Good day to all!
I got this TV and when I opened it I got the C806 (680uf / 200V) exploded and the IC801 (STR W6357) short (measured outside the board). I proceed to check for other components in short or open (diodes, bridge rectifier, capacitors, resistors) and only found the altered R813 (4.7 ohms), this measured 0.5 Mega ohms, and replaced it. I proceed to place a new capacitor (C806) and remove the IC801, before replacing the IC801 I proceed to measure voltages in the C806 and the tracks where the IC801 goes, getting that in the C806 I have 215Vdc, and in the tracks of the IC801: PIN 1 = 215Vdc (162V diagram) PIN 4 = 90Vdc (10.5V diagram) PIN 5 = 0.7V (0.15 diagram) PIN 6 = varies between 9 and 11 Vdc (3.96 diagram)
Obviously these values are high, but I already reviewed the components of the source and I get nothing else in poor condition, I appreciate the knowledge and guidance you can give me. Thanks in advance.
PS: Thank you. Tell me how the assessments are made to the answers.
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Good day to all!
I got this TV and when I opened it I got the C806 (680uf / 200V) exploded and the IC801 (STR W6357) short (measured outside the board). I proceed to check for other components in short or open (diodes, bridge rectifier, capacitors, resistors) and only found the altered R813 (4.7 ohms), this measured 0.5 Mega ohms, and replaced it. I proceed to place a new capacitor (C806) and remove the IC801, before replacing the IC801 I proceed to measure voltages in the C806 and the tracks where the IC801 goes, getting that in the C806 I have 215Vdc, and in the tracks of the IC801: PIN 1 = 215Vdc (162V diagram) PIN 4 = 90Vdc (10.5V diagram) PIN 5 = 0.7V (0.15 diagram) PIN 6 = varies between 9 and 11 Vdc (3.96 diagram)
Obviously these values are high, but I already reviewed the components of the source and I get nothing else in poor condition, I appreciate the knowledge and guidance you can give me. Thanks in advance.
PS: Thank you. Tell me how the assessments are made to the answers.
RCA Chassis M134C does not turn on (not even the Standby LED)
Televisor RCA M134
Televisor RCA M134
6 Soluciones
14 Reparaciones
hace 5 años
hace 5 años
Good day to all!
I got this TV and when I opened it I got the C806 (680uf / 200V) exploded and the IC801 (STR W6357) short (measured outside the board). I proceed to check for other components in short or open (diodes, bridge rectifier, capacitors, resistors) and only found the altered R813 (4.7 ohms), this measured 0.5 Mega ohms, and replaced it. I proceed to place a new capacitor (C806) and remove the IC801, before replacing the IC801 I proceed to measure voltages in the C806 and the tracks where the IC801 goes, getting that in the C806 I have 215Vdc, and in the tracks of the IC801: PIN 1 = 215Vdc (162V diagram) PIN 4 = 90Vdc (10.5V diagram) PIN 5 = 0.7V (0.15 diagram) PIN 6 = varies between 9 and 11 Vdc (3.96 diagram)
Obviously these values are high, but I already reviewed the components of the source and I get nothing else in poor condition, I appreciate the knowledge and guidance you can give me. Thanks in advance.
PS: Thank you. Tell me how the assessments are made to the answers.
30.814
hace 5 años
Hello Friend. Change the opto coupler and if the tv. It has the TL31. open if the voltage is normalized
30.814
hace 5 años
friend. how long is the + b. Flayback and check the tsh. and check the + b filter.
hace 5 años
Good night Manolo!
I tell you to change the opto and nothing. I have no voltage at + b, the TSH and the + b filter are in good condition.
30.814
hace 5 años
friend does some tests disconnect the ic. of the vertical open if you turn on the TV. if it turns on there is the fault but if it does not turn on you disconnect the ic. audio
hace 5 años
Manolo told you that I have not placed the STR W6357 since the supply voltages are very high, so there are no voltages in the secondary, therefore there is no voltage in the vertical, neither the audio nor the EEPROM. I am trying to normalize the source voltages.
30.814
hace 5 años
friend. before placing the str w6357 check the large filter may be undervalued and check the rectifiers
30.814
hace 5 años
friend. if you have already checked what you want, place the str Try the tv. only connected to the ac network. open how much the + b measures
hace 5 años
Ready friend! It will be tomorrow, here it's almost 12 am Then I tell you what happened. Thanks for the tips and happy evening!
hace 5 años
Good morning Manolo!
I told you to place the STR and it burned again. As I had already mentioned, there are very high supply voltages, for example 90 Vdc in its power PIN 4, where there should be 10.5 Vdc, and 215 Vdc in PIN 1, where there should be 162 Vdc. As the source does not switch, I have no voltage in the secondary part, so I am sure that the problem lies in the source. Now, what could be causing these high values? I comment that raise the leg of the resistance R810 (which is ok) and under the main voltage to 180 Vdc and PIN 4 = 1.2 Vdc
30.814
hace 5 años
friend. you have to do a miniscuous revision, check zener diodes, or you change it and that resistance because there are elements that assimilate sight measure well but in function they change of value do the same with the filters.
30.814
hace 5 años
friend. Remove the tsh. and place a focus on emitter and collector this to ebitar that dry some element as phantom load
hace 5 años
Thank you very much for your advice, I will do it more carefully as you indicate. Well, I won't take you any longer, friend, thanks again and happy weekend!
hace 5 años
The voltage on the raised leg of the R810 is 90 Vdc measured between PIN 3 (GND) of IC801 and the end of the resistance that goes to PIN 4
30.814
hace 5 años
hace 5 años
Hello Friend. Check the source. zener diodes, resistors, small filters change them, after the choper check the filters and diodes, the tsh. and solve the cold welds you see on the plate and if there are bulging filters change them. and check if 5volt goes. to pin 8 of the eprom. Cheers
hace 5 años
Manolo the filter is new, measures 685uf, the bridge rectifier (comes as an integrated) is apparently good, unless it has a leak that is not detected by my multimeter
hace 5 años
Good evening technical friends!
I'm still looking for the solution to my problem, my knowledge in electronics is of an intermediate level, that's why I turn to you who have solid knowledge in the field.
I am still confused with the value of the voltage that goes to PIN 4 (Vcc) of IC801 (STR W6735) which is 90 Vdc, measured between PIN 3 (GND) and PIN 4. * NOTE * voltage measured in pastes without have the STR installed. On the other hand the voltage at C806 raised by 215 Vdc As I told you that when raising the R810 (68K) the voltage in PIN 4 goes to 3 Vdc and the voltage in the C806 to 175 Vdc
hace 5 años
Well, given that no one else could help me with the fault, I will close this question. Thank you very much Manolo for your knowledge and dedication.
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