 Posted: Wed Mar 26, 2008 1:04 am Post subject: |
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| I don't know if it's very important (for my problem i mean), but i found in the SSP, a missing smd transistor (7693), which terminated in pin25(=0V) of the μP (7600). It's like removed and not dropped, but i'm not sure... I soldered some dry-joints in the SSP and i saw it.
Sould i continue to search in the SSP or this is a waste of time? I'm not an expert with tv repairs and i need some help here, please...  |
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| Posted: Mon Mar 24, 2008 7:03 pm Post subject: |
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| Thanks for your reply,
Big Capacitor: 375V Next Capacitor: 132V In high-voltage: L1 (VOS): 185V L6 (VFRAME): 20V RGB (if you mean in crt panel): both 210V in collector of transistors... *(measures in scart-mode without scart plug-in, black screen) **For "ghost" colors that i said earlier, it's more than a blur (no focus) rainbow, which is all over the screen, with picture of channel very very blur (hard-visible to see). Sorry for my poor english, i don't know how to explain better. |
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| Posted: Mon Mar 24, 2008 11:53 am Post subject: |
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| do you check voltage on suply and RGB | |
| Posted: Sat Mar 22, 2008 3:33 pm Post subject: Philips 28pt4503/15 (MD1.2E AA) Help! |
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| Hello again,
I replaced BF819 and BU1506DX with BU1508DX, but nothing... What else should i check? In the store told me that maybe it's diode problem, but where... in the high-voltage or in the power supply circuit? |
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| Posted: Fri Mar 21, 2008 1:55 pm Post subject: Philips 28pt4503/15 (MD1.2E AA) Help! |
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| Hello,
First, sorry for my English if i do mistakes from now on... This TV set is not mine, a friend gave to me for free, because he couldn't fix it. He told me that he replaced the original LOT with HR-8116, but with no luck... TV set was at protection mode (hick-up) with led flashing. I opened it and C2433 (1,5nF/2KV) has burnt. I changed it with a 1,5nF/3KV capacitor, soldered some dry-joints in Large Signal Panel and checked some LOT related components (resistors/diodes). Now when turning on, for 5 secs i hear tic-tic sound then i take black picture with some blurry "ghost" colors, but with good sound from channels. The tic-tic sound come from crt panel and i see from back, near G2 pin, a little "lightening". If i adjust the LOT (Focus/Screen), tv screen goes white and flashing quickly, adjust more has result to goes in stand-by and start-up with more tic-tic... I enter in SDM Mode but no led blinking for error codes... I suspect two transistors near C2433 which burnt, T7410 (BF819) and T7421 (BU1506DX). How can i check these with multimeter? Anything else to check it... Thank you for your time, Lefteris, Athens (Greece). |
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