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JVC AV-21DX3,21FX3 CH CH
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(PDF)
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2.9 MB
2.9 MB
Page
67
67
Category
TV
SERVICE MANUAL
TV
SERVICE MANUAL
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- Also known:
JVC AV-21DX-3 CH AV21DX3 21FX3 AV 21 DX FX 21DX3 AV-21DX3
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Relevant TV forum topics:
JVC AV-21FMG4G Chassis SCW-1362A CRT TV blinks continuously after three failing power on attempts.
According to the customer, the upper portion of the screen started shrinking with horizontal lines, then ended with a single thin horizontal line.
This suspects the vertical drive section to be problematic. No vertical output though vertical in put is OK. After conducting an ESR check for capacitors in the vertical section, C428 (100uF 35V), connecting VCC1 with Pump-up pin # 3 of the IC, it measured 1200pF. It was replaced but still no vertical output. So changed the vertical IC401 (TDA78040), and the output appeared, but still blinks after three failing start-ups. I, m suspecting the corrupt EEPROM data.
CPU: TDA11010H / N1D00
EEPROM: 24C16A
Any one with EEPROM dump for this model or any help please?
According to the customer, the upper portion of the screen started shrinking with horizontal lines, then ended with a single thin horizontal line.
This suspects the vertical drive section to be problematic. No vertical output though vertical in put is OK. After conducting an ESR check for capacitors in the vertical section, C428 (100uF 35V), connecting VCC1 with Pump-up pin # 3 of the IC, it measured 1200pF. It was replaced but still no vertical output. So changed the vertical IC401 (TDA78040), and the output appeared, but still blinks after three failing start-ups. I, m suspecting the corrupt EEPROM data.
CPU: TDA11010H / N1D00
EEPROM: 24C16A
Any one with EEPROM dump for this model or any help please?
Üdv mindenkinek ! A cimben emlitett LCD TV tápját szeretném ellenőrizni main nélkül. Az a gond, hogy nem tudom hogyan inditsam be a tápot MAIN nélkül. A táp egyik csatalakozóján a következő jelzések vannak: A_DIM / NC, BL_ON/OFF, PWM_DIM/A_DIM, NC, MAIN POW, LB_PRO, STB_3,3V , GND, BT32V. A stand by megvan az 3,2V, a másik konektoron is van egy STB_5V ott is megvan a 4,9V. Melyik két láb áthidalásával indulhat be a táp, mert amúgy nincs 12V sem 24V.
Sziasztok!
A tévé, időnként elnémul és néma is marad ki-be kapcsolásig. Csatornaváltáskor leginkább.
Már több helyen olvastam a hibát de a megoldást még nem írták sehol. Volna valami jótanács?
A tévé, időnként elnémul és néma is marad ki-be kapcsolásig. Csatornaváltáskor leginkább.
Már több helyen olvastam a hibát de a megoldást még nem írták sehol. Volna valami jótanács?
Sziasztok,
előzmény itt: http://elektrotanya.com/?q=hu/content/11ak19-taphiba-megoldva
Ma visszahozták, megint nem megy. Szétszed, 5W porcelán az elején szakadt, zárlatot nem találtam. Csere, nem indul, FET zárlatba megy, bizti röpül. Csere P6NK60ZFP-re, elindul. Járatás, FET hűtőborda kellemesen langyos. Összerak, nem indul. Szétszedem, mozgatásra néha indul. Panel kifordít, azótan nem megy, zárlatot és szakadást nem találok. 300 Volt megvan, mozgatásra, már nem reagál, életjelet nem ad, mindent jónak mérek. Most hogyan tovább? Nincs ötletem, alszom rá egyet meg feldobtam itt, hátha reggelre megvilágosodunk.
Köszi,
Tamás
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