 Posted: Sat Sep 30, 2006 12:25 am Post subject: Hitachi INC551 CCFL inverter |
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| Hi All,
I was looking for information on this inverter also. It is used in several types of TFTs: COMPAQ TFT8020, ACER FP855, IBM 9794-AG1, ViewSonic VG181 and VP181. You can get a new one for $100. I had TWO failing inverters in one week and did some reverse engineering. The problem with both of them was the same: the ceramic resonator that drives the CPU was fried. The CPU is IC1 (HD404344). Disconnect the powerplug from the inverter and measure resistance across the oscillator pins (pin 9 and 10 on the CPU), if it's below 600 Kohm, then you have found the problem. I measured about 300 ohm. Replace the oscillator by a new 3pin 4Mhz ceramic resonator. Bye, Wim Huiskamp |
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| Posted: Thu Mar 02, 2006 2:08 am Post subject: power board |
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| anyone willing to sell there power board? email me at [email protected] | |
| Posted: Sat Feb 04, 2006 4:02 am Post subject: Invc551 |
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Please, do you find it ? Or are you still searching ? |
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| Posted: Thu Dec 22, 2005 10:57 pm Post subject: |
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Does anyone have this shematics.. i´m searching for it the hole day  |
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| Posted: Thu Aug 18, 2005 10:30 am Post subject: |
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| Hi,
I have some information regarding your problem, can you mail me on [email protected] |
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| Posted: Fri Jun 24, 2005 5:04 am Post subject: Inverter INVC551 Hitachi in ACER FP855 / COMPAQ TFT8820 |
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| Hi, i'm searching for INVERTER Schematic (HITACHI INVC551) present in ACER FP855 and COMPAQ TFT8820, because i have failure in this backlight card.
This card has a failure watch dog, and as soon has the CCFL has a problem, the inverter stops the backlight, causing very hard to find where the problem comes from. Please help me, i just download the documentations but the inverter is not present inside. I trust in this forum Thanks in advance (Sorry for bad english, i'm french) Olivier |
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