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Tube TVs
TV sankey sound problem
1.072
hace 5 años
hace 5 años
http://www.archivotecnicosaurios.com/descargas/tv/seccion_ordenada/14228_Chassis_NX56B_Diagrama.pdf
+ B = 105V, the TV turns on and it sounds normal only the R output of the ICAudio of two pins, but after a while it starts to lose sound as it is distorted and it remains that it sounds ugly ..... change filters associated with the R output, the speakers measure well .... I notice how that area warms up, it will be some dry filter since the 12V are in Vcc of the ICAudio .... someone has passed this problem and if the + B is fine in 105V .... the 3-pin L output that horn does not sound .... I am doubting the ICAudio ... some replacement of said integrated
1.072
hace 5 años
I will change the TEA2025B .... look without connecting the horns heats up, even if you connect only one heats up ... they measure and measure 7.2 ohm each ....
1.072
hace 5 años
Look without the speakers the IC does NOT heat up ... but if I connect anybody it gets too hot ... what is the replacement of the TEA2025B
1.072
hace 5 años
Same C620 C618 have printed CY2A 563J .... E CHANGED filters and the voltage without speakers and it already heats up on pin 16 = 11.3V ..15-5.75V..14-11.15V..13y12-0V..11- 0.3V..10-0.02V..9-0V..8-10.44V..7-0.01V..6-0.33V..5y4-0V..3-11.28V..2-5.76V .. 1-0.03V
1.072
hace 5 años
Luis cruzelec responds to give you a solution, since you were the first to say about the capacitors and there was one in short and there I went ...
47.894
hace 5 años
hace 5 años
[i] Let's see, from the data you provide, it is clear that you have an audio signal at the inputs (pins 7 and 10) of this TEA2025B, which we do not know if these 2 signals are "clean" on both channels or perhaps Some already arrive distorted, to get out of doubt you can connect any small amplifier to these 2 pins, by means of a "series" capacitor between 1uF to 10uF / 50V. If the signal is good, you only have to change this TEA2025B.
Now, some equivalent substitutes for this audio amplifier IC are: BT2025BH, KA2206, LA4182 and LA4183.
Regards!
Joansoler. [/I]
1.072
hace 5 años
Q such joansoler ..... the tv works and only the Rout is heard well, but after a while the audio is distorted and the TEA2025B heats up ..... it took off the speakers and stopped heating .... the speakers they are 8 ohm 3W ..... and they measure well ... at the jungle exit I have 3.5V and they reach the pin + of the 1uf / 50V capacitance but in the negative 0V ...
1.072
hace 5 años
I comment that the TEA2025B burst and iso a hole in the center of the integrated, I can not stand more temperature .....
1.072
hace 5 años
hace 5 años
I already repaired the TV ... change of 100u / 16V filters and change of TEA2025B for LA4182, but I had to put an R to lower the supply voltage and look for the ICAudio datashhet and work from 9 to 11V Vcc. ..and these Chinese TVs taba in 13 with load, I already lowered it to 10.8V and it does not heat ...... as I had DC voltage in the speakers one was damaged .... I already stabilized it 0V in each ... ..isto the tv ..... thanks to all
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