown. This line feeds directly to the convergence board with the notorious STK392-110 convergence amps. After resoldering ring cracks on the power supply/ deflection board as well as the convergence board, I replaced the fuse and fired up the unit. Now you can apply main power. However, a hissing sound is heard from the flyback area. I am suspecting either the flyback or the high voltage splitter. After talking to my secondary supplier who supplies me with both Sharp and Pioneer parts, he indicated to me that is very rare that the flyback or the splitter fails. When I asked the customer what he witnessed when the tv failed, he told me that the unit went blank with a rushing sound. I need to get this right as my supplier tells me that the high voltage splitter can be replaced separately but the complete power supply/deflection module with the flyback has to be replaced completely.(Flyback cannot be replaced separately). The module is quite ewxpensive. I will return to the customer to perform the flyback unloading test (disconnect high voltage splitter) that I performed initially. Has anyone encountered this situation before. Any help would be appreciated. Thanks in advance. Ron -- Posted via Mailgate.ORG Server - http://www.Mailgate.ORG |
Pioneer SD-P55A3-k projo flyback or splitter?
It is rare that the flyback and splitters go, but I have seen a number of
them before. The only way to really properly test this is to try them. Otherwise you will be guessing around for many hours. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "Ron Novini" wrote in message news:41d7c25937de2b55ae8a43a9cebdc513.123933@mygat e.mailgate.org... I'm working on a Pioneer Model SD-P55A3-K Projection TV. Initially, you can turn on the power for standby. However, when you apply main power, the unit goes into shutdown. When I removed the board assemblies from the light box, I discovered that the fuse (4 A) from the SMPS transformer for the -25 and P-25 lines was blown. This line feeds directly to the convergence board with the notorious STK392-110 convergence amps. After resoldering ring cracks on the power supply/ deflection board as well as the convergence board, I replaced the fuse and fired up the unit. Now you can apply main power. However, a hissing sound is heard from the flyback area. I am suspecting either the flyback or the high voltage splitter. After talking to my secondary supplier who supplies me with both Sharp and Pioneer parts, he indicated to me that is very rare that the flyback or the splitter fails. When I asked the customer what he witnessed when the tv failed, he told me that the unit went blank with a rushing sound. I need to get this right as my supplier tells me that the high voltage splitter can be replaced separately but the complete power supply/deflection module with the flyback has to be replaced completely.(Flyback cannot be replaced separately). The module is quite ewxpensive. I will return to the customer to perform the flyback unloading test (disconnect high voltage splitter) that I performed initially. Has anyone encountered this situation before. Any help would be appreciated. Thanks in advance. Ron -- Posted via Mailgate.ORG Server - http://www.Mailgate.ORG |
Pioneer SD-P55A3-k projo flyback or splitter?
Actually on that set the HV block is matched with the deflection board at
the factory. Here is a note from Pioneer's tech tips: Symptom: Horizontal instability during brightness change after Power Supply/Deflection Board replaced. Cu Must replace Anode Distributor supplied along with replacement board, they are a matched set. Note other Tip regarding proper removal of cables from block. Models Covered: SDP50A3, SDP50A5, SDP55A3, SDP55A5, SDP62A3, SDP62A5 Tip Date: July 21 1998 When replacing either unit you replace the other also. The FBT IS available as a service part, P/N ATK1108, retails for $45.20. When replacing the FBT it is not advised to change the dist. block unless it is defective as you will need to change the deflection board also if the dist.block is bad, they are matched. If you feel like studying the service lit and finding the HV adjustment you could re-match them I suppose. Also, on the fuse blowing to the amp assembly, there was a run of DAC boards that cause excessive DC bias on the convergence IC's thus causing that fuse to blow after a period of time. For warranty Pioneer's FSE told us to replace the DAC and the Amp Assembly. Here's the tip on that. Symptom: SYMPTOM: UNIT SHUTS DOWN. RESISTORS ON AMP ASSY OVERHEATING. Cu CAUSE: DEFECTIVE CONVERGENCE CONTROL ASSY AND OR AMP ASSY. Models Covered: SDP50A3, SDP50A5, SDP55A3, SDP55A5, SDP62A3, SDP62A5 Tip Date: February 06 1998 Check all your anode connections and make sure all leads are firmly snapped in. Make sure you slide the gray rubber boot up the wire when removing or reinstalling the anode leads, it sometimes interferes with seating the cable. And last, here's a link to Pioneer Parts for that model. http://parts.pioneerelectronics.com/...elNum=SDP50A3K -- Jammy Harbin J & J Electronics, Inc 227 S. 4Th St. Selmer, TN 38375 731-645-3311 "Ron Novini" wrote in message news:41d7c25937de2b55ae8a43a9cebdc513.123933@mygat e.mailgate.org... I'm working on a Pioneer Model SD-P55A3-K Projection TV. Initially, you can turn on the power for standby. However, when you apply main power, the unit goes into shutdown. When I removed the board assemblies from the light box, I discovered that the fuse (4 A) from the SMPS transformer for the -25 and P-25 lines was blown. This line feeds directly to the convergence board with the notorious STK392-110 convergence amps. After resoldering ring cracks on the power supply/ deflection board as well as the convergence board, I replaced the fuse and fired up the unit. Now you can apply main power. However, a hissing sound is heard from the flyback area. I am suspecting either the flyback or the high voltage splitter. After talking to my secondary supplier who supplies me with both Sharp and Pioneer parts, he indicated to me that is very rare that the flyback or the splitter fails. When I asked the customer what he witnessed when the tv failed, he told me that the unit went blank with a rushing sound. I need to get this right as my supplier tells me that the high voltage splitter can be replaced separately but the complete power supply/deflection module with the flyback has to be replaced completely.(Flyback cannot be replaced separately). The module is quite ewxpensive. I will return to the customer to perform the flyback unloading test (disconnect high voltage splitter) that I performed initially. Has anyone encountered this situation before. Any help would be appreciated. Thanks in advance. Ron -- Posted via Mailgate.ORG Server - http://www.Mailgate.ORG |
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