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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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RCA P60928 PTK195 Chassis no power
I had a power surge that killed my TV and microwave. PTK 195 chassis.
I get no picture no sound no attempt to power on. No clicking. Nothing. Main fuse is ok power is ok just past the fuse. Any ideas. Thanks Ted |
#2
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RCA P60928 PTK195 Chassis no power
On Fri, 1 Oct 2010 07:55:40 -0700 (PDT), "
wrote: I had a power surge that killed my TV and microwave. PTK 195 chassis. I get no picture no sound no attempt to power on. No clicking. Nothing. Main fuse is ok power is ok just past the fuse. Any ideas. Thanks Ted Several. 1. I was not aware anyone had sold a combination TV and microwave. 2. Giving the chassis number properly assists in searching. (it is the PTK195 chassis, not the PTK 195). 3. The Photofact album is available at http://elektrotanya.com PlainBill |
#3
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RCA P60928 PTK195 Chassis no power
On Oct 1, 10:55*am, " wrote:
I had a power surge that killed my TV and microwave. PTK 195 chassis. I get no picture no sound no attempt to power on. No clicking. Nothing. Main fuse is ok power is ok just past the fuse. Any ideas. Thanks Ted The 195 is not a modular chassis, it is expected that anyone who attempts repair can troubleshoot to the component level, and deal with surface mounted devices. That said, the 195 is extraordinarily reliable, earlier versions needing a flyback perhaps, but a long lived and excellent performing analog TV. Start by checking for 5 volts at the IR receiver on top of the light box. If that's there, you have a system control problem, maybe the micro reset circuit, corrupted eeprom, etc. If no 5v exists, the main smps is out. Watch out, this supply holds a vicious charge for a long time. |
#4
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RCA P60928 PTK195 Chassis no power
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#5
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RCA P60928 PTK195 Chassis no power
Thanks John. I have no problem going to component level. I do a lot of
work on arcade game monitors. I have not realy worked on projections. I do not know where some of the components are located on the projection. You are correct about the flyback as I have replaced that years ago otherwise no other problems with the tv. Thanks that gives me a good starting point. Ted |
#6
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RCA P60928 PTK195 Chassis no power
OK looks like the 5 volts is good. Where is the micro reset circut
located. Thanks Ted |
#7
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RCA P60928 PTK195 Chassis no power
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#8
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RCA P60928 PTK195 Chassis no power
ok so how do I get into service mode if I cant power on the set. Is
there a service switch on the pcb somewhere. Thanks Ted |
#9
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RCA P60928 PTK195 Chassis no power
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#10
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RCA P60928 PTK195 Chassis no power
On Oct 2, 8:52*am, " wrote:
OK looks like the 5 volts is good. Where is the micro reset circut located. Thanks Ted You said there is no power on attempt (no clicking ). The 195 is very quiet when attempting a start as it has no relays. In a quiet room, start the TV from the remote listening carefully in the back of the TV. If you hear anything (chirp), the system control is okay, at least the basic stuff. If it's truly dead, check the micro reset voltage: On the main micro U13101, check pin 51 for 5 volts. |
#11
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RCA P60928 PTK195 Chassis no power
OK I have 5 volts on pin 51. I know its very quite but I dont hear
anything at all. Are you thinking U13101 may be bad? Thanks Ted |
#12
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RCA P60928 PTK195 Chassis no power
OK I have even put an amp meter on the line comming in and I am
getting around 300 milli amps when pluged in but no change at all when I hit the remote. I get a slight chirp when I first plug it in but no change again with the remote. Thanks Ted |
#13
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RCA P60928 PTK195 Chassis no power
On Oct 2, 7:05*pm, " wrote:
OK I have even put an amp meter on the line comming in and *I am getting around 300 milli amps when pluged in but no change at all when I hit the remote. I get a slight chirp when I first plug it in but no change again with the remote. Thanks Ted It's unlikely the micro is bad unless you caught some lightning. Of the two, the eeprom is more likely to have failed, but are uncommon in the 195. If the eeprom is bad, you will need to confirm it with a scope. If the Vcc and reset voltages are good at the micro, but there is no response from the system control, there are a couple of possibilities. The easy one is to unplug the front panel connector from the top of the light box where the IR is located. If the TV powers up from the remote, you've got bad tact switches on the front control board. You can either leave it unplugged, or replace all the tacts. If it doesn't respond, get a bright light and look for any evidence of coolant leakage around the micro, eeprom, and LV regulators. If you have coolant leakage in any area, it will need to be removed (time consuming). |
#14
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RCA P60928 PTK195 Chassis no power
OK John Thank you very much. Last question. Where can I get a new set
of switches. I never would have thought it would have been that easy. Thanks again. Ted |
#16
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RCA P60928 PTK195 Chassis no power
Thanks for nothing plainbill. I never stated it was a combo microwave
