WP_20191006_23_41_19_Pro.jpg [2.74MB]
WP_20191007_19_02_16_Pro.jpg [1.82MB]
9537_Chassis_SK5.1L-CA_Manual_de_servicio.pdf [6.42mb]
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TVs
Philips 29 "TV with reduced image
hace 5 años
hace 5 años
Well I tell you how it all started.
The tv model: 29PT9467C77 was walking and suddenly turned off and had no red light on.
I checked the source and everything well, then the components around the flyback and found an inductance of 790uH in short and I did it again as with the cable thickness and the same value in henry (I measured it with a inductometer).
I also found an electrolytic capacitor of 4.7uF 50V NP and replace it with two electrolytic capacitors of 10uF 100V in parallel by welding its two positives and leaving its negatives as legs to place on the plate as if it were a capacitor NP of 5uF 100V .
Then I checked the flyback and I was short leg 3 (gnd) with legs 2 (B +), 10 (+180) and 1 (HY), so I went to buy it and they didn't have the same but a replacement, the BSC29-0134Z .
The original was BSC29-0135Z .
Also check the tube plate and everything is fine.
Turn on the TV, adjust the screen and focus, but the surprise is that the image is reduced.
What could be the cause?
WP_20191006_23_41_19_Pro.jpg [2.74MB]
WP_20191007_19_02_16_Pro.jpg [1.82MB]
9537_Chassis_SK5.1L-CA_Manual_de_servicio.pdf [6.42mb]
WP_20191006_23_41_19_Pro.jpg [2.74MB]
WP_20191007_19_02_16_Pro.jpg [1.82MB]
9537_Chassis_SK5.1L-CA_Manual_de_servicio.pdf [6.42mb]
9.501
hace 5 años
hace 5 años
Hello colleague: that usually happens when you change fli-bak or put a replacement q, it is not the original ... in this case measure if the + b is in the 135v q, specify the scheme .... if that Okay try entering the option menu (geometry) and see if you can correct the width from there .... if you can not adjust the width from the geometry option try welding a C of 2200pf x 2kv- polyester for high tension between collector of the output transistor hor, and mass ... if you see results ... if you see q, it widens a lot changes the 2200pf x one of 1500pf x 2kv ... always polyester ... do not put other type of capacitors since q, in the collector or TSH there are voltage peaks of more than 1000v ... comment results ... greetings !!
9.501
hace 5 años
Note: forget to suggest that, check the Q440-R440-C440-T429 -... these components have q, see with the E / W .... or width modulator ... see if they are in good condition and see if this stage works well ... the Q440 is a FET ...
hace 5 años
Watch your "note" late.
Hi Nico.
I measured the voltage of + B and gave 132.3 volts.
Assemble a 1.65nF 2400v capacitor with two 3.3nF 1200v polyester in parallel and place it between mass and collector of the horizontal transistor and it works, but to the right is a little curved the image.
I will pass the capture.
I have to review the components you told me.
Do I have a 2.2nF 2000v ceramic capacitor?
9.501
hace 5 años
of the cerebral type it does not combine to put between the output manifold hor, and mass ... since, it can overheat and shorten ... colleague a 2200pfx2kv polyester capacitor you can get it in any house of sales of spare parts for tv ... it is worth coins ... place one of 2200pfx 2kv polyester and you can perhaps solve the width ... apart according to the scheme the voltage of the + b must be at 135v ... you checked the C621 layers of 100mfx200v .. .and the C625 and C626 of 1000mfx25v ...? .. if you didn't change them change it and see if the + b goes up to 135v ... did you enter service mode or not ...
hace 5 años
C440 had already changed it because it was devalued, it is the monopolar of 4.7uf 50v.
Q440 and R440 had already reviewed them and they are fine.
C621, C625 and C626 had also reviewed them before and they are fine.
T429 does not exist, it is not in the circuit.
I could not enter the Menu (geometry) with the control.
I put a 2.2nF 2000v polyester capacitor in collector and mass of the horizontal transistor as you told me and the screen width has already been resolved.
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