Hi, my husband and I tried to follow some previously posted advice pertaining to mistubishi tvs, vert hold and pip circut boards. We opened our tv only to discover... we don't even know where or what the pip circuit board looks like.
We don't care about the pip feature and simply would like to just remove the pip circuit board to solve the vert. hold problem. Our tv is model # cs-3115r. I'm afraid to clip the wrong brown wire. We are totally amature and just hope NOT to get electricuted when we plug it back in, thanks marnie
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The loss of brightness is probably caused by degraded high-voltage internal to the set. This can be caused by an electrical "brownout" that will correct itself.
The flipping problem is due to a degraded vertical synchronization signal. First make sure you have a strong signal - no loose antenna/cable connections, etc. Assuming you have a strong signal (i.e., no "snow"), analog TVs sometimes have a so-called "secondary control" (labelled "Vertical Hold", "VH", "Vert", etc.)located on the rear of the set. If you are lucky you may have one and be able to adjust it and regain stability.
Old sets used analog components (which age with time and are somewhat heat-sensitive) to control the vertical sync. Modern TVs use digital signal processing techniques that need no such controls.
Probably need to take the set to a repairman, if you can find one.
Good Day, sdkhanmd;
Replace C2P05 100 UFD 16 VOLT off pin 3 IC2P01 and IC2P01 part #270P466020 (9 volt regulator). Both are on the signal PCB. Also, check other caps in area for leakage.
Hope this was helpful, this common for this model.
Good Luck, big IRISH.
I got your previous post. normally, the adjustments are toward the back following the back side of the main board, if they are not there, then they are sprayed all around the main board itself. things to look for are:
I'm looking for a service manual for your tv 27pt9015d. still not having any joy finding this manual. the problem you are experiencing is technically called "vertical fold over", if there is no adjustments, then it's circuit controlled and will probably need servicing.
generally buttons are located at front only.
but if it is not there then it will be inside in the shape of small variable res. called preset.
vertical hold button will be near vert.section &horz hold near h/ section.
you have a vert sweep colapse. Fisrt thing is to get a schematic diagram and find the vert. output Ic and the clamper diode. Measure the voltage on both sides. If its low then its apossibility that the Ic was drawing loads of current and blew out the b+ feed resistor. Look on the schematic and trace back the voltage line from the vert output ic back to the sweep power supply on the secondary of the flyback transformer. check the limiter resistor to the feed and if its open replace the cap right there the resistor as well as the vertical output Ic ALL AT ONCE!!! If you dont you will cause it to go out again in a short time. Good Luck.. If you post the vert part of the schematic I will be more then happy to assist you with this repair.
If hitting the set gets the vert to come back then you have bad solder connections on the vert. outputs.. If it dosent then your gonna need to measure the voltage first on the vert output IC see if its about 24 or so volts If it is replace the IC. If its not the replace the vert B+ drive capacitor off the flyback xformer. If you cant find these things then your gonna need to get a schemtic from sams photo facts and post the vertical section and I will tell you or assist youin this repair. If you have had experience in soldering and curcuit work your already ahead in the repair. post the schematic.
You dont have enough vertical sweep!! Best thing to check is the vert output device and I think its an IC . BUT before that check the b+ going to that device and see if its low. I will run through a silicon diode right next to the ic. Measure both sides of the diode and if theres a big voltage drop then the diodes bad. Now also these sets are common for the b+ filter cap off thge flyback transformer. Its the voltage line that feeds that diode and the vert output section. Now measure all caps out of cucuit as most will measure good if you dont. Also just for giggles right nrxt to the big IC that has the vert ,horizontal video and sound drive there is if im not mistaking the vert parts start with c4-- or the ic will be ic4-- Its a small cap that will sayc4-- attached to nothing but the ground and one pin of the ic. I've seen this cap cause all sorts of vert problems in the past as its the vert waveshaper capacitor for the vert osc/drive. Good Luck