Philips Model 50PP920217F Chassis DPTV305F replaced ic's and fuses & blinking red led now


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Philips Model 50PP920217F Chassis DPTV305F replaced ic's and fuses & blinking red led now

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mmoore67
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Jan 23, 2008, 5:23 PM

Post #1 of 7 (355 views)
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Philips Model 50PP920217F Chassis DPTV305F replaced ic's and fuses & blinking red led now	Can't Post

Philips Model 50PP920217F Chassis DPTV305F replaced ic's and fuses & blinking red led now
50" Rear Projection TV
I originally started out having a blue haze around images and lettering on picture, which couldn't be adjusted. Then, I started having double images with the red and green. My husband replaced the IC's stk392-120's with stk392-180's because someone on a web forum said they were stronger. He put heat sink compound on back of IC's and and soldered pins. He didn't replace any of the resistors because he thought they looked good. Put everything back together, but a ribbon cable may have not been connected and two resistors blew on the board.
He replaced those two, plus 6 larger resistors near the IC's that didn't test for having continuity on the circuit. Service manual called for 6R8 1Watt metal film. Radio Shack wasn't sure what 6R8 was and wanted to know what the ohms was, but service manual only listed above. They compared the bands on resistors and gave us 1 watt resistors that were supposedly compatible. Plugged everything back in and it just has the red power button blinking with no picture. If he unplugs the cable closest to the IC's that goes to the second board, the power button stays a solid red, which he read, meant that we still had an IC issue.
Can anyone tell me if or how to test the IC's and if we shouldn't have upgraded to the stk392-180's? Prior to us trying to fix it, we at least had a poor quality picture. He has tested all of the fuses for continuity on the convergence board and they seem fine. Any suggestions would be greatly appreciated. We ordered IC's off of electronix.com. Should we replace ic's and 6 fuses again? Also, how can I confirm that we have connected all the cables correctly. I have downloaded the Philips service manual for this model, but wasn't sure what to look for. Should numbers on the board correspond to something on the cables, etc. We labeled them 1st, but a few of the labels fell off.

techchris
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Jan 23, 2008, 6:48 PM

Post #2 of 7 (345 views)
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Re: [mmoore67] Philips Model 50PP920217F Chassis DPTV305F replaced ic's and fuses & blinking red led now [In reply to]	Can't Post

check there are no pins on the ic's short circuited by a small blob of solder.the tv should power up if you remove the ic's.if it does they may have blown. the ic's may be chinese equivalents which dont last longer than a day or two so always order manufacturers specific parts. BTW 6R8 is 6.8 ohms.no way to match cables to sockets apart from experience unfortunately.always best to take a photo first.

mmoore67
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Jan 24, 2008, 10:40 AM

Post #3 of 7 (341 views)
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Re: [techchris] Philips Model 50PP920217F Chassis DPTV305F replaced ic's and fuses & blinking red led now [In reply to]	Can't Post

Techchris, thank you for your response. There doesn't seem to be any solder between the pins that I can tell. The IC's may have been cheap or I guess they could have blown when the 2 resistors blew.
We confirmed all the wire connections last night with the wiring diagram from the service manual. The are all connected correctly. I also got all the part numbers for the 6 resistors, 3161-3166 and the two that blew previously were 3153 & 3154 that we replaced.
So, I think I will order the stk392-120; instead of, the stk392-180; along with the resistors above and give it another try. I can't get into the service menu, since there is no video. The power button led just blinks repeatedly nine times. I tried to figure out the diagnostic code in the manual for this, but wasn't sure. It may be IC communication failure?
We will try to take the IC's out tonight and see if it powers up. Thanks again for your help. I really appreciate it.

mmoore67
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Jan 29, 2008, 10:50 AM

Post #4 of 7 (323 views)
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Re: [techchris] Philips Model 50PP920217F Chassis DPTV305F replaced ic's and fuses & blinking red led now [In reply to]	Can't Post

TechChris,
We purchased new IC's from www.mcmelectronics.com (sanyo brand) and the 6 - 3W 100 ohms 5% resistors and the 1W 6.8 ohms 5% resistors from www.mouser.com that blew previously and had replaced with a brand from Radio Shack. We replaced all of them again. Tested all the circuits to be sure they had continuity after we soldered them. Put the board back in and confirmed that all the connectors were connected properly. We turned the tv on and got the same result. No picture, no sound, and the power led light blinks repeatedly 9 times. It doesn't allow me to get into the service code menu since there is no video. We also tested the fuses on the power supply board, but couldn't find any that were not working. I tried to purchase the entire board from www.partstore.com, but they said that they can no longer get it. When I checked Philips website, I couldn't find where they offered any parts for this model anymore. No one locally will work on it. Does anyone know where I can get a new board that is compatible with this model? Or could possibly give me an idea where to check from here to see whats wrong? It worked before we tried changing the IC's, the picture was just 3 dimensional with green and red and blue was off also. It's a shame to throw away a tv that is only 4 or 5 years old.

mmoore67
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Feb 2, 2008, 9:58 AM

Post #5 of 7 (307 views)
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Re: [techchris] Philips Model 50PP920217F Chassis DPTV305F replaced ic's and fuses & blinking red led now [In reply to]	Can't Post

TechChris, I wasn't sure if you saw my last post, but I was wondering if you wouldn't mind reading it or had any ideas?

techchris
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Feb 2, 2008, 11:59 AM

Post #6 of 7 (302 views)
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Re: [mmoore67] Philips Model 50PP920217F Chassis DPTV305F replaced ic's and fuses & blinking red led now [In reply to]	Can't Post

9 flashes is a fault on the 8v supply or the tda888 ic according to the manual.this feeds various parts of the tv including auto convergence.if it worked before the ic's were changed my guess is something happened at that time which cooked other components.,or something was connected wrong when it was reassembled.

slinteriors
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Feb 25, 2008, 5:15 PM

Post #7 of 7 (264 views)
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Re: [techchris] Philips Model 50PP920217F Chassis DPTV305F replaced ic's and fuses & blinking red led now [In reply to]	Can't Post

I am parting out a 2 year old magnavox HDTV that had a cracked CRT the circuit boards are in excellent working order. Let me know if your interested. servicemanuals13@gmail.com

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