When you say no video, is there any light on the screen at all? And is there any sound?
Sounds like a power supply problem. Do you have any solid state repair experience?
Do you have a service manual? And can you read and follow the circuit flow using a scematic diagram?
Send me a copy of it to [email protected] and I will see what I can do for you.
Ok got the manual. Will look it over and give you a few things to check in a while, after I look it over.
OK first things to check and get back to me with your findings please. All of these checks are on the A board. Check the voltage on C619, the plus side. Check the voltage on C620, the plus side also. Find the plug number CN604 and measure the voltage on pin number 1. Find the audio output IC and IC202 and check pin number 8. If no 12 volts there, change the IC and replace the circuit protector, PS201. COMMON fault with this TV set. Next find the 9 volt regulator IC604. It will have three legs on it. The right leg, as you are looking at it from the front, should measure 9 volts. Next if there is no voltage there see if the IC is cold or is it hot, Disconnect the left leg as you are looking at it from the front. and measure the voltage on the board where the left leg was connected, not the leg on the IC. It should be 12 volts. if it is, replace the IC. It is a simple 12 to 9 volt regulator in a to-220 package. Good Luck
Just be careful!
Yes I am. It is the main capacitor off the secondary of the switching power supply. It is the 130 volt source. i am using the scematic you sent me.
Look on the A board parts list. it may not be mounted on the board?
Wait a sec, The manual i received was the Panasonic, CT36SF24U. Is this from you? It is fron you it said in the e-mail? I did not even look at the manual before now, or the number.
I am sorry, I am working with two other sets at the time, helping others. I gave you info for another set. I am looking at your set and will be posting new instructions soon.
Ok now that I am now on the same page.
Start out by measuring and telling me the voltage on the main regulator IC, on pins 1&2. Tell me what you have on the plus side of C 818, C 812, and C 821. Next find plug # P1 and tell me what you have on pins 7 & 8. Next find plug # P2 and tell me what you have on pins 5 & 8.
No you have to put one lead onto the metal chassis, and the red lead directly to the Plus lead on the capacitor on the printed circuit board. The top of the capacitor is the negitive lead. And it is IC 801 for the voltage regulator. Replace the regulator IC and make sure there are no burnt resistors around the regulator.
What are the voltages on all of the pins on the voltage regulator, and what does the plus side of C 818 measure on the printed circuit board?
Check voltage on C 806 on power board, with negitve lead of meter on negitive lead on capacitor on the PCB and the positive lead of the meter on the + lead of the capacitor. Be careful, as this is high DC voltage.
Ok change the regulator IC.
It is possibly the final fix, you cannot tell till you replace it. If you do know how to test the remaining transistors in that circuit, please do so. Also test the horizontal output transistor for a short. Last thing, with the set unplugged, test the resistance from C818.. At this point, replacing the entire P board is certainly an option. The part number is TNP111505RZ and is available from the partsore.com for about 98 bucks and the link for that board is available here: http://www.partstore.com/PartSearch.aspx...
Opps from across C 818, and see if it measures a short.
I made a mistake when I stated what to measure C818, see if it measures a short acrossed both legs ON the printed circuit board side while the set is unplugged.
my best advice though, if there is no short across, C 818 replace the board.
×
67 views
Usually answered in minutes!
no light. Only sound is faint audio in background sounds like shortwave broadcast
but not discernable. Tried leaving power off for
10 minutes. Tried reset using 2 buttons. It
recycled but no picture and no light in tube.
no light on screen see info above. Thanks
I can solder and I do have a meter to test
voltages and continuity.
I can solder and I have test meter for voltages and continuity.
have manual. Probably can follow most of schematic but not sure can locate items on the board itself, but willing to try
pretty large but I will send
several files in the manual. Had to split up since your mail refused large attachment. Let me know if you are missing anything.
i will attempt this tonight.
OK !
There is NO C619 I really looked and cannot find it.. Are you on the Same Chassis?
Do you see it in the manual? What page? I'm sorry but I just am not able to locate it yet.
Still looking.
The only transformers I found: on the P board T801, and D board T1551, and T board T2801. None on C board. None on G board. None on Y board. None on H board. None on J board. None on Q board. None on N board. None on F board.
None on R board. None on S board. None on R board. None on X board. None on C board.
Check Page 1 and page 45. It shows that it covers 2 different chassis. I sent you the right manual. The chassis we have is probably the ANEDP294. I think you are looking at the
AEDP294. the set is the 54" model! I also located the other 2 transformers t501+ t551 on the A board diagram.
I don't know who or why this is constantly being linked to different model
MY MODEL IS CT-36XF54V CHASSIS ANEDP294
here is cover
Which number is Main Regulator IC? Again, I have the manual but the IC001 doesnt look like it has pins for test lead like IC846 had.
I saw on pg 28 there was a source voltage chart
so i checked IC846 pin 3 and IC803 pin 3
which were both at correct voltages. But when
I checked D813 it was supposed to be +35.8 and
it only had about 4 volts.
I will stay on line while you let me know.
cannot find c812
I found C818 AND C821
if i used metal point on top of the can with +
on it meter showed -.21 for c818 and -.15 for C821.
Plug 1 pin 7 -.01 pin 8 nothing
plug 2
pin 5 11.6
pin 8 0.41
Do I have to take more readings, or are you saying that IC801 is defective? I think I found ic801 it looks like it has a large heat
sink attached to it and it is rather warm. I
don't see anything on the P board that looks
burnt but there is a spot on the A board that
looks a little darker brown. Do I go get an
IC801 and replace that or do we take more readings? Thanks
C818 = 0.15
ic801
1 8.73
2 -8.73
3 8.94
4 -8.64
5 -8.94
6 8.94
7 -8.84
8 -8.70
9 -8.79
measures 164
do you want me to change IC 801 ?
Do we need any more readings or is that the
final fix? Sorry I'm so dense but I'm a newbee
you know.. Please let me know asap so I can
track down the part. Thanks again.
still don't know what Opps refers to
please respond
oK IT'S BEEN OVER A WEEK...
STILL NO SOLUTION.
×