Philco TV: 20MS6. Have vertical problems
Good evening, the integrated ones that I use, as you know they are in good condition? You have to measure tensions for me in the most important points, Leg 1 (between 9 to 12 Volts) (in Leg 8/13 between 24 to 25 Volts ) It is not a chassis to get complicated in the vertical stage, it may have an open preset, some resistance, the capacitors must be new, you cannot use recovered ... (You must mention the addresses of the renewed capacitors ... Renew the diode 302 ...
friend. Ruddy As is the line that appears on the screen is from side to side or from top to bottom. comment
friend neg2013 you are right I do not know if the integrated ones that change are good, I have 2 preset the two mark me differently the diode 302 I am going to change it and the filters that I measured outside the plate with a capacimeter are c304 c201 c815 c308 c303
I don't know where you are from, but as far as I know the LA7837 IC is still commercial, well at least I get it, but I don't know how you know those ICs are doing well ... If you don't get the LA7837 you can try replacing them, Bah , the LA7838, is the same only that one is for 14 to 21 inches, the next is for 29-inch televisions or vice versa should not be used
Hello friends, I am addressing all those who contributed their time in collaborating with their contributions. Thank you, thank you very much. I want to inform you of the work I have done, first apologize for not answering last night for a bad weather that was due to my payment 60 km from Salta, Argentina's capital. and cut electric power, clean the plate on both sides and with magnifying glass checking cold solders and resolving, control resistors by disconnecting one of its legs; R303.33k R304 33k R308 39k R31 368k also capacitors replace them with new C815 33uf 160v C 302 1000uf 50v C 303 1uf 50v C308 470uf 50v, replace diode 302
check the winding of the yoke I have tested with another tube remains the same and with respect to the image they sent from the line if it was vertical or horizontal it is the first is horizontal said and checked everything they asked me, I do not have an oscilloscope to prove as Jose Fernandez said , I may not have pulse from leg 46 of jungle 501 to pin 2 of 7837, I forgot to remove the two preset R350 R 300 are not aviary hover between 45k and 4k
After changing the capacitors and controlling the resistances, I took the integrated voltage again and all the same when I took it for the first time, I traveled on Monday to buy a new integrated one and commented
friend. okay. So you have to have the volt. on the pins of the ic. la7837, pin 1- 11.9volt. pin 2- 4.5volt. pin 3- 5.9volt. pin 4- 6.volt. pin 5- 0.4 volt. pin 6- 6.0volt. pin 7- 5.5volt. pin 8-24.1 volt. pin 9- 1.9volt. pin 10-1.3volt. pin 11- gnd. pin 12-14.2 volt. pin 13-24.6 volt.
Ruddy
You must differentiate when it is a vertical or horizontal line.
It says textual "has a vertical line".
of pin 46 goes out the pulse and passes through SW301. MOVE the same.
Also look at this part where the R312 = 36k is.
Confirm if the IC has all the voltages as shown in the circuit.
He doesn't comment if the R's are fine. Either R312 or R309. It depends on diagram. The R in question if it is open does not extend or work the vertical well. I commented on the impedance of the yoke.
Having no oscilloscope DE makes this tool.
https://www.comunidadelectronicos.com/proyectos/inyector-50-60Hz.htm
Measure the voltage on pin 41 as indicated by the colleague and follow the form until pin 2 checking components and that it is not cut.
Let's see. desolda pin 2 that does not print. And measure in the latter if you have the 4.5 v that comes from the jungle. That tension if or if you should have it. If it is not the jungle does not send a signal. If it is the IC does not work. Change Yes or yes.
Hi Luis, the R309 is 22ohm and the R312 is good, it is also 10k and the yoke impedance is not the tube I stay at the client's house I try it with another model philco tube and the tube is fine I have it tested , I comment that I got doubt of the integrated the 7837 I have a plate of a philco I do not have the model that plate is good the chassis is CN-53 the integrated vertical is ok I took it out and I put it on this plate and nothing ... .Now I try with the finger on pin 2 and comment
I sent you how to make a simple vertical tester. The R 309 is 2.24kohm. Do not give 22 ohm.
YR 312 is 2.7 ohm.
As diagram above. Notice.
Luis probe on leg 2 of the integrated desoldering of the printout marks me 3.7v I take voltage when I turn on the TV on pin 41 2v
That report was waiting. If the IC appears desoldered and soldered NO, something is short. Either the IC that broke again. Above I was wrong to put the heat of the R 309. It must be 2.4 k. According to scheme. Okay.
Check if you did not place any electrolyte in reverse.
you have reason luis excuse the R312 It has brown orange black stripe and the R309 has red silver red silver
the R309 if it's like in the diagram I took it out and the eta test ok maybe 312 was modified my doubts
You are getting confused or it is not the same diagram.
R312 is going to mass look and should be 2.7 ohm. 2.2 ohm can also be. But 10k No. That is brown black orange.
Friend guide you through the diagram dua. The location of each R. It compares its cerigraphy well.
If they changed the one that goes to mass it will never walk properly. But the 4.5v pulse must have yes or yes pin 2.
Please confirm whether it is that chassis. CM -560A. OKAY. Because if so, the R309 is 2.2ohm and R 312 is 36k and goes to pin 5 of the vertical IC and Q301.
I will see in diagram of pin 41 says colleague Javier. Beware that there is a service key. If it was moved, the line goes out and does not mean broken vertical ic. Many times one when cleaning nine. You are with the plate look good if so. It is a white knob to move it to the other side or to the center and see what it does on the screen.
hello luis the chassis is the CM530A moved the white knob of the service key from one side to another and does not present any signal on the screen now the horizontal line that came out white now comes out in blue
Look at sw welds and that internally makes good contact. Put some clean contact. Just in case I am failing, I don't believe.
Leave it as it was.
The R309 you say is 2.2 ohm. Don't give 22ohm Confirm this
Measure pin 2 the tension leaving the key as it was originally. Then you move it and measure again. Comment results.
Hello friend Luis I did exactly what you told me clean the SW and take voltage, surprise in pin 2 I have 6v, eltv started full screen a huge thank you, because without your help I would not have achieved it vertical conclusion was not damaged missing voltages in pin 2 SW 301 dirty, avid or moved, again I thank you for a hug
Ruddy, you don't comment anything if you checked the sw 301 service key that takes from pin 46 (vert out) of the jungle and goes through r301 (1k) to leg 2 of la7837. This key must be closed (if bridging does not work) and is placed about 3 cm from the audio output transformer (next to the q602 transistor: a940 tip type with heatsink)
Or what voltage should I have moved from one side to another and I saw no difference on the screen
Yes, but the 2 center pins do not have a connection, it only bridges the 2 end pins when the key is for the front side. So to test if you open the screen you bridge the 2 ends
then you are going to have to assemble the sawtooth generator that is very simple, only it has to be a transformer with 6v or 9v output and not autotransformer (the primary coil must not drive with the secondary), then you connect an output of the mass generator and the other to pin 2 of the str and if you open the screen a bit the problem is in the jungle. Traffic amperage does not matter, it is minimal. Look first if the electrolytic c402 of o, 47uf in pin 47 of the jungle is fine, also check the zener diode d 402 (9.1v) on the same line and if it does not leak c401 in parallel with the zener.
