Service manuals, schematics, eproms for electrical technicians

DEWO VH 7014 VH 7020 VH 7021 SCH

TV - SERVICE MANUAL
Type: (PDF)
Size
2.2 MB
Page
6
Category
TV
SERVICE MANUAL
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    DEWO VH 7014 7020 7021
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Relevant TV forum topics:
Philips 40PFL7007K/12 does not power on - Chassis QFU1.1E LA
Hi everybody, I have Philips 40PFL7007K/12 on repair. TV does not start up. I have checked the PSU and it seams to be OK. There seam to be problem on the main board. What I have tried… Well, there is +3V3-STANDBY coming from PSU to main board. This feeds up the main processor. This voltage has also been used to switch TV on. I have checked that switching signal from POWER ON button goes back to main board. But I did not check this whole path towards the processor as it is BGA package and it is covered by ceramic cooling plate. And here comes what is not clear to me. 1. How to check if the main processor works? Does it work on the +3V3-STANDBY when TV is is standby mode? 2. Can I somehow check if the PSU is working? May be by activating some pin? 3. I have noticed by measuring (ohm-meter) some capacitors on the main board (in circles on the picture) that there is very low resistance on them (4.5ohms). In the scheme it is shown that these capacitors are on the 1V5 (1.5V) line. Is this OK? Basically it does not give much current as I = 1V5 / 4R5 = 333mAmps. What do you think? Certainly there are low voltage data parts (RAM. Processor …) connected and such resistivity might be correct….?.... What I have also find that this 1V5 is split into 1V5M0 and 1V5M1. See the picture. I have removed the coils and measured resistance. Then 1V5M0 shows about 15ohms and 1V5M1 shows about 6,5ohms. The service manual is on this link: http://elektrotanya.com/philips_ch.qfu1.1e_la.pdf/download.html Thanks Martin
LG 55UH605V féloldalt nincs háttérvilágitás
Sziasztok a félkép sötét kijelző levéve a két ledcsikból csak egy megy teszterrel mindkettő jó.A táppanel EAX66944001 (1.3) leddriver MAP3516 egyikről sem találok sokat a google nem barát.A két fet jónak tünik ha soronként kötöm be,külön külön megy mind a kettő együtt csak az egyik hajlandó müködni.Jó lenne egy rajz a tápról + a driver ic-ről a tovább haladáshoz mivel kishazánkban nem beszerezhető az ic tápot sem találok hozzá bontva.Nem találkozott-e valaki ilyen hibával.
SONY, KV-29LS60K
Sziasztok Bejött ez a SONY KV-29LS60K tipusú készülék. A hiba a következő: Bekapcsolva megy "kb"15-percet,relé kattan 2-villogás a leden. Főkapcsoló ki majd vissza , azonnal indul , de csak 5 percig,harmadszor már csak 1 perc , hibajelzés mindíg 2 villogás.A tunert kocogtatva kontakt hibára lettem figyelmes."tipikus SONY hiba".Emiat letílthat-e a készülék? Mi a 2-es hibakód? "ma egész nap ment hibátlanul a TV" Köszönöm előre is a segítséget!Nem kontakthiba. polonkay
LG 42PC1RR plazma TV gyerek zár. Hogy lehet eltávolítani?
Tisztelt kollégák! Kérlek segítsetek! Egy LG 42PC1RR plazma tv, bekapcsolás után bármely gomb megnyomása után a készüléken azt írja ki németül hogy gyermekzárba van a tv. Távirányítón tudok mindent csinálni, azon kívül hogy a menübe ahogy bemegyek , nem tudok benne lépegetni le fel, csak az első menüpontot tudom elérni. Pedig a le fel gomb működik, mert a csatornát viszi. Előre is köszönöm a segítséget!
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