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SONY KDE-37 42XS955 CHASSIS XS2 SM

TV - SERVICE MANUAL
Type: (PDF)
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15.1 MB
Page
153
Category
TV
SERVICE MANUAL
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    SONY KDE-37 XS-2 KDE37 42XS955 CHASSIS XS2 KDE 37 42 XS 955
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Relevant TV forum topics:
Sony KV-21T1D chassis BE-4A táp
Sziasztok. Egy ilyen táppal küzdök. Tünetek: Bekapcsolás után felszisszen, aztán a tápled elkezd villogni. 6 rövid, szünet. A service manual (30.old) alapján ez overvoltage/overcurrent protection. TápIC: STRS5706. Feltöltöttem a táprajzot és a service manualt is. Az itt leírtak alapján IC csere, esetleg LOPTx csere. Amit eddig elkövettem/tapasztaltam: C608 10µ 50 cserélve (igaz nem low esr-re, mert nem találtam itthon) C620 100µ 160v cserélve 60W-os izzóval nem indul. 40W-ossal második ciccenésre indul és 137V van a B+ -on. Az R607-en 45,3mV van. A Sens bemeneten 32V-ot mérek. Szerintetek? Vegyem az IC-t? Sanyika
Sony KDL -40R471A LCD TV nincs kep, csak hattervilagitas
Sziasztok
40 collos 7 eves Sony TV, ugy kerult hozzam, hogy bekapcsol, de nincs semmi a kepernyon, csak hattervilagitas van.
A tapok rendben vannak (12V, 3.3V), de a T-CON lapon semmilyen feszultseget nem tudtam merni.
Talaltam egy 8 labas SMD IC-t amelyik  a T-CON feszultseget kellene kapcsolja:
APL3546A (Power -Distribution Switches with Soft Start)
Ez az 1 labon megkapja a 12V-ot, a 2 lab (Soft start) 4.13V-on van es a 6 lab (Enable) 3.2V
Szerintem ez igy at kene engedje a 12V-ot, de a kimeneten, 8 lab, 0V van.
Sajnos nincs jelenleg ilyen keznel, de szerintetek is ez rossz, vagy keresgeljek tovabb? A kimeneten nem tudok zarlatot vagy nagy fogyasztot merni, es amugy is a T-COn egy biztositekon keresztul kapja a 12V-ot innen, es a biztositek jo,.
Csatolom az IC adatlapjat. Esetleg ha valaki tudna segiteni rajzzal, megkoszonnem, sajnos en nem talaltam.
Azonkivul minden velemenyt szivesen fogadok.

Minden jot,
Janos
 
-SOLVED- SONY KDL-32EX600 red led 2 flashing - negative 120V backlight missing PSU GE3D APS-272
Hello
I have on my table this sony kdl32ex600 with backlight issue. It's a common failure of this psu but i do not find any part faulted on this board.
The schematic it is almost the same, with minor differences with GE3B found at page 56 on this service manual:
https://elektrotanya.com/sony_kdl-32ex600_kdl-40ex600_kdl46ex600_chassis_az1-k.pdf/download.html
Uploaded only the page 56 from this sm to easing the search.
The red led it's flashing 2 times, meaning psu faulty. Indeed the led backlight does not light.
With the PSU outside of the tv, just with one resistance of 180ohm between standby ( pin 1 3,3V on connector CN6150 ) i get this values
on in:
starting with pin 1

1  +3,3V ST-BY
2  +3,3V AC_OFF_DET
3  +3,3V POWER_ON (with resistance 180ohm between pin1 and pin 3)
4  +12,56V AUDIO_12V
5  0V AUDIO_12V_GND
6  0V REG_12V_GND
7  0V REG_12V_GND
8  +12,6V REG_12V
9  +12,6V REG_12V
10  +0,1V BL_ERR
11  +3,3V BL_ON
12  0V DIMMER
13  0V DIMMER_DC
14  0V T-CON_Vcc_12V
15  0V T-CON_ON
All measure done at secondary ground point C6800 GND as reference.
Meanwhile, the led connected to CN6800 will remain with no light at all. The CN6800 will deliver positive 91V.
The negative branch will deliver at CN6801 ( both pin1 & 2 ) just -1V.
In the training manual found always in here at
https://elektrotanya.com/sony_kdl-32ex600_40ex600_46ex600_chassis_az1k_training%20manual.pdf/download.html
at page 56 will say "SHORT" at pin 12 DIMMER for testing the PSU, always with pin 3 POWER_ON connected to 3,3V ST-BY - pin1.
If i'll put a 180ohm resistance between GND and pin 12 DIMMER, then the tension on CN6800 will rise to +179V and the negative from the CN6801 will rise to -5V, the backlight led will light very very weak.
All tension from CN6805 will remain the same, except the BL_ERR will rise from +0,1V to +1,1V.
With only power_on pin 3 shorted by 180ohm resistance to the pin 1, i get this weak oscillation at emiter of Q6816 + Q6817

[URL=https://picturepush.com/public/16067400][IMG]https://www1.picturepush.com/photo/a/16067400/640/diverse/Q6816Q6817.jpg[/IMG][/URL]

With pin 12 DIMMER shorted ( always by a 180ohm resistance ) at GND, the oscillation will change from 250khz 1,6vpp to almost 70khz at 0,81Vpp. as below:

[URL=https://picturepush.com/public/16067401][IMG]https://www1.picturepush.com/photo/a/16067401/640/diverse/20181117-175255.jpg[/IMG][/URL]

Already checked the capacitors C6828 / C6830 together with D6805 / D6806.
Also checked the L6800 ( trafo ) and i've get 5,5mH instead of 5mH, i think it's ok.
All fuse checked, ok.
Q6814 and Q6801 tested under mosfet tester, ok.

[url=https://picturepush.com/public/16067402][img=https://www1.picturepush.com/photo/a/16067402/220/16067402.jpg][/url]

IC6800 & IC6801 gave +9V and respectively +2,49V

Already checked various components all over the board, i am out of ideas.

Any idea or help would be apreciated.
 
sony KV25C3 AE4 táp + sorvég tranyó
Üdv Uraim! Sony KV25C3.A szokásos táp baj + sorvég tranyó. A táp megjavítva, 2SC3997 nem volt,- egy bontott AE2F-ből /csöves volt/-kibányásztam egy BU1015-öt!! Hozzám így került és baj nélkül működött, a csövet leszámítva.Gondoltam akkor az ae4 is megy vele. Ment is 5-10 percet, aztán megint táp+ sorvég.Nem melegedet sem a táp sem a sorvég!! Kh-ra gyanakodva megjavítom,átforrasztom a sorvéget és a tápot is,/új BU1015/ tárcsakondik cserélve.Újabb próba ,ugyanaz a hiba.Időközben csak találtam 2sc3997-et, de azzal is így jártam.Lehet hogy a trafó szarakodik- pedig teljesen jól indul- vagy a sormeghajtás? Help!
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