Member Avatar for Matth963

When I try to switch on the phone I get a white screen(back-light on). To switch it off I need to take out the battery. I've found some repair guides saying 'apply this jumper' but I don't know exactly what it is.

I know it's an old phone but I'm just trying to repair it.
Thanks in advance

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  • Latest Post Latest Post by keith8385

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A short, practical summary and safe troubleshooting path for the “white screen (backlight on)” symptom reported by . A white/backlit display usually means the panel’s light source is working but the pixels aren’t being driven (no image data or missing display-driver voltages). Common root causes seen on legacy Nokias are: a bad LCD ribbon/connector, open PCB trace or blown fuse to the display, failed display-driver/T-CON circuitry or VCOM/Gamma rails, or (less commonly) a corrupt firmware/boot stage. A quick battery/charger check can rule out simple power/charging faults as suggested. The official Nokia 6630 service manual contains the disassembly steps, component layouts and schematics needed for board‑level checks: Nokia 6630 service manual (schematics & disassembly).

Recommended diagnostic sequence (safe, lowest-effort first):

  • Basic isolation: remove battery, SIM and memory card; wait 30s and try boot with a known‑good battery (no charger).
  • Visible inspections: follow the service manual to open the phone with ESD precautions and inspect the LCD ribbon and connector for bent pins, corrosion or cracked solder joints; clean contacts with isopropyl and carefully reseat the flex.
  • Voltage/continuity checks: with the phone powered appropriately and following the schematic, confirm continuity from the LCD connector pins to the display driver area and verify expected supply rails are present (logic/panel rails). Missing VCOM/AVDD/VGH/VGL or a blown input fuse commonly produces a white or washed screen. (Community repair packs and schematics for older Nokias reference jumpers for broken traces; see examples of community solutions.) See a general T‑Con/rail explanation for why missing display rails produce a white screen: .

What “apply this jumper” means and a caution: most guides mean “bridge a specific open PCB trace or replace a blown fuse by soldering a very fine wire between two service pads.” That must only be done after confirming the trace is open and the upstream circuitry is healthy—jumping into a shorted line can cause more damage. Micro‑soldering skills, a fine enamelled wire (36–40 AWG), flux, a good microscope and the board schematic are required; otherwise a replacement LCD assembly or donor phone is a safer, faster option. Community repair references that list Nokia 6630 jumper points and layouts can help identify exact pads, but the official service manual should be used to verify any pad-to-pad links before soldering. (Community reference: Nokia schematic packs / jumper lists.)

Given the age of the model, cost/time tradeoffs are normal: replacement LCD assemblies or donor boards are often an economical route if board‑level repair tools and experience are not available.

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Member Avatar for rubberman

It's not worth the trouble to fix. FWIW, I am a senior Nokia systems engineer. You can get a Lumia 900 for about $50 USD these days. I'm using one for my primary phone, and it isn't bad (very good, actually). I also have a Google Nexus One running Gingerbread, a Nokia N8 running Symbian, and a Nokia C3-00 feature phone. The 900 is the best of the lot. I used the Nexus One almost exclusively for 2 years and thought it would be hard to find a better phone, but the Lumia 900 has a lot going for it, including the ability to handle my personal gmail account and contacts lists seamlessly. That was important to me as I have a lot of gmail contact lists for things like the IEEE consulting group that I am an officer (past president) of.

If you want to wait a couple of months, you can get the new Lumia 920 with inductive charging and multi-tasking Windows 8. Unfortunately, the company probably won't be giving me one until sometime next year! :-)

Member Avatar for kevin2s

Now Nokia is looking good

Member Avatar for keith8385

May be because of battery problem or you are trying to switch it on when it is in charging mode.

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