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TVs

RCA TV does not turn on. Please help!

londy_9
hace 5 años
hace 5 años
good I have an RCA TV model MCR36R410 that does not want to turn me on if someone could help me to repair it I want to try it myself because I like electronics and I have some knowledge. The chassis marks that it is a CH-SS 169373 or JUC.820.683 CN12C5 ver 2.0 Micro: CH04T1232 Jungle: LA76818A Memory: Atmel 24C08A Vertical: LA7840 Horizontal: D2102 Octocoupler: HS817C Source transistor: STR-G5653 I hope your help thanks.
neg2013
neg2013
14.048
hace 5 años

Download this service manual, check it, and measure the voltages specified in the source, see how they behave ...
https://www.electronica-pt.com/esquema/tv/rca-schematics/rca-mcr51r410-chassis--cn12c5-34742/

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londy_9
hace 5 años

thank you very much for the diagram some things change is not exact but very similar. I already made the measurements.
First I made them as a tutorial that got the safe way to do it was to disconnect everything and then bypass base and emitter of the horizontal transistor to disable flyback but that way it did not give any voltage all were in 0v and the indicator led off.
Then I proceeded to remove the transistor from the horizontal and interrupted the + B voltage that should reach the flyback and there if I got voltages in the measurements and the indicator LED on.

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victor flores martinez
hace 5 años
hace 5 años
This is the power supply provided by neg2013 measure voltages and comment results
victor flores martinez
hace 5 años

if the voltages appear when removing the TSH, the fault is at this stage .... possible short measurement between TSH pins, if possible, test the flyback

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londy_9
hace 5 años

a slight shriek is always heard on some component near the source.
Here the voltages of the measurements:
VD551: 73V
VD553: 13.8V
VD558: 5.9V
VD554: 7.4V
VD557: 7.8V
8 pin memory: 5.1v
main capacitor: 160.5v
keyboard and remote control sensor: 5.1v
jungle pin 18 rgb vcc: 2.0v
pin 4 vcc of the str-g5653: 15.8v
pin 5 ocp / fb of the str-g5653: 0.3v
pin 2 source of the str-g5653: 0v
in the serigafria of the plate they mark that these volatges must be:
VD551: 130V
VD553: 24V
VD558: 11V
VD554: does not say
VD557: 16V

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victor flores martinez
hace 5 años

check components associated with opto

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londy_9
hace 5 años

I already checked with the multimeter being removed only the TSH in the + B and mass of the flyback gives me continuous as well as others that mark that there should be a voltage. and the TSH does not know how to measure it, but outside it gives continuity between its legs 1 and 3

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londy_9
hace 5 años

hello victor flores martinez could you help me to know which flyback to replace this one that I have bad thanks

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victor flores martinez
hace 5 años

Let's see ... you say that between pin + b of the flyback and mass measures continuity?
It would not be possible since it indicates that you have a voltage of 70v

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londy_9
hace 5 años

correct pin + b of the flyback gives continuity to mass and if it gives 73v but only gives them when I disable or / or isolate the track that comes from the source to that + b in the flyback

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victor flores martinez
hace 5 años

well, now remove the flyback and measure if the short film persists

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londy_9
hace 5 años

yes friend is still short

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victor flores martinez
hace 5 años

Desolder one leg of the associated components until the short is removed

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manolito1386
hace 5 años
hace 5 años
Solve all cold welds, have you done it yet? .........................
londy_9
hace 5 años

thanks you don't have any cold welding

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