tv. I stated both went so that you would know it was probably a problem from an electric surge being that two thing went at the same time. I did give the chassis number and the model of the tv I cant help it if you cant read. The link you sent me was not in english and would not convert to english so that was useless. Whos the doofus now. Thanks everyone else for your help. Ted |
#17
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RCA P60928 PTK195 Chassis no power
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#18
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RCA P60928 PTK195 Chassis no power
On Sun, 3 Oct 2010 09:23:47 -0700 (PDT), "
wrote: OK John Thank you very much. Last question. Where can I get a new set of switches. I never would have thought it would have been that easy. Thanks again. Ted Did we miss something? He suggested a test, and you are saying you want to replace switches... So you tested and the switch module was bad? |
#19
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RCA P60928 PTK195 Chassis no power
John suggested pulling the wires from the ir board that go to the
front panel on/off chnl swithches and see if the remote would turn on the tv. That fixed it. One of the switches on the front panel must be stuck on. Ted |
#20
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RCA P60928 PTK195 Chassis no power
" wrote: John suggested pulling the wires from the ir board that go to the front panel on/off chnl swithches and see if the remote would turn on the tv. That fixed it. One of the switches on the front panel must be stuck on. Ted Then pull out the panel and test the switches. There aren't that many different types of tactical switches. All you need to do is match the footprint & height in most cases. There are a lot of places to buy new ones, or if you're a cheapskate you can probably find on in an old computer mouse or junk VCR/ DVD player that will fit. http://parts.digikey.com/1/parts-kws/tactile-switch http://www.mouser.com/Search/ProductDetail.aspx?R=101-0164-EVvirtualkey12040000virtualkey101-0164-EV http://www.mcmelectronics.com/product/28-10735&CAWELAID=220320974 Each of these companies carry different styles. -- Politicians should only get paid if the budget is balanced, and there is enough left over to pay them. |
#21
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RCA P60928 PTK195 Chassis no power
On Oct 3, 9:37*pm, " wrote:
John suggested pulling the wires from the ir board that go to the front panel on/off chnl swithches and see if the remote would turn on the tv. That fixed it. One of the switches on the front panel must be stuck on. Ted |
#22
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RCA P60928 PTK195 Chassis no power
On Oct 3, 9:37*pm, " wrote:
John suggested pulling the wires from the ir board that go to the front panel on/off chnl swithches and see if the remote would turn on the tv. That fixed it. One of the switches on the front panel must be stuck on. Ted If the TV now powes up with the FPA disconnected, you can continue to run it that way with no problem, or you can replace the tacts: Acme has what you need. Go to their website and search ACME-302. I guess you can't post URLs, but try Acme(dash)sales(dot)net This is the correct tact for that series, change all of them (probably six). The 195 was made from about 1997 to 2002, so there are different ways of getting to the front panel assy (assuming you don't already have it out), but all are done from the front of the TV. The process involves removing the front speaker grille, and snapping the control panel out by releasing the plastic fingers that locate it to the front grille. There are no screws or other fasteners involved. After removing the old tacts, clean the pc under the tacts with a cleaner before installing the new ones. |
#23
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RCA P60928 PTK195 Chassis no power
On Sun, 3 Oct 2010 18:37:02 -0700 (PDT), "
wrote: John suggested pulling the wires from the ir board that go to the front panel on/off chnl swithches and see if the remote would turn on the tv. That fixed it. One of the switches on the front panel must be stuck on. Ted Ah, I'd missed the fact you'd done that diagnostic. I wonder if you can disassemble and clean the switch module? |
#24
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RCA P60928 PTK195 Chassis no power
Thanks again John. Let me know if you ever need a hand with an arcade
game. Ted |
#25
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RCA P60928 PTK195 Chassis no power
On Sun, 3 Oct 2010 10:17:26 -0700 (PDT), "
wrote: Thanks for nothing plainbill. I never stated it was a combo microwave tv. I stated both went so that you would know it was probably a problem from an electric surge being that two thing went at the same time. I did give the chassis number and the model of the tv I cant help it if you cant read. The link you sent me was not in english and would not convert to english so that was useless. Whos the doofus now. Thanks everyone else for your help. Ted My point exactly. You claimed it was a PTK 195 chassis, of course, it actually is a PTK195. In spite of that bit of misinformation, I was able to identify the source for the Photofact manuals. As for the site being in Polish, of course it is; it's located in Poland. However, anyone with s bit of competance (yes, this probably excludes you) would not that major headings are in both Polish and English. I stand by my evaluation of your abilities, Doofus. PlainBill |
#26
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RCA P60928 PTK195 Chassis no power
On Oct 4, 9:18*am, " wrote:
Thanks again John. Let me know if you ever need a hand with an arcade game. Ted Actually, one of my very best friends has been in the vending business for a very long time, and I fix his CRT monitors for him. Of course, the business isn't what it was, and he's getting into other things. I will however take you up on your offer if we ever get stuck on something and can use some extra help. Enjoy that 195 (for probably another 10 years). John |
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