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#1
12-23-2009, 12:24 PM
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newish phillips TV problem (fixed !!)
I have no exp with modern SS sets. A buddy got himself a flat screen and gave me a 32" phillips. It was working when I picked it up. He tells me it takes a long time to get it to come one, repeatedly pushing the on button upwards of dozens of times. Once on it is fine. He had it repaired a month ago, was told it was a flyback problem... anyway it worked for a week then same deal.
any insight as to what is going on? Last edited by DaveWM; 01-01-2010 at 03:31 PM. 
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#2
12-23-2009, 01:28 PM
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Some of the newer Philips sets have an electrolytic cap in the horizontal drive circuit that can cause this problem and it will take out the HOT if not replaced. My memory is taking a break; but, it's either a 22uf or 47uf and it's located somewhere around the center of the chassis with a couple of small transistors next to the cap.
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#4
12-23-2009, 08:56 PM
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I think it's C2455, a 47uf25V cap.
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#7
12-25-2009, 01:44 PM
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C2510 (47uf/50v) had indeed been replaced (sloppy, left the leads full length, looked like they had folded over, I had hoped that was it, cut the leads, prob still there). The pcb trace had lifted, I jumped it with a small piece of wire.
I tested the cap, the replacement was good, but I wonder if when it was possilibly shorted if that took something out. There is a big bridge rec, I get 158vdc on it. when starting up, the green light comes on, and I hear the HV start up (HV crackle0 thats when the green led goes out, then starts the blink sequence. model # 32PT9100D/37
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#8
12-25-2009, 02:17 PM
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There are a couple small transistors close to that cap that may be bad. In fact, MAT electronics sells a kit that contains the HOT, the two transistors, and the cap for these sets. As you've found out, it doesn't take much to wreck that PC board - very cheap made. If the HV comes up, if only for a second, the HOT is good. I'd probably check/replace those two transistors close to that cap. The vertical output IC may be shorted. I haven't seen it in these sets; but, I have seen them short in other newer sets and cause the power supply to shut down. Just remove the IC and see if the set comes on with no vertical deflection. If it does, replace the IC and electrolytic caps associated with it. There could also be a shorted diode off the flyback transformer or secondary of the switching transformer. IIRC, these sets will also shutdown if the G2 control on the flyback is not set correctly. I'm sure those blinks are an error code; but, I have no idea what it means. If these steps don't correct the trouble, I'd probably forget it. Philips/Magnavox sets really took a nosedive in quality in the late '90's and they've only gotten worse since then.
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#9
12-25-2009, 04:49 PM
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thinking this baby is curbside material. Anything worth keeping? what a piece of junk, it was made in 2005. has a energy star on it :roll eyes: you bet it saves energy, stops working after a few years. I have it sitting on my 1983 mitsubishi which still is going fine after 25 years. It is amazing how small the yoke is on these newer sets, compared to my old mid sixties sets that is. Guess it has to do with the way the gun is made, If I read correctly modern CRTs do not use 3 guns but rather a single gun that sweeps across 3 color dots.
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#10
12-25-2009, 05:30 PM
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You might pull the chassis just in case you need something off of it. That's what I usually do when I discard a newer TV. It's about to the point where if I can't fix a newer TV out of my junk, it's not worth fooling with. I just tossed a later model 36" Sharp with a shorted diode and a blown apart regulator IC in the power supply. I could have gotten the parts for around $7; but, what else would have been wrong with it? Even if those parts were the only thing wrong, it would have stayed here forever because it's not flat enough for most folks these days. Like I said, newer ones around here usually don't get fixed unless I have the part in my junk.
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#11
12-25-2009, 05:49 PM
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And, it's not just that TV. There has not been too many CRT sets made in the past ten years that weren't cheap made junk. As far as the "budget" sets, Sanyo was probably the best one.
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#14
12-25-2009, 08:55 PM
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Probably no need to save the CRT unless you think you'll need it. Of course, I never needed many of the CRT's that I saved until after I threw them out.
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