I did have coolant leakage several months ago, but after cleaning the board and changing R14110, the set worked fine for 4 months. There is no coolant on the board now. Thanks. I just plugged the set in, the P/S tweaked like it was ready to come on and found 5 volts on pin 19 of the micro, and 5 volts on pins 5, 6, and 8 of the eeprom. Then of course as I as measuring these pins the voltages disappeared and the set was dead again. Kevin Wilks Kevin's TV & Video Repair Penticton BC Canada kevintv@xxxxxxx -----Original Message----- From: techassist-bounce@xxxxxxxxxxxxx [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Ohio Consumer Electronics Sent: Friday, July 30, 2004 1:05 PM To: techassist@xxxxxxxxxxxxx Subject: [TechAssist] Re: RCA PTK195B, mostly dead. Look real close for coolant around the micro-eeprom area. Hard to see but only takes a couple drops to mess it up. I had one of these 195's that was intermittent and that fixed it. I had to remove the micro, eeprom and the keyboard and chipper-check sockets to clean under these components. Then the set came on and stayed on but it didn't have any menus because the eeprom was corrupted. I replaced the eeprom and got the menu back but had to buy a chipper-checker to do the tuner alignment - what a nightmare that set was... Joel Jacobs Ohio Consumer Electronics Pickerington Ohi'o ----- Original Message ----- From: "Kevin" <kevintv@xxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Friday, July 30, 2004 3:09 PM Subject: [TechAssist] Re: RCA PTK195B, mostly dead. > I already unplugged the keyboard and it is still dead most of the time. > I did some more testing this morning and found that the eeprom (U13102) > has only 3 volts on pins 8 (Vcc) and 5 (clock). Pin 6 (data) has 0 > volts on it, instead of the normal 5 volts. That certainly is not > normal. > > Kevin Wilks > Kevin's TV & Video Repair > Penticton BC Canada > kevintv@xxxxxxx > > > -----Original Message----- > From: techassist-bounce@xxxxxxxxxxxxx > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of tvservice > Sent: Friday, July 30, 2004 6:34 AM > To: techassist@xxxxxxxxxxxxx > Subject: [Tec'hAssist] Re: RCA PTK195B, mostly dead. > > Unplug the front panel keyboard see if operates OK with remote. > lift the 1K ohm resistor off micro to U14701 then plug in AC power you > should now always have +5 and +12 out of U14701 > Set will not be on until press power, > I have seen this IC intermittent > also remove bottom tuner cover and carefully resolder every ground point > and > sm cap at ground points > Remove glue from micro crystal and resolder > If this set has dual tuners unplug cables to second tuner I have seen > problems on the second tuner assembly cause intermittent dead set. > hth > Robert > tvservice@xxxxxxxxxxxxx > H & H Electronics Inc > > ----- Original Message ----- > From: "Kevin" <kevintv@xxxxxxx> > To: "TECH-ASSIST" <techassist@xxxxxxxxxxxxx> > Sent: Friday, July 30, 2004 4:08 AM > Subject: [TechAssist] RCA PTK195B, mostly dead. > > > > This set works sometimes, but most times not. When the set does work, > > it will wo'rk for a minute and then just shuts off by itself and will > not > > come on. I have the SM on CD rom and I am following the trouble > > shooting procedure. I found that when I monitor pin 19 of U13101 > > (microprocessor) and press the power button, pin 19 does not go high > as > > it is supposed to. The micro has 5 volts going to pins 16, 29, 32 and > > 51. Pins 3 and 20 of U16201 are missing the required 7.5 volts. > After > > that the troubleshooting flowchart tells me to repair the defective > P/S > > source. So I traced the missing voltage back to U14701, a dual > voltage > > regulator. Pin 6 is missing 12 volts and pin 7 is missing 5 volts. > Pin > > 1 and 2 both have 18-20 volts which is good. Pins 3 and 5 are > supposed > > to have the 5 volts from pin 19 of the micro when the set is on. But > of > > course there is no 5 volts coming from the micro. The set must be > going > > into shutdown. What can I check next? Thanks. > > > > Kevin Wilks > > Kevin's TV & Video Repair > > Penticton BC Canada > > kevintv@xxxxxxx > > > > > > > > > > > ------------------------------------------------------------------------ > -- > --- > > Lost Password: > > http://www.tech-assist.org and select "Login Problems?". > > Email Archives: > > //www.freelists.org/archives/techassist/ > > > > ------------------------------------------------------------------------ > ----- > Lost Password: > http://www.tech-assist.org and select "Login Problems?". > Email Archives: > //www.freelists.org/archives/techassist/ > > > ------------------------------------------------------------------------ -- --- > Lost Password: > http://www.tech-assist.org and select "Login Problems?". > Email Archives: > //www.freelists.org/archives/techassist/ > ------------------------------------------------------------------------ ----- Lost Password: http://www.tech-assist.org and select "Login Problems?". 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